Review: Asteroid Blaster

Create your own asteroid destroying masterpiece.

Student Task #1: Create the Spaceship

Create a spaceship for the player to control

1. Create a sprite, with the image set to a spaceship. Store it in the variable ||variables:spaceship||
2. Add a ||controller:move spaceship with buttons|| block, and set both ||controller:vx|| and ||controller:vy|| to 50
3. ||sprites:Change|| ||variables:spaceship||s ||sprites:y|| position by 40, to move them closer to the bottom of the screen
4. Use ||info:set life to 3|| to start the player off with some life
5. Use ||info:set score to 0|| to start the player off with no score

Student Task #2: Firing Lasers

Add the ability for the player to fire lasers

1. Create an ||controller:on A button pressed|| event
2. In the event, create a ||sprites:projectile from spaceship|| with a ||sprites:vx|| of 0 and a ||sprites:vy|| of -100
3. Change the image of each ||sprites:projectile|| image to be a laser - a one or two pixel line is enough
4. Set the kind of each ||sprites:projectile|| kind to Laser
5. Set the ||sprites:z|| value for the ||sprites:projectile|| to be -1, so that it appears below the ship

Student Task #3: Evil Asteroids

Add asteroids for the player to avoid, that are created more quickly as time goes on

1. Create a ||loops:forever|| loop
2. Inside the ||loops:forever|| loop, create a ||sprites:projectile from side|| with an image of an asteroid and change both the ||sprites:vx|| and ||sprites:vy|| to ||math:random|| values between -50 and 50
3. Set it to be of ||sprites:kind| Asteroid
4. After creating the Asteroid, use ||loops:pause|| to pause for 2000 - (30 x ||info:score|| ) ms. As the player scores more points, the time between asteroids being created decreases

Student Task #4: Damage

Add an event so that the player loses life

1. Add an event for when a sprite of kind Player overlaps with a sprite of kind Asteroid
2. Decrease ||info:life|| by 1
3. ||sprites:destroy|| the Asteroid sprite

Student Task #5: Laser Effect

Give the laser some power to destroy the asteroids

1. Add an event for when a sprite of kind Laser overlaps with a sprite of kind Asteroid
2. Increase the player’s score by one
3. ||sprites:destroy|| both the Asteroid and Laser sprites involved in the overlap

Challenges

Currently, the game gets nearly impossible to progress past 67 or so points; at that point, the ||loops:pause|| will do nothing, as 2000 - 30 * 67 is less than 0. To fix this, use ||math:max|| in the ||loops:pause||, to choose the maximum (largest) value between the current equation, and 500.