PHP Imagick文字加阴影(外发光)

PHP Imagick文字加阴影(外发光)

$canvas = new \Imagick();
        $canvas->newImage(500, 200, 'white');
        $canvas->setImageFormat('png');

        $text = new \Imagick();
        $text->newImage(500, 200, 'none');
        $text->setImageFormat('png');

        $draw = new \ImagickDraw();
        $draw->setFillColor(new \ImagickPixel('#f00'));
        $draw->setFontSize(50);
        $draw->annotation(100, 60, 'welcome');
        $text->drawImage($draw);

        $draw->setFillColor(new \ImagickPixel('#fff'));
        $draw->setFontSize(50);
        $draw->annotation(100, 120, 'welcome');
        $text->drawImage($draw);

        $shadow_layer = $text->clone();
        $shadow_layer->setImageBackgroundColor(new \ImagickPixel('#555'));
        $shadow_layer->shadowImage(80, 0.8, 0, 0);
        $shadow_layer->compositeImage($text, \Imagick::COMPOSITE_OVER, 0, 0);
        $canvas->compositeImage($shadow_layer, \imagick::COMPOSITE_DEFAULT, 0, 0);
        $canvas->writeImage("test_0.jpg"); //直接写入test_0.jpg文件
       header("Content-type: image/{$canvas->getImageFormat()}");
       echo $canvas->getImageBlob();

ps:
drawImage $text->drawImage($draw); 这个$draw是文字对象 $text可以是图片可以是空白画布
setImageBackgroundColor 设置阴影颜色
shadowImage 第一个参数是透明度0~255 第二个参数就是值越大就是扩散越大 第三和第四就是x和y的阴影位移
compositeImage 这个是合并图片
$shadow_layer->compositeImage($text, Imagick::COMPOSITE_OVER, 0, 0 ); //$text合并到$shadow_layer
$canvas->compositeImage($shadow_layer, imagick::COMPOSITE_DEFAULT, 0, 0); //$shadow_layer 合并到$canvas

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