Create a kernel from a builtin in kernel

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- Create a kernel from a builtin in kernel

# ImagickKernel::fromBuiltIn

(PECL imagick >= 3.3.0)

ImagickKernel::fromBuiltIn — Create a kernel from a builtin in kernel

### Description

public static ImagickKernel::fromBuiltin(int `$kernelType`, string `$kernelString`): ImagickKernel

Create a kernel from a builtin in kernel. See http://www.imagemagick.org/Usage/morphology/#kernel for examples. Currently the 'rotation' symbols are not supported. Example: $diamondKernel = ImagickKernel::fromBuiltIn(\Imagick::KERNEL_DIAMOND, "2");

### Parameters

`kerneltype`

  The type of kernel to build e.g. \Imagick::KERNEL_DIAMOND

`kernelString`

  A string that describes the parameters e.g. "4,2.5"

### Return Values

### Examples

Example #1 ImagickKernel::fromBuiltin()

    <?phpfunction 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);?>