manewcActionscript Snippets

APE Project - Step 3 - Performance Updates

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I decided to start cleaning up some issues that our code currently posseses. One being that rectangles can be drawn in any area of the stage, so I limited it so if the user scrolls within the area of the buttons that a rectangle will not be drawn. The second issue is that the more circles you add to the movie, the more processor intensive the movie becomes - so we need a way to essentially clean the stage. So with a few more buttons, the updated movie is below.

The Main Document Class:

package {
	import flash.display.Sprite;
	import flash.display.Shape;
	import flash.events.MouseEvent;
	import flash.events.Event;
	import flash.geom.Rectangle;
	import fl.controls.Button;
	import org.cove.ape.*;

	public class Main extends Sprite {

		private var beginX:Number; // top left x position
		private var beginY:Number; // top left y position
       	private var endX:Number; // bottom right x position
       	private var endY:Number; // bottom right y position  

		private var dynRect:RectangleParticle;
		private var circle:CircleParticle;
		private var circleGroup:Group;
        private var defaultGroup:Group;  

		public function Main()
		{
			init();
		}

		private function init():void
		{
			stage.frameRate = 55;

            // Initialize the engine. The argument here is the time step value.
            // Higher values scale the forces in the sim, making it appear to run
            // faster or slower. Lower values result in more accurate simulations.
            APEngine.init(1/4);  

            // set up the default diplay container
            APEngine.container = this;  

            APEngine.addMasslessForce(new Vector(0,8));  

            defaultGroup = new Group();  

            defaultGroup.collideInternal = true;

			circleGroup = new Group();
			circleGroup.collideInternal = true;

			var rect:RectangleParticle = new RectangleParticle(345, 680, 710, 40, 0, true);
            defaultGroup.addParticle(rect);  

            APEngine.addGroup(defaultGroup);
			APEngine.addGroup(circleGroup);

			// make the groups collidable
			defaultGroup.addCollidable(circleGroup);

			addEventListener(Event.ENTER_FRAME, run);

			stage.addEventListener(MouseEvent.MOUSE_DOWN, beginRectDraw);
			stage.addEventListener(MouseEvent.MOUSE_UP, stopRectDraw);

			// build the UI
			buildUI();
		}

		private function beginRectDraw(m:MouseEvent):void
       	{
			beginX = mouseX;
			beginY = mouseY;
       	}

		private function stopRectDraw(m:MouseEvent):void
       	{
			// set the end points
           	endX = mouseX;
		   	endY = mouseY;

			// remove the listeners
			stage.addEventListener(MouseEvent.MOUSE_DOWN, beginRectDraw);
			stage.addEventListener(MouseEvent.MOUSE_UP, stopRectDraw);

			// now draw the rectangle
			drawRectangle();
		}

		private function drawRectangle():void
		{
			if ( beginY < 660 && endY < 660 )
			{
				dynRect = new RectangleParticle(beginX + ( (endX - beginX)/2 ), beginY + ((endY - beginY)/2), endX - beginX, endY - beginY, 0, true);
            	defaultGroup.addParticle(dynRect);
			}
		}

		private function addBall( m:MouseEvent ):void
        {
            circle = new CircleParticle(Math.random() * stage.stageWidth, Math.random() * 100, Math.random() * 25 + 5);
            circleGroup.addParticle(circle);
        }

		private function run(e:Event):void
        {
            APEngine.step();
            APEngine.paint();
        }

		private function removeLastBall( m:MouseEvent ):void
		{
			if ( circle ) circle.cleanup();
		}

		private function clearBoard( m:MouseEvent ):void
		{
			APEngine.removeGroup(defaultGroup);
			APEngine.removeGroup(circleGroup);
			init();

		}

		private function buildUI():void
		{

			// NEW BUTTONS
            var btnAddBall:Button = new Button();
            btnAddBall.width = 65;
            btnAddBall.height = 25;
            btnAddBall.move ( 5, stage.stageHeight - 20 - btnAddBall.height / 2 );
            btnAddBall.label = "Add Ball";      

            addChild(btnAddBall);      

            btnAddBall.addEventListener(MouseEvent.CLICK, addBall);  

			var btnRemoveBall:Button = new Button();
            btnRemoveBall.width = 120;
            btnRemoveBall.height = 25;
            btnRemoveBall.move ( 75, stage.stageHeight - 20 - btnRemoveBall.height / 2 );
            btnRemoveBall.label = "Remove Last Ball";      

            addChild(btnRemoveBall);

            btnRemoveBall.addEventListener(MouseEvent.CLICK, removeLastBall);

			var btnClearBoard:Button = new Button();
            btnClearBoard.width = 120;
            btnClearBoard.height = 25;
            btnClearBoard.move ( 575, stage.stageHeight - 20 - btnClearBoard.height / 2 );
            btnClearBoard.label = "Clear Board";      

            addChild(btnClearBoard);

            btnClearBoard.addEventListener(MouseEvent.CLICK, clearBoard);
		}
	}
}

Thursday, August 7th, 2008 at 12:04 pm and is filed under APE - Actionscript Physics Engine, Actionscript 3. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.