November 2011
Intermediate to advanced
348 pages
7h 2m
English
Content preview from HTML5 Canvas CookbookBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 4. Mastering Transformations
In this chapter, we will cover:
- Translating the canvas context
- Rotating the canvas context
- Scaling the canvas context
- Creating a mirror transform
- Creating custom transforms
- Shearing the canvas context
- Handling multiple transforms with the state stack
- Transforming a circle into an oval
- Rotating an image
- Drawing a simple logo and randomizing its position, rotation, and scale
Introduction
This chapter will reveal the power of canvas transformations, which can drastically simplify complex drawings and provide new functionality that we wouldn't have had otherwise. Until now, we've been positioning elements on the screen directly with x and y coordinates. This can quickly become a problem if you've worked out the coordinates ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.