- add copyRotated example

examples/CMakeLists.txt

@@ -6,13 +6,13 @@ SET(TESTS_FILES
   tiffread
   resize
   copyrotated
-  ellipseaa
-  ellipse
+#  ellipseaa
+#  ellipse
   arc
-  ellipsearc
+#  ellipsearc
   flip
   crop
-  ellfullaa
+#  ellfullaa
   tgaread
   nnquant
   gif

examples/copyrotated.c

@@ -0,0 +1,84 @@
+/* $Id$ */
+#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;
+}