Wrapper activity demonstrating the use of the new SensorEvent rotation vector sensor, Sensor#TYPE_ROTATION_VECTOR TYPE_ROTATION_VECTOR}).
/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.example.android.apis.os;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;
import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.opengles.GL10;
import android.app.Activity;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.opengl.GLSurfaceView;
import android.os.Bundle;
/**
* Wrapper activity demonstrating the use of the new
* {@link SensorEvent#values rotation vector sensor}
* ({@link Sensor#TYPE_ROTATION_VECTOR TYPE_ROTATION_VECTOR}).
*
* @see Sensor
* @see SensorEvent
* @see SensorManager
*
*/
public class RotationVectorDemo extends Activity {
private GLSurfaceView mGLSurfaceView;
private SensorManager mSensorManager;
private MyRenderer mRenderer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Get an instance of the SensorManager
mSensorManager = (SensorManager)getSystemService(SENSOR_SERVICE);
// Create our Preview view and set it as the content of our
// Activity
mRenderer = new MyRenderer();
mGLSurfaceView = new GLSurfaceView(this);
mGLSurfaceView.setRenderer(mRenderer);
setContentView(mGLSurfaceView);
}
@Override
protected void onResume() {
// Ideally a game should implement onResume() and onPause()
// to take appropriate action when the activity looses focus
super.onResume();
mRenderer.start();
mGLSurfaceView.onResume();
}
@Override
protected void onPause() {
// Ideally a game should implement onResume() and onPause()
// to take appropriate action when the activity looses focus
super.onPause();
mRenderer.stop();
mGLSurfaceView.onPause();
}
class MyRenderer implements GLSurfaceView.Renderer, SensorEventListener {
private Cube mCube;
private Sensor mRotationVectorSensor;
private final float[] mRotationMatrix = new float[16];
public MyRenderer() {
// find the rotation-vector sensor
mRotationVectorSensor = mSensorManager.getDefaultSensor(
Sensor.TYPE_ROTATION_VECTOR);
mCube = new Cube();
// initialize the rotation matrix to identity
mRotationMatrix[ 0] = 1;
mRotationMatrix[ 4] = 1;
mRotationMatrix[ 8] = 1;
mRotationMatrix[12] = 1;
}
public void start() {
// enable our sensor when the activity is resumed, ask for
// 10 ms updates.
mSensorManager.registerListener(this, mRotationVectorSensor, 10000);
}
public void stop() {
// make sure to turn our sensor off when the activity is paused
mSensorManager.unregisterListener(this);
}
public void onSensorChanged(SensorEvent event) {
// we received a sensor event. it is a good practice to check
// that we received the proper event
if (event.sensor.getType() == Sensor.TYPE_ROTATION_VECTOR) {
// convert the rotation-vector to a 4x4 matrix. the matrix
// is interpreted by Open GL as the inverse of the
// rotation-vector, which is what we want.
SensorManager.getRotationMatrixFromVector(
mRotationMatrix , event.values);
}
}
public void onDrawFrame(GL10 gl) {
// clear screen
gl.glClear(GL10.GL_COLOR_BUFFER_BIT);
// set-up modelview matrix
gl.glMatrixMode(GL10.GL_MODELVIEW);
gl.glLoadIdentity();
gl.glTranslatef(0, 0, -3.0f);
gl.glMultMatrixf(mRotationMatrix, 0);
// draw our object
gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
gl.glEnableClientState(GL10.GL_COLOR_ARRAY);
mCube.draw(gl);
}
public void onSurfaceChanged(GL10 gl, int width, int height) {
// set view-port
gl.glViewport(0, 0, width, height);
// set projection matrix
float ratio = (float) width / height;
gl.glMatrixMode(GL10.GL_PROJECTION);
gl.glLoadIdentity();
gl.glFrustumf(-ratio, ratio, -1, 1, 1, 10);
}
public void onSurfaceCreated(GL10 gl, EGLConfig config) {
// dither is enabled by default, we don't need it
gl.glDisable(GL10.GL_DITHER);
// clear screen in white
gl.glClearColor(1,1,1,1);
}
class Cube {
// initialize our cube
private FloatBuffer mVertexBuffer;
private FloatBuffer mColorBuffer;
private ByteBuffer mIndexBuffer;
public Cube() {
final float vertices[] = {
-1, -1, -1, 1, -1, -1,
1, 1, -1, -1, 1, -1,
-1, -1, 1, 1, -1, 1,
1, 1, 1, -1, 1, 1,
};
final float colors[] = {
0, 0, 0, 1, 1, 0, 0, 1,
1, 1, 0, 1, 0, 1, 0, 1,
0, 0, 1, 1, 1, 0, 1, 1,
1, 1, 1, 1, 0, 1, 1, 1,
};
final byte indices[] = {
0, 4, 5, 0, 5, 1,
1, 5, 6, 1, 6, 2,
2, 6, 7, 2, 7, 3,
3, 7, 4, 3, 4, 0,
4, 7, 6, 4, 6, 5,
3, 0, 1, 3, 1, 2
};
ByteBuffer vbb = ByteBuffer.allocateDirect(vertices.length*4);
vbb.order(ByteOrder.nativeOrder());
mVertexBuffer = vbb.asFloatBuffer();
mVertexBuffer.put(vertices);
mVertexBuffer.position(0);
ByteBuffer cbb = ByteBuffer.allocateDirect(colors.length*4);
cbb.order(ByteOrder.nativeOrder());
mColorBuffer = cbb.asFloatBuffer();
mColorBuffer.put(colors);
mColorBuffer.position(0);
mIndexBuffer = ByteBuffer.allocateDirect(indices.length);
mIndexBuffer.put(indices);
mIndexBuffer.position(0);
}
public void draw(GL10 gl) {
gl.glEnable(GL10.GL_CULL_FACE);
gl.glFrontFace(GL10.GL_CW);
gl.glShadeModel(GL10.GL_SMOOTH);
gl.glVertexPointer(3, GL10.GL_FLOAT, 0, mVertexBuffer);
gl.glColorPointer(4, GL10.GL_FLOAT, 0, mColorBuffer);
gl.glDrawElements(GL10.GL_TRIANGLES, 36, GL10.GL_UNSIGNED_BYTE, mIndexBuffer);
}
}
public void onAccuracyChanged(Sensor sensor, int accuracy) {
}
}
}
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