Handling Collisions?

Question

Currently, I have a very very poor colision system. It's based off 4 points, if they hit an object, it stops me, if they don't, I can move freely. Simple right?

The issue is that these points don't cover my entire player object. I tried using a line, and it tweaked out and made it impossible to walk left (I'm working on my left collider before the rest). I also tried making a for loop that would handle all possible points between 2 given numbers (in this case 0 through -116.5). I don't think I initialized it correctly upon testing so it didn't work.

This is the check if I hit or not. True = hit, false = not hit.

var leftBumping:Boolean = false;

Here are my last 2 efforts:

var leftLine:Shape = new Shape();

leftLine.graphics.lineStyle(1,0x000000,0);

leftLine.graphics.moveTo(-26, 0);

leftLine.graphics.lineTo(-26, -115);

/**var leftBumpPoint:Array = new Array(leftP1, leftP2, leftP3, leftP4, leftP5, leftP6);

var leftP1:Point = new Point(-30, -55);

var leftP2:Point = new Point(-30, 0);

var leftP3:Point = new Point(-30, -25);

var leftP4:Point = new Point(-30, -75);

var leftP5:Point = new Point(-30, -195);

var leftP6:Point = new Point(-30, -116.5);**/

I have leftLine being used right now and it currently doesn't want to work correctly.

And the if/else statement to check:

	if(back.collisions.hitTestPoint(player.x + leftLine.x+1, player.y + leftLine.y+1, true)){
		leftBumping = true;
	} else {
		leftBumping = false;
	}

(I have no idea why it's putting that code into a table)

What's a good way to handle this?

kglad · Answer

if you want to use shape-based collision detection, use the bitmapdata class'es hittest.

in its most basic form, you create a bitmapdata object for each of the two objects you want to test and then use the hittest on those bitmapdata objects:

var bmpd1:BitmapData=bitmapdataF(mc1);

var bmpd2:BitmapData=bitmapdataF(mc2);

.

if(bmpd1.hitTest(bmpd2)){

//do whatever

}

.

function bitmapdataF(dobj:DisplayObject):BitmapData{

var bmpd:BitmapData=new BitmapData(dobj.width,dobj.height);

bmpd.draw(dobj);

return bmpd;

}

you'll need to do more than this basic example, because your bitmapdata objects will need to account for transforms of your displayobjects.

	var p:Point = new Point(-30, i);
	leftBumpPoint.push(p);

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