Best way to get a part of a picture

Hi, I m doing a behavior with bitmaps but a little confused.

Objective:

(As shown in the attached picture)

I have a Movieclip with a static form on stage (Let´s for example... a star)

I would like to load an image (img1), then I would be able, rotation, zooming and panning of the image (img1).

Then I would only have the star but filled with the part of the image that has mounted this star.

I was trying to get the image bitmapData, then draw the star on the image... And in the end, compare the pixels of color and only get the ones I want... but I get a big mess with rotations, scaling, and the positions of the stars to exactly the place we need to draw the being...

Something tell´s me this I m missing a point and it would be easier...

Can someone give me sense?

It s a kind of mask, but I want to save this picture so only...

Thanks in advance!

extractStar.png

I'd do it:

(1) go and translate your image clip

(2) adjust the star under the mask

(3) once the mask applied, use BitmapData.draw to draw the image hidden in a new data bitmap

(4) TADA!

As far as I know, 'draw' should respect the masks? If not then you need to clip + mask inside an another DisplayObject and attract.  Some pseudo code (not tested and simplified):

// Parent object
var canvas : Sprite = new Sprite();
canvas.addChild( clip );
canvas.addChild( star );

// Manipulate your image
clip.rotation = 35;
clip.scaleX = clip.scaleY = 1.2;

// Set mask and position it
clip.mask = star;
star.x = 40;
star.y = 20;

// Create a bitmap data and draw to it
bitmapData = new BitmapData( Math.ceil(canvas.width), Math.ceil(canvas.height), true, 0x00000000 );
bitmapData.draw( canvas, ...... );

// You may need to use canvas.getBounds and create a matrix to get 'canvas' positioned correctly on the bitmapData

It will be useful,

Peter

Tags: Adobe AIR

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