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00704_Assignment_4_Pong_in_Shoes.mdown

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Assignment 4 Pong in Shoes

Create your own Pong in Shoes by doing the following 5 steps.

  1. Open Shoes Window / Play Pong in Shoes

    • Window's width and height are both 400 pixel.
    • Can't resize.
    • Show your app name and revision number on the window's title bar.
    • Color the surface of the window with the horizontal gradation.
    • Play Pong in Shoes written by _why.
    • Hack (read) the code.

  2. Show two paddles and a ball

    • Allocate computer paddle on the top (immobile yet).
    • Allocate player's (your) paddle on the bottom.
    • Your paddle synchronizes with the mouse movement.
    • A ball appears left-top side and moves smoothly to right-bottom side at 20 frames per second.

  3. Lock-in the ball within the window

    • Bounce a ball on the edge of the window.
    • Computer's paddle synchronizes with the ball movement.

  4. Hit the ball

    • Have your paddle hit the ball.
    • have computer's paddle hit the ball.
    • Change ball's speed and bounce angle when the ball is hit.

  5. Have a match

    • When the ball goes over the goal lines, game finishes with victory message.

sample58.png

sample58.png

# sample58.rb
Shoes.app :width => 400, :height => 400, :resizable => false do
  vx, vy = 3, 4
  
  nostroke
  @ball = oval 0, 0, 20, :fill => forestgreen
  @comp = rect 0, 0, 75, 4, :curve => 2
  @you = rect 0, 396, 75, 4, :curve => 2
 
  @anim = animate 40 do
    nx, ny = @ball.left + vx.to_i, @ball.top + vy.to_i
    
    if @ball.top + 20 < 0 or @ball.top > 400
      para strong("GAME OVER", :size => 32), "\n",
        @ball.top < 0 ? "You win!" : "Computer wins", :top => 140, :align => 'center'
      @ball.hide and @anim.stop
    end
     
    vx = -vx  if nx + 20 > 400 or nx < 0
    
    if ny + 20 > 400 and nx + 20 > @you.left and nx < @you.left + 75
      vy = -vy * 1.2
      vx = (nx - @you.left - (75 / 2)) * 0.25
    end
    
    if ny < 0 and nx + 20 > @comp.left and nx < @comp.left + 75
      vy = -vy * 1.2
      vx = (nx - @comp.left - (75 / 2)) * 0.25
    end
    
    @ball.move nx, ny
    @you.left = mouse[1] - (75 / 2)
    @comp.left += 10  if @comp.left + 75 < @ball.left
    @comp.left -= 10  if @ball.left + 20 < @comp.left
  end
end

Have fun!

Note

a pong challenge

Policeman

The sample58.rb worked well with Shoes-0.r1263