Pong Game

Open the starting file in your Z: folder with all the sprites. If you expand the Sprites folder, it should look like this...

Create a new wall object - just set the sprite and make it solid.

Create new object bat_left, select the sprite.

Add a new event: W-Key (under Keyboard>Letters>..."W")

Add the following action:

• Jump to Position: (0,-7), relative
  (negative y coordinate means going upwards)

Now duplicate the previous event and set it to the S-Key...

• Jump to Position: (0,7), relative 
  (positive y coordinate means going down)

Duplicate to create bat_right object.

Change the sprite name and sprite ...

Change events so the player on the right will use the up and down arrow keys.

• Change event "W-key" to <Up> arrow key

• Change event "S-key" to <Down> arrow key

Test this in a level. Create a room, leave grid default size 16x16. 

• Insert the bat_left object on the left side of the room (2nd column in) and the bat_right object on the right side of the room. 
• Line the top and bottom of the room with the wall object.

Test it out; make sure the bats move up and down with the right keys.

So far the bats can move, but there's a problem. They can also move out of the room! So we have to fix this with the following. 

Go back into the bat_left object...

• add a Collision with wall event.
• • Set it to Bounce (against all objects)

Go back into the bat_right object...

• add a Collision with wall event.
• • Set it to Bounce (against all objects)

Test it out - make sure it works before moving on to the next stage.

Create 2 new objects. Set them to the right sprite. Make them invisible so the player doesn't see it (uncheck the "Visible" box).

Create a new object ball. Set the sprite. 

First, we'll get it to move on its own and bounce off the walls and bats... 

• Create
• • Move Fixed: set it to the 4 corner directions, speed 8

• Collision with wall:
• • Bounce (against all objects)

• Collision with bat_left:
• • Bounce (precisely, against all objects)

• Collision with bat_right (can just duplicate previous event)
• • Bounce (precisely, against all objects)

Now we'll make sure that if it leaves the room, instead of disappearing, the ball will go back to its starting position...

• Collision with score_left:
• • Jump to Start
  • Sleep - makes the game pause a bit before it restarts (leave at default)
  • Set Score - give the player 1 pt, relative

You can duplicate the previous event for the Collision with score_right event...

Then just delete the Set Score action and replace it with Set Lives - set it to "1", relative (we'll use this to keep track of the right player's points)

• Place only one instance of the ball object in the middle of the room.
• Line the right side with the score_left object (=what will gives the left player points)
• Line the left side with the score_right object (=what will gives the right player points)

Test it out.

Make sure the score is zero every time the game starts, so in the ball object's Create event, add the following actions:

• Set Score to 0, not relative
• Set Lives to 0, not relative

Create a new object scores; no sprite.

• Draw
• • Draw Score: (40,40), for the caption type in "Player left: "
    make sure you include a space after the colon.
  • Draw Lives: (450,40), make the caption say "Player right: "
    make sure you include a space after the colon.

Place the scores object anywhere in your room (it'll be marked with a question mark). 

Test it out. You're done. Play it for a bit so I can see the score shows up and is working...