Imbo\Image\Transformation\Canvas::transform PHP Метод

    public function transform(EventInterface $event)
    {
        $image = $event->getArgument('image');
        $params = $event->getArgument('params');
        $width = !empty($params['width']) ? (int) $params['width'] : $image->getWidth();
        $height = !empty($params['height']) ? (int) $params['height'] : $image->getHeight();
        $mode = !empty($params['mode']) ? $params['mode'] : $this->mode;
        $x = !empty($params['x']) ? (int) $params['x'] : $this->x;
        $y = !empty($params['y']) ? (int) $params['y'] : $this->y;
        $bg = !empty($params['bg']) ? $this->formatColor($params['bg']) : $this->bg;
        try {
            // Clone the original that we will move back onto the canvas
            $original = clone $this->imagick;
            // Clear the original and make the canvas
            $this->imagick->clear();
            $this->imagick->newImage($width, $height, $bg);
            $this->imagick->setImageFormat($image->getExtension());
            $existingWidth = $image->getWidth();
            $existingHeight = $image->getHeight();
            if ($existingWidth > $width || $existingHeight > $height) {
                // The existing image is bigger than the canvas and needs to be cropped
                $cropX = 0;
                $cropY = 0;
                $cropWidth = $width;
                $cropHeight = $height;
                if ($existingWidth > $width) {
                    if ($mode === 'center' || $mode === 'center-x') {
                        $cropX = (int) ($existingWidth - $width) / 2;
                    }
                } else {
                    $cropWidth = $existingWidth;
                }
                if ($existingHeight > $height) {
                    if ($mode === 'center' || $mode === 'center-y') {
                        $cropY = (int) ($existingHeight - $height) / 2;
                    }
                } else {
                    $cropHeight = $existingHeight;
                }
                // Crop the original
                $original->cropImage($cropWidth, $cropHeight, $cropX, $cropY);
            }
            // Figure out the correct placement of the image based on the placement mode. Use the
            // size from the imagick image when calculating since the image may have been cropped
            // above.
            $existingSize = $original->getImageGeometry();
            if ($mode === 'center') {
                $x = ($width - $existingSize['width']) / 2;
                $y = ($height - $existingSize['height']) / 2;
            } else {
                if ($mode === 'center-x') {
                    $x = ($width - $existingSize['width']) / 2;
                } else {
                    if ($mode === 'center-y') {
                        $y = ($height - $existingSize['height']) / 2;
                    }
                }
            }
            // Paste existing image into the new canvas at the given position
            $this->imagick->compositeImage($original, Imagick::COMPOSITE_DEFAULT, $x, $y);
            // Store the new image
            $size = $this->imagick->getImageGeometry();
            $image->setWidth($size['width'])->setHeight($size['height'])->hasBeenTransformed(true);
        } catch (ImagickException $e) {
            throw new TransformationException($e->getMessage(), 400, $e);
        } catch (ImagickPixelException $e) {
            throw new TransformationException($e->getMessage(), 400, $e);
        }
    }