0 votes

I'm trying to do some manipulation of mouse click coordinates which requires using the extents of a CollisionShape2D with shape RectangleShape2D. Here are the relevant details

Root node
Rect position (0,0)
Rect size x=860 y=733
Rect scale x=0.75 y=0.75

Transform position (430,365)
Transform Scale x=1 y=1
Absolute position (322.5,273.75)

Transform position (0,0)
Transform scale x=1 y=1
Shape extents x=327 y=327

I've manually resized the CollisionShape2D so that it covers precisely the subarea of the root TextureRect upon which I wish to capture clicks. This yields the given extent values.

My original interpretation of the way Extents work told me that the absolute x-coordinates of the edges of the CollisionShape2D should be

322.5 - 327 = -4.5
322.5 + 327 = 649

But now I know that isn't how it works since it is plain from the viewport's ruler that the true values are approximately 77.5 and 567.5.

So I think there is something I'm not understanding about how extents work but the only description I've been able to find online is that they are the shape's half width and half length.

If I change the scale on the root node to x=1 and y=1, say, I notice that the extent values remain fixed despite the RectangleShape2D being scaled up in size. So the lengths referred to by the extents must be with respect to some other (hidden) ruler than the one provided by the viewport, which makes it difficult for me to understand and work with the values.

Can anyone help me understand what that hidden ruler is, and how to work with the extent values?

in Engine by (67 points)

Please log in or register to answer this question.

Welcome to Godot Engine Q&A, where you can ask questions and receive answers from other members of the community.

Please make sure to read Frequently asked questions and How to use this Q&A? before posting your first questions.
Social login is currently unavailable. If you've previously logged in with a Facebook or GitHub account, use the I forgot my password link in the login box to set a password for your account. If you still can't access your account, send an email to [email protected] with your username.