internal Rect GetTileBounds(double tileGridScale, Point tileGridTopLeft, Size viewportSize)
{
var scale = tileGridScale / ViewportScale;
var matrix = new Matrix(scale, 0d, 0d, scale, 0d, 0d);
matrix.Rotate(-ViewportRotation);
// viewport origin in map coordinates
//
var origin = InverseViewportTransform.Transform(new Point());
// translate origin to tile grid origin in pixels
//
matrix.Translate(
tileGridScale * (origin.X - tileGridTopLeft.X),
tileGridScale * (tileGridTopLeft.Y - origin.Y));
// transforms viewport bounds to tile pixel bounds
//
var transform = new MatrixTransform {
Matrix = matrix
};
return(transform.TransformBounds(new Rect(0d, 0d, viewportSize.Width, viewportSize.Height)));
}
/// <summary>
/// Transforms a Rect in viewport coordinates to a BoundingBox in geographic coordinates.
/// </summary>
public BoundingBox ViewportRectToBoundingBox(Rect rect)
{
var p1 = InverseViewportTransform.Transform(new Point(rect.X, rect.Y));
var p2 = InverseViewportTransform.Transform(new Point(rect.X, rect.Y + rect.Height));
var p3 = InverseViewportTransform.Transform(new Point(rect.X + rect.Width, rect.Y));
var p4 = InverseViewportTransform.Transform(new Point(rect.X + rect.Width, rect.Y + rect.Height));
rect.X = Math.Min(p1.X, Math.Min(p2.X, Math.Min(p3.X, p4.X)));
rect.Y = Math.Min(p1.Y, Math.Min(p2.Y, Math.Min(p3.Y, p4.Y)));
rect.Width = Math.Max(p1.X, Math.Max(p2.X, Math.Max(p3.X, p4.X))) - rect.X;
rect.Height = Math.Max(p1.Y, Math.Max(p2.Y, Math.Max(p3.Y, p4.Y))) - rect.Y;
return(RectToBoundingBox(rect));
}
/// <summary>
/// Transforms a Point in viewport coordinates to a Location in geographic coordinates.
/// </summary>
public Location ViewportPointToLocation(Point point)
{
return(PointToLocation(InverseViewportTransform.Transform(point)));
}
