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Php Programming Code Examples

Php > Graphics Code Examples

Gradient Image

Gradient Image <?php /* Appears to be a glitch in images greater than 250px high - never reaches final colour? */ class grad { var $height = 100; var $width = 100; var $startcol = '000000'; var $endcol = 'ffffff'; function draw() { $im = imagecreate ($this->width, $this->height); $b = hexdec($this->startcol); $c = hexdec($this->endcol); $sr = ($b & 0xFF0000) >> 16; $sg = ($b & 0xFF00) >> 8; $sb = ($b & 0xFF); $er = ($c & 0xFF0000) >> 16; $eg = ($c & 0xFF00) >> 8; $eb = ($c & 0xFF); $r = $er - $sr; $g = $eg - $sg; $b = $eb - $sb; for ($line = 0; $line < $this->height; $line++) { $cRed = (($sr += ($r / $this->height)) < 0) ? (int)0: (int)$sr; $cGreen = (($sg += ($g / $this->height)) < 0) ? (int)0: (int)$sg; $cBlue = (($sb += ($b / $this->height)) < 0) ? (int)0: (int)$sb; $clr[$line] = imagecolorallocate($im, $cRed, $cGreen, $cBlue); imageline($im, 0, $line, ($this->width - 1), $line, $clr[$line]); } imagejpeg($im); } } Header("Content-type: image/jpg"); $img = new grad; if (isset($height)) $img->height = $height; if (isset($width)) $img->width = $width; if (isset($startcol)) $img->startcol = $startcol; if (isset($endcol)) $img->endcol = $endcol; $img->draw(); ?>