高德地图轨迹平滑移动改进demo

package com.yulin.gaodemapmovedemo; import android.graphics.Color; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.widget.Toast; import com.amap.api.maps.AMap; import com.amap.api.maps.CameraUpdateFactory; import com.amap.api.maps.MapView; import com.amap.api.maps.model.BitmapDescriptorFactory; import com.amap.api.maps.model.LatLng; import com.amap.api.maps.model.LatLngBounds; import com.amap.api.maps.model.Marker; import com.amap.api.maps.model.MarkerOptions; import com.amap.api.maps.model.Polyline; import com.amap.api.maps.model.PolylineOptions; /** * Created by YuLin on 2016/11/24 0024. */ public class MainActivity extends AppCompatActivity { private MapView mMapView; private AMap aMap; private Polyline mVirtualRoad; private Marker mMoveMarker; private static final int TIME_INTERVAL = 80; private static final double DISTANCE = 0.0001; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mMapView = (MapView) findViewById(R.id.map); mMapView.onCreate(savedInstanceState); aMap = mMapView.getMap(); initRoadData(); } private int i = 0; public void Start(View v) { Toast.makeText(this, "Start:" + i, Toast.LENGTH_SHORT).show(); moveLooper(mVirtualRoad.getPoints().get(i), mVirtualRoad.getPoints().get(i + 5)); i += 5; if(i >= mVirtualRoad.getPoints().size() - 6) i = 0; } private void initRoadData() { double centerLatitude = 39.916049; double centerLongitude = 116.399792; double deltaAngle = Math.PI / 180 * 5; double radius = 0.02; PolylineOptions polylineOptions = new PolylineOptions(); for (double i = 0; i < Math.PI * 2; i = i + deltaAngle) { float latitude = (float) (-Math.cos(i) * radius + centerLatitude); float longitude = (float) (Math.sin(i) * radius + centerLongitude); polylineOptions.add(new LatLng(latitude, longitude)); if (i > Math.PI) deltaAngle = Math.PI / 180 * 30; } float latitude = (float) (-Math.cos(0) * radius + centerLatitude); float longitude = (float) (Math.sin(0) * radius + centerLongitude); polylineOptions.add(new LatLng(latitude, longitude)); polylineOptions.width(0); polylineOptions.color(Color.RED); mVirtualRoad = aMap.addPolyline(polylineOptions); MarkerOptions markerOptions = new MarkerOptions(); markerOptions.setFlat(true); markerOptions.anchor(0.5f, 0.5f); markerOptions.icon(BitmapDescriptorFactory .fromResource(R.mipmap.icon_car)); markerOptions.position(new LatLng(latitude, longitude)); mMoveMarker = aMap.addMarker(markerOptions); mMoveMarker.setRotateAngle((float) getAngle(0)); LatLngBounds.Builder builder = new LatLngBounds.Builder(); builder.include(new LatLng(39.896049, 116.379792)); builder.include(new LatLng(39.936049, 116.419792)); aMap.moveCamera(CameraUpdateFactory.newLatLngBounds(builder.build(), 10)); } /** * 根据点获取图标转的角度 */ private double getAngle(int startIndex) { if ((startIndex + 1) >= mVirtualRoad.getPoints().size()) { throw new RuntimeException("index out of bonds"); } LatLng startPoint = mVirtualRoad.getPoints().get(startIndex); LatLng endPoint = mVirtualRoad.getPoints().get(startIndex + 1); return getAngle(startPoint, endPoint); } /** * 根据两点算取图标转的角度 */ private double getAngle(LatLng fromPoint, LatLng toPoint) { double slope = getSlope(fromPoint, toPoint); if (slope == Double.MAX_VALUE) { if (toPoint.latitude > fromPoint.latitude) { return 0; } else { return 180; } } float deltAngle = 0; if ((toPoint.latitude - fromPoint.latitude) * slope < 0) { deltAngle = 180; } double radio = Math.atan(slope); double angle = 180 * (radio / Math.PI) + deltAngle - 90; return angle; } /** * 根据点和斜率算取截距 */ private double getInterception(double slope, LatLng point) { double interception = point.latitude - slope * point.longitude; return interception; } /** * 算斜率 * 斜率相当于正切值 */ private double getSlope(LatLng fromPoint, LatLng toPoint) { if (toPoint.longitude == fromPoint.longitude) { return Double.MAX_VALUE; } double slope = ((toPoint.latitude - fromPoint.latitude) / (toPoint.longitude - fromPoint.longitude)); return slope; } @Override protected void onResume() { super.onResume(); mMapView.onResume(); } @Override protected void onPause() { super.onPause(); mMapView.onPause(); } @Override protected void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); mMapView.onSaveInstanceState(outState); } @Override protected void onDestroy() { super.onDestroy(); mMapView.onDestroy(); } /** * 计算每次移动的距离 */ private double getMoveDistance(double slope) { if (slope == Double.MAX_VALUE || slope == 0) { return DISTANCE; } return Math.abs((DISTANCE * slope) / Math.sqrt(1 + slope * slope)); } /** * 判断是否为反序 */ private boolean isReverse(LatLng startPoint, LatLng endPoint, double slope) { if (slope == 0) { return startPoint.longitude > endPoint.longitude; } return (startPoint.latitude > endPoint.latitude); } /** * 获取循环初始值大小 */ private double getStart(LatLng startPoint, double slope) { if (slope == 0) { return startPoint.longitude; } return startPoint.latitude; } /** * 获取循环结束大小 */ private double getEnd(LatLng endPoint, double slope) { if (slope == 0) { return endPoint.longitude; } return endPoint.latitude; } public void moveLooper(final LatLng startPoint, final LatLng endPoint) { new Thread() { public void run() { mMoveMarker.setPosition(startPoint); mMoveMarker.setRotateAngle((float) getAngle(startPoint, endPoint)); double slope = getSlope(startPoint, endPoint); boolean isReverse = isReverse(startPoint, endPoint, slope); double moveDistance = isReverse ? getMoveDistance(slope) : -1 * getMoveDistance(slope); double intercept = getInterception(slope, startPoint); for (double j = getStart(startPoint, slope); (j > getEnd(endPoint, slope)) == isReverse; j = j - moveDistance) { LatLng latLng = null; if (slope == 0) { latLng = new LatLng(startPoint.latitude, j); } else if (slope == Double.MAX_VALUE) { latLng = new LatLng(j, startPoint.longitude); } else { latLng = new LatLng(j, (j - intercept) / slope); } mMoveMarker.setPosition(latLng); try { Thread.sleep(TIME_INTERVAL); } catch (InterruptedException e) {