<?php
#error_reporting(0);
/* Usage :
*
* require_once('/path/to/gd-gradient-fill.php');
* $image = new gd_gradient_fill($width,$height,$direction,$startcolor,$endcolor,$step);
*
* Parameters :
* - width and height : integers, dimesions of your image.
* - direction : string, shape of the gradient.
* Can be : vertical, horizontal, rectangle (or square), ellipse, ellipse2, circle, circle2, diamond.
* - startcolor : string, start color in 3 or 6 digits hexadecimal.
* - endcolor : string, end color in 3 or 6 digits hexadecimal.
* - step : integer, optional, default to 0. Step that breaks the smooth blending effect.
* Returns a resource identifier.
*
* Examples :
*
* 1.
* require_once('/home/ozh/www/includes/gd-gradient-fill.php');
* $image = new gd_gradient_fill(200,200,'horizontal','#fff','#f00');
*
* 2.
* require_once('c:/iis/inet/include/gd-gradient-fill.php');
* $myimg = new gd_gradient_fill(80,20,'diamond','#ff0010','#303060');
*
*/
// Test it :
#$image = new gd_gradient_fill(400,200,'ellipse','#f00','#000',0);
class Gradient{
var $width;
var $height;
var $type;
var $start_colour;
var $end_colour;
var $step;
var $outfile;
var $image;
function setWidth($width){
$this->width = $width;
}
function setHeight($height){
$this->height = $height;
}
function setType($type){
$allowed = array('vertical', 'horizontal', 'rectangle', 'square', 'ellipse', 'ellipse2', 'circle', 'circle2', 'diamond');
if(in_array($dir, $allowed)){
$this->type = $dir;
} else {
$this->type = 'vertical';
}
}
function setStartColour($col){
$this->start_colour = $col;
}
function setEndColour($col){
$this->end_colour = $col;
}
function setStep($step){
$this->setp = intval(abs($step));
}
// Constructor. Creates, fills and returns an image
function Gradient(){ //$w,$h,$d,$s,$e,$step=0) {
$this->width = 100;
$this->height = 100;
$this->type = 'vertical';
$this->start_colour = '#ffffff';
$this->end_colour = '#0000ff';
$this->step = intval(abs(0));
// 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,$this->height);
} else {
die('Unable to create an image');
}*/
// Fill it
#$this->fill($this->image,$this->direction,$this->startcolor,$this->endcolor);
// Show it
#$this->display($this->image);
// Return it
#return $this->image;
}
function Generate($data = NULL, $outfile = NULL){
// Update variables if first parameter is array containing the details
if(is_array($data)){
if(isset($data['width'])){ $this->width = $data['width']; }
if(isset($data['height'])){ $this->height = $data['height']; }
if(isset($data['type'])){ $this->type = $data['type']; }
if(isset($data['start_colour'])){ $this->start_colour = $data['start_colour']; }
if(isset($data['end_colour'])){ $this->end_colour = $data['end_colour']; }
if(isset($data['step'])){ $this->step = intval(abs($data['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');
}
// Create image
$this->fill($this->image, $this->type, $this->start_colour, $this->end_colour);
if($outfile != NULL){
imagepng($this->image, $outfile);
} else {
header('Content-type: image/png');
imagepng($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($im);
} else {
die("Doh ! No graphical functions on this server ?");
}
return true;
}
// The main function that draws the gradient
function fill($im, $type, $start, $end){
switch($type){
case 'horizontal':
$line_numbers = imagesx($im);
$line_width = imagesy($im);
list($r1,$g1,$b1) = $this->hex2rgb($start);
list($r2,$g2,$b2) = $this->hex2rgb($end);
break;
case 'vertical':
$line_numbers = imagesy($im);
$line_width = imagesx($im);
list($r1,$g1,$b1) = $this->hex2rgb($start);
list($r2,$g2,$b2) = $this->hex2rgb($end);
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 = $height/2;
list($r1,$g1,$b1) = $this->hex2rgb($end);
list($r2,$g2,$b2) = $this->hex2rgb($start);
imagefill($im, 0, 0, imagecolorallocate( $im, $r1, $g1, $b1 ));
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 = $height/2;
list($r1,$g1,$b1) = $this->hex2rgb($end);
list($r2,$g2,$b2) = $this->hex2rgb($start);
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 = $rw = 1;
list($r1,$g1,$b1) = $this->hex2rgb($end);
list($r2,$g2,$b2) = $this->hex2rgb($start);
break;
case 'circle2':
$width = imagesx($im);
$height = imagesy($im);
$line_numbers = min($width,$height);
$center_x = $width/2;
$center_y = $height/2;
$rh = $rw = 1;
list($r1,$g1,$b1) = $this->hex2rgb($end);
list($r2,$g2,$b2) = $this->hex2rgb($start);
imagefill($im, 0, 0, imagecolorallocate( $im, $r1, $g1, $b1 ));
break;
case 'square':
case 'rectangle':
$width = imagesx($im);
$height = imagesy($im);
$line_numbers = max($width,$height)/2;
list($r1,$g1,$b1) = $this->hex2rgb($end);
list($r2,$g2,$b2) = $this->hex2rgb($start);
break;
case 'diamond':
list($r1,$g1,$b1) = $this->hex2rgb($end);
list($r2,$g2,$b2) = $this->hex2rgb($start);
$width = imagesx($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_r = NULL;
$old_g = NULL;
$old_b = NULL;
// old values :
if(isset($r)){ $old_r=$r; }
if(isset($g)){ $old_g=$g; }
if(isset($b)){ $old_b=$b; }
// new values :
$r = ( $r2 - $r1 != 0 ) ? intval( $r1 + ( $r2 - $r1 ) * ( $i / $line_numbers ) ): $r1;
$g = ( $g2 - $g1 != 0 ) ? intval( $g1 + ( $g2 - $g1 ) * ( $i / $line_numbers ) ): $g1;
$b = ( $b2 - $b1 != 0 ) ? intval( $b1 + ( $b2 - $b1 ) * ( $i / $line_numbers ) ): $b1;
// if new values are really new ones, allocate a new color, otherwise reuse previous color.
// There's a "feature" in imagecolorallocate that makes this function
// always returns '-1' after 255 colors have been allocated in an image that was created with
// imagecreate (everything works fine with imagecreatetruecolor)
if ( "$old_r,$old_g,$old_b" != "$r,$g,$b")
$fill = imagecolorallocate( $im, $r, $g, $b );
switch($type){
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;
}
}
?>