(Actionscript 3) Pixel-perfect collision detection between the walls and player? - actionscript-3

Question

I am trying to make a flash game in which there is collision detection between the player and the walls. However, when I try using Wall11.hitTestPoint(), I cannot get the collision detection to be perfect. Then, I decided to use bitmap but it is hard to code this because the wall is irregularly shaped (it is not a square, rectangle, circle or any regular shape). Is there anyway to improve the collision detection with walls?
function checkCollision(_debug:Boolean = false):Boolean {
var bmd1:BitmapData = new BitmapData(Wall11.width, Wall11.height, true, 0);
var bmd2:BitmapData = new BitmapData(LevelOnePlayer.width, LevelOnePlayer.height, true, 0);
bmd1.draw(Wall11);
bmd2.draw(LevelOnePlayer);
if (_debug) {
var bmp:Bitmap = new Bitmap(bmd1);
bmp.x = Wall11.x;
bmp.y = Wall11.y;
addChild(bmp);
var bmp2:Bitmap = new Bitmap(bmd2);
bmp2.x = LevelOnePlayer.x;
bmp2.y = LevelOnePlayer.y;
addChild(bmp2);
}
if(bmd1.hitTest(new Point(Wall11.x, Wall11.y), 255, bmd2, new Point(LevelOnePlayer.x, LevelOnePlayer.y), 255))
return true;
if (!_debug) {
bmd1.dispose();
bmd2.dispose();
}
return false;
}

Answer 1

These are basics of hitTestPoint stuff.
package
{
import flash.geom.Point;
import flash.events.Event;
import flash.display.Shape;
import flash.display.Sprite;
import flash.display.StageAlign;
import flash.display.StageScaleMode;
import flash.text.TextField;
import flash.text.TextFormat;
import flash.text.TextFormatAlign;
public class HitTest extends Sprite
{
private var textArea:TextField;
private var Circle:Shape;
private var Box:Shape;
public function HitTest()
{
if (stage) onStage();
else addEventListener(Event.ADDED_TO_STAGE, onStage);
}
private function onStage(e:Event = null):void
{
removeEventListener(Event.ADDED_TO_STAGE, onStage);
stage.scaleMode = StageScaleMode.NO_SCALE;
stage.showDefaultContextMenu = false;
stage.align = StageAlign.TOP_LEFT;
stage.stageFocusRect = false;
addShapes();
addLabel();
onFrame();
// Call it every frame to keep things updated.
addEventListener(Event.ENTER_FRAME, onFrame);
}
private function onFrame(e:Event = null):void
{
// Place graphics to the center of the stage.
x = stage.stageWidth >> 1;
y = stage.stageHeight >> 1;
// Lets detect collision with the circle.
var aPoint:Point = new Point();
// Take local mouse coordinates within the target shape.
aPoint.x = Circle.mouseX;
aPoint.y = Circle.mouseY;
// Convert them into the root coordinates - it is the ONLY correct way.
// Comment the next 2 lines to see how local coordinates fail to work.
aPoint = Circle.localToGlobal(aPoint);
aPoint = root.globalToLocal(aPoint);
// Hit test the point against shape.
// Set the last parameter to false to see hitTest against the shape bounding box.
var aHit:Boolean = Circle.hitTestPoint(aPoint.x, aPoint.y, true);
textArea.text = aHit? "! HIT !": "NO HIT";
}
private function addShapes():void
{
Circle = new Shape();
Circle.graphics.lineStyle(2, 0x000000, 1);
Circle.graphics.beginFill(0xCC99FF, 1);
Circle.graphics.drawCircle(0, 0, 50);
Circle.graphics.endFill();
Box = new Shape();
Box.graphics.lineStyle(0, 0xCCCCCC, 1);
Box.graphics.drawRect(-50, -50, 100, 100);
addChild(Box);
addChild(Circle);
}
private function addLabel():void
{
textArea = new TextField();
textArea.x = 10;
textArea.y = 10;
textArea.width = 70;
textArea.height = 20;
textArea.border = true;
textArea.wordWrap = false;
textArea.multiline = true;
textArea.selectable = true;
textArea.background = true;
textArea.mouseEnabled = false;
var aFormat:TextFormat;
aFormat = textArea.getTextFormat();
aFormat.font = "_typewriter";
aFormat.size = 12;
aFormat.bold = true;
aFormat.align = TextFormatAlign.CENTER;
textArea.setTextFormat(aFormat);
textArea.defaultTextFormat = aFormat;
stage.addChild(textArea);
textArea.text = "NO HIT";
}
}
}