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Posted by monomaniac21 on 02/18/06 15:23
Hi all!
Ive got a very simple page shown below to draw a line graph and I need
some help, how do can i label each point on the X and the Y axis? The
lines are drawn with an imageline function, any ideas?
Kind regards
Marc
<?
// Add values to the graph
$graphValues=array(0,80,23,11,190,245,50,80,111,240,55);
// Define .PNG image
header("Content-type: image/png");
$imgWidth=250;
$imgHeight=250;
// Create image and define colors
$image=imagecreate($imgWidth, $imgHeight);
$colorWhite=imagecolorallocate($image, 255, 255, 255);
$colorGrey=imagecolorallocate($image, 192, 192, 192);
$colorBlue=imagecolorallocate($image, 0, 0, 255);
// Create GREY border around image
imageline($image, 0, 0, 0, 250, $colorGrey);
imageline($image, 0, 0, 250, 0, $colorGrey);
imageline($image, 249, 0, 249, 249, $colorGrey);
imageline($image, 0, 249, 249, 249, $colorGrey);
// Create grid using the imageline function to draw lines on the x and
the y (in grey)
for ($i=1; $i<11; $i++){
imageline($image, $i*25, 0, $i*25, 250, $colorGrey);
imageline($image, 0, $i*25, 250, $i*25, $colorGrey);
}
// Create line graph by looping through the data
for ($i=0; $i<10; $i++){
imageline($image, $i*25, (250-$graphValues[$i]), ($i+1)*25,
(250-$graphValues[$i+1]), $colorBlue);
}
// Output graph and clear image from memory
imagepng($image);
imagedestroy($image);
?>
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