Java 弹回机器人
我举了一个带有SensorManager的加速器的例子,在这个例子中,画布(球)会随着设备的旋转而更新其位置。以下是图片: 如图所示,有一个球和一条线。球的位置经常更新,而线的位置是静态的 我想让球在触线时反弹回来。从3天开始我就试过了,但不明白我怎么能做到这一点 这是我的代码:Java 弹回机器人,java,android,accelerator,Java,Android,Accelerator,我举了一个带有SensorManager的加速器的例子,在这个例子中,画布(球)会随着设备的旋转而更新其位置。以下是图片: 如图所示,有一个球和一条线。球的位置经常更新,而线的位置是静态的 我想让球在触线时反弹回来。从3天开始我就试过了,但不明白我怎么能做到这一点 这是我的代码: public class ballsensor extends Activity implements SensorEventListener { // sensor-related private
public class ballsensor extends Activity implements SensorEventListener {
// sensor-related
private SensorManager mSensorManager;
private Sensor mAccelerometer;
// animated view
private ShapeView mShapeView;
// screen size
private int mWidthScreen;
private int mHeightScreen;
// motion parameters
private final float FACTOR_FRICTION = 0.5f; // imaginary friction on the
// screen
private final float GRAVITY = 9.8f; // acceleration of gravity
private float mAx; // acceleration along x axis
private float mAy; // acceleration along y axis
private final float mDeltaT = 0.5f; // imaginary time interval between each
// acceleration updates
// timer
private Timer mTimer;
private Handler mHandler;
private boolean isTimerStarted = false;
private long mStart;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// set the screen always portait
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
// initializing sensors
mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
mAccelerometer = mSensorManager
.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
// obtain screen width and height
Display display = ((WindowManager) this
.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
mWidthScreen = display.getWidth();
mHeightScreen = display.getHeight() - 35;
// initializing the view that renders the ball
mShapeView = new ShapeView(this);
mShapeView.setOvalCenter((int) (mWidthScreen * 0.6),
(int) (mHeightScreen * 0.6));
setContentView(mShapeView);
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
}
@Override
public void onSensorChanged(SensorEvent event) {
// obtain the three accelerations from sensors
mAx = event.values[0];
mAy = event.values[1];
float mAz = event.values[2];
// taking into account the frictions
mAx = Math.signum(mAx) * Math.abs(mAx)
* (1 - FACTOR_FRICTION * Math.abs(mAz) / GRAVITY);
mAy = Math.signum(mAy) * Math.abs(mAy)
* (1 - FACTOR_FRICTION * Math.abs(mAz) / GRAVITY);
}
@Override
protected void onResume() {
super.onResume();
// start sensor sensing
mSensorManager.registerListener(this, mAccelerometer,
SensorManager.SENSOR_DELAY_NORMAL);
}
@Override
protected void onPause() {
super.onPause();
// stop senser sensing
mSensorManager.unregisterListener(this);
}
// the view that renders the ball
private class ShapeView extends SurfaceView implements
SurfaceHolder.Callback {
private final int RADIUS = 30;
private final float FACTOR_BOUNCEBACK = 0.50f;
private int mXCenter;
private int mYCenter;
private RectF mRectF;
private final Paint mPaint;
private ShapeThread mThread;
private float mVx;
private float mVy;
public ShapeView(Context context) {
super(context);
getHolder().addCallback(this);
mThread = new ShapeThread(getHolder(), this);
setFocusable(true);
mPaint = new Paint();
mPaint.setColor(0xFFFFFFFF);
mPaint.setAlpha(192);
mPaint.setStyle(Paint.Style.FILL_AND_STROKE);
mPaint.setAntiAlias(true);
mRectF = new RectF();
}
// set the position of the ball
public boolean setOvalCenter(int x, int y) {
mXCenter = x;
mYCenter = y;
return true;
}
// calculate and update the ball's position
public boolean updateOvalCenter() {
mVx -= mAx * mDeltaT;
mVy += mAy * mDeltaT;
System.out.println("mVx is ::" + mVx);
System.out.println("mVy is ::" + mVy);
mXCenter += (int) (mDeltaT * (mVx + 0.6 * mAx * mDeltaT));
mYCenter += (int) (mDeltaT * (mVy + 0.6 * mAy * mDeltaT));
if (mXCenter < RADIUS) {
mXCenter = RADIUS;
mVx = -mVx * FACTOR_BOUNCEBACK;
}
if (mYCenter < RADIUS) {
mYCenter = RADIUS;
mVy = -mVy * FACTOR_BOUNCEBACK;
}
if (mXCenter > mWidthScreen - RADIUS) {
mXCenter = mWidthScreen - RADIUS;
mVx = -mVx * FACTOR_BOUNCEBACK;
}
if (mYCenter > mHeightScreen - 2 * RADIUS) {
mYCenter = mHeightScreen - 2 * RADIUS;
mVy = -mVy * FACTOR_BOUNCEBACK;
}
return true;
}
// update the canvas.
@Override
protected void onDraw(Canvas canvas) {
if (mRectF != null) {
mRectF.set(mXCenter - RADIUS, mYCenter - RADIUS, mXCenter
+ RADIUS, mYCenter + RADIUS);
canvas.drawColor(0XFF000000);
// canvas.drawOval(mRectF, mPaint);
Bitmap kangoo = BitmapFactory.decodeResource(getResources(),
R.drawable.stripe1);
Bitmap ball = BitmapFactory.decodeResource(getResources(),
R.drawable.blackwhiteball);
canvas.drawBitmap(ball, mXCenter - RADIUS, mYCenter - RADIUS,
mPaint);
canvas.drawBitmap(kangoo, 130, 10, null);
}
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
mThread.setRunning(true);
mThread.start();
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
boolean retry = true;
mThread.setRunning(false);
while (retry) {
try {
mThread.join();
retry = false;
} catch (InterruptedException e) {
}
}
}
}
class ShapeThread extends Thread {
private SurfaceHolder mSurfaceHolder;
private ShapeView mShapeView;
private boolean mRun = false;
public ShapeThread(SurfaceHolder surfaceHolder, ShapeView shapeView) {
mSurfaceHolder = surfaceHolder;
mShapeView = shapeView;
}
public void setRunning(boolean run) {
mRun = run;
}
public SurfaceHolder getSurfaceHolder() {
return mSurfaceHolder;
}
@Override
public void run() {
Canvas c;
while (mRun) {
mShapeView.updateOvalCenter();
c = null;
try {
c = mSurfaceHolder.lockCanvas(null);
synchronized (mSurfaceHolder) {
mShapeView.onDraw(c);
}
} finally {
if (c != null) {
mSurfaceHolder.unlockCanvasAndPost(c);
}
}
}
}
}
}
公共类ballsensor扩展活动实现SensorEventListener{
//传感器相关
私人传感器管理器;
专用传感器mAccelerometer;
//动画视图
私人ShapeView mShapeView;
//屏幕大小
私人int mWidthScreen;
私人国际mHeightScreen;
//运动参数
私人最终浮动系数_摩擦力=0.5f;//在地面上的假想摩擦力
//屏风
私人最终浮子重力=9.8f;//重力加速度
private float mAx;//沿x轴的加速度
私有浮动可能;//沿y轴的加速度
私有最终浮点值mdelat=0.5f;//每个浮点值之间的假想时间间隔
//加速更新
//计时器
私人定时器;
私人经理人;
private boolean isTimerStarted=false;
私人长mStart;
@凌驾
创建时的公共void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
//将屏幕设置为始终打开它
setRequestedOrientation(ActivityInfo.SCREEN\u ORIENTATION\u Picture);
//初始化传感器
msSensorManager=(SensorManager)getSystemService(传感器服务);
mAccelerometer=传感器管理器
.getDefaultSensor(传感器类型\加速计);
//获取屏幕宽度和高度
Display Display=((WindowManager)此
.getSystemService(Context.WINDOW_服务)).getDefaultDisplay();
mWidthScreen=display.getWidth();
mHeightScreen=display.getHeight()-35;
//初始化渲染球的视图
mShapeView=新的ShapeView(此);
mShapeView.setOvalCenter((int)(mWidthScreen*0.6),
(国际)(mHeightScreen*0.6));
setContentView(mShapeView);
}
@凌驾
精度更改时的公共无效(传感器,int精度){
}
@凌驾
传感器更改时的公共无效(传感器事件){
//从传感器获取三个加速度
最大值=事件值[0];
mAy=事件值[1];
float mAz=事件值[2];
//考虑到摩擦
mAx=数学符号(mAx)*数学绝对值(mAx)
*(1-摩擦系数*数学abs(mAz)/重力);
五月=数学符号(五月)*数学符号(五月)
*(1-摩擦系数*数学abs(mAz)/重力);
}
@凌驾
受保护的void onResume(){
super.onResume();
//起动传感器感应
mSensorManager.registerListener(这是mAccelerometer,
传感器管理器。传感器延迟(正常);
}
@凌驾
受保护的void onPause(){
super.onPause();
//停止传感器感测
mSensorManager.unregisterListener(此);
}
//渲染球的视图
私有类ShapeView扩展了SurfaceView实现
SurfaceHolder,回拨{
私有最终整数半径=30;
私人最终浮动系数_反弹=0.50f;
私立国际培训中心;
迈斯中心私人酒店;
私有RectF mRectF;
私人最终油漆;
私有ShapeThread mThread;
私有浮动mVx;
私人浮动mVy;
公共形状视图(上下文){
超级(上下文);
getHolder().addCallback(此);
mThread=newshapethread(getHolder(),this);
设置聚焦(真);
mPaint=新油漆();
mPaint.setColor(0xFFFFFFFF);
mPaint.setAlpha(192);
mPaint.setStyle(绘制、样式、填充和笔划);
mPaint.setAntiAlias(true);
mRectF=新的RectF();
}
//设定球的位置
公共布尔值setOvalCenter(整数x,整数y){
mXCenter=x;
mYCenter=y;
返回true;
}
//计算并更新球的位置
公共布尔值updateOvalCenter(){
mVx-=最大值*mdelat;
mVy+=mAy*Mdelat;
System.out.println(“mVx是::”+mVx);
System.out.println(“mVy为::”+mVy);
mXCenter+=(int)(mDelat*(mVx+0.6*最大值*mDelat));
mYCenter+=(int)(mdelat*(mVy+0.6*五月*mdelat));
如果(中心<半径){
mx中心=半径;
mVx=-mVx*因子_反弹;
}
如果(中心<半径){
菌丝中心=半径;
mVy=-mVy*因子_反弹;
}
如果(mXCenter>mWidthScreen-半径){
mXCenter=mWidthScreen—半径;
mVx=-mVx*因子_反弹;
}
如果(mYCenter>mHeightScreen-2*半径){
mYCenter=mHeightScreen-2*半径;
mVy=-mVy*因子_反弹;
}
返回true;
}
//更新画布。
@凌驾
受保护的void onDraw(画布){
如果(mRectF!=null){
mRectF.set(mXCenter-RADIUS,mYCenter-RADIUS,mXCenter
+半径,中心+半径);
canvas.drawColor(0XFF000000);
//帆布。drawOval(mRectF,mPaint);
位图kangoo=BitmapFactory.decodeResource(getResources(),
R.可拉拔条1);
位图球
lastFrameTime = System.currentTimeMillis();
// as long as we run we move
while (state == GameState.RUNNING) {
currentFrame++;
timeNow = System.currentTimeMillis();
// sleep until this frame is scheduled
long l = lastFrameTime + FRAME_DELAY - timeNow;
updatePositions();
redraw();
if (l > 0L) {
try {
Thread.sleep(l);
}
catch (Exception exception) {
}
} else {
// something long kept us from updating, reset delays
lastFrameTime = timeNow;
l = FRAME_DELAY;
}
lastFrameTime = timeNow + l;
// be polite, let others play
Thread.yield();
}
import java.util.Timer;
import android.app.Activity;
import android.content.Context;
import android.content.pm.ActivityInfo;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.RectF;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.os.Handler;
import android.view.Display;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.WindowManager;
public class ballsensor extends Activity implements SensorEventListener {
// sensor-related
private SensorManager mSensorManager;
private Sensor mAccelerometer;
// animated view
private ShapeView mShapeView;
// screen size
private int mWidthScreen;
private int mHeightScreen;
// motion parameters
private final float FACTOR_FRICTION = 0.5f; // imaginary friction on the
// screen
private final float GRAVITY = 9.8f; // acceleration of gravity
private float mAx; // acceleration along x axis
private float mAy; // acceleration along y axis
private final float mDeltaT = 0.5f; // imaginary time interval between each
// acceleration updates
// timer
private Timer mTimer;
private Handler mHandler;
private final boolean isTimerStarted = false;
private long mStart;
@Override
public void onCreate(final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// set the screen always portait
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
// initializing sensors
mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
mAccelerometer = mSensorManager
.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
// obtain screen width and height
final Display display = ((WindowManager) this
.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
mWidthScreen = display.getWidth();
mHeightScreen = display.getHeight() - 35;
// initializing the view that renders the ball
mShapeView = new ShapeView(this);
mShapeView.setOvalCenter((int) (mWidthScreen * 0.6),
(int) (mHeightScreen * 0.6));
setContentView(mShapeView);
}
@Override
public void onAccuracyChanged(final Sensor sensor, final int accuracy) {
}
@Override
public void onSensorChanged(final SensorEvent event) {
// obtain the three accelerations from sensors
mAx = event.values[0];
mAy = event.values[1];
final float mAz = event.values[2];
// taking into account the frictions
mAx = Math.signum(mAx) * Math.abs(mAx)
* (1 - FACTOR_FRICTION * Math.abs(mAz) / GRAVITY);
mAy = Math.signum(mAy) * Math.abs(mAy)
* (1 - FACTOR_FRICTION * Math.abs(mAz) / GRAVITY);
}
@Override
protected void onResume() {
super.onResume();
// start sensor sensing
mSensorManager.registerListener(this, mAccelerometer,
SensorManager.SENSOR_DELAY_NORMAL);
}
@Override
protected void onPause() {
super.onPause();
// stop senser sensing
mSensorManager.unregisterListener(this);
}
// the view that renders the ball
private class ShapeView extends SurfaceView implements
SurfaceHolder.Callback {
private final int RADIUS = 30;
private final float FACTOR_BOUNCEBACK = 0.50f;
private int mXCenter;
private int mYCenter;
private final RectF mRectF;
private final Paint mPaint;
private final ShapeThread mThread;
private float mVx;
private float mVy;
private final Rect lineRect = new Rect();
private final Rect ballRect = new Rect();
public ShapeView(final Context context) {
super(context);
getHolder().addCallback(this);
mThread = new ShapeThread(getHolder(), this);
setFocusable(true);
mPaint = new Paint();
mPaint.setColor(0xFFFFFFFF);
mPaint.setAlpha(192);
mPaint.setStyle(Paint.Style.FILL_AND_STROKE);
mPaint.setAntiAlias(true);
mRectF = new RectF();
}
// set the position of the ball
public boolean setOvalCenter(final int x, final int y) {
mXCenter = x;
mYCenter = y;
return true;
}
// calculate and update the ball's position
public boolean updateOvalCenter() {
mVx -= mAx * mDeltaT;
mVy += mAy * mDeltaT;
System.out.println("mVx is ::" + mVx);
System.out.println("mVy is ::" + mVy);
mXCenter += (int) (mDeltaT * (mVx + 0.6 * mAx * mDeltaT));
mYCenter += (int) (mDeltaT * (mVy + 0.6 * mAy * mDeltaT));
if (mXCenter < RADIUS) {
mXCenter = RADIUS;
mVx = -mVx * FACTOR_BOUNCEBACK;
}
if (mYCenter < RADIUS) {
mYCenter = RADIUS;
mVy = -mVy * FACTOR_BOUNCEBACK;
}
if (mXCenter > mWidthScreen - RADIUS) {
mXCenter = mWidthScreen - RADIUS;
mVx = -mVx * FACTOR_BOUNCEBACK;
}
if (mYCenter > mHeightScreen - 2 * RADIUS) {
mYCenter = mHeightScreen - 2 * RADIUS;
mVy = -mVy * FACTOR_BOUNCEBACK;
}
if(Rect.intersects(lineRect, ballRect)){
mVx = -mVx * FACTOR_BOUNCEBACK;
mVy = -mVy * FACTOR_BOUNCEBACK;
mXCenter += (int) (mDeltaT * (mVx + 0.6 * mAx * mDeltaT)) * 5;
mYCenter += (int) (mDeltaT * (mVy + 0.6 * mAy * mDeltaT)) * 5;
}
return true;
}
// update the canvas.
@Override
protected void onDraw(final Canvas canvas) {
if (mRectF != null) {
mRectF.set(mXCenter - RADIUS, mYCenter - RADIUS, mXCenter
+ RADIUS, mYCenter + RADIUS);
canvas.drawColor(0XFF000000);
// canvas.drawOval(mRectF, mPaint);
final Bitmap kangoo = BitmapFactory.decodeResource(getResources(),
R.drawable.blankcard);
lineRect.set(130, 10, 130 + kangoo.getWidth(), 10 + kangoo.getHeight());
final Bitmap ball = BitmapFactory.decodeResource(getResources(),
R.drawable.blankcard);
ballRect.set(mXCenter - RADIUS, mYCenter - RADIUS, mXCenter - RADIUS + ball.getWidth(), mYCenter - RADIUS + ball.getHeight());
canvas.drawBitmap(ball, mXCenter - RADIUS, mYCenter - RADIUS,
mPaint);
canvas.drawBitmap(kangoo, 130, 10, null);
}
}
@Override
public void surfaceChanged(final SurfaceHolder holder, final int format, final int width,
final int height) {
}
@Override
public void surfaceCreated(final SurfaceHolder holder) {
mThread.setRunning(true);
mThread.start();
}
@Override
public void surfaceDestroyed(final SurfaceHolder holder) {
boolean retry = true;
mThread.setRunning(false);
while (retry) {
try {
mThread.join();
retry = false;
} catch (final InterruptedException e) {
}
}
}
}
class ShapeThread extends Thread {
private final SurfaceHolder mSurfaceHolder;
private final ShapeView mShapeView;
private boolean mRun = false;
public ShapeThread(final SurfaceHolder surfaceHolder, final ShapeView shapeView) {
mSurfaceHolder = surfaceHolder;
mShapeView = shapeView;
}
public void setRunning(final boolean run) {
mRun = run;
}
public SurfaceHolder getSurfaceHolder() {
return mSurfaceHolder;
}
@Override
public void run() {
Canvas c;
while (mRun) {
mShapeView.updateOvalCenter();
c = null;
try {
c = mSurfaceHolder.lockCanvas(null);
synchronized (mSurfaceHolder) {
mShapeView.onDraw(c);
}
} finally {
if (c != null) {
mSurfaceHolder.unlockCanvasAndPost(c);
}
}
}
}
}
}