Flash :: Copy Channel (BitmapData Class) - Eraser Tool
May 3, 2011
I am developing an application similar to MS Paint. I am building a Flash Paint application. The basic structure is this. I have two layers namely topLayer_mc and bottomLayer_mc. The actual vector drawing is drawn on the top layer and onmouseUp of the tool, a bitmap copy of the vector graphics on the top layer is taken and added as a bitmap to the bottom layer. The top layer is cleared subsequently. It is working for the pencil tool.
Now I need to create an eraser tool. This is where things get tricky. In the application there is an option to save the image as png, so alpha has top be preserved. So the coventional method of draw a brush using the vector and using the draw method of bitmap will not work. Of course, on a visual level it would work if the brush drawn using the vector is to have the same color as that of the background. The eraser's are rectangular in shape.
The technique I am tring to use is to use the copyChannel method of BitmapData class. Specify a channels (say GREEN channel )hex value as 00 and make it as the source. Then make the destination channel ALPHA. I got it working without using movieclips as shown below.
[Code]....
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Sep 26, 2010
I did make a eraser tool. But once I begin to erase a layer, the background layer is visible. I want the layer just below the topmost layer to be visible.
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Here is the code I used: The comment entry shows that, I have tried that possiblity.
import flash.display.BitmapData;
var linkageId:String = "myimage";
var myBitmapData:BitmapData = BitmapData.loadBitmap(linkageId);
[Code]...
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[Code]......
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rissa._x=Stage.width/2;
rissa._y=Stage.height/2;[code].....
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**Error** Scene=Scene 1, layer=Layer 2, frame=1:Line 7: The class or interface 'BitmapData.loadBitmap' could not be loaded.
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Total ActionScript Errors: 1 Reported Errors: 1
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[Code]....
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[Code]...
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[Code]...
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[code].....
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