61 lines
1.2 KiB
C
61 lines
1.2 KiB
C
/*
|
|
gradient.c
|
|
----------
|
|
|
|
new: Sun Sep 17 20:47:57 UTC 2023
|
|
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include <math.h>
|
|
|
|
#include "../tthimage.h"
|
|
|
|
/*::------------------------------------------------------------------::*/
|
|
int Image_plot_H_gradient(char *fname, int w, int h)
|
|
{
|
|
Image_Desc *img;
|
|
int x, y, pix, foo;
|
|
float fval;
|
|
|
|
if ( (img = Image_alloc(w, h, IMAGE_RGB)) == NULL ) {
|
|
#if DEBUG_LEVEL
|
|
fprintf(stderr, "%s: alloc of img failed, file=%s\n", __func__, fname);
|
|
#endif
|
|
return IMAGE_NO_MEM;
|
|
}
|
|
|
|
for (x=0; x<w; x++) {
|
|
fval = (float)x / (float)(w-1);
|
|
pix = (int)(fval * 255.0);
|
|
#if DEBUG_LEVEL > 1
|
|
printf("%5d %6.3f %5d\n", x, fval, pix);
|
|
#endif
|
|
for (y=0; y<h; y++) {
|
|
(img->Rpix[y])[x] = pix;
|
|
(img->Gpix[y])[x] = pix;
|
|
(img->Bpix[y])[x] = pix;
|
|
}
|
|
}
|
|
|
|
foo = Image_TGA_save(fname, img, 0);
|
|
if (foo) {
|
|
fprintf(stderr, "%s: err write to '%s'\n", __func__, fname);
|
|
return FULL_NUCKED;
|
|
}
|
|
|
|
Image_DeAllocate(img); free(img);
|
|
|
|
return FUNC_IS_BETA;
|
|
}
|
|
|
|
/*::------------------------------------------------------------------::*/
|
|
int Image_plot_V_gradient(char *fname, int w, int h)
|
|
{
|
|
|
|
return FUNC_IS_ALPHA;
|
|
}
|
|
/*::------------------------------------------------------------------::*/
|