Programming 2D Games

144 5. Sprites and Animation

Aer the velocities are determined, use them to change the x and y position

of the ship like this:

ship.setX(ship.getX() + frameTime * Xvelocity); // Apply X velocity

4. (Challenging.) Make the spaceship appear to orbit the planet as viewed from above.

at is, the ship should travel in a circle on the screen.

5. (Very challenging.) Make the spaceship appear to orbit the planet as it ies in front

of and then behind the planet. Start the ship 1/4 of the way across the screen and

centered vertically. Make the ship get bigger in size as it travels from le to right

until it is in the center of the screen, then start ...