在OSMDroid for Android中旋轉標記？

Question

好的，這個已經困擾了我幾個小時，我有以下相對簡單的代碼，在osmdroid地圖上放置一個標記

final ArrayList<OverlayItem> items = new ArrayList<OverlayItem>();
OverlayItem marker = new OverlayItem("markerTitle", "markerDescription", new GeoPoint(52.033954,1.210179));
marker.setMarkerHotspot(OverlayItem.HotspotPlace.TOP_CENTER);
items.add(marker);

Drawable newMarker = this.getResources().getDrawable(R.drawable.maincar);
DefaultResourceProxyImpl resProxyImp = new DefaultResourceProxyImpl(getApplicationContext());
ItemizedIconOverlay markersOverlay = new ItemizedIconOverlay<OverlayItem>(items, newMarker, null, resProxyImp);
mapView.getOverlays().add(markersOverlay);

但是，標記始終面向屏幕頂部（0deg reotation）。 如何輕松地將每個標記旋轉到指定的程度（360度是一個完整的圓圈）？

Answer 1

嘗試使用RotateMyBitmap方法，如下所示：

Bitmap source = BitmapFactory.decodeResource(this.getResources(), R.drawable.ic_launcher);

Bitmap target = RotateMyBitmap(source, 120.0f);

final ArrayList<OverlayItem> items = new ArrayList<OverlayItem>();
OverlayItem marker = new OverlayItem("markerTitle", "markerDescription", new GeoPoint(52.033954,1.210179));
marker.setMarkerHotspot(OverlayItem.HotspotPlace.TOP_CENTER);
items.add(marker);

Drawable newMarker = new BitmapDrawable(getResources(), target);

//Drawable newMarker = this.getResources().getDrawable(R.drawable.maincar);
DefaultResourceProxyImpl resProxyImp = new DefaultResourceProxyImpl(getApplicationContext());
ItemizedIconOverlay markersOverlay = new ItemizedIconOverlay<OverlayItem>(items, newMarker, null, resProxyImp);
mapView.getOverlays().add(markersOverlay);

RotateMyBitmap的位置是：

public static Bitmap RotateMyBitmap(Bitmap source, float angle)
{
    Matrix matrix = new Matrix();
    matrix.postRotate(angle);
    return Bitmap.createBitmap(source, 0, 0, source.getWidth(), source.getHeight(), matrix, true);
}

結果是：

這工作正常，但我建議你使用MyLocationOverlay類

Answer 2

如果您不想添加任何自定義代碼，還可以通過OSMBonusPack庫中的Marker（在osmdroid之上）替換ItemizedIconOverlay 。

它支持setRotation(degreees) 。

它還支持“平面”或“廣告牌”模式，具體取決於地圖也旋轉時您想要發生的事情。

Answer 3

這個怎么樣：

Bitmap bmpOriginal = BitmapFactory.decodeResource(this.getResources(), R.drawable.maincar_osm);
Bitmap bmResult = Bitmap.createBitmap(bmpOriginal.getWidth()*2, bmpOriginal.getHeight()*2, Bitmap.Config.ARGB_8888);
Canvas tempCanvas = new Canvas(bmResult);
tempCanvas.rotate(270, bmpOriginal.getWidth()/2, bmpOriginal.getHeight()/2);
tempCanvas.drawBitmap(bmpOriginal, 0, 0, null);
Drawable newMarker = new BitmapDrawable(getResources(),bmResult);
DefaultResourceProxyImpl resProxyImp = new DefaultResourceProxyImpl(getApplicationContext());
ItemizedIconOverlay markersOverlay = new ItemizedIconOverlay<OverlayItem>(items, newMarker, null, resProxyImp);
mapView.getOverlays().add(markersOverlay);

Answer 4

您最好的選擇可能是創建ItemizedItemOverlay的子類。 覆蓋onDrawItem（）並嘗試這樣的事情：

@Override
protected void onDrawItem(ISafeCanvas canvas, Item item, Point curScreenCoords, float aMapOrientation) {

    int degrees = 90;
    canvas.save();
    canvas.rotate(degrees, curScreenCoords.x, curScreenCoords.y);
    super.onDrawItem(canvas, item, curScreenCoords, aMapOrientation);
    canvas.restore();
}

Answer 5

試試這個：只有你需要旋轉相機

CameraPosition cameraPosition = new CameraPosition.Builder()
                .target(centerCoordinates)      // Sets the center of the map
                .zoom(zoom)                   // Sets the zoom
                .bearing(bearing)             // Sets the orientation of the camera to east
                .tilt(30)                   // Sets the tilt of the camera to 30 degrees
                .build();                   // Creates a CameraPosition from the builder

googleMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));