Bibliothèque de traitements d'images en virgule flottante. http://la.buvette.org/photos/cumul/
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FloatImg/funcs/misc-plots.c

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2.1 KiB

/*
testing some random funcs.
*/
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include "../floatimg.h"
/* --------------------------------------------------------------------- */
int fimg_test_pattern(FloatImg *fimg, int type, double dval)
{
int nio;
int x, y;
float fr, fg, fb;
#if DEBUG_LEVEL
fprintf(stderr, ">>> %s ( %p %d %g )\n", __func__, fimg, type, dval);
#endif
if (fimg->type != FIMG_TYPE_RGB) {
fprintf(stderr, "%s need an rgb pic\n", __func__);
return -6;
}
/* rampe de primaires dans le quart du haut */
for (x=0; x<fimg->width; x++) {
nio = x / (fimg->width / 8);
switch(nio) {
case 0:
fr = 0.0, fg = 0.0, fb = 0.0; break;
case 1:
fr = 1.0, fg = 0.0, fb = 0.0; break;
case 2:
fr = 0.0, fg = 1.0, fb = 0.0; break;
case 3:
fr = 1.0, fg = 1.0, fb = 0.0; break;
case 4:
fr = 0.0, fg = 0.0, fb = 1.0; break;
case 5:
fr = 1.0, fg = 0.0, fb = 1.0; break;
case 6:
fr = 0.0, fg = 1.0, fb = 1.0; break;
case 7:
fr = 1.0, fg = 1.0, fb = 1.0; break;
default:
// abort();
break;
}
for (y=0; y<fimg->height/4; y++)
fimg_plot_rgb(fimg, x, y, fr, fg, fb);
}
return -1;
}
/* --------------------------------------------------------------------- */
int fimg_draw_something(FloatImg *fimg)
{
int x, y;
float fx, fy;
#define K (3.14159*13.456)
#define M 100.0
for (x=0; x<fimg->width; x++) {
fimg_plot_rgb(fimg, x, 0,
(float)x,
(float)x + 5.678,
(float)x * 1.33333);
}
for (y=1; y<fimg->height; y++) {
fy = (float)y / (float)fimg->height;
for (x=0; x<fimg->width; x++) {
fx = (float)x / (float)fimg->width;
fimg_plot_rgb(fimg, x, y,
M*(cos(fx*K)+1.2),
M*(sin(fy*K)+1.4),
M*(cos(fx*fy)+1.6));
}
}
return 0;
}
/* --------------------------------------------------------------------- */
int fimg_multirandom(FloatImg *fimg)
{
int foo, x, y;
#define RI ( (rand()/7) + (rand()/9) )
#define RD ( (drand48()/7) + (drand48()/7) )
for (foo=0; foo<100000000; foo++)
{
x = RI % fimg->width;
y = RI % fimg->height;
fimg_add_rgb(fimg, x, y, RD, RD, RD);
}
return 0;
}
/* --------------------------------------------------------------------- */