Duplicating images using the Bitmap and BitmapData classes

original author : Peter deHaan

original source : Peter deHaan's blog

== quote from his blog ==
In a previous post (Finding a pixel’s color value using the Bitmap classes and getPixel()) we looked at copying an image so we could build a simple color-picker like app. In this post, we explore duplicating a loaded image and copying it into a TileList control. Each time you press the “Copy image” button, a new instance of the source image is created and added to the TileList control’s data provider.

As an added bonus, we also create a custom item renderer consisting of an HBox container, Image control, and a Label control.

Full code after the jump.

<?xml version="1.0" encoding="utf-8"?>

<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical" verticalAlign="middle" backgroundColor="white">

    <mx:Script>
        <![CDATA[
            import mx.collections.ArrayCollection;

            [Bindable]

            private var arrColl:ArrayCollection = new ArrayCollection();

            private function dupeImage(source:Image):void {

                var data:BitmapData = Bitmap(source.content).bitmapData;

                var bitmap:Bitmap = new Bitmap(data);

                arrColl.addItem({image:bitmap, label:"item #" + (arrColl.length + 1)});
            }
        ]]>

    </mx:Script>

    <mx:HBox>
        <mx:Panel title="Source image">

            <mx:HBox verticalAlign="middle" horizontalAlign="center" width="100%" height="100%">

                <mx:Image id="img1" source="assets/logo.png" />
            </mx:HBox>

            <mx:ControlBar>
                <mx:Button label="Copy image" click="dupeImage(img1)" />

            </mx:ControlBar>
        </mx:Panel>

        <mx:TileList id="tileList" dataProvider="{arrColl}" width="300" height="200" columnCount="4" verticalScrollPolicy="on">

            <mx:itemRenderer>
                <mx:Component>
                    <mx:VBox>
                        <mx:Image source="{data.image}" />

                        <mx:Label text="{data.label}" />
                    </mx:VBox>

                </mx:Component>
            </mx:itemRenderer>
        </mx:TileList>

    </mx:HBox>

</mx:Application>