[AS2] hitTest Displaced

[Archon68]

I'm making an overhead game with a scrolling map.

Here's my code, on the "player" instance. Obstacles are named "wall1", "wall2", etc. The game and player are in a movieclip, covered by an interface, which is the line you see across the middle of the screenshot below. The entire thing is in a movieclip on the _root layer.

onClipEvent (load) {
	var speed = 5;
}
onClipEvent (enterFrame) {
	if (Key.isDown(Key.LEFT)) {
		_parent._x += speed;
		this._x -= speed;
	}
	if (Key.isDown(Key.RIGHT)) {
		_parent._x -= speed;
		this._x += speed;
	}
	if (Key.isDown(Key.UP)) {
		_parent._y += speed;
		this._y -= speed;
	}
	if (Key.isDown(Key.DOWN)) {
		_parent._y -= speed;
		this._y += speed;
	}
	for (i in this._parent) {
		if (_parent[i]._name.indexOf("wall") != -1) {
			while (_parent[i].hitTest(this._x, this._y+this._height/2, true)) {
				_parent._y+=speed;
				this._y-=speed;
			}
			while (_parent[i].hitTest(this._x, this._y-this._height/2, true)) {
				_parent._y-=speed;
				this._y+=speed;
			}
			while (_parent[i].hitTest(this._x+this._width/2, this._y, true)) {
				_parent._x+=speed;
				this._x-=speed;
			}
			while (_parent[i].hitTest(this._x-this._width/2, this._y, true)) {
				_parent._x-=speed;
				this._x+=speed;
			}
		}
	}
}

The problem is, the ball is being stopped in an odd location (see below). As I walk around, there are "ghosts" of my barriers and walls, displaced a few hundred pixels from the real movieClips.

Screenshot:

[Archon68]

.FLA: http://spamtheweb.com/ul/upload/290609/6 7235_Overhead_Help.fla

[Woadraiders]

I spent probably, 5-10 minutes trying to figure this out. I've got no idea, I havn't done collision detection in over a year and I really dislike it.

If you and no one else can figure it out, then I would try putting everything on the top level and try hittesting again, and then just rewrite the scrolling code.

[Archon68]

At 6/29/09 08:23 PM, Woadraiders wrote: If you and no one else can figure it out, then I would try putting everything on the top level and try hittesting again, and then just rewrite the scrolling code.

I actually did that about an hour ago, but still nothing...

[polym]

That's because of the this.-y + this.height/2 code you have...

it's displaced by half of the height of the circle

[Woadraiders]

No, that's not right, its displaced far more than that.

[Andy-Parker]

At 6/29/09 10:55 PM, Woadraiders wrote: No, that's not right, its displaced far more than that.

while (_parent[i].hitTest(this._x+this._width/
2, this._y, true)) {

im not entirely sure what this is referring to. but if its not on the top layer that will be the problem. hitTest takes coordinates relative to the stage, regardless of what is being tested. however this._x and ._y will be relative to whatever this's parent is, and any parents above that. assuming none of the parents have been rotated, inverted, or stretched, you can fix it by going.

while (_parent[i].hitTest(this._x+this._parent ._x+this._width/2, this._y+this._parent._y, true)) {

[Archon68]

At 6/29/09 11:09 PM, Andy-Parker wrote:

At 6/29/09 10:55 PM, Woadraiders wrote: No, that's not right, its displaced far more than that.

while (_parent[i].hitTest(this._x+this._width/
2, this._y, true)) {

im not entirely sure what this is referring to. but if its not on the top layer that will be the problem. hitTest takes coordinates relative to the stage, regardless of what is being tested. however this._x and ._y will be relative to whatever this's parent is, and any parents above that. assuming none of the parents have been rotated, inverted, or stretched, you can fix it by going.

while (_parent[i].hitTest(this._x+this._parent ._x+this._width/2, this._y+this._parent._y, true)) {

That's really odd how hitTesting works. The code you gave me doesn't work, however. (And yes, to those people who lurk around help topics looking to flame, I did manipulate it into each of my while() actions). Is it because I have the game nested inside of two movieclips? Should I add another set of "displacers"?

[Archon68]

Bump.

[Andy-Parker]

At 6/30/09 08:30 AM, Archon68 wrote: That's really odd how hitTesting works. The code you gave me doesn't work, however. (And yes, to those people who lurk around help topics looking to flame, I did manipulate it into each of my while() actions). Is it because I have the game nested inside of two movieclips? Should I add another set of "displacers"?

might be worth a try. all i can tell you for sure is that hitTest takes coordinates relative to stage.

[Archon68]

At 7/1/09 11:17 AM, Andy-Parker wrote:

At 6/30/09 08:30 AM, Archon68 wrote: That's really odd how hitTesting works. The code you gave me doesn't work, however. (And yes, to those people who lurk around help topics looking to flame, I did manipulate it into each of my while() actions). Is it because I have the game nested inside of two movieclips? Should I add another set of "displacers"?

might be worth a try. all i can tell you for sure is that hitTest takes coordinates relative to stage.

But wait, both movieclips I want to check for hitTests with are in the same movieclip. They should have the same relative position, shouldn't they?