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/*
graph.c
*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
*
* Part of: SExtractor
*
* Author: E.BERTIN (IAP)
*
* Contents: simple graphical functions.
*
* Last modify: 13/12/2002
*
*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <math.h>
#include <stdlib.h>
#include "define.h"
#include "globals.h"
double sexx1, sexy1;
/********************************* sexmove **********************************/
/*
Move function (related to sexdraw)..
*/
void sexmove(double x, double y)
{
sexx1 = x;
sexy1 = y;
return;
}
/********************************* sexdraw **********************************/
/*
Draw a line in a PIXTYPE bitmap.
*/
void sexdraw(PIXTYPE *bmp, int w, int h, double sexx2, double sexy2,
PIXTYPE val)
{
double dx,dy, slope;
int ix1,iy1, ix2,iy2, ix,iy;
dx = sexx2-sexx1;
dy = sexy2-sexy1;
if (fabs(dx) > fabs(dy))
{
slope = dy/dx;
ix1 = RINT(sexx1);
ix2 = RINT(sexx2);
if (ix2>ix1)
{
for (ix=ix1+1; ix<=ix2; ix++)
if (ix>=0 && ix<w)
{
iy = RINT(sexy1+(ix-sexx1)*slope);
if (iy>=0 && iy<h)
bmp[ix+w*iy] += val;
}
}
else
{
for (ix=ix1-1; ix>=ix2; ix--)
if (ix>=0 && ix<w)
{
iy = RINT(sexy1+(ix-sexx1)*slope);
if (iy>=0 && iy<h)
bmp[ix+w*iy] += val;
}
}
}
else
{
slope = dx/(dy == 0.0? 1.0:dy);
iy1 = RINT(sexy1);
iy2 = RINT(sexy2);
if (iy2>iy1)
{
for (iy=iy1+1; iy<=iy2; iy++)
if (iy>=0 && iy<h)
{
ix = RINT(sexx1+(iy-sexy1)*slope);
if (ix>=0 && ix<w)
bmp[ix+w*iy] += val;
}
}
else
for (iy=iy1-1; iy>=iy2; iy--)
{
if (iy>=0 && iy<h)
{
ix = RINT(sexx1+(iy-sexy1)*slope);
if (ix>=0 && ix<w)
bmp[ix+w*iy] += val;
}
}
}
sexx1 = sexx2;
sexy1 = sexy2;
return;
}
/******************************** sexcircle *********************************/
/*
Draw a circle in a PIXTYPE bitmap.
*/
void sexcircle(PIXTYPE *bmp, int w, int h, double x, double y, double r,
PIXTYPE val)
{
int i;
sexmove(x+r, y);
for (i=0; i<37; i++)
sexdraw(bmp,w,h, x+r*ctg[i], y+r*stg[i], val);
return;
}
/******************************** sexellips *********************************/
/*
Draw an ellips in a PIXTYPE bitmap.
*/
void sexellips(PIXTYPE *bmp, int w, int h, double x, double y, double a,
double b, double theta, PIXTYPE val, int dotflag)
{
int i;
double ct, st;
ct = cos(PI*theta/180);
st = sin(PI*theta/180);
sexmove(x+a*ct, y+a*st);
for (i=1; i<37; i++)
if (dotflag && !(i&1))
sexmove(x + a*ctg[i]*ct - b*stg[i]*st,
y + a*ctg[i]*st + b*stg[i]*ct);
else
sexdraw(bmp,w,h, x + a*ctg[i]*ct - b*stg[i]*st,
y + a*ctg[i]*st + b*stg[i]*ct, val);
return;
}