circletexttest.c

Linux/Unix下的绘图函数库（Graphic Drawing Library）

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

#include <stdio.h>
#include "gd.h"

/* 2.0.22: oops, we need config.h */
#include "config.h"

int
main (int argc, char *argv[])
{
  /* 2.0.22: can't depend on PNG either  */
#ifndef HAVE_LIBPNG
  fprintf (stderr, "Requires PNG support, gd was compiled without it\n");
  exit (0);
#else
  char *error;
  FILE *in = 0;
  FILE *out;
  gdImagePtr im;
  int radius;
  /* Create an image of text on a circle, with an
     alpha channel so that we can copy it onto a
     background */
  /* TBB: 2.0.18: shouldn't depend on JPEG */
#ifdef HAVE_LIBJPEG
  in = fopen ("eleanor.jpg", "rb");
  if (!in)
    {
      im = gdImageCreateTrueColor (300, 300);
    }
  else
    {
      im = gdImageCreateFromJpeg (in);
      fclose (in);
    }
#else
  im = gdImageCreateTrueColor (300, 300);
#endif /* HAVE_LIBJPEG */
  if (gdImageSX (im) < gdImageSY (im))
    {
      radius = gdImageSX (im) / 2;
    }
  else
    {
      radius = gdImageSY (im) / 2;
    }
  error = gdImageStringFTCircle (im,
			 gdImageSX (im) / 2,
			 gdImageSY (im) / 2,
			 radius,
			 radius / 2,
			 0.8,
			 "arial",
			 24,
			 "top text",
			 "bottom text",
			 gdTrueColorAlpha (192, 100, 255, 32));
  if (error) 
    {
      fprintf(stderr, "gdImageStringFTEx error: %s\n", error);
    }
  out = fopen ("gdfx.png", "wb");
  if (!out)
    {
      fprintf (stderr, "Can't create gdfx.png\n");
      return 1;
    }
  gdImagePng (im, out);
  fclose (out);
  gdImageDestroy (im);
#endif /* HAVE_LIBPNG */
  return 0;
}