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Published in:
2017 | OriginalPaper | Chapter
1. Elementary Concepts
Authors : Leen Ammeraal, Kang Zhang
Published in: Computer Graphics for Java Programmers
Publisher: Springer International Publishing
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Abstract
This book is primarily about computer graphics programming and related mathematics. Rather than discussing general graphics subjects for end users or how to use graphics software, we will cover more fundamental subjects, required for graphics programming. In this chapter, we will first understand and appreciate the nature of discreteness of displayed graphics on computer screens. We will then see that x- and y-coordinates need not necessarily be pixel numbers, also known as device coordinates. In many applications, logical coordinates are more convenient, provided we can convert them to device coordinates before displaying on the screen. With input from a mouse, we would also need the inverse conversion, i.e. converting device coordinates to logical coordinates, as we will see at the end of this chapter.