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Processing 2: Creative Programming Cookbook

You're reading from   Processing 2: Creative Programming Cookbook

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Product type Paperback
Published in Sep 2012
Publisher Packt
ISBN-13 9781849517942
Length 306 pages
Edition 1st Edition
Languages
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Toc

Table of Contents (18) Chapters Close

Processing 2: Creative Programming Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
1. Getting Started with Processing 2 FREE CHAPTER 2. Drawing Text, Curves, and Shapes in 2D 3. Drawing in 3D–Lights, Camera, and Action! 4. Working with Data 5. Exporting from Processing 6. Working with Video 7. Audio Visualization 8. Exploring Computer Vision 9. Exploring JavaScript Mode 10. Exploring Android Mode 11. Using Processing with Other Editors Index

Making polygon soup


In the Drawing 3D primitives recipe, you've learned that Processing comes with two 3D primitives: the box and the sphere. Although these two shapes can be used to do great things, you might have more fun creating your own 3D shapes. We'll take a look at how you can create a flexible function to draw a cylinder in this recipe.

How to do it...

Just like in the previous recipes, you should start by importing the OpenGL library and setting up a window with a size of 640 x 480 pixels. The next thing we'll do is to write a function that will draw a cylinder to the screen. The code for the top and bottom of the cylinder should look familiar; we've used something similar in the Drawing custom shapes recipe, in the previous chapter. The code for the side of the cylinder is a little different.

void cylinder( int numSegments, float h, float r )
{
  float angle = 360.0 / (float)numSegments;
    
  // top
  beginShape();
  for ( int i = 0; i < numSegments; i++ ) {
    float x = cos...
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