Solutions for Teacher - Projectiles from Sprites

Go to Activity: Projectiles from Sprites.

Complete student tasks 1 and 2.

Tasks

Task 1

• Modified code to make a target sprite on the other side of the screen from the player sprite.
• Added a countdown timer.
• Created an on overlap event for the ball and the target to add a point and destroy the ball.

Shared Project: Throw Ball

Task 1 Challenge

• Made the target into projectiles that move down the screen and added vertical motion to the player sprite.

Shared Project: Throw Ball Challenge

Task 2

• Created a projectile that moves across the bottom of the screen that, while moving, gives off different projectiles that “float” to the top of the screen.

Shared Project: Projectile from bottom

Task 2 Challenge

• Made the projectile "float" up from the bottom of the game screen and give them a small random X direction so they move at a slight angle left or right.

Shared Project: Projectile from bottom random

Questions

Answer the following reflection questions regarding the projectiles from sprites activities:

1. How can we make a sprite move from another sprite? Explain the block code to use.
2. Give examples of using on overlap events in a game to make projectiles that are decorations, laser beams, and coins. Explain each.
3. Create a hypothesis about why it might be useful to make projectiles have ghost on.

Activity Solutions

Answer the following reflection questions regarding the projectiles from sprites activities:

1. How can we make a sprite move from another sprite? Explain the block code to use.

2. Give examples of using on overlap events in a game to make projectiles that are decorations, laser beams, and coins (reward). Explain each.

• Decorations - No overlap event, sprites should just pass through.
• Laser beams - Shooting from a ship into an obstacle should destroy the obstacle and the projectile and give you a point.

• Coins - you collect the coins and earn points.

3. Create a hypothesis about why it might be useful to make projectiles have ghost on:

• When a projectile has its property ghost set to On, that means Sprites can pass right through it. This is useful if you are using projectiles as decorations - when you don't need to use an On Sprite Overlap Event Handler block. If a projectile is a ghost, then the Overlap event won't be triggered.