[Hauts]

import flash.display.Shape;
import flash.display.BitmapData;
import flash.display.Bitmap;
import flash.events.MouseEvent;
 
var canDraw:Boolean = false;
var shape:Shape = new Shape();
var bitmapData:BitmapData = new BitmapData(2000,1000,true,0x000000);
var bitmap:Bitmap = new Bitmap(bitmapData);
 
addChild(bitmap);
addChild(shape);
 
stage.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHadler);
stage.addEventListener(MouseEvent.MOUSE_UP, mouseUpHadler);
stage.addEventListener(MouseEvent.MOUSE_MOVE, mouseMoveHadler);
 
function mouseDownHadler(e:MouseEvent):void {
	canDraw = true;
	shape.graphics.lineStyle(5,0x000000);
	shape.graphics.moveTo(mouseX, mouseY);
}
function mouseUpHadler(e:MouseEvent):void {
	canDraw = false;
	bitmapData.draw(shape);
	shape.graphics.clear();
}
function mouseMoveHadler(e:MouseEvent):void {
	if (canDraw) {
		shape.graphics.lineTo(mouseX, mouseY);
		e.updateAfterEvent();
	}
}

Вот мой вариант, попробуйте.

draw_example.swf   (1.2 Кб)