单次轨迹回放

Posted 2022-07-28 ly570

已知有一段轨迹数据，点击回放按钮，小车沿着路线自动的往前运动，播放完毕也就结束了

public class MoveSingleThread extends Thread
private List<LatLng> mLatLngList;
private Marker mCarMarker;
public MoveSingleThread(List<LatLng> latLngs, Marker marker)
super();
mLatLngList = latLngs;
mCarMarker = marker;

@Override
public void run()
super.run();

public void moveTrack()
// 第一个for循环用来计算走了多少部
int step = 0;
for (int i = 0; i < mLatLngList.size() - 1; i++)
LatLng startPoint = mLatLngList.get(i);
LatLng endPoint = mLatLngList.get(i + 1);
double slope = getSlope(startPoint, endPoint);
// 是不是正向的标示（向上设为正向）
boolean isReverse = (startPoint.latitude > endPoint.latitude);
double xMoveDistance = isReverse ? getXMoveDistance(slope) : -1 * getXMoveDistance(slope);
// 应该对经纬度同时处理
for (double j = startPoint.latitude; !((j >= endPoint.latitude) ^ isReverse); j =
j - xMoveDistance)
step++;

// 通过距离,计算轨迹动画时间间隔
double mTimeInterval = 0;// 轨迹回放时间戳
if (!TextUtils.isEmpty(mDistance))
float totalDistance = Float.parseFloat(mDistance) * 1000;
if (totalDistance <= 500)
mTimeInterval = 1000.0 / step;
else if (totalDistance > 500 && totalDistance <= 7500)
mTimeInterval = 2.0 * totalDistance / step;
else
mTimeInterval = 15000.0 / step;

// while (true)
for (int i = 0; i < mLatLngList.size() - 1; i++)
if (stopFlag)
stopFlag = false;
break;

mIsCarMoveing = true;
LatLng startPoint = mLatLngList.get(i);
LatLng endPoint = mLatLngList.get(i + 1);
mCarMarker.setPosition(startPoint);
mCarMarker.setRotateAngle((float) getAngle(startPoint, endPoint));
double slope = getSlope(startPoint, endPoint);
// 是不是正向的标示（向上设为正向）
boolean isReverse = (startPoint.latitude > endPoint.latitude);
double intercept = getInterception(slope, startPoint);
double xMoveDistance = isReverse ? getXMoveDistance(slope) : -1 * getXMoveDistance(slope);
// 应该对经纬度同时处理
double mSleep = 0;
for (double j = startPoint.latitude; !((j >= endPoint.latitude) ^ isReverse); j =
j - xMoveDistance)
LatLng latLng = null;
if (slope != Double.MAX_VALUE)
latLng = new LatLng(j, (j - intercept) / slope);
// latLng = new LatLng(j, k);
else
latLng = new LatLng(j, startPoint.longitude);

mCarMarker.setPosition(latLng);
// 如果间隔时间小于1毫秒,则略过当前休眠,累加直到休眠时间到1毫秒:会损失精度
if (mTimeInterval < 1)
mSleep += mTimeInterval;
if (mSleep >= 1)
SystemClock.sleep((long) mSleep);
mSleep = 0;

else
SystemClock.sleep((long) mTimeInterval);