bonk-docs/content/shapes/introduction.md

title	date	weight
Introduction	2019-09-14T19:19:03-07:00	5

In Bonk, a Shape2D is defined by two methods.

1. A support function, which is a method that returns the farthest possible position Vector2 in a given Vector2 direction defined by the shape with its vertices transformed by a Transform2D

2. A method for creating an axis-aligned bounding box from the shape.

Bonk provides you with 4 built-in common 2D shapes, but you can implement these methods to create custom Shape2D structs.

Note that these shapes should be defined with zero-centered Position2D structs. You will use a Transform2D to manipulate the shape's position, rotation, and scale in 2D space.

A final restriction to note: Defining concave shapes is an error. The collision solving algorithm that Bonk uses does not support concave shapes. If you wish to define concave shapes, define them as a composition of multiple convex shapes.