Fang Decision Exercise - Move a ball back and forth in a line.

Make your blue ball a moving target that can only move in a certain path. It should move in a single row, so its Y setting will never change. Do not make it move to a random location for a collision.

Steps:

Add 2 new class variables:

• Need to keep track of Blue's x location, so add a blueX variable.
• Need to keep track of whether Blue is moving right or left, so add a blueDirection integer variable.
• (note: Whenever you set the location of Blue, also set the blueX variable.)

Change MakeSprites:

• In the initial start of blueDot, be sure to set the blueX variable value.
• Set the initial blueDirection variable to 1.

Make a new method to moveBlue.

• If blueX >= .9, then the ball is on the right edge, and its blueDirection should change to -1.
• If blueX<=.1, the ball is on the left edge, and its blueDirection should change to 1.
• Always Move .1 * the blueDirection. (so Right is + .1 and Left is -.1)

Change AdvanceFrame:

• Add moveBlue to the advance method so blue moves every time the game advances.

An Extra: There are methods for OvalSprite that will set a facing direction and let you move forward.

• public void setOrientationDegrees(double degrees)
• public void forward(double distance)

An Extra: When it is intersected, move to a random x location, but its Y will stay the same.