圍繞任意點旋轉osmdroid地圖

Question

我需要圍繞當前位置標記旋轉我的地圖。當前位置標記將被放置在地圖的引導處。就像一張照片。 Map with location marker

Answer 1

我解決了我的任務，此代碼：

//rotate map 
map.setMapOrientation(angle); 

//center to current location 
GeoPoint point = mMyLocationNewOverlay.getMyLocation(); 
if (point == null) return; 
mapController.setCenter(point); 

//calculate translation 
float bottomPadding = map.getHeight() * 0.1f; 
float radius = map.getHeight()/2 - bottomPadding; 
double deltaW = Math.sin(Math.toRadians(angle)); 
double deltaH = Math.cos(Math.toRadians(angle)); 

int width = map.getWidth()/2 - (int)(radius * deltaW); 
int height = map.getHeight()/2 - (int)(radius * deltaH); 

//Move current location marker to bottom of the map 
Projection projection = map.getProjection(); 
GeoPoint centerPoint = (GeoPoint) projection.fromPixels(width, height); 
mapController.setCenter(centerPoint);