Android example source code file (Layer.java)

This example Android source code file (Layer.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" ^TM.

Java - Android tags/keywords

glshape, layer, m4

The Layer.java Android example source code

/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.example.android.apis.graphics.kube;

public class Layer {
	
	public Layer(int axis) {
		// start with identity matrix for transformation
		mAxis = axis;
		mTransform.setIdentity();
	}
	
	public void startAnimation() {
		for (int i = 0; i < mShapes.length; i++) {
			GLShape shape = mShapes[i];
			if (shape != null) {
				shape.startAnimation();
			}	
		}
	}

	public void endAnimation() {
		for (int i = 0; i < mShapes.length; i++) {
			GLShape shape = mShapes[i];
			if (shape != null) {
				shape.endAnimation();
			}	
		}
	}
	
	public void setAngle(float angle) {
		// normalize the angle
		float twopi = (float)Math.PI *2f;
		while (angle >= twopi) angle -= twopi;
		while (angle < 0f) angle += twopi;
//		mAngle = angle;
		
		float sin = (float)Math.sin(angle);
		float cos = (float)Math.cos(angle);
		
		float[][] m = mTransform.m;
		switch (mAxis) {
			case kAxisX:
				m[1][1] = cos;
				m[1][2] = sin;
				m[2][1] = -sin;
				m[2][2] = cos;
				m[0][0] = 1f;
				m[0][1] = m[0][2] = m[1][0] = m[2][0] = 0f;
				break;
			case kAxisY:
				m[0][0] = cos;
				m[0][2] = sin;
				m[2][0] = -sin;
				m[2][2] = cos;
				m[1][1] = 1f;
				m[0][1] = m[1][0] = m[1][2] = m[2][1] = 0f;
				break;
			case kAxisZ:
				m[0][0] = cos;
				m[0][1] = sin;
				m[1][0] = -sin;
				m[1][1] = cos;
				m[2][2] = 1f;
				m[2][0] = m[2][1] = m[0][2] = m[1][2] = 0f;
				break;
		}
		
		for (int i = 0; i < mShapes.length; i++) {
			GLShape shape = mShapes[i];
			if (shape != null) {
				shape.animateTransform(mTransform);
			}
		}
	}
	
	GLShape[] mShapes = new GLShape[9];
	M4 mTransform = new M4();
//	float mAngle;

	// which axis do we rotate around?
	// 0 for X, 1 for Y, 2 for Z
	int mAxis;
	static public final int kAxisX = 0;
	static public final int kAxisY = 1;
	static public final int kAxisZ = 2;	
}