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
17package com.android.testapp;
18
19import android.util.Log;
20import android.renderscript.Float3;
21import com.android.scenegraph.*;
22import com.android.scenegraph.CompoundTransform.RotateComponent;
23import com.android.scenegraph.CompoundTransform.TranslateComponent;
24
25public 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
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
63    public Camera getCamera() {
64        return mCamera;
65    }
66
67    public void onActionDown(float x, float y) {
68        mLastX = x;
69        mLastY = y;
70    }
71
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
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