libtthimage/Lib/patterns3.c

143 lines
2.7 KiB
C

/*
patterns3.c
------------------
see also 'patterns.c' & 'patterns2.c'
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <math.h>
#include "../tthimage.h"
/*::------------------------------------------------------------------::*/
/*
* c'est quasiment impossible de documenter cette fonction.
*/
int
Image_pattern_100(Image_Desc *dst, int kr, int kg, int kb)
{
int x, y, r,g, b;
for (x=0; x<dst->width; x++)
{
for (y=0; y<dst->height; y++)
{
r = abs(x+y-(dst->width/3)) * kr;
g = abs(x-y-(dst->height/3)) * kg;
b = (rand() % 42) + kb;
Image_plotRGB(dst, x, y, r, g, b);
}
}
return FUNC_IS_BETA;
}
/*::------------------------------------------------------------------::*/
int
Image_pattern_101(Image_Desc *dst, int kr, int kg, int kb)
{
int x, y, r,g, b;
if (kr == 0) kr = 1;
if (kg == 0) kg = 1;
if (kb == 0) kb = 1;
for (x=0; x<dst->width; x++)
{
for (y=0; y<dst->height; y++)
{
if (x < dst->width/2)
{ r=x/kr; g=y/kg; b=x/kb; }
else
{ r=y/kr; g=x/kg; b=y/kb; }
Image_plotRGB(dst, x, y, r, g, b);
}
}
return FUNC_IS_BETA;
}
/*::------------------------------------------------------------------::*/
int
Image_pattern_102(Image_Desc *dst, int param, int kr, int kg, int kb)
{
int x, y, r,g, b;
for (x=0; x<dst->width; x++)
{
for (y=0; y<dst->height; y++)
{
r = x ^ kr;
g = y ^ kg;
b = (x+y) ^ kb;
Image_plotRGB(dst, x, y, r, g, b);
}
}
return FUNC_NOT_FINISH;
}
/*::------------------------------------------------------------------::*/
/* hop, 31 mars 2008, une petite evolution stochastique de base...
* */
int
Image_pattern_103(Image_Desc *dst, int param, int kr, int kg, int kb)
{
int x, y, r, g, b;
long surface;
double dx, dy;
#if DEBUG_LEVEL
fprintf(stderr, "%s: acting on image %p\n", __func__, dst);
#endif
surface = dst->width * dst->height;
for (x=0; x<dst->width; x++)
{
dx = (double)x / (double)dst->width;
for (y=0; y<dst->height; y++)
{
dy = (double)x / (double)dst->height;
r = (int)round(256.0 * sqrt(dx * dy));
g = b = rand() & 0xf0;
Image_plotRGB(dst, x, y, r, g, b);
}
}
return FUNC_NOT_FINISH;
}
/*::------------------------------------------------------------------::*/
/*
* new 10 juillet 2003
*/
int
Image_pattern_104(Image_Desc *dst, int sx, int sy, RGBA *a, RGBA *b)
{
int x, y, fx, fy;
for (x=0; x<dst->width; x++)
{
fx = x % sx;
for (y=0; y<dst->height; y++)
{
fy = y % sy;
if (fx==1 && fy==1)
{
Image_plotRGB(dst, x, y, a->r, a->g, a->b);
}
else
{
Image_plotRGB(dst, x, y, b->r, b->g, b->b);
}
}
#if DEBUG_LEVEL > 1
fprintf(stderr, "%05d\r", x);
#endif
}
return FUNC_IS_ALPHA;
}
/*::------------------------------------------------------------------::*/