Circle Collider's offset does not apply to its bounding box

Cocos Creator
#1

When i set for example a circle collider in a node, it creates a bounding box around automatically, but this bounding box is connected to the anchor point, is there a way to move this bounding box without modifying the anchor?

The example above shows a circle collider (white circle) and a bounding box (blue rect) with a (0.5, 0) anchor.

I want to keep the bounding box centralized relative to the white circle with an anchor of (0.5, 0), how do i do this? Like this:

Maybe it is a bug, right, @pandamicro, @nantas2, @zhangbin ? The blue rect should or must follow the white circle, but it is not happening.

1 Like
#2

I think it is a bug of circle collider because box and polygon colliders work no problem, their bounding boxes are centralized relatively to their offsets.

#3

Maybe it is not applying the offset to the bounding box (aabb) here at this part of the code (source)

updateCollider: function (collider) {
   ...
   else if (collider instanceof cc.CircleCollider) {
        var p = cc.pointApplyAffineTransform(collider.offset, t);

        var tmpX = t.tx, tmpY = t.ty;
        t.tx = t.ty = 0;

        var tempP = cc.pointApplyAffineTransform(cc.v2(collider.radius, 0), t);
        var d = cc.v2(tempP).mag();

        world.radius = d;
        world.position = cc.v2(p);

        t.tx = tmpX;
        t.ty = tmpY;

        aabb.x = tmpX - d;
        aabb.y = tmpY - d;
        aabb.width = d * 2;
        aabb.height = d * 2;
    }
    ...
}
#4

My question is: collider.offset is being applied to tmpX and tmpY? Could someone explain this code?

#5

Perhaps we can ask @nantas2 to help

1 Like
#6

So? Maybe the last developer who committed this source code might help. Do you know him?

#7

I do. I have pinged him to help.

2 Likes
#8

Thanks for your feedback.
This fixed in https://github.com/cocos-creator/engine/pull/1281.

2 Likes
#9

Thanks! So will it be released for the next beta of cocos creator 1.3.x?

#10

Yes, it will be released for 1.3.x.

2 Likes