PHP Imagick文字加阴影(外发光)详解编程语言

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