June 2015
Intermediate to advanced
388 pages
7h 31m
English
Content preview from Android Game Programming By ExampleBecome 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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Precise collision detection with the border
To upgrade our detect method, we need to replace the return statement in the if(possibleCollision) block with the more precise detection code.
First, initialize radianAngle to be the radian equivalent of whichever direction (in degrees) our object is facing. The Math class uses radians as they are more mathematically useful in calculations than the easier to visualize degree measurement.
The variables cosAngle and sinAngle are just what the name suggests, and are used in the block of code which follows this one.
Tip
It is worth mentioning that the Math.cos() and Math.sin() methods are relatively time consuming. We can speed up our collision detection class by precomputing 360 values for both sin and cos ...
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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.