Defines a new primitive. This will generate several helper methods so you can properly initialize your primitives.

Example

Here we create a sample Point class that has an x and y primitive. Now, after setting some contraints we can load the constraints into Kiwi::Solver and find the final values.

require "layout/primitive_tools"
require "kiwi"
class Point
  include PrimitiveTools
  primitive :x
  primitive :y
end

a = Point.new
b = Point.new
b.x.eq a.x + 10
b.y.eq a.y / 2
a.x.eq 10
a.y.eq 10
# go on to solve the block

For a full example take a look at the implementation of Block.