class

CP::Shape::Circle

Inherits CP::Shape < Reference < Object

A circle shape defined by a radius

This is the fastest and simplest collision shape

Constructors

new(body : Body | Nil, radius : Number, offset : Vect = CP::Vect.new(0, 0))

The parameters are: the body to attach the circle to; the offset from the body's center of gravity in body local coordinates.

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Class methods

area(r1 : Number, r2 : Number) : Float64

Calculate area of a hollow circle.

r1 and r2 are the inner and outer diameters. A solid circle has an inner diameter of 0.

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moment(m : Number, r1 : Number, r2 : Number, offset : Vect = CP::Vect.new(0, 0)) : Float64

Calculate the moment of inertia for a circle.

r1 and r2 are the inner and outer diameters. A solid circle has an inner diameter of 0.

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Instance methods

offset

Get the offset of a circle shape.

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offset=(offset : Vect)

Unsafe. Set the offset of a circle shape.

This change is only picked up as a change to the position of the shape's surface, but not its velocity. Changing it will not result in realistic physical behavior. Only use if you know what you are doing!

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radius

Get the radius of a circle shape.

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radius=(radius : Number)

Unsafe. Set the radius of a circle shape.

This change is only picked up as a change to the position of the shape's surface, but not its velocity. Changing it will not result in realistic physical behavior. Only use if you know what you are doing!

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