internal Matrix CreateTileLayerTransform(double tileGridScale, Point tileGridTopLeft, Point tileGridOrigin)
{
var scale = ViewportScale / tileGridScale;
var matrix = new Matrix(scale, 0d, 0d, scale, 0d, 0d);
matrix.Rotate(ViewportRotation);
// tile grid origin in map cordinates
//
var mapOrigin = new Point(
tileGridTopLeft.X + tileGridOrigin.X / tileGridScale,
tileGridTopLeft.Y - tileGridOrigin.Y / tileGridScale);
// tile grid origin in viewport cordinates
//
var viewOrigin = ViewportTransform.Transform(mapOrigin);
matrix.Translate(viewOrigin.X, viewOrigin.Y);
return(matrix);
}
/// <summary>
/// Transforms a Location in geographic coordinates to a Point in viewport coordinates.
/// </summary>
public Point LocationToViewportPoint(Location location)
{
return(ViewportTransform.Transform(LocationToPoint(location)));
}