InputSystem.java revision 2b1168acefb6a4104bb7f008df6ac51fcd1de7ec 
1/*
2 * Copyright (C) 2010 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.replica.replicaisland;
18
19/**
20 * Manages input from a roller wheel and touch screen.  Reduces frequent UI messages to
21 * an average direction over a short period of time.
22 */
23public class InputSystem extends BaseObject {
24	private InputTouchScreen mTouchScreen = new InputTouchScreen();
25	private InputXY mOrientationSensor = new InputXY();
26	private InputXY mTrackball = new InputXY();
27    private InputKeyboard mKeyboard = new InputKeyboard();
28    private int mScreenRotation = 0;
29    private float mOrientationInput[] = new float[3];
30    private float mOrientationOutput[] = new float[3];
31
32    public InputSystem() {
33        super();
34        reset();
35    }
36
37    @Override
38    public void reset() {
39    	mTrackball.reset();
40    	mTouchScreen.reset();
41    	mKeyboard.resetAll();
42    	mOrientationSensor.reset();
43    }
44
45    public void roll(float x, float y) {
46        TimeSystem time = sSystemRegistry.timeSystem;
47    	mTrackball.press(time.getGameTime(), mTrackball.getX() + x, mTrackball.getY() + y);
48    }
49
50    public void touchDown(int index, float x, float y) {
51	   ContextParameters params = sSystemRegistry.contextParameters;
52	   TimeSystem time = sSystemRegistry.timeSystem;
53	   // Change the origin of the touch location from the top-left to the bottom-left to match
54	   // OpenGL space.
55	   // TODO: UNIFY THIS SHIT
56	   mTouchScreen.press(index, time.getGameTime(), x, params.gameHeight - y);
57    }
58
59    public void touchUp(int index, float x, float y) {
60    	// TODO: record up location?
61    	mTouchScreen.release(index);
62    }
63
64
65    public void setOrientation(float x, float y, float z) {
66    	// The order of orientation axes changes depending on the rotation of the screen.
67    	// Some devices call landscape "ROTAION_90" (e.g. phones), while others call it
68    	// "ROTATION_0" (e.g. tablets).  So we need to adjust the axes from canonical
69    	// space into screen space depending on the rotation of the screen from
70    	// whatever this device calls "default."
71    	mOrientationInput[0] = x;
72    	mOrientationInput[1] = y;
73    	mOrientationInput[2] = z;
74
75    	canonicalOrientationToScreenOrientation(mScreenRotation, mOrientationInput, mOrientationOutput);
76
77    	// Now we have screen space rotations around xyz.
78    	final float horizontalMotion = mOrientationOutput[1] / 90.0f;
79        final float verticalMotion = mOrientationOutput[0] / 90.0f;
80
81        TimeSystem time = sSystemRegistry.timeSystem;
82        mOrientationSensor.press(time.getGameTime(), horizontalMotion, verticalMotion);
83
84    }
85
86    public void keyDown(int keycode) {
87    	TimeSystem time = sSystemRegistry.timeSystem;
88        final float gameTime = time.getGameTime();
89        mKeyboard.press(gameTime, keycode);
90    }
91
92    public void keyUp(int keycode) {
93    	mKeyboard.release(keycode);
94    }
95
96    public void releaseAllKeys() {
97    	mTrackball.releaseX();
98    	mTrackball.releaseY();
99    	mTouchScreen.resetAll();
100    	mKeyboard.releaseAll();
101    	mOrientationSensor.release();
102    }
103
104	public InputTouchScreen getTouchScreen() {
105		return mTouchScreen;
106	}
107
108	public InputXY getOrientationSensor() {
109		return mOrientationSensor;
110	}
111
112	public InputXY getTrackball() {
113		return mTrackball;
114	}
115
116	public InputKeyboard getKeyboard() {
117		return mKeyboard;
118	}
119
120	public void setScreenRotation(int rotation) {
121		mScreenRotation = rotation;
122	}
123
124	// Thanks to NVIDIA for this useful canonical-to-screen orientation function.
125	// More here: http://developer.download.nvidia.com/tegra/docs/tegra_android_accelerometer_v5f.pdf
126	static void canonicalOrientationToScreenOrientation(
127			int displayRotation, float[] canVec, float[] screenVec) {
128		final int axisSwap[][] = {
129			{ 1, -1, 0, 1 },   // ROTATION_0
130			{-1, -1, 1, 0 },   // ROTATION_90
131			{-1,  1, 0, 1 },   // ROTATION_180
132			{ 1,  1, 1, 0 } }; // ROTATION_270
133
134		final int[] as = axisSwap[displayRotation];
135		screenVec[0] = (float)as[0] * canVec[ as[2] ];
136		screenVec[1] = (float)as[1] * canVec[ as[3] ];
137		screenVec[2] = canVec[2];
138	}
139
140
141
142}
143