/
gd-rg.php
195 lines (176 loc) · 7.17 KB
/
gd-rg.php
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<?php
/**
* This class is originally from here: http://planetozh.com/download/gd-gradient-fill.php
*
* It was then modified by StackOverflow user Justin (http://stackoverflow.com/users/265575/justin)
* ..in this question: http://stackoverflow.com/questions/6615602/radial-gradients-with-opacity-in-php
* ..to support alpha, and uploaded here: http://codepad.org/1eZ3Km0J/fork .
*
* Only a couple of changes were needed to use this class with the heatmap lib.
*
*/
class gd_gradient_alpha {
// Constructor. Creates, fills and returns an image
function gd_gradient_alpha($w,$h,$d,$rgb,$as,$ae,$step=0) {
$this->width = $w;
$this->height = $h;
$this->direction = $d;
$this->color = $rgb;
$this->alphastart = $as;
$this->alphaend = $ae;
$this->step = intval(abs($step));
// Attempt to create a blank image in true colors, or a new palette based image if this fails
if (function_exists('imagecreatetruecolor')) {
$this->image = imagecreatetruecolor($this->width,$this->height);
} elseif (function_exists('imagecreate')) {
$this->image = imagecreate($this->width,$this->height);
} else {
die('Unable to create an image');
}
imagealphablending($this->image, false);
imagesavealpha($this->image, true);
// Fill it
$this->fillalpha($this->image,$this->direction,$this->color,$this->alphastart,$this->alphaend);
// Show it
//$this->display($this->image);
// Return it
//return $this->image;
}
function get_image() {
return $this->image;
}
// Displays the image with a portable function that works with any file type
// depending on your server software configuration
function display ($im) {
if (function_exists("imagepng")) {
header("Content-type: image/png");
imagepng($im);
}
elseif (function_exists("imagegif")) {
header("Content-type: image/gif");
imagegif($im);
}
elseif (function_exists("imagejpeg")) {
header("Content-type: image/jpeg");
imagejpeg($im, "", 0.5);
}
elseif (function_exists("imagewbmp")) {
header("Content-type: image/vnd.wap.wbmp");
imagewbmp($im);
} else {
die("Doh ! No graphical functions on this server ?");
}
return true;
}
// The main function that draws the gradient
function fillalpha($im,$direction,$rgb,$as,$ae) {
list($r,$g,$b) = $this->hex2rgb($rgb);
$a1 = $this->a2sevenbit($as);
$a2 = $this->a2sevenbit($ae);
switch($direction) {
case 'horizontal':
$line_numbers = imagesx($im);
$line_width = imagesy($im);
break;
case 'vertical':
$line_numbers = imagesy($im);
$line_width = imagesx($im);
break;
case 'ellipse':
$width = imagesx($im);
$height = imagesy($im);
$rh=$height>$width?1:$width/$height;
$rw=$width>$height?1:$height/$width;
$line_numbers = min($width,$height);
$center_x = $width/2;
$center_y = $height/2;
imagefill($im, 0, 0, imagecolorallocatealpha($im, $r, $g, $b, $a1));
break;
case 'ellipse2':
$width = imagesx($im);
$height = imagesy($im);
$rh=$height>$width?1:$width/$height;
$rw=$width>$height?1:$height/$width;
$line_numbers = sqrt(pow($width,2)+pow($height,2));
$center_x = $width/2;
$center_y = $height/2;
break;
case 'circle':
$width = imagesx($im);
$height = imagesy($im);
$line_numbers = sqrt(pow($width,2)+pow($height,2));
$center_x = $width/2;
$center_y = $height/2;
$rh = $rw = 1;
break;
case 'circle2':
$width = imagesx($im);
$height = imagesy($im);
$line_numbers = min($width,$height);
$center_x = $width/2;
$center_y = $height/2;
$rh = $rw = 1;
imagefill($im, 0, 0, imagecolorallocatealpha($im, $r, $g, $b, $a1));
break;
case 'square':
case 'rectangle':
$width = imagesx($im);
$height = imagesy($im);
$line_numbers = max($width,$height)/2;
break;
case 'diamond':
$width = imagesx($im);
$height = imagesy($im);
$rh=$height>$width?1:$width/$height;
$rw=$width>$height?1:$height/$width;
$line_numbers = min($width,$height);
break;
default:
}
for ( $i = 0; $i < $line_numbers; $i=$i+1+$this->step ) {
$old_a = ( empty($a) ) ? $a2 : $a;
$a = ( $a2 - $a1 != 0 ) ? intval( $a1 + ( $a2 - $a1 ) * ( $i / $line_numbers ) ): $a1;
if ( "$old_a" != "$a") {
$fill = imagecolorallocatealpha( $im, $r, $g, $b, $a );
}
switch($direction) {
case 'vertical':
imagefilledrectangle($im, 0, $i, $line_width, $i+$this->step, $fill);
break;
case 'horizontal':
imagefilledrectangle( $im, $i, 0, $i+$this->step, $line_width, $fill );
break;
case 'ellipse':
case 'ellipse2':
case 'circle':
case 'circle2':
imagefilledellipse ($im,$center_x, $center_y, ($line_numbers-$i)*$rh, ($line_numbers-$i)*$rw,$fill);
break;
case 'square':
case 'rectangle':
imagefilledrectangle ($im,$i*$width/$height,$i*$height/$width,$width-($i*$width/$height), $height-($i*$height/$width),$fill);
break;
case 'diamond':
imagefilledpolygon($im, array (
$width/2, $i*$rw-0.5*$height,
$i*$rh-0.5*$width, $height/2,
$width/2,1.5*$height-$i*$rw,
1.5*$width-$i*$rh, $height/2 ), 4, $fill);
break;
default:
}
}
}
// #ff00ff -> array(255,0,255) or #f0f -> array(255,0,255)
function hex2rgb($color) {
$color = str_replace('#','',$color);
$s = strlen($color) / 3;
$rgb[]=hexdec(str_repeat(substr($color,0,$s),2/$s));
$rgb[]=hexdec(str_repeat(substr($color,$s,$s),2/$s));
$rgb[]=hexdec(str_repeat(substr($color,2*$s,$s),2/$s));
return $rgb;
}
function a2sevenbit($alpha) {
return (abs($alpha - 255) >> 1);
}
}