Unit 6 Motion – Air Hockey

Evangel CollegeS.2 ICT

Air Hockey Game• Have you ever played Air Hockey in

game center? Do you want to create this game?

Names of components

Mallet

Puck

Goal Rail

Center line

PuckHow to make a movable puck?

Paint a new sprite and rename it Puck

Add the “move” block to the script area of Puck. Click on the “move” block.

What do you find?

PuckHow to make the Puck moving

continuously?

Add the “forever” block to wrap the “move” block

What do you find?

PuckHow to make the Puck bounce on the

edge of the air hockey table?

Add the “if on edge, bounce” block at the end of the stack.

What do you find?

PuckHow to change the direction of the

Puck so that it does not just move left and right?

Add the “point in direction” before “forever” block and adjust the direction value.

What do you find?

MalletHow to make a mallet?

Paint a new sprite and rename it Mallet

MalletHow to make the Mallet stick to the mouse?

Add the “go to ” block to the script area of Mallet

Change the position to “mouse-pointer”.Wrap it with “forever” block.

What do you find?

Collision detectionHow detect collision between two

sprites?

The “touching” block can detect collision of the sprite with other sprites. It can be used in condition blocks such as “if” block, “if-else” block or “wait until” block.

Programming Concept: Condition

Conditional statement:A program may

perform different actions depending on the boolean condition evaluated to be true or false. It is very commonly used in programming.

Key pressed?

Turn back

Face the mallet

Yes

No

Collision detectionWhat should happen when the puck

collides with the mallet?

x

Puck(Start)

Mallet

Puck(Bounce back)

GoalHow to make the goals of two players?

Paint two new sprites and rename them P1Goal and P2Goal respectively

GoalWhat should happen when the puck

collides with the goals of players?

Mix together

Extended ActivityActivity 1 (Initialization):Add script to reset the position of the

puck to the center (0, 0) of the stage at the beginning of the game.

Programming Concept: Initialization

Initialization:Initialization resets the program to a

certain state.

Challenging ActivitiesActivity 2 (Randomization):Add script to add a random turning

angle (ranges from -10 to +10 degrees) after bouncing from the mallet.