#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <math.h>
#include "gd.h"
#define DEGTORAD(x) ( (x) * (2.0 * 3.14159265) / 360.0 )

void
doerr (FILE * err, const char *msg)
{
	if (err) {
		fprintf (err, "%s\n", msg);
		fflush (err);
	}
}

void
dowheel (gdImagePtr im, int color, char *fontfile, int fontsize,
         double angle, int x, int y, int offset, char *string)
{
	int brect[8];
	FILE *err;
	double curangrads, curang, x0, y0;
	char *cp;

	err = fopen ("err.out", "a");
	doerr (err, "------------- New fontwheel --------------");
	doerr (err, fontfile);
	doerr (err, string);
	doerr (err, "------------------------------------------");

	for (curang = 0.0; curang < 360.0; curang += angle) {
		curangrads = DEGTORAD(curang);
		x0 = x + cos (curangrads) * offset;
		y0 = y - sin (curangrads) * offset;

		/* The case of newlines is taken care of in the gdImageStringTTF call */
		cp = gdImageStringFT (im, brect, color, fontfile, fontsize,
		                      curangrads, x0, y0, string);
		if (cp)
			doerr (err, cp);

		gdImagePolygon (im, (gdPointPtr)brect, 4, color);
	}

	fclose (err);
}

#if 0
void
dolines (gdImagePtr im, int color, double incr, int x, int y, int offset,
         int length)
{
	double curang;
	double angle;
	double x0, x1, y0, y1;
	for (curang = 0.0; curang < 360.0; curang += incr) {
		angle = curang * (2.0 * 3.14159265) / 360.0;
		x0 = cos (angle) * offset + x;
		x1 = cos (angle) * (offset + length) + x;
		y0 = sin (angle) * offset + y;
		y1 = sin (angle) * (offset + length) + y;
		gdImageLine (im, x0, y0, x1, y1, color);
	}
}
#endif

void
dotest (char *font, int size, double incr,
        int w, int h, char *string, const char *filename)
{
	gdImagePtr im;
	FILE *out;
	int bg;
	int fc;
#if 0
	int lc;
#endif
	int xc = w / 2;
	int yc = h / 2;

	im = gdImageCreate (w, h);
	bg = gdImageColorAllocate (im, 0, 0, 0);

	gdImageFilledRectangle (im, 1, 1, w - 1, h - 1, bg);

	fc = gdImageColorAllocate (im, 255, 192, 192);
#if 0
	lc = gdImageColorAllocate (im, 192, 255, 255);
#endif

	out = fopen (filename, "wb");

	dowheel (im, fc, font, size, incr, xc, yc, 20, string);
#if 0
	dolines (im, lc, incr, xc, yc, 20, 120);
#endif

#if defined(HAVE_LIBPNG)
	gdImagePng (im, out);
#elif defined(HAVE_LIBJPEG)
	gdImageJpeg (im, out, -1);
#endif

	fclose (out);
}

int
main(void)
{

#if defined(HAVE_LIBPNG)
	dotest ("times", 16, 20.0, 400, 400, "Hello, there!",
	        "fontwheeltest1.png");
	dotest ("times", 16, 30.0, 400, 400, "Hello, there!",
	        "fontwheeltest2.png");
	dotest ("arial", 16, 45.0, 400, 400, "Hello, there!",
	        "fontwheeltest3.png");
	dotest ("arial", 16, 90.0, 400, 400, "Hello\nthere!",
	        "fontwheeltest4.png");
#elif defined(HAVE_LIBJPEG)
	dotest ("times", 16, 20.0, 400, 400, "Hello, there!",
	        "fontwheeltest1.jpeg");
	dotest ("times", 16, 30.0, 400, 400, "Hello, there!",
	        "fontwheeltest2.jpeg");
	dotest ("arial", 16, 45.0, 400, 400, "Hello, there!",
	        "fontwheeltest3.jpeg");
	dotest ("arial", 16, 90.0, 400, 400, "Hello\nthere!",
	        "fontwheeltest4.jpeg");
#else
	fprintf(stderr, "no PNG or JPEG support\n");
#endif

	return 0;
}
