private bool SetTileMatrix()
{
var tileMatrixZoomLevel = (int)Math.Floor(ParentMap.ZoomLevel + 0.001); // avoid rounding issues
var tileMatrixScale = ViewTransform.ZoomLevelToScale(tileMatrixZoomLevel);
// bounds in tile pixels from view size
//
var bounds = ParentMap.ViewTransform.GetTileMatrixBounds(tileMatrixScale, MapTopLeft, ParentMap.RenderSize);
// tile column and row index bounds
//
var xMin = (int)Math.Floor(bounds.X / TileSize);
var yMin = (int)Math.Floor(bounds.Y / TileSize);
var xMax = (int)Math.Floor((bounds.X + bounds.Width) / TileSize);
var yMax = (int)Math.Floor((bounds.Y + bounds.Height) / TileSize);
if (TileMatrix != null &&
TileMatrix.ZoomLevel == tileMatrixZoomLevel &&
TileMatrix.XMin == xMin && TileMatrix.YMin == yMin &&
TileMatrix.XMax == xMax && TileMatrix.YMax == yMax)
{
return(false);
}
TileMatrix = new TileMatrix(tileMatrixZoomLevel, xMin, yMin, xMax, yMax);
return(true);
}
protected override void SetRenderTransform()
{
// tile matrix origin in pixels
//
var tileMatrixOrigin = new Point(TileSize * TileMatrix.XMin, TileSize * TileMatrix.YMin);
var tileMatrixScale = ViewTransform.ZoomLevelToScale(TileMatrix.ZoomLevel);
((MatrixTransform)RenderTransform).Matrix =
ParentMap.ViewTransform.GetTileLayerTransform(tileMatrixScale, MapTopLeft, tileMatrixOrigin);
}