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Ping Pong Game (Multiplayer game)

Scratch

Abhinav (WiSE program)

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In this Game……

We will make a multiplayer game (ping pong)

One player has the controls w and s to control the paddle

The other player has up arrow and down arrow to control the paddle

Concepts used – The concept of direction

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Background

  • We make a backdrop with two different colours on either side. We use these two different colours for the scoring of the game

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Sprites (Two Paddles)

  • We will make two paddle sprites and then give the code to move them

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Code for player 1 to move the paddle

  • We first set the ‘x’ to the right corner and then set y to anywhere on the screen.
  • Then we put a forever loop and inside the forever loop we say ‘if up arrow key pressed’ then move the paddle upwards by 10 steps
  • We then say ‘if down arrow key pressed’ then move the paddle downwards by 10 steps
  • This code helps us to give the direction of the paddle

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Code for Player 2 to move the paddle

  • We first set the ‘x’ to the left corner and then set y to anywhere on the screen.
  • Then we put a forever loop and inside the forever loop we say ‘if w key pressed’ then move the paddle upwards by 10 steps
  • We then say ‘if s key pressed’ then move the paddle downwards by 10 steps
  • This code helps us to give the direction of the paddle

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Giving the code to the Ball to start moving

  • We first set the ball to the centre of the screen. We then tell the ball to take a random direction by giving a pick random. After it has taken a direction we will ask it to start moving and if it is on the edge we will ask it to bounce back

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Initial Direction of the Ball

This is the initial direction of the Ball

180 degrees is facing downward

This is 250 (180 + 70). So the ball can start moving anywhere between this area

This is 110 (180 - 70). So the ball can start moving anywhere between this area

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Code for Ball to bounce off the paddle

  • We will say to the Ball sprite, If touching right of left paddle point in direction 180 + whatever direction it was. We add an extra 10 to it so that the direction doesn’t be constant (eg. 10, 190, 10, 190) and changes everytime for the ball

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Some examples

Lets say direction was 120. This means it goes in the direction of 120 and when it touches paddle it will reflect back on direction 310 = -50 (120 + 180 + 10). This will keep continuing so next direction will be 140 (180 + (-50) + 10) and so on……

Lets say direction was 210 (-150). This means it goes in the direction of -150 and when it touches the paddle it will reflect back on direction 40 (-150 + 180 – 10). This keeps on continuing and the next direction will be 230 (40 + 180 + 10) and so on......

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Giving score to Player 1

  • We first create a variable ‘Player 1 score’ We say that if it is touching the colour opposite to it or behind player 2’s sprite it will give points. We use a wait to prevent it from giving extra points

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Giving score to player 2

  • We first create a variable ‘Player 2 score’ We say that if it is touching the colour opposite to it or behind player 1’s sprite it will give points. We use a wait to prevent it from giving extra points

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Link for the Ping Pong Game

Click this to go to the Pong Game