private Point FromLatLngToPoint(LatLng latLng)
{
double x = this.pixelOrigin.X + latLng.Lng * this.pixelsPerLngDegree;
// NOTE(appleton): Truncating to 0.9999 effectively limits latitude to
// 89.189. This is about a third of a tile past the edge of the world tile.
var sinY = this.Bound(Math.Sin(this.DegreesToRadians(latLng.Lat)), -0.9999, 0.9999);
double y = this.pixelOrigin.Y + 0.5 * Math.Log((1 + sinY) / (1 - sinY)) * -this.pixelsPerLngRadian;
return new Point(x, y);
}
public Bounds GetCorners(LatLng center, int zoom, int width, int height)
{
var scale = Math.Pow(2, zoom);
var centerPoint = this.FromLatLngToPoint(center);
var southWestPoint = new Point(centerPoint.X - (width / 2) / scale, centerPoint.Y + (height / 2) / scale);
var southWestLatLng = this.FromPointToLatLng(southWestPoint);
var northEastPoint = new Point(centerPoint.X + (width / 2) / scale, centerPoint.Y - (height / 2) / scale);
var northEastLatLng = this.FromPointToLatLng(northEastPoint);
return new Bounds
{
NorthEast = northEastLatLng,
SouthWest = southWestLatLng
};
}
