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Lots of balls

In this lab, you will use cloning to create many identical sprites without having to rescript each one individually.

Part 1 - Follow the bouncing sprites

  1. Create a script that contains a single sprite, choose from available costumes (i.e. basketballs, hearts, stars, balloons, Alonzo, doves). When the green flag is clicked, the sprite should go to the center of the stage, pick a random direction, and start moving in the chosen direction. If the sprite hits a wall, it should bounce off and keep moving.

  2. Modify the script to be controlled by the stage rather than by the sprite itself. When the spacebar is pressed, the stage should broadcast a message that triggers the sprite's movement. Pressing the spacebar again should restart the sprite's movement, including a new speed and new direction.

  3. What would you need to do to add a second bouncing sprite (that behaved in the same way) to the script? What about 10 sprites? 100 sprites? What would happen if you wanted to change the speed of all the bouncing sprites in the script after you had created 100?

Part 2 - Clones

  1. Modify your script so that, instead of a single sprite restarting each time the spacebar is pressed, a new clone of that sprite is created. You'll want to use the Create a Clone of and When I starts as a clone blocks in place of Broadcast block and When I Receive block.

    Create a Clone of

    When I starts as a clone

    Broadcast block

    When I Receive block.

  2. What happens to the original ("master") sprite each time the spacebar is pressed? Does that seem useful? What role should the original sprite play now that we're cloning?

  3. Modify the script so that the original ("master") sprite hides at the beginning of the script and each new sprite appears when it is created.

  4. Save your project as Lab5.2.

Bonus: Assign each clone a different value for some properties, such as speed, color, or size. Try controlling these values from the master sprite rather than having each clone choose its own.

Grading rubric

Criteria Points
1.1 One bouncing sprite 0.5 points
1.2 Sprite controlled by stage 0.5 points
2.1 Clones created by stage 0.5 points
2.3 Hide master sprite 0.5 points
Bonus: Sprites have different properties 0.5 points
PROJECT TOTAL 2.0 points