(PECL imagick >= 3.3.0)
ImagickKernel::fromMatrix — 从 2D 值矩阵创建内核
从 2D 值矩阵创建内核。每个值应该是一个浮点数（如果元素应该被使用）或者 'false'（如果元素应该被跳过）。对于两个维度上大小为奇数的矩阵，原点像素将默认为内核的中心。对于所有其他内核大小，必须指定原点像素。
array定义内核的值矩阵（即二维数组）。每个元素应该是一个浮点值，或者 FALSE，如果该元素不应该被内核使用。
array内核的哪个元素应该用作原点像素。例如，对于一个 3x3 矩阵，将原点指定为 [2, 2] 将指定右下角元素应该作为原点像素。
生成的 ImagickKernel。
示例 #1 ImagickKernel::fromMatrix()
<?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 createFromMatrix() {
$matrix = [
[0.5, 0, 0.2],
[0, 1, 0],
[0.9, 0, false],
];
$kernel = \ImagickKernel::fromMatrix($matrix);
return $kernel;
}
function fromMatrix() {
$kernel = createFromMatrix();
$imagick = renderKernel($kernel);
header("Content-Type: image/png");
echo $imagick->getImageBlob();
}
?>