1 /* 2 * Copyright (C) 2006 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 android.graphics; 18 19 /** 20 * A camera instance can be used to compute 3D transformations and 21 * generate a matrix that can be applied, for instance, on a 22 * {@link Canvas}. 23 */ 24 public class Camera { 25 private Matrix mMatrix; 26 27 /** 28 * Creates a new camera, with empty transformations. 29 */ 30 public Camera() { 31 nativeConstructor(); 32 } 33 34 /** 35 * Saves the camera state. Each save should be balanced 36 * with a call to {@link #restore()}. 37 * 38 * @see #save() 39 */ 40 public native void save(); 41 42 /** 43 * Restores the saved state, if any. 44 * 45 * @see #restore() 46 */ 47 public native void restore(); 48 49 /** 50 * Applies a translation transform on all three axis. 51 * 52 * @param x The distance to translate by on the X axis 53 * @param y The distance to translate by on the Y axis 54 * @param z The distance to translate by on the Z axis 55 */ 56 public native void translate(float x, float y, float z); 57 58 /** 59 * Applies a rotation transform around the X axis. 60 * 61 * @param deg The angle of rotation around the X axis, in degrees 62 * 63 * @see #rotateY(float) 64 * @see #rotateZ(float) 65 * @see #rotate(float, float, float) 66 */ 67 public native void rotateX(float deg); 68 69 /** 70 * Applies a rotation transform around the Y axis. 71 * 72 * @param deg The angle of rotation around the Y axis, in degrees 73 * 74 * @see #rotateX(float) 75 * @see #rotateZ(float) 76 * @see #rotate(float, float, float) 77 */ 78 public native void rotateY(float deg); 79 80 /** 81 * Applies a rotation transform around the Z axis. 82 * 83 * @param deg The angle of rotation around the Z axis, in degrees 84 * 85 * @see #rotateX(float) 86 * @see #rotateY(float) 87 * @see #rotate(float, float, float) 88 */ 89 public native void rotateZ(float deg); 90 91 /** 92 * Applies a rotation transform around all three axis. 93 * 94 * @param x The angle of rotation around the X axis, in degrees 95 * @param y The angle of rotation around the Y axis, in degrees 96 * @param z The angle of rotation around the Z axis, in degrees 97 * 98 * @see #rotateX(float) 99 * @see #rotateY(float) 100 * @see #rotateZ(float) 101 */ 102 public native void rotate(float x, float y, float z); 103 104 /** 105 * Gets the x location of the camera. 106 * 107 * @see #setLocation(float, float, float) 108 */ 109 public native float getLocationX(); 110 111 /** 112 * Gets the y location of the camera. 113 * 114 * @see #setLocation(float, float, float) 115 */ 116 public native float getLocationY(); 117 118 /** 119 * Gets the z location of the camera. 120 * 121 * @see #setLocation(float, float, float) 122 */ 123 public native float getLocationZ(); 124 125 /** 126 * Sets the location of the camera. The default location is set at 127 * 0, 0, -8. 128 * 129 * @param x The x location of the camera 130 * @param y The y location of the camera 131 * @param z The z location of the camera 132 */ 133 public native void setLocation(float x, float y, float z); 134 135 /** 136 * Computes the matrix corresponding to the current transformation 137 * and copies it to the supplied matrix object. 138 * 139 * @param matrix The matrix to copy the current transforms into 140 */ 141 public void getMatrix(Matrix matrix) { 142 nativeGetMatrix(matrix.native_instance); 143 } 144 145 /** 146 * Computes the matrix corresponding to the current transformation 147 * and applies it to the specified Canvas. 148 * 149 * @param canvas The Canvas to set the transform matrix onto 150 */ 151 public void applyToCanvas(Canvas canvas) { 152 if (canvas.isHardwareAccelerated()) { 153 if (mMatrix == null) mMatrix = new Matrix(); 154 getMatrix(mMatrix); 155 canvas.concat(mMatrix); 156 } else { 157 nativeApplyToCanvas(canvas.getNativeCanvasWrapper()); 158 } 159 } 160 161 public native float dotWithNormal(float dx, float dy, float dz); 162 163 protected void finalize() throws Throwable { 164 try { 165 nativeDestructor(); 166 native_instance = 0; 167 } finally { 168 super.finalize(); 169 } 170 } 171 172 private native void nativeConstructor(); 173 private native void nativeDestructor(); 174 private native void nativeGetMatrix(long native_matrix); 175 private native void nativeApplyToCanvas(long native_canvas); 176 177 long native_instance; 178 } 179
