Colliders¶

The library provides two different collider types convex and concaves. Both supported types requires knowledge that you use the correct type of collider. Colliders themselves don’t yet provide validation.

Usage¶

Changed in version 0.1.4.

The easiest way to create colliders is to import `create_collider` function and use that to create colliders:

```from pygame_colliders import create_collider

convex_poly_points = [(13, 10), (13, 3), (6, 3), (6, 10)]
convex_collider = create_collider(convex_poly_points)

concave_poly_points = [(3, 3), (5, 3), (5, 4), (4, 4), (4, 5), (5, 5), (5, 6), (3, 6)]
concave_collider = create_collider(collider_points)
```

Testing collisions is as simple as creating colliders. Once you do have colliders created like instructed on the above then just test if two colliders do collide against each other like the following:

```collider_a_points = [(13, 10), (13, 3), (6, 3), (6, 10)]
collider_a = create_collider(collider_points)

collider_b_points = [(3, 3), (5, 3), (5, 4), (4, 4), (4, 5), (5, 5), (5, 6), (3, 6)]
collider_b = create_collider(collider_points)

if collider_a.collide(collider_b):
print("Collision detected")
```

It is possible to create colliders with explicit collider creators but this requires known which type collider you do have since spesific creators don’t check against invalid colliders.

Convex colliders¶

Convex colliders are the simpler ones of the two supported. In convex collider all inner angles are less or equal to 180 degrees.

Creating a convex collider:

```collider_points = [(13, 10), (13, 3), (6, 3), (6, 10)]
collider = ConvexCollider(collider_points)
```

Math Open Reference provides interactive tool to try out convex polygons.

Concave colliders¶

In concave colliders one or more inner angles are greater than 180. All convex colliders are concave polygons as well.

Using the concave collider causes in the initial stage splitting the concave collider to a convex colliders.

Creating a concave collider:

```collider_points = [(3, 3), (5, 3), (5, 4), (4, 4), (4, 5), (5, 5), (5, 6), (3, 6)]
collider = ConcaveCollider(collider_points)
```

The code above creates C-shaped collider.