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gd-libgd / src / gddemo.c

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

#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#include "gd.h"
#include "gdfontt.h"
#include "gdfonts.h"
#include "gdfontmb.h"
#include "gdfontl.h"
#include "gdfontg.h"

int
main (void)
{
#ifdef HAVE_LIBPNG
	/* Input and output files */
	FILE *in;
	FILE *out;

	/* Input and output images */
	gdImagePtr im_in = 0, im_out = 0;

	/* Brush image */
	gdImagePtr brush;

	/* Color indexes */
	int white;
	int blue;
	int red;
	int green;

	/* Points for polygon */
	gdPoint points[3];
	int i;

	/* gd fonts for font test */
	gdFontPtr fonts[5];
	int y;

	/* Create output image, in true color. */
	im_out = gdImageCreateTrueColor (256 + 384, 384);
	/* 2.0.2: first color allocated would automatically be background in a
	   palette based image. Since this is a truecolor image, with an
	   automatic background of black, we must fill it explicitly. */
	white = gdImageColorAllocate (im_out, 255, 255, 255);
	gdImageFilledRectangle (im_out, 0, 0, gdImageSX (im_out),
	                        gdImageSY (im_out), white);

	/* Set transparent color. */
	gdImageColorTransparent (im_out, white);

	/* Try to load demoin.png and paste part of it into the
	   output image. */
	in = fopen ("demoin.png", "rb");
	if (!in) {
		fprintf(stderr, "Can't load source image; this demo\n");
		fprintf(stderr, "is much more impressive if demoin.png\n");
		fprintf(stderr, "is available.\n");
		im_in = 0;
	} else {
		int a;
		im_in = gdImageCreateFromPng (in);
		fclose (in);
		/* Now copy, and magnify as we do so */
		gdImageCopyResampled (im_out, im_in, 32, 32, 0, 0, 192, 192, 255, 255);
		/* Now display variously rotated space shuttles in a circle of our own */
		for (a = 0; (a < 360); a += 45) {
			int cx = cos (a * .0174532925) * 128;
			int cy = -sin (a * .0174532925) * 128;
			gdImageCopyRotated (im_out, im_in,
			                    256 + 192 + cx, 192 + cy,
			                    0, 0, gdImageSX (im_in), gdImageSY (im_in), a);
		}
	}
	red = gdImageColorAllocate (im_out, 255, 0, 0);
	green = gdImageColorAllocate (im_out, 0, 255, 0);
	blue = gdImageColorAllocate (im_out, 0, 0, 255);
	/* Fat Rectangle */
	gdImageSetThickness (im_out, 4);
	gdImageLine (im_out, 16, 16, 240, 16, green);
	gdImageLine (im_out, 240, 16, 240, 240, green);
	gdImageLine (im_out, 240, 240, 16, 240, green);
	gdImageLine (im_out, 16, 240, 16, 16, green);
	gdImageSetThickness (im_out, 1);
	/* Circle */
	gdImageArc (im_out, 128, 128, 60, 20, 0, 720, blue);
	/* Arc */
	gdImageArc (im_out, 128, 128, 40, 40, 90, 270, blue);
	/* Flood fill: doesn't do much on a continuously
	   variable tone jpeg original. */
	gdImageFill (im_out, 8, 8, blue);
	/* Polygon */
	points[0].x = 64;
	points[0].y = 0;
	points[1].x = 0;
	points[1].y = 128;
	points[2].x = 128;
	points[2].y = 128;
	gdImageFilledPolygon (im_out, points, 3, green);
	/* 2.0.12: Antialiased Polygon */
	gdImageSetAntiAliased (im_out, green);
	for (i = 0; (i < 3); i++) {
		points[i].x += 128;
	}
	gdImageFilledPolygon (im_out, points, 3, gdAntiAliased);
	/* Brush. A fairly wild example also involving a line style! */
	if (im_in) {
		int style[8];
		brush = gdImageCreateTrueColor (16, 16);
		gdImageCopyResized (brush, im_in,
		                    0, 0, 0, 0,
		                    gdImageSX (brush), gdImageSY (brush),
		                    gdImageSX (im_in), gdImageSY (im_in));
		gdImageSetBrush (im_out, brush);
		/* With a style, so they won't overprint each other.
		   Normally, they would, yielding a fat-brush effect. */
		style[0] = 0;
		style[1] = 0;
		style[2] = 0;
		style[3] = 0;
		style[4] = 0;
		style[5] = 0;
		style[6] = 0;
		style[7] = 1;
		gdImageSetStyle (im_out, style, 8);
		/* Draw the styled, brushed line */
		gdImageLine (im_out, 0, 255, 255, 0, gdStyledBrushed);
	}
	/* Text (non-truetype; see gdtestft for a freetype demo) */
	fonts[0] = gdFontGetTiny ();
	fonts[1] = gdFontGetSmall ();
	fonts[2] = gdFontGetMediumBold ();
	fonts[3] = gdFontGetLarge ();
	fonts[4] = gdFontGetGiant ();
	y = 0;
	for (i = 0; (i <= 4); i++) {
		gdImageString (im_out, fonts[i], 32, 32 + y, (unsigned char *) "hi",
		               red);
		y += fonts[i]->h;
	}
	y = 0;
	for (i = 0; (i <= 4); i++) {
		gdImageStringUp (im_out, fonts[i], 64 + y, 64,
		                 (unsigned char *) "hi", red);
		y += fonts[i]->h;
	}
	/* Random antialiased lines; coordinates all over the image,
	   but the output will respect a small clipping rectangle */
	gdImageSetClip (im_out, 0, gdImageSY (im_out) - 100,
	                100, gdImageSY (im_out));
	/* Fixed seed for reproducibility of results */
	srand (100);
	for (i = 0; (i < 100); i++) {
		int x1 = rand () % gdImageSX (im_out);
		int y1 = rand () % gdImageSY (im_out);
		int x2 = rand () % gdImageSX (im_out);
		int y2 = rand () % gdImageSY (im_out);
		gdImageSetAntiAliased (im_out, white);
		gdImageLine (im_out, x1, y1, x2, y2, gdAntiAliased);
	}
	/* Make output image interlaced (progressive, in the case of JPEG) */
	gdImageInterlace (im_out, 1);
	out = fopen ("demoout.png", "wb");
	/* Write PNG */
	gdImagePng (im_out, out);
	fclose (out);
	out = fopen ("demoout.gif", "wb");
	/* Write GIF (2.0.28) */
	gdImageGif (im_out, out);
	fclose (out);
	/* 2.0.12: also write a paletteized png comparable to the gif */
	out = fopen ("demooutp.png", "wb");
	gdImageTrueColorToPalette (im_out, 0, 256);
	gdImagePng (im_out, out);
	fclose (out);
	gdImageDestroy (im_out);
	if (im_in) {
		gdImageDestroy (im_in);
	}
#else
	fprintf(stderr, "No PNG library support.\n");
#endif /* HAVE_LIBPNG */
	return 0;
}