FieldtypeCropImage.module

<?php
class FieldtypeCropImage extends FieldtypeImage {

        public static function getModuleInfo() {
                return array(
                        'title' => 'Images with cropping',
                        'version' => 100,
                        'summary' => 'Field that stores one or more GIF, JPG, or PNG images',
                        );
        }

        public function init() {
                $this->addHook('Pageimage::getThumb', $this, 'getThumb');  
        }

        public function getThumb(HookEvent $event) {
				
				$thumbFound = false;
                $thumb = $event->arguments[0];

                $crops = wire('modules')->get('ProcessCropImage')->crops;

				$crops_a = explode("\n", $crops); // ie. thumbname,200,200 (name,width,height)

				foreach($crops_a as $crop) {
					$crop = explode(",", $crop);
					if ($crop[0] == $thumb) {
						$this->w = (int) $crop[1];
						$this->h = (int) $crop[2];
						$thumbFound = true;
						break;
					}
				}
				
				if ($thumbFound === false) {
					throw new WireException("There is no thumb called: $thumb"); 
					return;
				}
				
				if ($this->w < 1 || $this->h < 1) {
					throw new WireException("Width and/or height not found for thumb: $thumb"); 
					return;
				}				

				$prefix = $this->sanitizer->name($thumb);
                $img = $event->object;
                $imgPath = $img->pagefiles->path . $prefix . "_" . $img->basename;
                $imgUrl = $img->pagefiles->url . $prefix . "_" . $img->basename;

				// We have a file, that is probably ok...
                if(is_file($imgPath)) {
					
					// But we check if the size matches for desired and resize if not
					$sizer = new ImageSizer($imgPath);
					if ($this->w != $sizer->getWidth() || $this->h != $sizer->getHeight()) {
						$this->_copyAndResize($img, $imgPath);
					}
					 
					// And finally we return the url
					$event->return = $imgUrl;
                }
				
				// Image not found, we take basic crop from original
				else {
					$this->_copyAndResize($img, $imgPath);
					$event->return = $imgUrl;
                }
				return true;
        }
		
		public function install() {
			parent::___install();
			$this->modules->get('ProcessCropImage');
			$this->modules->get('InputfieldCropImage');
		}
		
		private function _copyAndResize($img, $imgPath) {
			if(@copy($img->pagefiles->path . $img->basename, $imgPath)) {
				$sizer = new ImageSizer($imgPath); 
				$sizer->resize($this->w, $this->h);						
			}
		}
}