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HOWTO: Horizontal color gradient in PHP using GD library
< Previous | Back to Listdigitela at December 30, 2005
Better than Google AdSense!
A very important function missing in GD library is the color gradient. Here is simple function that fills image with horizontal color gradient:
<?php
function imagecolorgradient($im, $x1, $y1, $height, $width,
$left_color, $right_color)
{
$color0=($left_color[0]-$right_color[0])/$width;
$color1=($left_color[1]-$right_color[1])/$width;
$color2=($left_color[2]-$right_color[2])/$width;
for ($i=0;$i<=$width;$i++)
{
$red=$left_color[0]-floor($i*$color0);
$green=$left_color[1]-floor($i*$color1);
$blue=$left_color[2]-floor($i*$color2);
$col= imagecolorallocate($im, $red, $green, $blue);
imageline($im, $x1+$i, $y1, $x1+$i, $y1+$height, $col);
}
}
?> Is not a complicated one, but anyway here is simple example of its usage:
<?php
$height = 20;
$width = 200;
$left_color = array(255, 255, 0);
$right_color = array(255, 0, 0);
$im = imagecreatetruecolor($width, $height);
imagecolorgradient($im, 0, 0, $height, $width, $left_color, $right_color);
header('Content-type: image/png');
imagepng($im);
imagedestroy($im);
?> As a result you should see in your browser next image. Could be very usefull in bar graphs and design.
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