Breakout — Milestone #2

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Your goal in Milestone #2 is to display the paddle at the bottom of the window and then get it to move along with the x-coordinate of the mouse. The important subtasks are:

  1. Add a GRect at the bottom of the window to serve as the paddle. The paddle should initially be centered horizontally on the canvas.
  2. Add a mouse listener that resets the location of the paddle whenever the mouse moves. This listener should ignore the y coordinate and make sure that the center of the paddle tracks the x coordinate.
  3. Add the code necessary to ensure that the paddle never moves past the boundaries of the canvas.
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