1 /*
2  * Copyright (C) 2011 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.android.testapp;
18 
19 import android.util.Log;
20 import android.renderscript.Float3;
21 import com.android.scenegraph.*;
22 import com.android.scenegraph.CompoundTransform.RotateComponent;
23 import com.android.scenegraph.CompoundTransform.TranslateComponent;
24 
25 public class TouchHandler {
26     private static String TAG = "TouchHandler";
27 
28     float mLastX;
29     float mLastY;
30 
31     float mRotateXValue;
32     float mRotateYValue;
33     Float3 mDistValue;
34     Float3 mPosValue;
35 
36     CompoundTransform mCameraRig;
37     RotateComponent mRotateX;
38     RotateComponent mRotateY;
39     TranslateComponent mDist;
40     TranslateComponent mPosition;
41     Camera mCamera;
42 
init(Scene scene)43     public void init(Scene scene) {
44         // Some initial values for camera position
45         mRotateXValue = -20;
46         mRotateYValue = 0;
47         mDistValue = new Float3(0, 0, 45);
48         mPosValue = new Float3(0, 4, 0);
49 
50         // Make a camera transform we can manipulate
51         mCameraRig = scene.appendNewCompoundTransform();
52         mCameraRig.setName("CameraRig");
53 
54         mPosition = mCameraRig.addTranslate("Position", mPosValue);
55         mRotateY  = mCameraRig.addRotate("RotateY", new Float3(0, 1, 0), mRotateYValue);
56         mRotateX  = mCameraRig.addRotate("RotateX", new Float3(1, 0, 0), mRotateXValue);
57         mDist     = mCameraRig.addTranslate("Distance", mDistValue);
58 
59         mCamera = scene.appendNewCamera();
60         mCamera.setTransform(mCameraRig);
61     }
62 
getCamera()63     public Camera getCamera() {
64         return mCamera;
65     }
66 
onActionDown(float x, float y)67     public void onActionDown(float x, float y) {
68         mLastX = x;
69         mLastY = y;
70     }
71 
onActionScale(float scale)72     public void onActionScale(float scale) {
73         if (mDist == null) {
74             return;
75         }
76         mDistValue.z *= 1.0f / scale;
77         mDistValue.z = Math.max(10.0f, Math.min(mDistValue.z, 150.0f));
78         mDist.setValue(mDistValue);
79     }
80 
onActionMove(float x, float y)81     public void onActionMove(float x, float y) {
82         if (mRotateX == null) {
83             return;
84         }
85 
86         float dx = mLastX - x;
87         float dy = mLastY - y;
88 
89         if (Math.abs(dy) <= 2.0f) {
90             dy = 0.0f;
91         }
92         if (Math.abs(dx) <= 2.0f) {
93             dx = 0.0f;
94         }
95 
96         mRotateYValue += dx * 0.25f;
97         mRotateYValue %= 360.0f;
98 
99         mRotateXValue  += dy * 0.25f;
100         mRotateXValue  = Math.max(mRotateXValue , -80.0f);
101         mRotateXValue  = Math.min(mRotateXValue , 0.0f);
102 
103         mRotateX.setAngle(mRotateXValue);
104         mRotateY.setAngle(mRotateYValue);
105 
106         mLastX = x;
107         mLastY = y;
108     }
109 }
110