modules6,990 bytes total
<?
require_once 'color.php';
class Gradient {
var $width;
var $height;
var $colors;
var $vertColors;
var $drawMode; // where to draw into
function Gradient($colors) {
$this->colors = $colors;
//$this->vertColors= $vertColors;
$this->width = 300;
$this->height = 60;
}
function setSize($width, $height) {
$this->width = $width;
$this->height = $height;
}
function setDrawToBuffer() {
$this->drawMode = 'buffer';
}
function setVertColors($vertColors) {
$this->vertColors = $vertColors;
}
function draw($saveAs = null) {
$slicesX = count($this->colors) - 1;
$slicesY = count($this->vertColors) - 1;
$sliceWidth = $this->width / (count($this->colors) - 1);
$sliceHeight = $this->height / (count($this->vertColors) - 1);
$paletteImg = imagecreatetruecolor($this->width, $this->height);
//echo count($this->vertColors);
for ($slice = 0; $slice < count($this->colors) - 1; $slice++) {
$startColor = $this->colors[$slice];
$endColor = $this->colors[$slice + 1];
$diffColor = $endColor->difference($startColor);
$rInc = $diffColor->red;
$gInc = $diffColor->green;
$bInc = $diffColor->blue;
// calculate horizontal color change
$rInc /= $sliceWidth;
$gInc /= $sliceWidth;
$bInc /= $sliceWidth;
$r = $startColor->red;
$g = $startColor->green;
$b = $startColor->blue;
for ($x=$slice * $sliceWidth; $x < $slicesX * $sliceWidth; $x++) {
$currentColor = new Color($r, $g, $b);
for ($ySlice=0; $ySlice < $slicesY; $ySlice++) {
//$yColor = new Color($r, $g, $b);
$yStartColor = $this->vertColors[$ySlice];
$yEndColor = $this->vertColors[$ySlice+1];
$a = Color::blend($currentColor, $yStartColor);
$bb = Color::blend($currentColor, $yEndColor);
//list($a, $b, $c) = $yStartColor->difference($currentColor);
//$t = new Color($a, $b, $c);
$diffColor = $bb->difference($a);
$rIncY = $diffColor->red;
$gIncY = $diffColor->green;
$bIncY = $diffColor->blue;
$r1 = $a->red;
$g1 = $a->green;
$b1 = $a->blue;
// calculate vertical color intrement
$rIncY /= $sliceHeight;
$gIncY /= $sliceHeight;
$bIncY /= $sliceHeight;
for ($y=$ySlice * $sliceHeight; $y < ($ySlice+1) * $sliceHeight; $y++) {
$newColor = imagecolorallocate($paletteImg, round($r1), round($g1), round($b1));
//if ($newColor == -1) echo 'error';
imagesetpixel($paletteImg, $x, $y, $newColor);
$r1 += $rIncY;
$g1 += $gIncY;
$b1 += $bIncY;
}
}
$r += $rInc;
$g += $gInc;
$b += $bInc;
} // x slice
} // x slice loop
if ($this->drawMode == 'buffer')
return $paletteImg;
if (isset($saveAs)) {
imagejpeg($paletteImg, 'images/gradients/' . $saveAs);
}
header("Content-type: image/jpg");
imagejpeg($paletteImg);
}
}
$colors = null;
// set the number of colors
if (isset($_GET['numcolors_x']))
$numColorsX = $_GET['numcolors_x'];
else $numColorsX = 1;
if (isset($_GET['numcolors_y']))
$numColorsY = $_GET['numcolors_y'];
else $numColorsY = 2;
if (empty($_GET['gradientmode'])) $_GET['gradientmode'] = 'palette';
if (isset($_GET['gradientmode'])) {
switch ($_GET['gradientmode']) {
default:
case 'palette':
$red = new Color(255, 0, 0);
$orange = new Color(255, 128, 0);
$yellow = new Color(255, 255, 51);
$green = new Color(0, 153, 0);
$blue = new Color(0, 0, 255);
$purple = new Color(102, 0, 153);
$white = new Color(255, 255, 255);
$black = new Color(0, 0, 0);
//$red = new Color(255, 0, 0);
$vertColors = array($white, $black, $white);
$colors = array($red, $orange, $yellow, $green, $blue, $purple, $red);
break;
// let the program chose random colors
case 'random':
if (isset($_GET['randomseed'])) {
if ($_GET['randomseed'] == 'random')
srand(time());
else srand($_GET['randomseed']);
}
else
srand(time() * ($numColorsX + $numColorsY));
for ($i=0; $i < $numColorsX; $i++)
$colors[] = new Color(rand(0, 255), rand(0, 255), rand(0, 255));
$rcolors = array_reverse($colors);
$i = 0;
foreach($rcolors as $c) {
//if ($i)
array_push($colors, $c);
$i++;
}
for ($i=0; $i < $numColorsY; $i++)
$vertColors[] = new Color(rand(0, 255), rand(0, 255), rand(0, 255));
$rcolors = array_reverse($vertColors);
$i = 0;
foreach($rcolors as $c) {
//if ($i)
array_push($vertColors, $c);
$i++;
}
break;
// user specifys a starting color
case 'colorfade':
if (isset($_GET['startcolor'])) {
$startColorRGB = explode(',', $_GET['startcolor']);
//echo $_GET['startcolor'];
//print_r($startColorRGB);
$startColor = new Color($startColorRGB[0], $startColorRGB[1], $startColorRGB[2]);
$endColor = new Color($startColorRGB[0], $startColorRGB[1], $startColorRGB[2]);
if (isset($_GET['alpha']))
$endColor->changeBrightness($_GET['alpha']);
else
$endColor->changeBrightness(0.8);
$colors = array($startColor, $endColor, $startColor);
$vertColors = $colors;
}
break;
}
//print_r($colors);
$gradient = new Gradient($colors);
if (isset($vertColors)) $gradient->setVertColors($vertColors);
if (isset($_GET['width']))
$width = $_GET['width'];
if (isset($_GET['height']))
$height = $_GET['height'];
if (isset($width) && isset($height))
$gradient->setSize($width, $height);
if (isset($_GET['generate']))
$saveAs = $_GET['randomseed'] . '.jpg';
else $saveAs = null;
if ($_SERVER['PHP_SELF'] == '/gradient2.php')
$gradient->draw($saveAs);
}
?>
