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Beginning Pre-Calculus for Game Developers by Boris Meltreger, John P. Flynt

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Plotting Cosine Values

As Figure 12.17 illustrates, when you plot cosine values using a Cartesian plane, plot angle values on the x axis, and move to the right to show increasing values of angles, the resulting y coordinate value is 1 when the angle of your circle is 0. When you reach (90°), the value of the y coordinate value drops to 0. From there, as you move past , the value of the cosine decreases, reaching −1 when you are at π. As you move past π, the value of the cosine begins to increase, reaching 0 again at . After that, the value begins ...

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