Simple Image Cropping with Flex

Here is a simple, pure as3, image cropper I wrote for Flex. I’ll try do a post later in the week describing how to use it in Flash cs3 and cs4.

[kml_flashembed publishmethod=”static” fversion=”9.0.0″ useexpressinstall=”true” replaceId=”flex_image_crop” movie=”” width=”640″ height=”458″ targetclass=”flashmovie”]

screenshot for people without flash



  • Very Simple
  • Allows you to set min and max values for height and width
  • Holding shift key keeps aspect ratio

You currently have to do the cropping on your own, either in flash or server side. I will followup later with examples of how to do that.

To embed this into you application, all you have to do is:

import com.wirelust.imagecrop.ImageCrop;
import com.wirelust.imagecrop.CropBox;
private var imageCrop:ImageCrop = new ImageCrop();
private function onCreationComplete():void {
	// imageBox is an mx:HBox in my mxml
	var crop:CropBox = imageCrop.cropBox;
	// Set up the initial crop
	crop.cropX = 178;
	crop.cropY = 187;
	crop.cropWidth = 249;
	crop.cropHeight = 219;

You can then listen for CropBox.EVENT_CHANGED to get the dimensions of the box as it changes:

private function onCreationComplete():void {
	// snipped ...
	crop.addEventListener(CropBox.EVENT_CHANGED, onCropChanged);
private function onCropChanged(event:Event):void {
	if (imageCrop.cropBox != null) {
		xValue.text = imageCrop.cropBox.cropX.toString();
		yValue.text = imageCrop.cropBox.cropY.toString();
		widthValue.text = imageCrop.cropBox.cropWidth.toString();
		heightValue.text = imageCrop.cropBox.cropHeight.toString();


 Download source code