Mega Code Archive
Display a bar chart based on random values
<![CDATA[
<?
// bars.php3 - Bar chart on gif image
// Note: uses the gd library
// This code will display a bar chart based on random values
// Different colors are used to display bars and a gif images
// is used for the background. Use the following link to include
// the example into your web-site
// <img src="./bars.php3" border="0">
//
// The background image can be found at
Header( "Content-type: image/gif");
Header( "Expires: Mon, 17 Aug 1998 12:51:50 GMT");
$im = imagecreatefromgif( "gradient.gif");
// Allocate colors
$red=ImageColorAllocate($im,255,0,0);
$green=ImageColorAllocate($im,0,255,0);
$blue=ImageColorAllocate($im,0,0,255);
$yellow=ImageColorAllocate($im,255,255,0);
$cyan=ImageColorAllocate($im,0,255,255);
// Determine size of image
$x=imagesx($im);
$y=imagesy($im);
// Initialize random number generator
srand(mktime());
// Create some bars
$v=rand(); $v=$v/32768*200;
ImageFilledRectangle($im,10,200-$v,60,200,$red);
$v=rand(); $v=$v/32768*200;
ImageFilledRectangle($im,70,200-$v,120,200,$green);
$v=rand(); $v=$v/32768*200;
ImageFilledRectangle($im,130,200-$v,180,200,$blue);
$v=rand(); $v=$v/32768*200;
ImageFilledRectangle($im,190,200-$v,240,200,$yellow);
$v=rand(); $v=$v/32768*200;
ImageFilledRectangle($im,250,200-$v,300,200,$cyan);
// Display modified image
ImageGif($im);
// Release allocated ressources
ImageDestroy($im);
?>
]]>