在 OSMDroid for Android 中旋转标记？

Question

好的，这个问题困扰了我好几个小时，我有以下相对简单的代码，可以在 osmdroid 地图上放置一个标记

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，标记始终面向屏幕顶部（0 度旋转）。我怎样才能轻松地将每个标记旋转到指定的度数（360 度是一个完整的圆）？

Answer 1

尝试像这样使用 RotateMyBitmap 方法：

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 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);
}

结果是：

这很好，但我建议你使用MyLocationOverlay class

Answer 2

如果您不想添加任何自定义代码，您还可以将您的 ItemizedIconOverlay 替换为来自 OSMBonusPack library 的标记（在 osmdroid 之上）。

它支持setRotation(degreees)。

它还支持“平面”或“广告牌”模式，具体取决于您希望在地图也旋转时发生的情况。

Answer 3

这个怎么样：

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

您最好的选择可能是创建 ItemizedItemOverlay 的子类。覆盖 onDrawItem() 并尝试这样的事情：

@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

试试这个：仅当您需要旋转相机时

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));