A capsule is really just a rectangle with a 1/2 circle on either end. So, as far as calculating the area, it'd simply be:

- The area of the rectangle (width x height)
- The area of a full circle with a diameter matching the width of the rectangle

In Godot's definition of a `CapsuleShape2D`

you define both a `radius`

and a `height`

value. The `radius`

is the radius of the 1/2 circle on each end. The `height`

is the height of the rectangle between the 2, 1/2 circles. So, a `CapsuleShape2D`

with a height of 0 is essentially just a circle (with a zero height rectangle between the 2 halves).

So, for a real example, let's say we have a `CapsuleShape2D`

defined as follows:

`Radius: 10`

`Height: 20`

So, we have the following primitive shapes

- 1 complete circle with a radius of 10
- 1 rectangle with a width of 20 (radius * 2) and height of 20

From that, just calculate the areas of the 2 shapes.

- For the circle, that'd be
`PI * radius squared`

, so `314.6`

- For the rectangle, that'd be width x height, so
`400`

Add those together to get the area of the capsule -> `714.6`