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  1. #include <stdio.h>
  2. #include "gd.h"
  3. #include "gdfontg.h"
  4. #include "gdfonts.h"
  5.  
  6. int main(void)
  7. {
  8.         /* Input and output files */
  9.         FILE *in;
  10.         FILE *out;
  11.  
  12.         /* Input and output images */
  13.         gdImagePtr im_in, im_out;
  14.  
  15.         /* Brush image */
  16.         gdImagePtr brush;
  17.  
  18.         /* Color indexes */
  19.         int white;
  20.         int blue;
  21.         int red;
  22.         int green;
  23.  
  24.         /* Points for polygon */
  25.         gdPoint points[3];
  26.  
  27.         /* Create output image, 128 by 128 pixels. */
  28.         im_out = gdImageCreate(128, 128);
  29.  
  30.         /* First color allocated is background. */
  31.         white = gdImageColorAllocate(im_out, 255, 255, 255);
  32.  
  33.         /* Set transparent color. */
  34.         gdImageColorTransparent(im_out, white);
  35.  
  36.         /* Try to load demoin.gif and paste part of it into the
  37.                 output image. */
  38.  
  39.         in = fopen("demoin.gif", "rb");
  40.         if (!in) {
  41.                 fprintf(stderr, "Can't load source image; this demo\n");
  42.                 fprintf(stderr, "is much more impressive if demoin.gif\n");
  43.                 fprintf(stderr, "is available.\n");
  44.                 im_in = 0;
  45.         } else {
  46.                 im_in = gdImageCreateFromGif(in);
  47.                 fclose(in);
  48.                 /* Now copy, and magnify as we do so */
  49.                 gdImageCopyResized(im_out, im_in,
  50.                         16, 16, 0, 0, 96, 96, 127, 127);               
  51.         }
  52.         red = gdImageColorAllocate(im_out, 255, 0, 0);
  53.         green = gdImageColorAllocate(im_out, 0, 255, 0);
  54.         blue = gdImageColorAllocate(im_out, 0, 0, 255);
  55.         /* Rectangle */
  56.         gdImageLine(im_out, 8, 8, 120, 8, green);      
  57.         gdImageLine(im_out, 120, 8, 120, 120, green);  
  58.         gdImageLine(im_out, 120, 120, 8, 120, green);  
  59.         gdImageLine(im_out, 8, 120, 8, 8, green);      
  60.         /* Circle */
  61.         gdImageArc(im_out, 64, 64, 30, 10, 0, 360, blue);
  62.         /* Arc */
  63.         gdImageArc(im_out, 64, 64, 20, 20, 45, 135, blue);
  64.         /* Flood fill */
  65.         gdImageFill(im_out, 4, 4, blue);
  66.         /* Polygon */
  67.         points[0].x = 32;
  68.         points[0].y = 0;
  69.         points[1].x = 0;
  70.         points[1].y = 64;      
  71.         points[2].x = 64;
  72.         points[2].y = 64;      
  73.         gdImageFilledPolygon(im_out, points, 3, green);
  74.         /* Brush. A fairly wild example also involving a line style! */
  75.         if (im_in) {
  76.                 int style[8];
  77.                 brush = gdImageCreate(8, 8);
  78.                 gdImageCopyResized(brush, im_in,
  79.                         0, 0, 0, 0,
  80.                         gdImageSX(brush), gdImageSY(brush),
  81.                         gdImageSX(im_in), gdImageSY(im_in));
  82.                 gdImageSetBrush(im_out, brush);
  83.                 /* With a style, so they won't overprint each other.
  84.                         Normally, they would, yielding a fat-brush effect. */
  85.                 style[0] = 0;
  86.                 style[1] = 0;
  87.                 style[2] = 0;
  88.                 style[3] = 0;
  89.                 style[4] = 0;
  90.                 style[5] = 0;
  91.                 style[6] = 0;
  92.                 style[7] = 1;
  93.                 gdImageSetStyle(im_out, style, 8);
  94.                 /* Draw the styled, brushed line */
  95.                 gdImageLine(im_out, 0, 127, 127, 0, gdStyledBrushed);
  96.         }
  97.         /* Text */
  98.         gdImageString(im_out, gdFontGiant, 16, 16, "hi", red);
  99.         gdImageStringUp(im_out, gdFontSmall, 32, 32, "hi", red);
  100.         /* Make output image interlaced (allows "fade in" in some viewers,
  101.                 and in the latest web browsers) */
  102.         gdImageInterlace(im_out, 1);
  103.         out = fopen("demoout.gif", "wb");
  104.         /* Write GIF */
  105.         gdImageGif(im_out, out);
  106.         fclose(out);
  107.         gdImageDestroy(im_out);
  108.         if (im_in) {
  109.                 gdImageDestroy(im_in);
  110.         }
  111.         return 0;
  112. }
  113.  
  114.