Optmised collision

faster_collide.rb

class Rect
  def collide_new?(rect)
    rect = rect.to_rect

    rect.x < x + width and
      x < rect.x + rect.width and
      rect.y < y + height and
      y < rect.y + rect.height
  end
end

a, b = Rect.new(0, 0, 1, 1), Rect.new(2, 2, 1, 1)

Benchmark.bm do |x|
  x.report("a.collide? b   ") { 10000.times { a.collide? b } }
  x.report("my a.collide? b") { 10000.times { a.collide_new? b }}
  x.report("a.collide? a   ") { 10000.times { a.collide? a }}
  x.report("my a.collide? a") { 10000.times { a.collide_new? a }}
end

#                    user     system      total        real
# a.collide? b     0.172000   0.000000   0.172000 (  0.172000)
# my a.collide? b  0.016000   0.000000   0.016000 (  0.013000)
# a.collide? a     0.093000   0.000000   0.093000 (  0.089000)
# my a.collide? a  0.047000   0.000000   0.047000 (  0.046000)

# Compared with the collide? in the gem (which fails in certain cases).