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    Hour 18. Building a Simple Game > Detecting Collisions

    Detecting Collisions

    If you try different combinations of magnitude and direction, you should notice that once the ball leaves the screen, it is gone for good. To prevent this from happening, you need to add collision detection to the game logic. Numerous advanced collision detection algorithms are available, but for this game, you use a simple method for determining collisions, which initially detects a collision with the walls or sides of the screen.

    Try It Yourself: Detecting Border Collisions

    To detect a collision between the ball and the sides of the screen, you need to compare the current location of the ball and the coordinates of the screen sides. To keep the gameplay more realistic, you want to detect a collision with the outer diameter of the ball. By completing the following steps, you will implement the code necessary to detect and respond to a collision with the screen edges. If you closed Visual Studio, repeat the previous exercise first. Also, be sure to keep Visual Studio open at the end of this exercise because you will use this application later.


      

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