Contents

describe Joybox::Physics::Shape do
  before do
    @world = World.new gravity: [0, -9.8]
    @body = @world.new_body position: [100, 100], type: Body::Dynamic do
      circle_fixture  radius: 60,
                      density: 1.0,
                      friction: 1.0,
                      restitution: 1.0
    end
    @shape = @body.fixtures[0].shape
  end

  it "should have radius" do
    @shape.radius.should == 60
  end

  it "should know if contains a point" do
    @shape.contains_point?([0, 0]).should == true
    @shape.contains_point?([30, 30]).should == true
    @shape.contains_point?([61, 61]).should == false
  end

  it "should ray cast the shape" do
    ray_cast_notified = false

    @shape.ray_cast first_point:[60, 60], 
                    second_point:[1, 1], 
                    maximum_fraction: 20, 
                    child_index: 0 do |hits, normal, fraction|
                      ray_cast_notified = true
                      hits.should == true
                      normal.should.be.close CGPointMake(22.62, 22.62), 0.01
                    end

    ray_cast_notified.should == true
  end

  it "should compute its aabb" do
    aabb = @shape.compute_aabb child_index: 0
    aabb.lower_bound.should == CGPointMake(-60, -60)
    aabb.upper_bound.should == CGPointMake(60, 60)
  end

  it "should compute its mass" do
    mass_data = @shape.compute_mass density: 1
    mass_data.mass.should.be.close 11.044, 0.01
    mass_data.center.should == CGPointMake(0, 0)
    mass_data.rotational_inertia.should.be.close 19.414, 0.01
  end
end

Version data entries

2 entries across 2 versions & 1 rubygems

Version	Path
joybox-1.1.1	spec/motion/joybox/physics/shape_spec.rb
joybox-1.1.0	spec/motion/joybox/physics/shape_spec.rb