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OpenGL Game Development By Example

You're reading from   OpenGL Game Development By Example Design and code your own 2D and 3D games efficiently using OpenGL and C++

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Product type Paperback
Published in Mar 2016
Publisher
ISBN-13 9781783288199
Length 340 pages
Edition 1st Edition
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Authors (2):
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Robert Madsen Robert Madsen
Author Profile Icon Robert Madsen
Robert Madsen
Stephen Madsen Stephen Madsen
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Stephen Madsen
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Table of Contents (14) Chapters Close

Plotting your revenge

Okay, so you're not really plotting your revenge. But you are plotting everything in your game as if you were putting it all down on a piece of graph paper. Remember high-school geometry? You got out your graph paper, drew a couple of lines for the X and Y axis, and the plotted points on the graph. OpenGL works in pretty much the same way.

The OpenGL coordinate system

The OpenGL coordinate system is a standard X and Y axis system that you have most likely learned all your life. You can conceptualize (0, 0) as being the center of the screen.

Let's say that we want to display a moving car on the screen. We could start by plotting our car at position (5, 5) in the coordinate plane. If we then moved the car from (5, 5) to (6, 5), then (7, 5), and so forth, the car would move to the right (and eventually leave the screen), as illustrated in the following figure:

The OpenGL coordinate system

We haven't been completely honest with you. Since OpenGL is a 3D rendering engine, there is actually...

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