/* frac.c: layout/dimentioning and drawing routines for fractions. */
/* This file is part of asciiTeX.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; see the file COPYING. If not, write to
The Free Software Foundation, Inc.
59 Temple Place, Suite 330
Boston, MA 02111 USA
Authors:
Original program (eqascii): Przemek Borys
Fork by: Bart Pieters
*************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "parsedef.h"
#include "asciiTeX_struct.h"
#include "utils.h"
#include "frac.h"
#include "dim.h"
#include "draw.h"
int
dimFrac(char *found, char **Gpos, Tdim * Our, struct Tgraph *graph)
/*
The dimXxx routines all have the forllowing arguments:
found -- Pointer to a sting containing the remaining part of the equation
Gpos -- Pointer to a string which will contain the part of the equation
relevant to the current parent with flags to indicate which drawing
routines to use.
Our -- dimention of the parent
graph -- The parent
The routines returns the number of characters it used of the found vector.
*/
{
Tdim out;
char *start,
*end,
*tmp;
#define our (*Our)
#define gpos (*Gpos)
int height = 0,
width = 0;
*gpos = 1; /* See parsedef.h for the keyword
* definitions */
gpos++;
*gpos = (char) FRAC;
gpos++;
*gpos = 0;
start = strchr(found, '{');
if (start)
end = findClosingBrace(start + 1);
if (!start || !end || (end - start < 2))
{
SyntaxError("Usage: \\frac{num}{den}\n\tProduces the fraction num divided by den.\n");
return 0;
}
if (start - found - 5 > 0)
fprintf(stderr,
"Warning spurious characters ignores in \\frac\n");
*end = 0;
tmp = strdup(start + 1);
*end = '}';
out = dim(tmp, newChild(graph));
free(tmp);
height += out.y;
width = out.x;
start = strchr(end, '{');
if (start - end - 1 > 0)
SyntaxWarning("Warning spurious characters ignored in \\frac\n");
if (start)
end = findClosingBrace(start + 1);
if (!start || !end || (end - start < 2))
{
SyntaxError("Usage: \\frac{num}{den}\n\tProduces the fraction num divided by den.\n");
return 0;
}
*end = 0;
tmp = strdup(start + 1);
*end = '}';
out = dim(tmp, newChild(graph));
free(tmp);
if (out.y > our.baseline)
{
our.y += out.y - our.baseline;
our.baseline = out.y; /* baseline+(out.y-baseline) */
}
if (height > our.y - our.baseline - 1)
{
our.y += height - (our.y - our.baseline - 1);
}
if (out.x > width)
our.x += out.x;
else
our.x += width;
if (our.baseline < out.y)
our.baseline = out.y;
return end - (found); /* skip parsed text */
#undef our
#undef gpos
}
void
drawFrac(int *Kid, int *Curx, int *Cury, char ***screen,
struct Tgraph *graph)
/*
The drawXxx routines all have the forllowing arguments:
Kid -- Ineger index of the current child
Curx -- Current x position in the 2D character field
Cury -- Current y position in the 2D character field
screen -- pointer to the 2D character field
graph -- The parent
*/
{
#define kid (*Kid)
#define curx (*Curx)
#define cury (*Cury)
int width = graph->down[kid]->dim.x;
int i;
if (width < graph->down[kid + 1]->dim.x)
width = graph->down[kid + 1]->dim.x;
drawInternal(screen, graph->down[kid],
curx + width / 2 - (graph->down[kid]->dim.x) / 2,
cury - (graph->down[kid]->dim.y));
drawInternal(screen, graph->down[kid + 1],
curx + width / 2 - (graph->down[kid + 1]->dim.x) / 2,
cury + 1);
for (i = 0; i < width; i++)
(*screen)[cury][curx++] = '-';
kid += 2;
}