Flash as drawing operation: Random cut bitmap experiment

Original: Ybzjllj.
Effect: Use the mouse to draw a random shape, drag the shape, from the original artwork cut out the plot area of the plot.
Note: Non-masking, feel better than mask simple.
Used: As drawing, Bitmap object, bitmap fill. Import Flash.display.BitmapData;
Import Flash.geom.Matrix;
Import a picture, put on the stage, become MC, instance named "original"
"MC" is used to draw inside.
var artwork: MovieClip, Mc:movieclip;
var draw line = false;//Draw Line Flag
var bmpimage:bitmapdata=new BitmapData (original image. _width, original image. _height);//Create Bitmap Object
Bmpimage.draw (original image, New Matrix ())////Map bitmap objects with "artwork"
When the mouse is pressed
Original artwork. Onpress = function () {
if (Mc.hittest (_xmouse, _ymouse, True)) {
Mc.startdrag (); If the mouse is on the MC, start dragging it
} else {
When the mouse is pressed, the mouse is not copied on the MC, start drawing Line
Draw line = true;
MC = This.createemptymovieclip ("MC", 1);//Create an empty MC, this action will also delete the original painted diagram, if you do not want to delete the original, use the array instead.
Mc.linestyle (1, 0xff0000); Line Style
Mc.beginbitmapfill (Bmpimage,new Matrix (), false); Identity Bitmap Fill Start
Mc.moveto (_xmouse-this._x, _ymouse-this._y); Move the drawing line from the beginning to this
}
};
Original artwork. OnMouseUp = function () {
if (draw line) {
Draw line = false;
Mc.endfill (); Fill End
} else {
Mc.stopdrag ();
}
};
Original artwork. OnMouseMove = function () {
if (draw line) {
Mc.lineto (_xmouse-this._x, _ymouse-this._y); If the drawing line status is true, move the mouse to draw a line
}
};