About blending modes 539
var mclListener:Object = new Object();
mclListener.onLoadInit = function(target_mc:MovieClip) {
var blendModeClip:MovieClip =
target_mc.createEmptyMovieClip("blendModeType_mc", 20);
with (blendModeClip) {
beginFill(0x999999);
moveTo(0, 0);
lineTo(target_mc._width / 2, 0);
lineTo(target_mc._width / 2, target_mc._height);
lineTo(0, target_mc._height);
lineTo(0, 0);
endFill();
}
target_mc._x = (Stage.width - target_mc._width) / 2;
target_mc._y = (Stage.height - target_mc._height) / 2;
blendModeClip.blendMode = blendMode_cb.value;
};
this.createEmptyMovieClip("img_mc", 10);
var img_mcl:MovieClipLoader = new MovieClipLoader();
img_mcl.addListener(mclListener);
img_mcl.loadClip("http://www.helpexamples.com/flash/images/image1.jpg",
img_mc);
function cbListener(eventObj:Object):Void {
img_mc.blendModeType_mc.blendMode = eventObj.target.value;
}
blendMode_cb.addEventListener("change", cbListener);
This ActionScript code populates the combo box with each type of blending mode, so the
user can view each effect on the dynamically loaded image. A listener object is created,
which is used with a MovieClipLoader instance. The listener object defines a single event
listener,
onLoadInit, which is invoked when the image is completely downloaded and is
initialized by Flash. The event listener creates a new movie clip named
blendModeType_mc, and uses the Drawing API to draw a rectangular shape over the left
half of the image. The currently selected blending mode for the ComboBox instance is
then applied to the
blendModeType_mc movie clip.
The rest of the code sets up the MovieClipLoader instance, which is responsible for
loading the specified image into a movie clip on the Stage. Finally, a listener is defined for
the
blendMode_cb ComboBox instance, which applies the selected blending mode
whenever a new item is selected from the ComboBox instance.
4. Select Control > Test Movie to test the document.
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