Shoes.app :width => 400, :height => 300 do
@x, @y = 0, 0
@shape = shape :fill => '#333', :stroke => '#aaa' do
move_to 0,0
line_to 300,-100
line_to 0,-100
line_to 0,0
end
animate 30 do
@shape.move(@x+=3,@y+=5)
end
endAs you can (may) see, as soon as the shape touches the bottom it disappears.
