November 2011
Intermediate to advanced
384 pages
13h 23m
English
Content preview from HTML5: Your visual blueprint™ for designing rich web pages and applicationsBecome 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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ROTATE THE X- AND Y-AXES
You can rotate the entire canvas two-dimensional drawing plane, which makes drawing objects at a specific angle much easier as the number line the x- and y-axes follow is actually altered. For example, rotating a 100 × 100 canvas by 45° will move point (0, 100) from the far right, to the near bottom-right corner; point (50, 50) moves from the exact center to the middle of the left-side border.
Regardless of whether you need to rotate a shape 180°, 45°, or 1°, do not spend your time calculating the shape’s absolute coordinates rotated at an angle; just rotate the axes themselves.
All rotations occur around the origin point. Therefore, unless you first use translate(), your rotation will pivot around the top left of the ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.