XNA Game-Themed CS1 Examples (XGC1)

Release 2.0 (XNA V3.1)

Topic: Topic.3.ModulesAndFunctions
Example: Ex_10.MathLibrary

Math Library Functions



1. Obtain the example code



As you can see, this program animates the movement of two soccer balls from left to right across the screen.  When the soccer balls go beyond the end of the screen, they "wrap around" and jump back to the left edge of the screen.  The top soccer ball traces out the path of a sine wave, while the bottom soccer ball traces out the path of a cosine wave.  (You may find it useful to search the web for terms like "sine wave", or "sine wave animation" if you'd like more information about these mathematical concepts)  There are only two ways to interact with the game (not counting the standard "Press the Back button to exit" way):

  1. By pushing the right thumbstick up or down, you can increase or decrease the amplitude of the waves, meaning that you can make the waves (vertically) bigger or smaller.

  2. By pushing the right thumbstick left or right, you can increase or decrease the period of the waves, meaning that you can make the waves (horizontally) longer or shorter.

2. Examining The Program:



  2. Trying out other mathematical functions
    Modify the provided solution so that your program demonstrates the use of several common mathematical functions, that are built into the core C# / .Net framework.  For each one, follow the pattern set forth in the tutorial's code, and set the Y value of the center of one of the circles equal to the output from each of the below functions, one at a time.  The goal for this exercise is to give you the opportunity to look up various math functions, and make use of them here, in a graphical manner.

Project home page: The Game-Themed Introductory Programming Project.
Kelvin Sung
Computing and Software Systems
University of Washington, Bothell
Michael Panitz
Business And Information Technology
Cascadia Community College
