class CropImageEffect

class CropImageEffect extends ResizeImageEffect {
    
    /**
     * {@inheritdoc}
     */
    public function applyEffect(ImageInterface $image) {
        [
            $x,
            $y,
        ] = explode('-', $this->configuration['anchor']);
        $x = image_filter_keyword($x, $image->getWidth(), $this->configuration['width']);
        $y = image_filter_keyword($y, $image->getHeight(), $this->configuration['height']);
        if (!$image->crop($x, $y, $this->configuration['width'], $this->configuration['height'])) {
            $this->logger
                ->error('Image crop failed using the %toolkit toolkit on %path (%mimetype, %dimensions)', [
                '%toolkit' => $image->getToolkitId(),
                '%path' => $image->getSource(),
                '%mimetype' => $image->getMimeType(),
                '%dimensions' => $image->getWidth() . 'x' . $image->getHeight(),
            ]);
            return FALSE;
        }
        return TRUE;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getSummary() {
        $summary = [
            '#theme' => 'image_crop_summary',
            '#data' => $this->configuration,
        ];
        $summary += parent::getSummary();
        return $summary;
    }
    
    /**
     * {@inheritdoc}
     */
    public function defaultConfiguration() {
        return parent::defaultConfiguration() + [
            'anchor' => 'center-center',
        ];
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildConfigurationForm(array $form, FormStateInterface $form_state) {
        $form = parent::buildConfigurationForm($form, $form_state);
        $form['anchor'] = [
            '#type' => 'radios',
            '#title' => $this->t('Anchor'),
            '#options' => [
                'left-top' => $this->t('Top left'),
                'center-top' => $this->t('Top center'),
                'right-top' => $this->t('Top right'),
                'left-center' => $this->t('Center left'),
                'center-center' => $this->t('Center'),
                'right-center' => $this->t('Center right'),
                'left-bottom' => $this->t('Bottom left'),
                'center-bottom' => $this->t('Bottom center'),
                'right-bottom' => $this->t('Bottom right'),
            ],
            '#theme' => 'image_anchor',
            '#default_value' => $this->configuration['anchor'],
            '#description' => $this->t('The part of the image that will be retained during the crop.'),
        ];
        return $form;
    }
    
    /**
     * {@inheritdoc}
     */
    public function submitConfigurationForm(array &$form, FormStateInterface $form_state) {
        parent::submitConfigurationForm($form, $form_state);
        $this->configuration['anchor'] = $form_state->getValue('anchor');
    }

}