1 /* 2 * Copyright (C) 2008 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.example.android.apis.graphics.kube; 18 19 public class Layer { 20 21 public Layer(int axis) { 22 // start with identity matrix for transformation 23 mAxis = axis; 24 mTransform.setIdentity(); 25 } 26 27 public void startAnimation() { 28 for (int i = 0; i < mShapes.length; i++) { 29 GLShape shape = mShapes[i]; 30 if (shape != null) { 31 shape.startAnimation(); 32 } 33 } 34 } 35 36 public void endAnimation() { 37 for (int i = 0; i < mShapes.length; i++) { 38 GLShape shape = mShapes[i]; 39 if (shape != null) { 40 shape.endAnimation(); 41 } 42 } 43 } 44 45 public void setAngle(float angle) { 46 // normalize the angle 47 float twopi = (float)Math.PI *2f; 48 while (angle >= twopi) angle -= twopi; 49 while (angle < 0f) angle += twopi; 50 // mAngle = angle; 51 52 float sin = (float)Math.sin(angle); 53 float cos = (float)Math.cos(angle); 54 55 float[][] m = mTransform.m; 56 switch (mAxis) { 57 case kAxisX: 58 m[1][1] = cos; 59 m[1][2] = sin; 60 m[2][1] = -sin; 61 m[2][2] = cos; 62 m[0][0] = 1f; 63 m[0][1] = m[0][2] = m[1][0] = m[2][0] = 0f; 64 break; 65 case kAxisY: 66 m[0][0] = cos; 67 m[0][2] = sin; 68 m[2][0] = -sin; 69 m[2][2] = cos; 70 m[1][1] = 1f; 71 m[0][1] = m[1][0] = m[1][2] = m[2][1] = 0f; 72 break; 73 case kAxisZ: 74 m[0][0] = cos; 75 m[0][1] = sin; 76 m[1][0] = -sin; 77 m[1][1] = cos; 78 m[2][2] = 1f; 79 m[2][0] = m[2][1] = m[0][2] = m[1][2] = 0f; 80 break; 81 } 82 83 for (int i = 0; i < mShapes.length; i++) { 84 GLShape shape = mShapes[i]; 85 if (shape != null) { 86 shape.animateTransform(mTransform); 87 } 88 } 89 } 90 91 GLShape[] mShapes = new GLShape[9]; 92 M4 mTransform = new M4(); 93 // float mAngle; 94 95 // which axis do we rotate around? 96 // 0 for X, 1 for Y, 2 for Z 97 int mAxis; 98 static public final int kAxisX = 0; 99 static public final int kAxisY = 1; 100 static public final int kAxisZ = 2; 101 } 102
