/*
* tkCanvLine.c --
*
* This file implements line items for canvas widgets.
*
* Copyright (c) 1991-1994 The Regents of the University of California.
* Copyright (c) 1994-1997 Sun Microsystems, Inc.
* Copyright (c) 1998-1999 by Scriptics Corporation.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* RCS: @(#) $Id: tkCanvLine.c,v 1.13 2003/02/09 07:48:22 hobbs Exp $
*/
#include "tkPort.h"
#include "tkInt.h"
#include "tkCanvases.h"
/*
* The structure below defines the record for each line item.
*/
typedef enum {
ARROWS_NONE, ARROWS_FIRST, ARROWS_LAST, ARROWS_BOTH
} Arrows;
typedef struct LineItem {
Tk_Item header; /* Generic stuff that's the same for all
* types. MUST BE FIRST IN STRUCTURE. */
Tk_Outline outline; /* Outline structure */
Tk_Canvas canvas; /* Canvas containing item. Needed for
* parsing arrow shapes. */
int numPoints; /* Number of points in line (always >= 0). */
double *coordPtr; /* Pointer to malloc-ed array containing
* x- and y-coords of all points in line.
* X-coords are even-valued indices, y-coords
* are corresponding odd-valued indices. If
* the line has arrowheads then the first
* and last points have been adjusted to refer
* to the necks of the arrowheads rather than
* their tips. The actual endpoints are
* stored in the *firstArrowPtr and
* *lastArrowPtr, if they exist. */
int capStyle; /* Cap style for line. */
int joinStyle; /* Join style for line. */
GC arrowGC; /* Graphics context for drawing arrowheads. */
Arrows arrow; /* Indicates whether or not to draw arrowheads:
* "none", "first", "last", or "both". */
float arrowShapeA; /* Distance from tip of arrowhead to center. */
float arrowShapeB; /* Distance from tip of arrowhead to trailing
* point, measured along shaft. */
float arrowShapeC; /* Distance of trailing points from outside
* edge of shaft. */
double *firstArrowPtr; /* Points to array of PTS_IN_ARROW points
* describing polygon for arrowhead at first
* point in line. First point of arrowhead
* is tip. Malloc'ed. NULL means no arrowhead
* at first point. */
double *lastArrowPtr; /* Points to polygon for arrowhead at last
* point in line (PTS_IN_ARROW points, first
* of which is tip). Malloc'ed. NULL means
* no arrowhead at last point. */
Tk_SmoothMethod *smooth; /* Non-zero means draw line smoothed (i.e.
* with Bezier splines). */
int splineSteps; /* Number of steps in each spline segment. */
} LineItem;
/*
* Number of points in an arrowHead:
*/
#define PTS_IN_ARROW 6
/*
* Prototypes for procedures defined in this file:
*/
static int ArrowheadPostscript _ANSI_ARGS_((Tcl_Interp *interp,
Tk_Canvas canvas, LineItem *linePtr,
double *arrowPtr));
static void ComputeLineBbox _ANSI_ARGS_((Tk_Canvas canvas,
LineItem *linePtr));
static int ConfigureLine _ANSI_ARGS_((Tcl_Interp *interp,
Tk_Canvas canvas, Tk_Item *itemPtr, int objc,
Tcl_Obj *CONST objv[], int flags));
static int ConfigureArrows _ANSI_ARGS_((Tk_Canvas canvas,
LineItem *linePtr));
static int CreateLine _ANSI_ARGS_((Tcl_Interp *interp,
Tk_Canvas canvas, struct Tk_Item *itemPtr,
int objc, Tcl_Obj *CONST objv[]));
static void DeleteLine _ANSI_ARGS_((Tk_Canvas canvas,
Tk_Item *itemPtr, Display *display));
static void DisplayLine _ANSI_ARGS_((Tk_Canvas canvas,
Tk_Item *itemPtr, Display *display, Drawable dst,
int x, int y, int width, int height));
static int GetLineIndex _ANSI_ARGS_((Tcl_Interp *interp,
Tk_Canvas canvas, Tk_Item *itemPtr,
Tcl_Obj *obj, int *indexPtr));
static int LineCoords _ANSI_ARGS_((Tcl_Interp *interp,
Tk_Canvas canvas, Tk_Item *itemPtr,
int objc, Tcl_Obj *CONST objv[]));
static void LineDeleteCoords _ANSI_ARGS_((Tk_Canvas canvas,
Tk_Item *itemPtr, int first, int last));
static void LineInsert _ANSI_ARGS_((Tk_Canvas canvas,
Tk_Item *itemPtr, int beforeThis, Tcl_Obj *obj));
static int LineToArea _ANSI_ARGS_((Tk_Canvas canvas,
Tk_Item *itemPtr, double *rectPtr));
static double LineToPoint _ANSI_ARGS_((Tk_Canvas canvas,
Tk_Item *itemPtr, double *coordPtr));
static int LineToPostscript _ANSI_ARGS_((Tcl_Interp *interp,
Tk_Canvas canvas, Tk_Item *itemPtr, int prepass));
static int ArrowParseProc _ANSI_ARGS_((ClientData clientData,
Tcl_Interp *interp, Tk_Window tkwin,
Tcl_Obj * value, char *recordPtr, int offset));
static Tcl_Obj * ArrowPrintProc _ANSI_ARGS_((ClientData clientData,
Tk_Window tkwin, char *recordPtr, int offset,
Tcl_FreeProc **freeProcPtr));
static int ParseArrowShape _ANSI_ARGS_((ClientData clientData,
Tcl_Interp *interp, Tk_Window tkwin,
Tcl_Obj * value, char *recordPtr, int offset));
static Tcl_Obj * PrintArrowShape _ANSI_ARGS_((ClientData clientData,
Tk_Window tkwin, char *recordPtr, int offset,
Tcl_FreeProc **freeProcPtr));
static void ScaleLine _ANSI_ARGS_((Tk_Canvas canvas,
Tk_Item *itemPtr, double originX, double originY,
double scaleX, double scaleY));
static void TranslateLine _ANSI_ARGS_((Tk_Canvas canvas,
Tk_Item *itemPtr, double deltaX, double deltaY));
/*
* Information used for parsing configuration specs. If you change any
* of the default strings, be sure to change the corresponding default
* values in CreateLine.
*/
static Tk_CustomOption arrowShapeOption = {
ParseArrowShape,
PrintArrowShape, (ClientData) NULL
};
static Tk_CustomOption arrowOption = {
ArrowParseProc,
ArrowPrintProc, (ClientData) NULL
};
static Tk_CustomOption smoothOption = {
TkSmoothParseProc,
TkSmoothPrintProc, (ClientData) NULL
};
static Tk_CustomOption stateOption = {
TkStateParseProc,
TkStatePrintProc, (ClientData) 2
};
static Tk_CustomOption tagsOption = {
Tk_CanvasTagsParseProc,
Tk_CanvasTagsPrintProc, (ClientData) NULL
};
static Tk_CustomOption dashOption = {
TkCanvasDashParseProc,
TkCanvasDashPrintProc, (ClientData) NULL
};
static Tk_CustomOption tileOption = {
Tk_TileParseProc,
Tk_TilePrintProc, (ClientData) NULL
};
static Tk_CustomOption offsetOption = {
Tk_OffsetParseProc,
Tk_OffsetPrintProc,
(ClientData) (TK_OFFSET_RELATIVE|TK_OFFSET_INDEX)
};
static Tk_CustomOption pixelOption = {
Tk_PixelParseProc,
Tk_PixelPrintProc, (ClientData) NULL
};
static Tk_ConfigSpec configSpecs[] = {
{TK_CONFIG_CUSTOM, "-activedash", (char *) NULL, (char *) NULL,
(char *) NULL, Tk_Offset(LineItem, outline.activeDash),
TK_CONFIG_NULL_OK, &dashOption},
{TK_CONFIG_COLOR, "-activefill", (char *) NULL, (char *) NULL,
(char *) NULL, Tk_Offset(LineItem, outline.activeColor),
TK_CONFIG_NULL_OK},
{TK_CONFIG_BITMAP, "-activestipple", (char *) NULL, (char *) NULL,
(char *) NULL, Tk_Offset(LineItem, outline.activeStipple),
TK_CONFIG_NULL_OK},
{TK_CONFIG_CUSTOM, "-activewidth", (char *) NULL, (char *) NULL,
"0.0", Tk_Offset(LineItem, outline.activeWidth),
TK_CONFIG_DONT_SET_DEFAULT, &pixelOption},
{TK_CONFIG_CUSTOM, "-arrow", (char *) NULL, (char *) NULL,
"none", Tk_Offset(LineItem, arrow), TK_CONFIG_DONT_SET_DEFAULT, &arrowOption},
{TK_CONFIG_CUSTOM, "-arrowshape", (char *) NULL, (char *) NULL,
"8 10 3", Tk_Offset(LineItem, arrowShapeA),
TK_CONFIG_DONT_SET_DEFAULT, &arrowShapeOption},
{TK_CONFIG_CAP_STYLE, "-capstyle", (char *) NULL, (char *) NULL,
"butt", Tk_Offset(LineItem, capStyle), TK_CONFIG_DONT_SET_DEFAULT},
{TK_CONFIG_COLOR, "-fill", (char *) NULL, (char *) NULL,
"black", Tk_Offset(LineItem, outline.color), TK_CONFIG_NULL_OK},
{TK_CONFIG_CUSTOM, "-dash", (char *) NULL, (char *) NULL,
(char *) NULL, Tk_Offset(LineItem, outline.dash),
TK_CONFIG_NULL_OK, &dashOption},
{TK_CONFIG_PIXELS, "-dashoffset", (char *) NULL, (char *) NULL,
"0", Tk_Offset(LineItem, outline.offset),
TK_CONFIG_DONT_SET_DEFAULT},
{TK_CONFIG_CUSTOM, "-disableddash", (char *) NULL, (char *) NULL,
(char *) NULL, Tk_Offset(LineItem, outline.disabledDash),
TK_CONFIG_NULL_OK, &dashOption},
{TK_CONFIG_COLOR, "-disabledfill", (char *) NULL, (char *) NULL,
(char *) NULL, Tk_Offset(LineItem, outline.disabledColor),
TK_CONFIG_NULL_OK},
{TK_CONFIG_BITMAP, "-disabledstipple", (char *) NULL, (char *) NULL,
(char *) NULL, Tk_Offset(LineItem, outline.disabledStipple),
TK_CONFIG_NULL_OK},
{TK_CONFIG_CUSTOM, "-disabledwidth", (char *) NULL, (char *) NULL,
"0.0", Tk_Offset(LineItem, outline.disabledWidth),
TK_CONFIG_DONT_SET_DEFAULT, &pixelOption},
{TK_CONFIG_JOIN_STYLE, "-joinstyle", (char *) NULL, (char *) NULL,
"round", Tk_Offset(LineItem, joinStyle), TK_CONFIG_DONT_SET_DEFAULT},
{TK_CONFIG_CUSTOM, "-offset", (char *) NULL, (char *) NULL,
"0 0", Tk_Offset(LineItem, outline.tsoffset),
TK_CONFIG_DONT_SET_DEFAULT, &offsetOption},
{TK_CONFIG_CUSTOM, "-smooth", (char *) NULL, (char *) NULL,
"0", Tk_Offset(LineItem, smooth),
TK_CONFIG_DONT_SET_DEFAULT, &smoothOption},
{TK_CONFIG_INT, "-splinesteps", (char *) NULL, (char *) NULL,
"12", Tk_Offset(LineItem, splineSteps), TK_CONFIG_DONT_SET_DEFAULT},
{TK_CONFIG_CUSTOM, "-state", (char *) NULL, (char *) NULL,
(char *) NULL, Tk_Offset(Tk_Item, state), TK_CONFIG_NULL_OK,
&stateOption},
{TK_CONFIG_BITMAP, "-stipple", (char *) NULL, (char *) NULL,
(char *) NULL, Tk_Offset(LineItem, outline.stipple),
TK_CONFIG_NULL_OK},
{TK_CONFIG_CUSTOM, "-tags", (char *) NULL, (char *) NULL,
(char *) NULL, 0, TK_CONFIG_NULL_OK, &tagsOption},
{TK_CONFIG_CUSTOM, "-width", (char *) NULL, (char *) NULL,
"1.0", Tk_Offset(LineItem, outline.width),
TK_CONFIG_DONT_SET_DEFAULT, &pixelOption},
{TK_CONFIG_CALLBACK, "-updatecommand", (char *) NULL, (char *) NULL,
(char *) NULL, Tk_Offset(Tk_Item, updateCmd), TK_CONFIG_NULL_OK},
{TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,
(char *) NULL, 0, 0}
};
/*
* The structures below defines the line item type by means
* of procedures that can be invoked by generic item code.
*/
Tk_ItemType tkLineType = {
"line", /* name */
sizeof(LineItem), /* itemSize */
CreateLine, /* createProc */
configSpecs, /* configSpecs */
ConfigureLine, /* configureProc */
LineCoords, /* coordProc */
DeleteLine, /* deleteProc */
DisplayLine, /* displayProc */
TK_CONFIG_OBJS, /* flags */
LineToPoint, /* pointProc */
LineToArea, /* areaProc */
LineToPostscript, /* postscriptProc */
ScaleLine, /* scaleProc */
TranslateLine, /* translateProc */
GetLineIndex, /* indexProc */
(Tk_ItemCursorProc *) NULL, /* icursorProc */
(Tk_ItemSelectionProc *) NULL, /* selectionProc */
LineInsert, /* insertProc */
LineDeleteCoords, /* dTextProc */
(Tk_ItemType *) NULL, /* nextPtr */
(Tk_ItemBboxProc *) ComputeLineBbox,/* bboxProc */
Tk_Offset(Tk_VisitorType, visitLine), /* acceptProc */
NULL, /* getCoordProc */
NULL /* setCoordProc */
};
/*
* The definition below determines how large are static arrays
* used to hold spline points (splines larger than this have to
* have their arrays malloc-ed).
*/
#define MAX_STATIC_POINTS 200
/*
*--------------------------------------------------------------
*
* CreateLine --
*
* This procedure is invoked to create a new line item in
* a canvas.
*
* Results:
* A standard Tcl return value. If an error occurred in
* creating the item, then an error message is left in
* the interp's result; in this case itemPtr is left uninitialized,
* so it can be safely freed by the caller.
*
* Side effects:
* A new line item is created.
*
*--------------------------------------------------------------
*/
static int
CreateLine(interp, canvas, itemPtr, objc, objv)
Tcl_Interp *interp; /* Interpreter for error reporting. */
Tk_Canvas canvas; /* Canvas to hold new item. */
Tk_Item *itemPtr; /* Record to hold new item; header
* has been initialized by caller. */
int objc; /* Number of arguments in objv. */
Tcl_Obj *CONST objv[]; /* Arguments describing line. */
{
LineItem *linePtr = (LineItem *) itemPtr;
int i;
if (objc == 0) {
panic("canvas did not pass any coords\n");
}
/*
* Carry out initialization that is needed to set defaults and to
* allow proper cleanup after errors during the the remainder of
* this procedure.
*/
Tk_CreateOutline(&(linePtr->outline));
linePtr->canvas = canvas;
linePtr->numPoints = 0;
linePtr->coordPtr = NULL;
linePtr->capStyle = CapButt;
linePtr->joinStyle = JoinRound;
linePtr->arrowGC = None;
linePtr->arrow = ARROWS_NONE;
linePtr->arrowShapeA = (float)8.0;
linePtr->arrowShapeB = (float)10.0;
linePtr->arrowShapeC = (float)3.0;
linePtr->firstArrowPtr = NULL;
linePtr->lastArrowPtr = NULL;
linePtr->smooth = (Tk_SmoothMethod *) NULL;
linePtr->splineSteps = 12;
/*
* Count the number of points and then parse them into a point
* array. Leading arguments are assumed to be points if they
* start with a digit or a minus sign followed by a digit.
*/
for (i = 1; i < objc; i++) {
char *arg = Tcl_GetString(objv[i]);
if ((arg[0] == '-') && (arg[1] >= 'a') && (arg[1] <= 'z')) {
break;
}
}
if (LineCoords(interp, canvas, itemPtr, i, objv) != TCL_OK) {
goto error;
}
if (ConfigureLine(interp, canvas, itemPtr, objc-i, objv+i, 0) == TCL_OK) {
return TCL_OK;
}
error:
DeleteLine(canvas, itemPtr, Tk_Display(Tk_CanvasTkwin(canvas)));
return TCL_ERROR;
}
/*
*--------------------------------------------------------------
*
* LineCoords --
*
* This procedure is invoked to process the "coords" widget
* command on lines. See the user documentation for details
* on what it does.
*
* Results:
* Returns TCL_OK or TCL_ERROR, and sets the interp's result.
*
* Side effects:
* The coordinates for the given item may be changed.
*
*--------------------------------------------------------------
*/
static int
LineCoords(interp, canvas, itemPtr, objc, objv)
Tcl_Interp *interp; /* Used for error reporting. */
Tk_Canvas canvas; /* Canvas containing item. */
Tk_Item *itemPtr; /* Item whose coordinates are to be
* read or modified. */
int objc; /* Number of coordinates supplied in
* objv. */
Tcl_Obj *CONST objv[]; /* Array of coordinates: x1, y1,
* x2, y2, ... */
{
LineItem *linePtr = (LineItem *) itemPtr;
int i, numPoints;
double *coordPtr;
if (objc == 0) {
int numCoords;
Tcl_Obj *subobj, *obj = Tcl_NewObj();
numCoords = 2*linePtr->numPoints;
if (linePtr->firstArrowPtr != NULL) {
coordPtr = linePtr->firstArrowPtr;
} else {
coordPtr = linePtr->coordPtr;
}
for (i = 0; i < numCoords; i++, coordPtr++) {
if (i == 2) {
coordPtr = linePtr->coordPtr+2;
}
if ((linePtr->lastArrowPtr != NULL) && (i == (numCoords-2))) {
coordPtr = linePtr->lastArrowPtr;
}
subobj = Tcl_NewDoubleObj(*coordPtr);
Tcl_ListObjAppendElement(interp, obj, subobj);
}
Tcl_SetObjResult(interp, obj);
return TCL_OK;
}
if (objc == 1) {
if (Tcl_ListObjGetElements(interp, objv[0], &objc,
(Tcl_Obj ***) &objv) != TCL_OK) {
return TCL_ERROR;
}
}
if (objc & 1) {
char buf[64 + TCL_INTEGER_SPACE];
sprintf(buf, "wrong # coordinates: expected an even number, got %d",
objc);
Tcl_SetResult(interp, buf, TCL_VOLATILE);
return TCL_ERROR;
} else if (objc < 4) {
char buf[64 + TCL_INTEGER_SPACE];
sprintf(buf, "wrong # coordinates: expected at least 4, got %d", objc);
Tcl_SetResult(interp, buf, TCL_VOLATILE);
return TCL_ERROR;
} else {
numPoints = objc/2;
if (linePtr->numPoints != numPoints) {
coordPtr = (double *) ckalloc((unsigned)
(sizeof(double) * objc));
if (linePtr->coordPtr != NULL) {
ckfree((char *) linePtr->coordPtr);
}
linePtr->coordPtr = coordPtr;
linePtr->numPoints = numPoints;
}
coordPtr = linePtr->coordPtr;
for (i = 0; i <objc; i++) {
if (Tk_CanvasGetCoordFromObj(interp, canvas, objv[i],
coordPtr++) != TCL_OK) {
return TCL_ERROR;
}
}
/*
* Update arrowheads by throwing away any existing arrow-head
* information and calling ConfigureArrows to recompute it.
*/
if (linePtr->firstArrowPtr != NULL) {
ckfree((char *) linePtr->firstArrowPtr);
linePtr->firstArrowPtr = NULL;
}
if (linePtr->lastArrowPtr != NULL) {
ckfree((char *) linePtr->lastArrowPtr);
linePtr->lastArrowPtr = NULL;
}
if (linePtr->arrow != ARROWS_NONE) {
ConfigureArrows(canvas, linePtr);
}
ComputeLineBbox(canvas, linePtr);
}
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* ConfigureLine --
*
* This procedure is invoked to configure various aspects
* of a line item such as its background color.
*
* Results:
* A standard Tcl result code. If an error occurs, then
* an error message is left in the interp's result.
*
* Side effects:
* Configuration information, such as colors and stipple
* patterns, may be set for itemPtr.
*
*--------------------------------------------------------------
*/
static int
ConfigureLine(interp, canvas, itemPtr, objc, objv, flags)
Tcl_Interp *interp; /* Used for error reporting. */
Tk_Canvas canvas; /* Canvas containing itemPtr. */
Tk_Item *itemPtr; /* Line item to reconfigure. */
int objc; /* Number of elements in objv. */
Tcl_Obj *CONST objv[]; /* Arguments describing things to configure. */
int flags; /* Flags to pass to Tk_ConfigureWidget. */
{
LineItem *linePtr = (LineItem *) itemPtr;
XGCValues gcValues;
GC newGC, arrowGC;
unsigned long mask;
Tk_Window tkwin;
Tk_State state;
tkwin = Tk_CanvasTkwin(canvas);
if (TCL_OK != Tk_ConfigureWidget(interp, tkwin, configSpecs, objc,
objv, (char *) linePtr, flags|TK_CONFIG_OBJS)) {
return TCL_ERROR;
}
/*
* A few of the options require additional processing, such as
* graphics contexts.
*/
state = Tk_GetItemState(canvas, itemPtr);
if (linePtr->outline.activeWidth > linePtr->outline.width ||
linePtr->outline.activeDash.number != 0 ||
linePtr->outline.activeColor != NULL ||
linePtr->outline.activeStipple != None) {
itemPtr->redraw_flags |= TK_ITEM_STATE_DEPENDANT;
} else {
itemPtr->redraw_flags &= ~TK_ITEM_STATE_DEPENDANT;
}
mask = Tk_ConfigOutlineGC(&gcValues, canvas, itemPtr,
&(linePtr->outline));
if (mask) {
if (linePtr->arrow == ARROWS_NONE) {
gcValues.cap_style = linePtr->capStyle;
mask |= GCCapStyle;
}
gcValues.join_style = linePtr->joinStyle;
mask |= GCJoinStyle;
newGC = Tk_GetGC(tkwin, mask, &gcValues);
gcValues.line_width = 0;
arrowGC = Tk_GetGC(tkwin, mask, &gcValues);
} else {
newGC = arrowGC = None;
}
if (linePtr->outline.gc != None) {
Tk_FreeGC(Tk_Display(tkwin), linePtr->outline.gc);
}
if (linePtr->arrowGC != None) {
Tk_FreeGC(Tk_Display(tkwin), linePtr->arrowGC);
}
linePtr->outline.gc = newGC;
linePtr->arrowGC = arrowGC;
/*
* Keep spline parameters within reasonable limits.
*/
if (linePtr->splineSteps < 1) {
linePtr->splineSteps = 1;
} else if (linePtr->splineSteps > 100) {
linePtr->splineSteps = 100;
}
if ((!linePtr->numPoints) || (state==TK_STATE_HIDDEN)) {
ComputeLineBbox(canvas, linePtr);
return TCL_OK;
}
/*
* Setup arrowheads, if needed. If arrowheads are turned off,
* restore the line's endpoints (they were shortened when the
* arrowheads were added).
*/
if ((linePtr->firstArrowPtr != NULL) && (linePtr->arrow != ARROWS_FIRST)
&& (linePtr->arrow != ARROWS_BOTH)) {
linePtr->coordPtr[0] = linePtr->firstArrowPtr[0];
linePtr->coordPtr[1] = linePtr->firstArrowPtr[1];
ckfree((char *) linePtr->firstArrowPtr);
linePtr->firstArrowPtr = NULL;
}
if ((linePtr->lastArrowPtr != NULL) && (linePtr->arrow != ARROWS_LAST)
&& (linePtr->arrow != ARROWS_BOTH)) {
int i;
i = 2*(linePtr->numPoints-1);
linePtr->coordPtr[i] = linePtr->lastArrowPtr[0];
linePtr->coordPtr[i+1] = linePtr->lastArrowPtr[1];
ckfree((char *) linePtr->lastArrowPtr);
linePtr->lastArrowPtr = NULL;
}
if (linePtr->arrow != ARROWS_NONE) {
ConfigureArrows(canvas, linePtr);
}
/*
* Recompute bounding box for line.
*/
ComputeLineBbox(canvas, linePtr);
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* DeleteLine --
*
* This procedure is called to clean up the data structure
* associated with a line item.
*
* Results:
* None.
*
* Side effects:
* Resources associated with itemPtr are released.
*
*--------------------------------------------------------------
*/
static void
DeleteLine(canvas, itemPtr, display)
Tk_Canvas canvas; /* Info about overall canvas widget. */
Tk_Item *itemPtr; /* Item that is being deleted. */
Display *display; /* Display containing window for
* canvas. */
{
LineItem *linePtr = (LineItem *) itemPtr;
Tk_DeleteOutline(display, &(linePtr->outline));
if (linePtr->coordPtr != NULL) {
ckfree((char *) linePtr->coordPtr);
}
if (linePtr->arrowGC != None) {
Tk_FreeGC(display, linePtr->arrowGC);
}
if (linePtr->firstArrowPtr != NULL) {
ckfree((char *) linePtr->firstArrowPtr);
}
if (linePtr->lastArrowPtr != NULL) {
ckfree((char *) linePtr->lastArrowPtr);
}
}
/*
*--------------------------------------------------------------
*
* ComputeLineBbox --
*
* This procedure is invoked to compute the bounding box of
* all the pixels that may be drawn as part of a line.
*
* Results:
* None.
*
* Side effects:
* The fields x1, y1, x2, and y2 are updated in the header
* for itemPtr.
*
*--------------------------------------------------------------
*/
static void
ComputeLineBbox(canvas, linePtr)
Tk_Canvas canvas; /* Canvas that contains item. */
LineItem *linePtr; /* Item whose bbos is to be
* recomputed. */
{
double *coordPtr;
int i, intWidth;
double width;
Tk_State state = Tk_GetItemState(canvas, &linePtr->header);
Tk_TSOffset *tsoffset;
if (!(linePtr->numPoints) || (state==TK_STATE_HIDDEN)) {
linePtr->header.x1 = -1;
linePtr->header.x2 = -1;
linePtr->header.y1 = -1;
linePtr->header.y2 = -1;
return;
}
width = linePtr->outline.width;
if (((TkCanvas *)canvas)->currentItemPtr == (Tk_Item *)linePtr) {
if (linePtr->outline.activeWidth>width) {
width = linePtr->outline.activeWidth;
}
} else if (state==TK_STATE_DISABLED) {
if (linePtr->outline.disabledWidth>0) {
width = linePtr->outline.disabledWidth;
}
}
coordPtr = linePtr->coordPtr;
linePtr->header.x1 = linePtr->header.x2 = (int) *coordPtr;
linePtr->header.y1 = linePtr->header.y2 = (int) coordPtr[1];
/*
* Compute the bounding box of all the points in the line,
* then expand in all directions by the line's width to take
* care of butting or rounded corners and projecting or
* rounded caps. This expansion is an overestimate (worst-case
* is square root of two over two) but it's simple. Don't do
* anything special for curves. This causes an additional
* overestimate in the bounding box, but is faster.
*/
for (i = 1, coordPtr = linePtr->coordPtr+2; i < linePtr->numPoints;
i++, coordPtr += 2) {
TkIncludePoint((Tk_Item *) linePtr, coordPtr);
}
width = linePtr->outline.width;
if (width < 1.0) {
width = 1.0;
}
if (linePtr->arrow != ARROWS_NONE) {
if (linePtr->arrow != ARROWS_LAST) {
TkIncludePoint((Tk_Item *) linePtr, linePtr->firstArrowPtr);
}
if (linePtr->arrow != ARROWS_FIRST) {
TkIncludePoint((Tk_Item *) linePtr, linePtr->lastArrowPtr);
}
}
tsoffset = &linePtr->outline.tsoffset;
if (tsoffset->flags & TK_OFFSET_INDEX) {
double *coordPtr = linePtr->coordPtr + (tsoffset->flags & ~TK_OFFSET_INDEX);
if (tsoffset->flags <= 0) {
coordPtr = linePtr->coordPtr;
if ((linePtr->arrow == ARROWS_FIRST) || (linePtr->arrow == ARROWS_BOTH)) {
coordPtr = linePtr->firstArrowPtr;
}
}
if (tsoffset->flags > (linePtr->numPoints * 2)) {
coordPtr = linePtr->coordPtr + (linePtr->numPoints * 2);
if ((linePtr->arrow == ARROWS_LAST) || (linePtr->arrow == ARROWS_BOTH)) {
coordPtr = linePtr->lastArrowPtr;
}
}
tsoffset->xoffset = (int) (coordPtr[0] + 0.5);
tsoffset->yoffset = (int) (coordPtr[1] + 0.5);
} else {
if (tsoffset->flags & TK_OFFSET_LEFT) {
tsoffset->xoffset = linePtr->header.x1;
} else if (tsoffset->flags & TK_OFFSET_CENTER) {
tsoffset->xoffset = (linePtr->header.x1 + linePtr->header.x2)/2;
} else if (tsoffset->flags & TK_OFFSET_RIGHT) {
tsoffset->xoffset = linePtr->header.x2;
}
if (tsoffset->flags & TK_OFFSET_TOP) {
tsoffset->yoffset = linePtr->header.y1;
} else if (tsoffset->flags & TK_OFFSET_MIDDLE) {
tsoffset->yoffset = (linePtr->header.y1 + linePtr->header.y2)/2;
} else if (tsoffset->flags & TK_OFFSET_BOTTOM) {
tsoffset->yoffset = linePtr->header.y2;
}
}
intWidth = (int) (width + 0.5);
linePtr->header.x1 -= intWidth;
linePtr->header.x2 += intWidth;
linePtr->header.y1 -= intWidth;
linePtr->header.y2 += intWidth;
if (linePtr->numPoints==1) {
linePtr->header.x1 -= 1;
linePtr->header.x2 += 1;
linePtr->header.y1 -= 1;
linePtr->header.y2 += 1;
return;
}
/*
* For mitered lines, make a second pass through all the points.
* Compute the locations of the two miter vertex points and add
* those into the bounding box.
*/
if (linePtr->joinStyle == JoinMiter) {
for (i = linePtr->numPoints, coordPtr = linePtr->coordPtr; i >= 3;
i--, coordPtr += 2) {
double miter[4];
int j;
if (TkGetMiterPoints(coordPtr, coordPtr+2, coordPtr+4,
width, miter, miter+2)) {
for (j = 0; j < 4; j += 2) {
TkIncludePoint((Tk_Item *) linePtr, miter+j);
}
}
}
}
/*
* Add in the sizes of arrowheads, if any.
*/
if (linePtr->arrow != ARROWS_NONE) {
if (linePtr->arrow != ARROWS_LAST) {
for (i = 0, coordPtr = linePtr->firstArrowPtr; i < PTS_IN_ARROW;
i++, coordPtr += 2) {
TkIncludePoint((Tk_Item *) linePtr, coordPtr);
}
}
if (linePtr->arrow != ARROWS_FIRST) {
for (i = 0, coordPtr = linePtr->lastArrowPtr; i < PTS_IN_ARROW;
i++, coordPtr += 2) {
TkIncludePoint((Tk_Item *) linePtr, coordPtr);
}
}
}
/*
* Add one more pixel of fudge factor just to be safe (e.g.
* X may round differently than we do).
*/
linePtr->header.x1 -= 1;
linePtr->header.x2 += 1;
linePtr->header.y1 -= 1;
linePtr->header.y2 += 1;
}
/*
*--------------------------------------------------------------
*
* DisplayLine --
*
* This procedure is invoked to draw a line item in a given
* drawable.
*
* Results:
* None.
*
* Side effects:
* ItemPtr is drawn in drawable using the transformation
* information in canvas.
*
*--------------------------------------------------------------
*/
static void
DisplayLine(canvas, itemPtr, display, drawable, x, y, width, height)
Tk_Canvas canvas; /* Canvas that contains item. */
Tk_Item *itemPtr; /* Item to be displayed. */
Display *display; /* Display on which to draw item. */
Drawable drawable; /* Pixmap or window in which to draw
* item. */
int x, y, width, height; /* Describes region of canvas that
* must be redisplayed (not used). */
{
LineItem *linePtr = (LineItem *) itemPtr;
XPoint staticPoints[MAX_STATIC_POINTS*3];
XPoint *pointPtr;
double linewidth;
int numPoints;
Tk_State state = Tk_GetItemState(canvas, itemPtr);
Pixmap stipple = linePtr->outline.stipple;
if ((!linePtr->numPoints)||(linePtr->outline.gc==None)) {
return;
}
linewidth = linePtr->outline.width;
if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
if (linePtr->outline.activeStipple != None) {
stipple = linePtr->outline.activeStipple;
}
if (linePtr->outline.activeWidth != linewidth) {
linewidth = linePtr->outline.activeWidth;
}
} else if (state==TK_STATE_DISABLED) {
if (linePtr->outline.disabledStipple != None) {
stipple = linePtr->outline.disabledStipple;
}
if (linePtr->outline.disabledWidth != linewidth) {
linewidth = linePtr->outline.disabledWidth;
}
}
/*
* Build up an array of points in screen coordinates. Use a
* static array unless the line has an enormous number of points;
* in this case, dynamically allocate an array. For smoothed lines,
* generate the curve points on each redisplay.
*/
if ((linePtr->smooth) && (linePtr->numPoints > 2)) {
numPoints = linePtr->smooth->coordProc(canvas, (double *) NULL,
linePtr->numPoints, linePtr->splineSteps, (XPoint *) NULL,
(double *) NULL);
} else {
numPoints = linePtr->numPoints;
}
if (numPoints <= MAX_STATIC_POINTS) {
pointPtr = staticPoints;
} else {
pointPtr = (XPoint *)ckalloc((unsigned)(numPoints * 3*sizeof(XPoint)));
}
if ((linePtr->smooth) && (linePtr->numPoints > 2)) {
numPoints = linePtr->smooth->coordProc(canvas, linePtr->coordPtr,
linePtr->numPoints, linePtr->splineSteps, pointPtr,
(double *) NULL);
} else {
numPoints = TkCanvTranslatePath((TkCanvas*)canvas, numPoints,
linePtr->coordPtr, 0, pointPtr);
}
/*
* Display line, the free up line storage if it was dynamically
* allocated. If we're stippling, then modify the stipple offset
* in the GC. Be sure to reset the offset when done, since the
* GC is supposed to be read-only.
*/
if (Tk_ChangeOutlineGC(canvas, itemPtr, &(linePtr->outline))) {
Tk_CanvasSetOffset(canvas, linePtr->arrowGC, &linePtr->outline.tsoffset);
}
if (numPoints>1) {
XDrawLines(display, drawable, linePtr->outline.gc, pointPtr, numPoints,
CoordModeOrigin);
} else {
int intwidth = (int) (linewidth + 0.5);
if (intwidth<1) {
intwidth=1;
}
XFillArc(display, drawable, linePtr->outline.gc,
pointPtr->x - intwidth/2, pointPtr->y - intwidth/2,
(unsigned int)intwidth+1, (unsigned int)intwidth+1, 0, 64*360);
}
if (pointPtr != staticPoints) {
ckfree((char *) pointPtr);
}
/*
* Display arrowheads, if they are wanted.
*/
if (linePtr->firstArrowPtr != NULL) {
TkFillPolygon(canvas, linePtr->firstArrowPtr, PTS_IN_ARROW,
display, drawable, linePtr->arrowGC, NULL);
}
if (linePtr->lastArrowPtr != NULL) {
TkFillPolygon(canvas, linePtr->lastArrowPtr, PTS_IN_ARROW,
display, drawable, linePtr->arrowGC, NULL);
}
if (Tk_ResetOutlineGC(canvas, itemPtr, &(linePtr->outline))) {
XSetTSOrigin(display, linePtr->arrowGC, 0, 0);
}
}
/*
*--------------------------------------------------------------
*
* LineInsert --
*
* Insert coords into a line item at a given index.
*
* Results:
* None.
*
* Side effects:
* The coords in the given item is modified.
*
*--------------------------------------------------------------
*/
static void
LineInsert(canvas, itemPtr, beforeThis, obj)
Tk_Canvas canvas; /* Canvas containing text item. */
Tk_Item *itemPtr; /* Line item to be modified. */
int beforeThis; /* Index before which new coordinates
* are to be inserted. */
Tcl_Obj *obj; /* New coordinates to be inserted. */
{
LineItem *linePtr = (LineItem *) itemPtr;
int length, objc, i;
double *new, *coordPtr;
Tk_State state = Tk_GetItemState(canvas, itemPtr);
Tcl_Obj **objv;
if(state == TK_STATE_NULL) {
state = ((TkCanvas *)canvas)->canvas_state;
}
if (!obj || (Tcl_ListObjGetElements((Tcl_Interp *) NULL, obj, &objc, &objv) != TCL_OK)
|| !objc || objc&1) {
return;
}
length = 2*linePtr->numPoints;
if (beforeThis < 0) {
beforeThis = 0;
}
if (beforeThis > length) {
beforeThis = length;
}
if (linePtr->firstArrowPtr != NULL) {
linePtr->coordPtr[0] = linePtr->firstArrowPtr[0];
linePtr->coordPtr[1] = linePtr->firstArrowPtr[1];
}
if (linePtr->lastArrowPtr != NULL) {
linePtr->coordPtr[length-2] = linePtr->lastArrowPtr[0];
linePtr->coordPtr[length-1] = linePtr->lastArrowPtr[1];
}
new = (double *) ckalloc((unsigned)(sizeof(double) * (length + objc)));
for(i=0; i<beforeThis; i++) {
new[i] = linePtr->coordPtr[i];
}
for(i=0; i<objc; i++) {
if (Tcl_GetDoubleFromObj((Tcl_Interp *) NULL,objv[i],
new+(i+beforeThis))!=TCL_OK) {
Tcl_ResetResult(((TkCanvas *)canvas)->interp);
ckfree((char *) new);
return;
}
}
for(i=beforeThis; i<length; i++) {
new[i+objc] = linePtr->coordPtr[i];
}
if(linePtr->coordPtr) ckfree((char *)linePtr->coordPtr);
linePtr->coordPtr = new;
linePtr->numPoints = (length + objc)/2;
if ((length>3) && (state != TK_STATE_HIDDEN)) {
/*
* This is some optimizing code that will result that only the part
* of the polygon that changed (and the objects that are overlapping
* with that part) need to be redrawn. A special flag is set that
* instructs the general canvas code not to redraw the whole
* object. If this flag is not set, the canvas will do the redrawing,
* otherwise I have to do it here.
*/
itemPtr->redraw_flags |= TK_ITEM_DONT_REDRAW;
if (beforeThis>0) {beforeThis -= 2; objc+=2; }
if ((beforeThis+objc)<length) objc+=2;
if (linePtr->smooth) {
if(beforeThis>0) {
beforeThis-=2; objc+=2;
}
if((beforeThis+objc+2)<length) {
objc+=2;
}
}
itemPtr->x1 = itemPtr->x2 = (int) linePtr->coordPtr[beforeThis];
itemPtr->y1 = itemPtr->y2 = (int) linePtr->coordPtr[beforeThis+1];
if ((linePtr->firstArrowPtr != NULL) && (beforeThis<1)) {
/* include old first arrow */
for (i = 0, coordPtr = linePtr->firstArrowPtr; i < PTS_IN_ARROW;
i++, coordPtr += 2) {
TkIncludePoint(itemPtr, coordPtr);
}
}
if ((linePtr->lastArrowPtr != NULL) && ((beforeThis+objc)>=length)) {
/* include old last arrow */
for (i = 0, coordPtr = linePtr->lastArrowPtr; i < PTS_IN_ARROW;
i++, coordPtr += 2) {
TkIncludePoint(itemPtr, coordPtr);
}
}
coordPtr = linePtr->coordPtr+beforeThis+2;
for(i=2; i<objc; i+=2) {
TkIncludePoint(itemPtr, coordPtr);
coordPtr+=2;
}
}
if (linePtr->firstArrowPtr != NULL) {
ckfree((char *) linePtr->firstArrowPtr);
linePtr->firstArrowPtr = NULL;
}
if (linePtr->lastArrowPtr != NULL) {
ckfree((char *) linePtr->lastArrowPtr);
linePtr->lastArrowPtr = NULL;
}
if (linePtr->arrow != ARROWS_NONE) {
ConfigureArrows(canvas, linePtr);
}
if(itemPtr->redraw_flags & TK_ITEM_DONT_REDRAW) {
double width;
int intWidth;
if ((linePtr->firstArrowPtr != NULL) && (beforeThis>2)) {
/* include new first arrow */
for (i = 0, coordPtr = linePtr->firstArrowPtr; i < PTS_IN_ARROW;
i++, coordPtr += 2) {
TkIncludePoint(itemPtr, coordPtr);
}
}
if ((linePtr->lastArrowPtr != NULL) && ((beforeThis+objc)<(length-2))) {
/* include new right arrow */
for (i = 0, coordPtr = linePtr->lastArrowPtr; i < PTS_IN_ARROW;
i++, coordPtr += 2) {
TkIncludePoint(itemPtr, coordPtr);
}
}
width = linePtr->outline.width;
if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
if (linePtr->outline.activeWidth>width) {
width = linePtr->outline.activeWidth;
}
} else if (state==TK_STATE_DISABLED) {
if (linePtr->outline.disabledWidth>0) {
width = linePtr->outline.disabledWidth;
}
}
intWidth = (int) (width + 0.5);
if (intWidth < 1) {
intWidth = 1;
}
itemPtr->x1 -= intWidth; itemPtr->y1 -= intWidth;
itemPtr->x2 += intWidth; itemPtr->y2 += intWidth;
Tk_CanvasEventuallyRedraw(canvas, itemPtr->x1, itemPtr->y1,
itemPtr->x2, itemPtr->y2);
}
ComputeLineBbox(canvas, linePtr);
}
/*
*--------------------------------------------------------------
*
* LineDeleteCoords --
*
* Delete one or more coordinates from a line item.
*
* Results:
* None.
*
* Side effects:
* Characters between "first" and "last", inclusive, get
* deleted from itemPtr.
*
*--------------------------------------------------------------
*/
static void
LineDeleteCoords(canvas, itemPtr, first, last)
Tk_Canvas canvas; /* Canvas containing itemPtr. */
Tk_Item *itemPtr; /* Item in which to delete characters. */
int first; /* Index of first character to delete. */
int last; /* Index of last character to delete. */
{
LineItem *linePtr = (LineItem *) itemPtr;
int count, i, first1, last1;
int length = 2*linePtr->numPoints;
double *coordPtr;
Tk_State state = Tk_GetItemState(canvas, itemPtr);
first &= -2;
last &= -2;
if (first < 0) {
first = 0;
}
if (last >= length) {
last = length-2;
}
if (first > last) {
return;
}
if (linePtr->firstArrowPtr != NULL) {
linePtr->coordPtr[0] = linePtr->firstArrowPtr[0];
linePtr->coordPtr[1] = linePtr->firstArrowPtr[1];
}
if (linePtr->lastArrowPtr != NULL) {
linePtr->coordPtr[length-2] = linePtr->lastArrowPtr[0];
linePtr->coordPtr[length-1] = linePtr->lastArrowPtr[1];
}
first1 = first; last1 = last;
if(first1>0) first1 -= 2;
if(last1<length-2) last1 += 2;
if (linePtr->smooth) {
if(first1>0) first1 -= 2;
if(last1<length-2) last1 += 2;
}
if((first1<2) && (last1 >= length-2)) {
/*
* This is some optimizing code that will result that only the part
* of the line that changed (and the objects that are overlapping
* with that part) need to be redrawn. A special flag is set that
* instructs the general canvas code not to redraw the whole
* object. If this flag is set, the redrawing has to be done here,
* otherwise the general Canvas code will take care of it.
*/
itemPtr->redraw_flags |= TK_ITEM_DONT_REDRAW;
itemPtr->x1 = itemPtr->x2 = (int) linePtr->coordPtr[first1];
itemPtr->y1 = itemPtr->y2 = (int) linePtr->coordPtr[first1+1];
if ((linePtr->firstArrowPtr != NULL) && (first1<2)) {
/* include old first arrow */
for (i = 0, coordPtr = linePtr->firstArrowPtr; i < PTS_IN_ARROW;
i++, coordPtr += 2) {
TkIncludePoint(itemPtr, coordPtr);
}
}
if ((linePtr->lastArrowPtr != NULL) && (last1>=length-2)) {
/* include old last arrow */
for (i = 0, coordPtr = linePtr->lastArrowPtr; i < PTS_IN_ARROW;
i++, coordPtr += 2) {
TkIncludePoint(itemPtr, coordPtr);
}
}
coordPtr = linePtr->coordPtr+first1+2;
for (i=first1+2; i<=last1; i+=2) {
TkIncludePoint(itemPtr, coordPtr);
coordPtr+=2;
}
}
count = last + 2 - first;
for (i=last+2; i<length; i++) {
linePtr->coordPtr[i-count] = linePtr->coordPtr[i];
}
linePtr->numPoints -= count/2;
if (linePtr->firstArrowPtr != NULL) {
ckfree((char *) linePtr->firstArrowPtr);
linePtr->firstArrowPtr = NULL;
}
if (linePtr->lastArrowPtr != NULL) {
ckfree((char *) linePtr->lastArrowPtr);
linePtr->lastArrowPtr = NULL;
}
if (linePtr->arrow != ARROWS_NONE) {
ConfigureArrows(canvas, linePtr);
}
if(itemPtr->redraw_flags & TK_ITEM_DONT_REDRAW) {
double width;
int intWidth;
if ((linePtr->firstArrowPtr != NULL) && (first1<4)) {
/* include new first arrow */
for (i = 0, coordPtr = linePtr->firstArrowPtr; i < PTS_IN_ARROW;
i++, coordPtr += 2) {
TkIncludePoint(itemPtr, coordPtr);
}
}
if ((linePtr->lastArrowPtr != NULL) && (last1>(length-4))) {
/* include new right arrow */
for (i = 0, coordPtr = linePtr->lastArrowPtr; i < PTS_IN_ARROW;
i++, coordPtr += 2) {
TkIncludePoint(itemPtr, coordPtr);
}
}
width = linePtr->outline.width;
if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
if (linePtr->outline.activeWidth>width) {
width = linePtr->outline.activeWidth;
}
} else if (state==TK_STATE_DISABLED) {
if (linePtr->outline.disabledWidth>0) {
width = linePtr->outline.disabledWidth;
}
}
intWidth = (int) (width + 0.5);
if (intWidth < 1) {
intWidth = 1;
}
itemPtr->x1 -= intWidth; itemPtr->y1 -= intWidth;
itemPtr->x2 += intWidth; itemPtr->y2 += intWidth;
Tk_CanvasEventuallyRedraw(canvas, itemPtr->x1, itemPtr->y1,
itemPtr->x2, itemPtr->y2);
}
ComputeLineBbox(canvas, linePtr);
}
/*
*--------------------------------------------------------------
*
* LineToPoint --
*
* Computes the distance from a given point to a given
* line, in canvas units.
*
* Results:
* The return value is 0 if the point whose x and y coordinates
* are pointPtr[0] and pointPtr[1] is inside the line. If the
* point isn't inside the line then the return value is the
* distance from the point to the line.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
/* ARGSUSED */
static double
LineToPoint(canvas, itemPtr, pointPtr)
Tk_Canvas canvas; /* Canvas containing item. */
Tk_Item *itemPtr; /* Item to check against point. */
double *pointPtr; /* Pointer to x and y coordinates. */
{
Tk_State state = Tk_GetItemState(canvas, itemPtr);
LineItem *linePtr = (LineItem *) itemPtr;
double *coordPtr, *linePoints;
double staticSpace[2*MAX_STATIC_POINTS];
double poly[10];
double bestDist, dist, width;
int numPoints, count;
int changedMiterToBevel; /* Non-zero means that a mitered corner
* had to be treated as beveled after all
* because the angle was < 11 degrees. */
bestDist = 1.0e36;
/*
* Handle smoothed lines by generating an expanded set of points
* against which to do the check.
*/
width = linePtr->outline.width;
if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
if (linePtr->outline.activeWidth>width) {
width = linePtr->outline.activeWidth;
}
} else if (state==TK_STATE_DISABLED) {
if (linePtr->outline.disabledWidth>0) {
width = linePtr->outline.disabledWidth;
}
}
if ((linePtr->smooth) && (linePtr->numPoints > 2)) {
numPoints = linePtr->smooth->coordProc(canvas, (double *) NULL,
linePtr->numPoints, linePtr->splineSteps, (XPoint *) NULL,
(double *) NULL);
if (numPoints <= MAX_STATIC_POINTS) {
linePoints = staticSpace;
} else {
linePoints = (double *) ckalloc((unsigned)
(2*numPoints*sizeof(double)));
}
numPoints = linePtr->smooth->coordProc(canvas, linePtr->coordPtr,
linePtr->numPoints, linePtr->splineSteps, (XPoint *) NULL,
linePoints);
} else {
numPoints = linePtr->numPoints;
linePoints = linePtr->coordPtr;
}
if (width < 1.0) {
width = 1.0;
}
if (!numPoints || itemPtr->state==TK_STATE_HIDDEN) {
return bestDist;
} else if (numPoints == 1) {
bestDist = hypot(linePoints[0] - pointPtr[0], linePoints[1] - pointPtr[1])
- width/2.0;
if (bestDist < 0) bestDist = 0;
return bestDist;
}
/*
* The overall idea is to iterate through all of the edges of
* the line, computing a polygon for each edge and testing the
* point against that polygon. In addition, there are additional
* tests to deal with rounded joints and caps.
*/
changedMiterToBevel = 0;
for (count = numPoints, coordPtr = linePoints; count >= 2;
count--, coordPtr += 2) {
/*
* If rounding is done around the first point then compute
* the distance between the point and the point.
*/
if (((linePtr->capStyle == CapRound) && (count == numPoints))
|| ((linePtr->joinStyle == JoinRound)
&& (count != numPoints))) {
dist = hypot(coordPtr[0] - pointPtr[0], coordPtr[1] - pointPtr[1])
- width/2.0;
if (dist <= 0.0) {
bestDist = 0.0;
goto done;
} else if (dist < bestDist) {
bestDist = dist;
}
}
/*
* Compute the polygonal shape corresponding to this edge,
* consisting of two points for the first point of the edge
* and two points for the last point of the edge.
*/
if (count == numPoints) {
TkGetButtPoints(coordPtr+2, coordPtr, width,
linePtr->capStyle == CapProjecting, poly, poly+2);
} else if ((linePtr->joinStyle == JoinMiter) && !changedMiterToBevel) {
poly[0] = poly[6];
poly[1] = poly[7];
poly[2] = poly[4];
poly[3] = poly[5];
} else {
TkGetButtPoints(coordPtr+2, coordPtr, width, 0,
poly, poly+2);
/*
* If this line uses beveled joints, then check the distance
* to a polygon comprising the last two points of the previous
* polygon and the first two from this polygon; this checks
* the wedges that fill the mitered joint.
*/
if ((linePtr->joinStyle == JoinBevel) || changedMiterToBevel) {
poly[8] = poly[0];
poly[9] = poly[1];
dist = TkPolygonToPoint(poly, 5, pointPtr);
if (dist <= 0.0) {
bestDist = 0.0;
goto done;
} else if (dist < bestDist) {
bestDist = dist;
}
changedMiterToBevel = 0;
}
}
if (count == 2) {
TkGetButtPoints(coordPtr, coordPtr+2, width,
linePtr->capStyle == CapProjecting, poly+4, poly+6);
} else if (linePtr->joinStyle == JoinMiter) {
if (TkGetMiterPoints(coordPtr, coordPtr+2, coordPtr+4,
width, poly+4, poly+6) == 0) {
changedMiterToBevel = 1;
TkGetButtPoints(coordPtr, coordPtr+2, width,
0, poly+4, poly+6);
}
} else {
TkGetButtPoints(coordPtr, coordPtr+2, width, 0,
poly+4, poly+6);
}
poly[8] = poly[0];
poly[9] = poly[1];
dist = TkPolygonToPoint(poly, 5, pointPtr);
if (dist <= 0.0) {
bestDist = 0.0;
goto done;
} else if (dist < bestDist) {
bestDist = dist;
}
}
/*
* If caps are rounded, check the distance to the cap around the
* final end point of the line.
*/
if (linePtr->capStyle == CapRound) {
dist = hypot(coordPtr[0] - pointPtr[0], coordPtr[1] - pointPtr[1])
- width/2.0;
if (dist <= 0.0) {
bestDist = 0.0;
goto done;
} else if (dist < bestDist) {
bestDist = dist;
}
}
/*
* If there are arrowheads, check the distance to the arrowheads.
*/
if (linePtr->arrow != ARROWS_NONE) {
if (linePtr->arrow != ARROWS_LAST) {
dist = TkPolygonToPoint(linePtr->firstArrowPtr, PTS_IN_ARROW,
pointPtr);
if (dist <= 0.0) {
bestDist = 0.0;
goto done;
} else if (dist < bestDist) {
bestDist = dist;
}
}
if (linePtr->arrow != ARROWS_FIRST) {
dist = TkPolygonToPoint(linePtr->lastArrowPtr, PTS_IN_ARROW,
pointPtr);
if (dist <= 0.0) {
bestDist = 0.0;
goto done;
} else if (dist < bestDist) {
bestDist = dist;
}
}
}
done:
if ((linePoints != staticSpace) && (linePoints != linePtr->coordPtr)) {
ckfree((char *) linePoints);
}
return bestDist;
}
/*
*--------------------------------------------------------------
*
* LineToArea --
*
* This procedure is called to determine whether an item
* lies entirely inside, entirely outside, or overlapping
* a given rectangular area.
*
* Results:
* -1 is returned if the item is entirely outside the
* area, 0 if it overlaps, and 1 if it is entirely
* inside the given area.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
/* ARGSUSED */
static int
LineToArea(canvas, itemPtr, rectPtr)
Tk_Canvas canvas; /* Canvas containing item. */
Tk_Item *itemPtr; /* Item to check against line. */
double *rectPtr;
{
LineItem *linePtr = (LineItem *) itemPtr;
double staticSpace[2*MAX_STATIC_POINTS];
double *linePoints;
int numPoints, result;
double radius, width;
Tk_State state = Tk_GetItemState(canvas, itemPtr);
width = linePtr->outline.width;
if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
if (linePtr->outline.activeWidth>width) {
width = linePtr->outline.activeWidth;
}
} else if (state==TK_STATE_DISABLED) {
if (linePtr->outline.disabledWidth>0) {
width = linePtr->outline.disabledWidth;
}
}
radius = (width+1.0)/2.0;
if ((state==TK_STATE_HIDDEN) || !linePtr->numPoints) {
return -1;
} else if (linePtr->numPoints == 1) {
double oval[4];
oval[0] = linePtr->coordPtr[0]-radius;
oval[1] = linePtr->coordPtr[1]-radius;
oval[2] = linePtr->coordPtr[0]+radius;
oval[3] = linePtr->coordPtr[1]+radius;
return TkOvalToArea(oval, rectPtr);
}
/*
* Handle smoothed lines by generating an expanded set of points
* against which to do the check.
*/
if ((linePtr->smooth) && (linePtr->numPoints > 2)) {
numPoints = linePtr->smooth->coordProc(canvas, (double *) NULL,
linePtr->numPoints, linePtr->splineSteps, (XPoint *) NULL,
(double *) NULL);
if (numPoints <= MAX_STATIC_POINTS) {
linePoints = staticSpace;
} else {
linePoints = (double *) ckalloc((unsigned)
(2*numPoints*sizeof(double)));
}
numPoints = linePtr->smooth->coordProc(canvas, linePtr->coordPtr,
linePtr->numPoints, linePtr->splineSteps, (XPoint *) NULL,
linePoints);
} else {
numPoints = linePtr->numPoints;
linePoints = linePtr->coordPtr;
}
/*
* Check the segments of the line.
*/
if (width < 1.0) {
width = 1.0;
}
result = TkThickPolyLineToArea(linePoints, numPoints,
width, linePtr->capStyle, linePtr->joinStyle,
rectPtr);
if (result == 0) {
goto done;
}
/*
* Check arrowheads, if any.
*/
if (linePtr->arrow != ARROWS_NONE) {
if (linePtr->arrow != ARROWS_LAST) {
if (TkPolygonToArea(linePtr->firstArrowPtr, PTS_IN_ARROW,
rectPtr) != result) {
result = 0;
goto done;
}
}
if (linePtr->arrow != ARROWS_FIRST) {
if (TkPolygonToArea(linePtr->lastArrowPtr, PTS_IN_ARROW,
rectPtr) != result) {
result = 0;
goto done;
}
}
}
done:
if ((linePoints != staticSpace) && (linePoints != linePtr->coordPtr)) {
ckfree((char *) linePoints);
}
return result;
}
/*
*--------------------------------------------------------------
*
* ScaleLine --
*
* This procedure is invoked to rescale a line item.
*
* Results:
* None.
*
* Side effects:
* The line referred to by itemPtr is rescaled so that the
* following transformation is applied to all point
* coordinates:
* x' = originX + scaleX*(x-originX)
* y' = originY + scaleY*(y-originY)
*
*--------------------------------------------------------------
*/
static void
ScaleLine(canvas, itemPtr, originX, originY, scaleX, scaleY)
Tk_Canvas canvas; /* Canvas containing line. */
Tk_Item *itemPtr; /* Line to be scaled. */
double originX, originY; /* Origin about which to scale rect. */
double scaleX; /* Amount to scale in X direction. */
double scaleY; /* Amount to scale in Y direction. */
{
LineItem *linePtr = (LineItem *) itemPtr;
double *coordPtr;
int i;
/*
* Delete any arrowheads before scaling all the points (so that
* the end-points of the line get restored).
*/
if (linePtr->firstArrowPtr != NULL) {
linePtr->coordPtr[0] = linePtr->firstArrowPtr[0];
linePtr->coordPtr[1] = linePtr->firstArrowPtr[1];
ckfree((char *) linePtr->firstArrowPtr);
linePtr->firstArrowPtr = NULL;
}
if (linePtr->lastArrowPtr != NULL) {
int i;
i = 2*(linePtr->numPoints-1);
linePtr->coordPtr[i] = linePtr->lastArrowPtr[0];
linePtr->coordPtr[i+1] = linePtr->lastArrowPtr[1];
ckfree((char *) linePtr->lastArrowPtr);
linePtr->lastArrowPtr = NULL;
}
for (i = 0, coordPtr = linePtr->coordPtr; i < linePtr->numPoints;
i++, coordPtr += 2) {
coordPtr[0] = originX + scaleX*(*coordPtr - originX);
coordPtr[1] = originY + scaleY*(coordPtr[1] - originY);
}
if (linePtr->arrow != ARROWS_NONE) {
ConfigureArrows(canvas, linePtr);
}
ComputeLineBbox(canvas, linePtr);
}
/*
*--------------------------------------------------------------
*
* GetLineIndex --
*
* Parse an index into a line item and return either its value
* or an error.
*
* Results:
* A standard Tcl result. If all went well, then *indexPtr is
* filled in with the index (into itemPtr) corresponding to
* string. Otherwise an error message is left in
* interp->result.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
static int
GetLineIndex(interp, canvas, itemPtr, obj, indexPtr)
Tcl_Interp *interp; /* Used for error reporting. */
Tk_Canvas canvas; /* Canvas containing item. */
Tk_Item *itemPtr; /* Item for which the index is being
* specified. */
Tcl_Obj *obj; /* Specification of a particular coord
* in itemPtr's line. */
int *indexPtr; /* Where to store converted index. */
{
LineItem *linePtr = (LineItem *) itemPtr;
int length;
char *string;
int i;
double x ,y, bestDist, dist, *coordPtr;
char *end, *p;
Tcl_Obj **objv;
if (Tcl_ListObjGetElements(interp, obj, &i, &objv) == TCL_OK && i == 2
&& Tcl_GetDoubleFromObj(interp, objv[0], &x) == TCL_OK
&& Tcl_GetDoubleFromObj(interp, objv[1], &y) == TCL_OK) {
goto doxy;
}
string = Tcl_GetStringFromObj(obj, &length);
if (string[0] == 'e') {
if (strncmp(string, "end", length) == 0) {
*indexPtr = 2*linePtr->numPoints;
} else {
badIndex:
/*
* Some of the paths here leave messages in interp->result,
* so we have to clear it out before storing our own message.
*/
Tcl_SetResult(interp, (char *) NULL, TCL_STATIC);
Tcl_AppendResult(interp, "bad index \"", string, "\"",
(char *) NULL);
return TCL_ERROR;
}
} else if (string[0] == '@') {
p = string+1;
x = strtod(p, &end);
if ((end == p) || (*end != ',')) {
goto badIndex;
}
p = end+1;
y = strtod(p, &end);
if ((end == p) || (*end != 0)) {
goto badIndex;
}
doxy:
bestDist = 1.0e36;
coordPtr = linePtr->coordPtr;
*indexPtr = 0;
for(i=0; i<linePtr->numPoints; i++) {
dist = hypot(coordPtr[0] - x, coordPtr[1] - y);
if (dist<bestDist) {
bestDist = dist;
*indexPtr = 2*i;
}
coordPtr += 2;
}
} else {
if (Tcl_GetIntFromObj(interp, obj, indexPtr) != TCL_OK) {
goto badIndex;
}
*indexPtr &= -2; /* if index is odd, make it even */
if (*indexPtr < 0){
*indexPtr = 0;
} else if (*indexPtr > (2*linePtr->numPoints)) {
*indexPtr = (2*linePtr->numPoints);
}
}
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* TranslateLine --
*
* This procedure is called to move a line by a given amount.
*
* Results:
* None.
*
* Side effects:
* The position of the line is offset by (xDelta, yDelta), and
* the bounding box is updated in the generic part of the item
* structure.
*
*--------------------------------------------------------------
*/
static void
TranslateLine(canvas, itemPtr, deltaX, deltaY)
Tk_Canvas canvas; /* Canvas containing item. */
Tk_Item *itemPtr; /* Item that is being moved. */
double deltaX, deltaY; /* Amount by which item is to be
* moved. */
{
LineItem *linePtr = (LineItem *) itemPtr;
double *coordPtr;
int i;
for (i = 0, coordPtr = linePtr->coordPtr; i < linePtr->numPoints;
i++, coordPtr += 2) {
coordPtr[0] += deltaX;
coordPtr[1] += deltaY;
}
if (linePtr->firstArrowPtr != NULL) {
for (i = 0, coordPtr = linePtr->firstArrowPtr; i < PTS_IN_ARROW;
i++, coordPtr += 2) {
coordPtr[0] += deltaX;
coordPtr[1] += deltaY;
}
}
if (linePtr->lastArrowPtr != NULL) {
for (i = 0, coordPtr = linePtr->lastArrowPtr; i < PTS_IN_ARROW;
i++, coordPtr += 2) {
coordPtr[0] += deltaX;
coordPtr[1] += deltaY;
}
}
ComputeLineBbox(canvas, linePtr);
}
/*
*--------------------------------------------------------------
*
* ParseArrowShape --
*
* This procedure is called back during option parsing to
* parse arrow shape information.
*
* Results:
* The return value is a standard Tcl result: TCL_OK means
* that the arrow shape information was parsed ok, and
* TCL_ERROR means it couldn't be parsed.
*
* Side effects:
* Arrow information in recordPtr is updated.
*
*--------------------------------------------------------------
*/
/* ARGSUSED */
static int
ParseArrowShape(clientData, interp, tkwin, value, recordPtr, offset)
ClientData clientData; /* Not used. */
Tcl_Interp *interp; /* Used for error reporting. */
Tk_Window tkwin; /* Not used. */
Tcl_Obj * value; /* Textual specification of arrow shape. */
char *recordPtr; /* Pointer to item record in which to
* store arrow information. */
int offset; /* Offset of shape information in widget
* record. */
{
LineItem *linePtr = (LineItem *) recordPtr;
double a, b, c;
int argc;
Tcl_Obj **objv = NULL;
if (offset != Tk_Offset(LineItem, arrowShapeA)) {
panic("ParseArrowShape received bogus offset");
}
if (Tcl_ListObjGetElements(interp, value, &argc, &objv) != TCL_OK) {
syntaxError:
Tcl_ResetResult(interp);
Tcl_AppendResult(interp, "bad arrow shape \"", Tcl_GetString(value),
"\": must be list with three numbers", (char *) NULL);
return TCL_ERROR;
}
if (argc != 3) {
goto syntaxError;
}
if ((Tk_CanvasGetCoordFromObj(interp, linePtr->canvas, objv[0], &a) != TCL_OK)
|| (Tk_CanvasGetCoordFromObj(interp, linePtr->canvas, objv[1], &b)
!= TCL_OK)
|| (Tk_CanvasGetCoordFromObj(interp, linePtr->canvas, objv[2], &c)
!= TCL_OK)) {
goto syntaxError;
}
linePtr->arrowShapeA = (float) a;
linePtr->arrowShapeB = (float) b;
linePtr->arrowShapeC = (float) c;
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* PrintArrowShape --
*
* This procedure is a callback invoked by the configuration
* code to return a printable value describing an arrow shape.
*
* Results:
* None.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
/* ARGSUSED */
static Tcl_Obj *
PrintArrowShape(clientData, tkwin, recordPtr, offset, freeProcPtr)
ClientData clientData; /* Not used. */
Tk_Window tkwin; /* Window associated with linePtr's widget. */
char *recordPtr; /* Pointer to item record containing current
* shape information. */
int offset; /* Offset of arrow information in record. */
Tcl_FreeProc **freeProcPtr; /* Store address of procedure to call to
* free string here. */
{
LineItem *linePtr = (LineItem *) recordPtr;
Tcl_Obj * result = Tcl_NewListObj(0,NULL);
Tcl_ListObjAppendElement(NULL,result,Tcl_NewDoubleObj(linePtr->arrowShapeA));
Tcl_ListObjAppendElement(NULL,result,Tcl_NewDoubleObj(linePtr->arrowShapeB));
Tcl_ListObjAppendElement(NULL,result,Tcl_NewDoubleObj(linePtr->arrowShapeC));
return result;
}
/*
*--------------------------------------------------------------
*
* ArrowParseProc --
*
* This procedure is invoked during option processing to handle
* the "-arrow" option.
*
* Results:
* A standard Tcl return value.
*
* Side effects:
* The arrow for a given item gets replaced by the arrow
* indicated in the value argument.
*
*--------------------------------------------------------------
*/
static int
ArrowParseProc(clientData, interp, tkwin, ovalue, widgRec, offset)
ClientData clientData; /* some flags.*/
Tcl_Interp *interp; /* Used for reporting errors. */
Tk_Window tkwin; /* Window containing canvas widget. */
Tcl_Obj * ovalue; /* Value of option. */
char *widgRec; /* Pointer to record for item. */
int offset; /* Offset into item. */
{
int c;
size_t length;
char *value = Tcl_GetString(ovalue);
register Arrows *arrowPtr = (Arrows *) (widgRec + offset);
if(value == NULL || *value == 0) {
*arrowPtr = ARROWS_NONE;
return TCL_OK;
}
c = value[0];
length = strlen(value);
if ((c == 'n') && (strncmp(value, "none", length) == 0)) {
*arrowPtr = ARROWS_NONE;
return TCL_OK;
}
if ((c == 'f') && (strncmp(value, "first", length) == 0)) {
*arrowPtr = ARROWS_FIRST;
return TCL_OK;
}
if ((c == 'l') && (strncmp(value, "last", length) == 0)) {
*arrowPtr = ARROWS_LAST;
return TCL_OK;
}
if ((c == 'b') && (strncmp(value, "both", length) == 0)) {
*arrowPtr = ARROWS_BOTH;
return TCL_OK;
}
Tcl_AppendResult(interp, "bad arrow spec \"", value,
"\": must be none, first, last, or both",
(char *) NULL);
*arrowPtr = ARROWS_NONE;
return TCL_ERROR;
}
/*
*--------------------------------------------------------------
*
* ArrowPrintProc --
*
* This procedure is invoked by the Tk configuration code
* to produce a printable string for the "-arrow"
* configuration option.
*
* Results:
* The return value is a string describing the arrows for
* the item referred to by "widgRec". In addition, *freeProcPtr
* is filled in with the address of a procedure to call to free
* the result string when it's no longer needed (or NULL to
* indicate that the string doesn't need to be freed).
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
static Tcl_Obj *
ArrowPrintProc(clientData, tkwin, widgRec, offset, freeProcPtr)
ClientData clientData; /* Ignored. */
Tk_Window tkwin; /* Window containing canvas widget. */
char *widgRec; /* Pointer to record for item. */
int offset; /* Offset into item. */
Tcl_FreeProc **freeProcPtr; /* Pointer to variable to fill in with
* information about how to reclaim
* storage for return string. */
{
register Arrows *arrowPtr = (Arrows *) (widgRec + offset);
Tcl_Obj * result = NULL;
switch (*arrowPtr) {
case ARROWS_FIRST:
return LangStringArg("first");
case ARROWS_LAST:
return LangStringArg("last");
case ARROWS_BOTH:
return LangStringArg("both");
default:
return LangStringArg("none");
}
}
/*
*--------------------------------------------------------------
*
* ConfigureArrows --
*
* If arrowheads have been requested for a line, this
* procedure makes arrangements for the arrowheads.
*
* Results:
* Always returns TCL_OK.
*
* Side effects:
* Information in linePtr is set up for one or two arrowheads.
* the firstArrowPtr and lastArrowPtr polygons are allocated
* and initialized, if need be, and the end points of the line
* are adjusted so that a thick line doesn't stick out past
* the arrowheads.
*
*--------------------------------------------------------------
*/
/* ARGSUSED */
static int
ConfigureArrows(canvas, linePtr)
Tk_Canvas canvas; /* Canvas in which arrows will be
* displayed (interp and tkwin
* fields are needed). */
LineItem *linePtr; /* Item to configure for arrows. */
{
double *poly, *coordPtr;
double dx, dy, length, sinTheta, cosTheta, temp;
double fracHeight; /* Line width as fraction of
* arrowhead width. */
double backup; /* Distance to backup end points
* so the line ends in the middle
* of the arrowhead. */
double vertX, vertY; /* Position of arrowhead vertex. */
double shapeA, shapeB, shapeC; /* Adjusted coordinates (see
* explanation below). */
double width;
Tk_State state = Tk_GetItemState(canvas, &linePtr->header);
if (linePtr->numPoints <2) {
return TCL_OK;
}
width = linePtr->outline.width;
if (((TkCanvas *)canvas)->currentItemPtr == (Tk_Item *)linePtr) {
if (linePtr->outline.activeWidth>width) {
width = linePtr->outline.activeWidth;
}
} else if (state==TK_STATE_DISABLED) {
if (linePtr->outline.disabledWidth>0) {
width = linePtr->outline.disabledWidth;
}
}
/*
* The code below makes a tiny increase in the shape parameters
* for the line. This is a bit of a hack, but it seems to result
* in displays that more closely approximate the specified parameters.
* Without the adjustment, the arrows come out smaller than expected.
*/
shapeA = linePtr->arrowShapeA + 0.001;
shapeB = linePtr->arrowShapeB + 0.001;
shapeC = linePtr->arrowShapeC + width/2.0 + 0.001;
/*
* If there's an arrowhead on the first point of the line, compute
* its polygon and adjust the first point of the line so that the
* line doesn't stick out past the leading edge of the arrowhead.
*/
fracHeight = (width/2.0)/shapeC;
backup = fracHeight*shapeB + shapeA*(1.0 - fracHeight)/2.0;
if (linePtr->arrow != ARROWS_LAST) {
poly = linePtr->firstArrowPtr;
if (poly == NULL) {
poly = (double *) ckalloc((unsigned)
(2*PTS_IN_ARROW*sizeof(double)));
poly[0] = poly[10] = linePtr->coordPtr[0];
poly[1] = poly[11] = linePtr->coordPtr[1];
linePtr->firstArrowPtr = poly;
}
dx = poly[0] - linePtr->coordPtr[2];
dy = poly[1] - linePtr->coordPtr[3];
length = hypot(dx, dy);
if (length == 0) {
sinTheta = cosTheta = 0.0;
} else {
sinTheta = dy/length;
cosTheta = dx/length;
}
vertX = poly[0] - shapeA*cosTheta;
vertY = poly[1] - shapeA*sinTheta;
temp = shapeC*sinTheta;
poly[2] = poly[0] - shapeB*cosTheta + temp;
poly[8] = poly[2] - 2*temp;
temp = shapeC*cosTheta;
poly[3] = poly[1] - shapeB*sinTheta - temp;
poly[9] = poly[3] + 2*temp;
poly[4] = poly[2]*fracHeight + vertX*(1.0-fracHeight);
poly[5] = poly[3]*fracHeight + vertY*(1.0-fracHeight);
poly[6] = poly[8]*fracHeight + vertX*(1.0-fracHeight);
poly[7] = poly[9]*fracHeight + vertY*(1.0-fracHeight);
/*
* Polygon done. Now move the first point towards the second so
* that the corners at the end of the line are inside the
* arrowhead.
*/
linePtr->coordPtr[0] = poly[0] - backup*cosTheta;
linePtr->coordPtr[1] = poly[1] - backup*sinTheta;
}
/*
* Similar arrowhead calculation for the last point of the line.
*/
if (linePtr->arrow != ARROWS_FIRST) {
coordPtr = linePtr->coordPtr + 2*(linePtr->numPoints-2);
poly = linePtr->lastArrowPtr;
if (poly == NULL) {
poly = (double *) ckalloc((unsigned)
(2*PTS_IN_ARROW*sizeof(double)));
poly[0] = poly[10] = coordPtr[2];
poly[1] = poly[11] = coordPtr[3];
linePtr->lastArrowPtr = poly;
}
dx = poly[0] - coordPtr[0];
dy = poly[1] - coordPtr[1];
length = hypot(dx, dy);
if (length == 0) {
sinTheta = cosTheta = 0.0;
} else {
sinTheta = dy/length;
cosTheta = dx/length;
}
vertX = poly[0] - shapeA*cosTheta;
vertY = poly[1] - shapeA*sinTheta;
temp = shapeC*sinTheta;
poly[2] = poly[0] - shapeB*cosTheta + temp;
poly[8] = poly[2] - 2*temp;
temp = shapeC*cosTheta;
poly[3] = poly[1] - shapeB*sinTheta - temp;
poly[9] = poly[3] + 2*temp;
poly[4] = poly[2]*fracHeight + vertX*(1.0-fracHeight);
poly[5] = poly[3]*fracHeight + vertY*(1.0-fracHeight);
poly[6] = poly[8]*fracHeight + vertX*(1.0-fracHeight);
poly[7] = poly[9]*fracHeight + vertY*(1.0-fracHeight);
coordPtr[2] = poly[0] - backup*cosTheta;
coordPtr[3] = poly[1] - backup*sinTheta;
}
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* LineToPostscript --
*
* This procedure is called to generate Postscript for
* line items.
*
* Results:
* The return value is a standard Tcl result. If an error
* occurs in generating Postscript then an error message is
* left in the interp's result, replacing whatever used
* to be there. If no error occurs, then Postscript for the
* item is appended to the result.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
static int
LineToPostscript(interp, canvas, itemPtr, prepass)
Tcl_Interp *interp; /* Leave Postscript or error message
* here. */
Tk_Canvas canvas; /* Information about overall canvas. */
Tk_Item *itemPtr; /* Item for which Postscript is
* wanted. */
int prepass; /* 1 means this is a prepass to
* collect font information; 0 means
* final Postscript is being created. */
{
LineItem *linePtr = (LineItem *) itemPtr;
char buffer[64 + TCL_INTEGER_SPACE];
char *style;
double width;
XColor *color;
Pixmap stipple;
Tk_State state = Tk_GetItemState(canvas, itemPtr);
width = linePtr->outline.width;
color = linePtr->outline.color;
stipple = linePtr->outline.stipple;
if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
if (linePtr->outline.activeWidth>width) {
width = linePtr->outline.activeWidth;
}
if (linePtr->outline.activeColor!=NULL) {
color = linePtr->outline.activeColor;
}
if (linePtr->outline.activeStipple!=None) {
stipple = linePtr->outline.activeStipple;
}
} else if (state==TK_STATE_DISABLED) {
if (linePtr->outline.disabledWidth>0) {
width = linePtr->outline.disabledWidth;
}
if (linePtr->outline.disabledColor!=NULL) {
color = linePtr->outline.disabledColor;
}
if (linePtr->outline.disabledStipple!=None) {
stipple = linePtr->outline.disabledStipple;
}
}
if (color == NULL || linePtr->numPoints<1 || linePtr->coordPtr==NULL) {
return TCL_OK;
}
if (linePtr->numPoints==1) {
sprintf(buffer, "%.15g %.15g translate %.15g %.15g",
linePtr->coordPtr[0], Tk_CanvasPsY(canvas, linePtr->coordPtr[1]),
width/2.0, width/2.0);
Tcl_AppendResult(interp, "matrix currentmatrix\n",buffer,
" scale 1 0 moveto 0 0 1 0 360 arc\nsetmatrix\n", (char *) NULL);
if (Tk_CanvasPsColor(interp, canvas, color)
!= TCL_OK) {
return TCL_ERROR;
}
if (stipple != None) {
Tcl_AppendResult(interp, "clip ", (char *) NULL);
if (Tk_CanvasPsStipple(interp, canvas, stipple) != TCL_OK) {
return TCL_ERROR;
}
} else {
Tcl_AppendResult(interp, "fill\n", (char *) NULL);
}
return TCL_OK;
}
/*
* Generate a path for the line's center-line (do this differently
* for straight lines and smoothed lines).
*/
if ((!linePtr->smooth) || (linePtr->numPoints < 3)) {
Tk_CanvasPsPath(interp, canvas, linePtr->coordPtr, linePtr->numPoints);
} else {
if ((stipple == None) && linePtr->smooth->postscriptProc) {
linePtr->smooth->postscriptProc(interp, canvas,
linePtr->coordPtr, linePtr->numPoints, linePtr->splineSteps);
} else {
/*
* Special hack: Postscript printers don't appear to be able
* to turn a path drawn with "curveto"s into a clipping path
* without exceeding resource limits, so TkMakeBezierPostscript
* won't work for stippled curves. Instead, generate all of
* the intermediate points here and output them into the
* Postscript file with "lineto"s instead.
*/
double staticPoints[2*MAX_STATIC_POINTS];
double *pointPtr;
int numPoints;
numPoints = linePtr->smooth->coordProc(canvas, (double *) NULL,
linePtr->numPoints, linePtr->splineSteps, (XPoint *) NULL,
(double *) NULL);
pointPtr = staticPoints;
if (numPoints > MAX_STATIC_POINTS) {
pointPtr = (double *) ckalloc((unsigned)
(numPoints * 2 * sizeof(double)));
}
numPoints = linePtr->smooth->coordProc(canvas, linePtr->coordPtr,
linePtr->numPoints, linePtr->splineSteps, (XPoint *) NULL,
pointPtr);
Tk_CanvasPsPath(interp, canvas, pointPtr, numPoints);
if (pointPtr != staticPoints) {
ckfree((char *) pointPtr);
}
}
}
/*
* Set other line-drawing parameters and stroke out the line.
*/
style = "0 setlinecap\n";
if (linePtr->capStyle == CapRound) {
style = "1 setlinecap\n";
} else if (linePtr->capStyle == CapProjecting) {
style = "2 setlinecap\n";
}
Tcl_AppendResult(interp, style, (char *) NULL);
style = "0 setlinejoin\n";
if (linePtr->joinStyle == JoinRound) {
style = "1 setlinejoin\n";
} else if (linePtr->joinStyle == JoinBevel) {
style = "2 setlinejoin\n";
}
Tcl_AppendResult(interp, style, (char *) NULL);
if (Tk_CanvasPsOutline(canvas, itemPtr,
&(linePtr->outline)) != TCL_OK) {
return TCL_ERROR;
}
/*
* Output polygons for the arrowheads, if there are any.
*/
if (linePtr->firstArrowPtr != NULL) {
if (stipple != None) {
Tcl_AppendResult(interp, "grestore gsave\n",
(char *) NULL);
}
if (ArrowheadPostscript(interp, canvas, linePtr,
linePtr->firstArrowPtr) != TCL_OK) {
return TCL_ERROR;
}
}
if (linePtr->lastArrowPtr != NULL) {
if (stipple != None) {
Tcl_AppendResult(interp, "grestore gsave\n", (char *) NULL);
}
if (ArrowheadPostscript(interp, canvas, linePtr,
linePtr->lastArrowPtr) != TCL_OK) {
return TCL_ERROR;
}
}
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* ArrowheadPostscript --
*
* This procedure is called to generate Postscript for
* an arrowhead for a line item.
*
* Results:
* The return value is a standard Tcl result. If an error
* occurs in generating Postscript then an error message is
* left in the interp's result, replacing whatever used
* to be there. If no error occurs, then Postscript for the
* arrowhead is appended to the result.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
static int
ArrowheadPostscript(interp, canvas, linePtr, arrowPtr)
Tcl_Interp *interp; /* Leave Postscript or error message
* here. */
Tk_Canvas canvas; /* Information about overall canvas. */
LineItem *linePtr; /* Line item for which Postscript is
* being generated. */
double *arrowPtr; /* Pointer to first of five points
* describing arrowhead polygon. */
{
Pixmap stipple;
Tk_State state = Tk_GetItemState(canvas, &linePtr->header);
stipple = linePtr->outline.stipple;
if (((TkCanvas *)canvas)->currentItemPtr == (Tk_Item *)linePtr) {
if (linePtr->outline.activeStipple!=None) {
stipple = linePtr->outline.activeStipple;
}
} else if (state==TK_STATE_DISABLED) {
if (linePtr->outline.activeStipple!=None) {
stipple = linePtr->outline.disabledStipple;
}
}
Tk_CanvasPsPath(interp, canvas, arrowPtr, PTS_IN_ARROW);
if (stipple != None) {
Tcl_AppendResult(interp, "clip ", (char *) NULL);
if (Tk_CanvasPsStipple(interp, canvas, stipple)
!= TCL_OK) {
return TCL_ERROR;
}
} else {
Tcl_AppendResult(interp, "fill\n", (char *) NULL);
}
return TCL_OK;
}