libtthimage/Lib/warp0.c

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2022-06-27 00:48:18 +02:00
/*
warp0.c
---------------
diverses deformations d'image.
*/
#include <stdio.h>
#include <math.h>
#include "../tthimage.h"
#ifndef DEBUG_LEVEL
#define DEBUG_LEVEL 1
#endif
/*::------------------------------------------------------------------::*/
/*
* bon, caisse que peut bien faire ce truc ?
*/
int
Image_warp_essai_0(Image_Desc *src, Image_Desc *dst, double angle,
int xc, int yc)
{
int x, y, r, g, b;
long lfoo;
double arad, dheight, dwidth, tmax, dist, va;
int ofx, ofy;
dheight = (double)dst->height;
dwidth = (double)dst->width;
lfoo = ((dst->height*dst->height)+(dst->width*dst->width));
tmax = sqrt((double)lfoo) / 2.0;
va = angle / 360.0;
fprintf(stderr, "%s : %d,%d dh = %f dw = %f tmax = %f\n", __func__,
xc, yc, dheight, dwidth, tmax);
for (y=0; y<dst->height; y++)
{
/*
printf("------- Ligne %d -----------------\n", y);
*/
arad = ((double)y / dheight) * M_PI;
for (x=0; x<dst->width; x++)
{
dist = (double)x / dwidth;
ofx = xc + (int)(sin(arad)*dist*tmax);
ofy = yc + (int)(cos(arad)*dist*tmax);
/*
printf("%15f %15f %6d %6d\n", arad, dist, ofx, ofy);
*/
if ( ofx>=0 && ofx<src->width && ofy>=0 && ofy<src->height )
{
Image_getRGB(src, ofx, ofy, &r, &g, &b);
}
else
{
r = g = b = 0;
}
Image_plotRGB(dst, x, y, r, g, b);
}
}
return FUNC_NOT_FINISH;
}
/*::------------------------------------------------------------------::*/
int
Image_warp_essai_1(Image_Desc *src, Image_Desc *dst, double angle)
{
#if DEBUG_LEVEL
fprintf(stderr, "Warp 1: what I can do here ?\n");
#endif
return FUNC_NOT_FINISH;
}
/*::------------------------------------------------------------------::*/
/*
* voir aussi les module scale.c et warp1.c
*/
/*::------------------------------------------------------------------::*/