Cardboard VR Projects for Android by Jonathan Linowes & Matt Schoen

Author:Jonathan Linowes & Matt Schoen [Linowes, Jonathan]
Language: eng
Format: azw3
Publisher: Packt Publishing
Published: 2016-05-17T04:00:00+00:00

Time for animation

It's time to throw in a little more excitement. Let's animate the cube so that it rotates. This'll help demonstrate the shading as well.

For this, we need a Time class. This is a singleton utility class that ticks off frames and makes that information available to the application, for example, via getDeltaTime. Note that this is a final class, which explicitly means that it cannot be extended. There is no such thing as a static class in Java, but if we make the constructor private, we can ensure that nothing will ever instantiate it.

Create a new Time class in the renderbox/ folder. It won't be getting extended, so we can declare it final. Here's the code:

public final class Time { private Time(){} static long startTime; static long lastFrame; static long deltaTime; static int frameCount; protected static void start(){ frameCount = 0; startTime = System.currentTimeMillis(); lastFrame = startTime; } protected static void update(){ long current =System.currentTimeMillis(); frameCount++; deltaTime = current - lastFrame; lastFrame = current; } public static int getFrameCount(){return frameCount;} public static float getTime(){ return (float)(System.currentTimeMillis() - startTime) / 1000; } public static float getDeltaTime(){ return deltaTime * 0.001f; } }

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