ImagickKernel::fromBuiltIn

<?php
function renderKernel(ImagickKernel $imagickKernel) {
 $matrix = $imagickKernel->getMatrix();
 
 $imageMargin = 20;
 
 $tileSize = 20;
 $tileSpace = 4;
 $shadowSigma = 4;
 $shadowDropX = 20;
 $shadowDropY = 0;
 $radius = ($tileSize / 2) * 0.9;
 
 $rows = count($matrix);
 $columns = count($matrix[0]);
 
 $imagickDraw = new \ImagickDraw();
 $imagickDraw->setFillColor('#afafaf');
 $imagickDraw->setStrokeColor('none');
 
 $imagickDraw->translate($imageMargin, $imageMargin);
 $imagickDraw->push();
 ksort($matrix);
 
 foreach ($matrix as $row) {
 ksort($row);
 $imagickDraw->push();
 foreach ($row as $cell) {
 if ($cell !== false) {
 $color = intval(255 * $cell);
 $colorString = sprintf("rgb(%f, %f, %f)", $color, $color, $color);
 $imagickDraw->setFillColor($colorString);
 $imagickDraw->rectangle(0, 0, $tileSize, $tileSize);
 }
 $imagickDraw->translate(($tileSize + $tileSpace), 0);
 }
 $imagickDraw->pop();
 $imagickDraw->translate(0, ($tileSize + $tileSpace));
 }
 $imagickDraw->pop();
 $width = ($columns * $tileSize) + (($columns - 1) * $tileSpace);
 $height = ($rows * $tileSize) + (($rows - 1) * $tileSpace);
 $imagickDraw->push();
 $imagickDraw->translate($width/2 , $height/2);
 $imagickDraw->setFillColor('rgba(0, 0, 0, 0)');
 $imagickDraw->setStrokeColor('white');
 $imagickDraw->circle(0, 0, $radius - 1, 0);
 $imagickDraw->setStrokeColor('black');
 $imagickDraw->circle(0, 0, $radius, 0);
 $imagickDraw->pop();
 $canvasWidth = $width + (2 * $imageMargin); 
 $canvasHeight = $height + (2 * $imageMargin);
 $kernel = new \Imagick();
 $kernel->newPseudoImage(
 $canvasWidth,
 $canvasHeight,
 'canvas:none'
 );
 $kernel->setImageFormat('png');
 $kernel->drawImage($imagickDraw);
 
 /* create drop shadow on it's own layer */
 $canvas = $kernel->clone();
 $canvas->setImageBackgroundColor(new \ImagickPixel('rgb(0, 0, 0)'));
 $canvas->shadowImage(100, $shadowSigma, $shadowDropX, $shadowDropY);
 $canvas->setImagePage($canvasWidth, $canvasHeight, -5, -5);
 $canvas->cropImage($canvasWidth, $canvasHeight, 0, 0);
 
 /* composite original text_layer onto shadow_layer */
 $canvas->compositeImage($kernel, \Imagick::COMPOSITE_OVER, 0, 0);
 $canvas->setImageFormat('png');
 return $canvas;
}
function createFromBuiltin($kernelType, $kernelFirstTerm, $kernelSecondTerm, $kernelThirdTerm) {
 $string = '';
 if ($kernelFirstTerm != false && strlen(trim($kernelFirstTerm)) != 0) {
 $string .= $kernelFirstTerm;
 if ($kernelSecondTerm != false && strlen(trim($kernelSecondTerm)) != 0) {
 $string .= ','.$kernelSecondTerm;
 if ($kernelThirdTerm != false && strlen(trim($kernelThirdTerm)) != 0) {
 $string .= ','.$kernelThirdTerm;
 }
 }
 }
 $kernel = ImagickKernel::fromBuiltIn(
 $kernelType,
 $string
 );
 return $kernel;
}
 
function fromBuiltin($kernelType, $kernelFirstTerm, $kernelSecondTerm, $kernelThirdTerm) {
 $diamondKernel = createFromBuiltin($kernelType, $kernelFirstTerm, $kernelSecondTerm, $kernelThirdTerm);
 $imagick = renderKernel($diamondKernel);
 header("Content-Type: image/png");
 echo $imagick->getImageBlob();
}
fromBuiltin(\Imagick::KERNEL_DIAMOND, 2, false, false);
?>