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Circular If you’re a trigonometry ace, you already know how amazing the sine and cosine functions are. If you’re not, we hope the next examples will trigger your interest. We won’t discuss the math in detail here, but we’ll show a few applications to generate fluid motion. Figure 8-2 shows a visualization of sine wave values and how they relate to angles. At the top and bottom of the wave, notice how the rate of change (the change on the vertical axis) slows down, stops, then switches direction. It’s this quality of the curve that generates interesting motion. The sin() and cos() functions in Processing return values between –1 and 1 for the sine or cosine of the specified angle. Like arc(), the angles must be given in radian values (see Example 3-7 on page 18 and Example 3-8 on page 19 for a reminder of how radians work). To be useful for drawing, the float values returned by sin() and cos() are usually multiplied by a larger value. Motion 113
Figure 8-2. A sine wave is created by tracing the sine values of an angle that moves around a circle 114 Getting Started with Processing <strong>www</strong>.<strong>ebook777.com</strong>
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Maker Media, Inc. 1160 Battery Stre
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Through founding the Aesthetics and
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Style Processing is flexible about
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drawing, 9 circular motion, 113-116
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lowercase/uppercase letters in code
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