RST-11: Shoot an Alien

Lesson

• read about "Collision Detection"

• go over how to check if one object is touching another

  • there is a "stage.collide" method

    • we need to check if one object is inside the box of another object, not that easy!

    • go over box collision and how you might want to change it slightly, especially for the lasers

• do collision detection of lasers and aliens

  • if an alien is hit, you should make it move off the screen

    • but then make 2 randomly re-appear!