# File lib/rubygame/ftor.rb, line 344 def rotate!(angle) # case(angle) # when HALF_PI, -THREE_HALF_PI # self.set!(@y,-@x) # when THREE_HALF_PI, -HALF_PI # self.set!(-@y,@x) # when PI, -PI # self.set!(@y,-@x) # when 0, TWO_PI, -TWO_PI # self.set!(@y,-@x) # else self.a += angle # end return self end