triangle_spec.rb

require 'ruby2d'

RSpec.describe Ruby2D::Triangle do
  describe '#new' do
    it "creates a triangle with white color by default" do
      triangle = Triangle.new
      expect(triangle.color).to   be_a(Ruby2D::Color)
      expect(triangle.color.r).to eq(1)
      expect(triangle.color.g).to eq(1)
      expect(triangle.color.b).to eq(1)
      expect(triangle.color.a).to eq(1)
    end

    it 'creates a new triangle with one color via string' do
      triangle = Triangle.new(color: "black")
      expect(triangle.color).to be_a(Ruby2D::Color)
    end

    it "creates a new triangle with one color via array of numbers" do
      triangle = Triangle.new(color: [0.1, 0.3, 0.5, 0.7])
      expect(triangle.color).to be_a(Ruby2D::Color)
    end

    it "creates a new triangle with 3 colors via array of 3 strings" do
      triangle = Triangle.new(color: ["red", "green", "blue"])
      expect(triangle.color).to be_a(Ruby2D::Color::Set)
    end

    it "creates a new triangle with 3 colors via array of 3 arrays of arrays of numbers" do
      triangle = Triangle.new(
        color: [
          [0.1, 0.3, 0.5, 0.7],
          [0.2, 0.4, 0.6, 0.8],
          [0.3, 0.5, 0.7, 0.9]
        ]
      )
      expect(triangle.color).to be_a(Ruby2D::Color::Set)
    end

    it "throws an error when array of 2 strings is passed" do
      expect do
        Triangle.new(color: ["red", "green"])
      end.to raise_error("Triangles require 3 colors, one for each vertex. 2 were given.")
    end

    it "throws an error when array of 4 strings is passed" do
      expect do
        Triangle.new(color: ["red", "green", "blue", "fuchsia"])
      end.to raise_error("Triangles require 3 colors, one for each vertex. 4 were given.")
    end
  end


  describe '#contains?' do
    it "returns true if point is inside triangle" do
      triangle = Triangle.new(
        x1:   0, y1:   0,
        x2:   0, y2: 100,
        x3: 100, y3:   0
      )
      expect(triangle.contains?(25, 25)).to be true
    end

    it "returns true if point is inside text" do
      triangle = Triangle.new(
        x1:   0, y1:   0,
        x2:   0, y2: 100,
        x3: 100, y3:   0
      )
      expect(triangle.contains?( 25, -25)).to be false
      expect(triangle.contains?(-25,  25)).to be false
      expect(triangle.contains?(100, 100)).to be false
    end
  end
end