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/* $Id$ */
#include "gd.h"
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
gdImagePtr loadImage(const char *name)
{
FILE *fp;
gdImagePtr im;
fp = fopen(name, "rb");
if (!fp) {
fprintf(stderr, "Can't open jpeg file\n");
gdImageDestroy(im);
return NULL;
}
im = gdImageCreateFromJpeg(fp);
fclose(fp);
return im;
}
int savePngImage(gdImagePtr im, const char *name)
{
FILE *fp;
fp = fopen(name, "wb");
if (!fp) {
fprintf(stderr, "Can't save png image fromtiff.png\n");
return 0;
}
gdImagePng(im, fp);
fclose(fp);
return 1;
}
int main(int argc, char **arg)
{
gdImagePtr im, im2;
int new_width, new_height;
double angle;
if (argc < 3) {
fprintf(stderr, "Usage: copyrotated [angle in degree] [filename.png]\n");
return 1;
}
angle = strtod(arg[1], 0);
im = loadImage(arg[2]);
if (!im) {
fprintf(stderr, "Can't load PNG file <%s>", arg[1]);
return 1;
}
/*
cos adj hyp (cos = adjacent / hypothenus)
sin op hyp (sin adjacent / hypothenus)
*/
new_width = cos(angle * .0174532925) * gdImageSX(im)
- sin(angle * .0174532925) * gdImageSY(im) + 1;
new_height = - sin(angle * .0174532925) * gdImageSX(im)
+ cos(angle * .0174532925) * gdImageSY(im) + 1;
im2 = gdImageCreateTrueColor(new_width, new_height);
if (!im2) {
fprintf(stderr, "Can't create a new image");
gdImageDestroy(im);
return 1;
}
gdImageCopyRotated(im2, im, new_width/2, new_height/2, 0, 0, gdImageSX(im), gdImageSY(im), angle);
if (!savePngImage(im2, "rotated.png")) {
fprintf(stderr, "Can't save PNG file rotated.png");
gdImageDestroy(im);
gdImageDestroy(im2);
return 1;
}
gdImageDestroy(im2);
gdImageDestroy(im);
return 0;
}
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