Make `contains?` inclusive (#137)

If point is over the visual area, it's true. Also add default rectangle implementation to `renderable.rb`.

1 files changed, 6 insertions, 5 deletions

diff --git a/test/line_spec.rb b/test/line_spec.rb
index ac6d005..2129073 100644
--- a/test/line_spec.rb
+++ b/test/line_spec.rb
@@ -3,15 +3,16 @@ require 'ruby2d'
 RSpec.describe Ruby2D::Line do
 
   describe "#contains?" do
+    line = Line.new(x1: 0, y1: 0, x2: 100, y2: 100)
+
     it "returns true if point is inside the line" do
-      line = Line.new(x1: 0, y1: 0, x2: 100, y2: 100)
-      expect(line.contains?(25, 25)).to be true
+      expect(line.contains?(  0,   1)).to be true
+      expect(line.contains?(100, 100)).to be true
     end
 
     it "returns false if point is outside the line" do
-      line = Line.new(x1: 0, y1: 0, x2: 100, y2: 100)
-      expect(line.contains?(0, 10)).to be false
-      expect(line.contains?(10, 0)).to be false
+      expect(line.contains?(  0, 2)).to be false
+      expect(line.contains?(101, 0)).to be false
     end
   end