/// <summary>
/// Sets ViewportScale and ViewportTransform values.
/// </summary>
public virtual void SetViewportTransform(Location projectionCenter, Location mapCenter, Point viewportCenter, double zoomLevel, double heading)
{
ViewportScale = GetViewportScale(zoomLevel);
ViewportTransform.Matrix = MatrixEx.TranslateScaleRotateTranslate(
LocationToPoint(mapCenter), ViewportScale, -ViewportScale, heading, viewportCenter);
}
private void SetRenderTransform()
{
var tileScale = (1 << TileGrid.ZoomLevel);
var scale = Math.Pow(2d, parentMap.ZoomLevel) / tileScale;
var tileCenter = GetTileCenter(tileScale);
var tileOrigin = new Point(TileSource.TileSize * (tileCenter.X - TileGrid.XMin), TileSource.TileSize * (tileCenter.Y - TileGrid.YMin));
var viewCenter = new Point(parentMap.RenderSize.Width / 2d, parentMap.RenderSize.Height / 2d);
((MatrixTransform)RenderTransform).Matrix =
MatrixEx.TranslateScaleRotateTranslate(tileOrigin, scale, parentMap.Heading, viewCenter);
}
private void SetRenderTransform()
{
var tileScale = (double)(1 << TileGrid.ZoomLevel);
var scale = Math.Pow(2d, parentMap.ZoomLevel) / tileScale;
var tileCenterX = tileScale * (0.5 + parentMap.Center.Longitude / 360d);
var tileCenterY = tileScale * (0.5 - WebMercatorProjection.LatitudeToY(parentMap.Center.Latitude) / 360d);
var tileOriginX = MapProjection.TileSize * (tileCenterX - TileGrid.XMin);
var tileOriginY = MapProjection.TileSize * (tileCenterY - TileGrid.YMin);
var viewCenterX = parentMap.RenderSize.Width / 2d;
var viewCenterY = parentMap.RenderSize.Height / 2d;
((MatrixTransform)RenderTransform).Matrix = MatrixEx.TranslateScaleRotateTranslate(
-tileOriginX, -tileOriginY, scale, scale, parentMap.Heading, viewCenterX, viewCenterY);
}
private TileGrid GetTileGrid()
{
var tileZoomLevel = Math.Max(0, (int)Math.Round(parentMap.ZoomLevel + ZoomLevelOffset));
var tileScale = (1 << tileZoomLevel);
var scale = tileScale / (Math.Pow(2d, parentMap.ZoomLevel) * TileSource.TileSize);
var tileCenter = GetTileCenter(tileScale);
var viewCenter = new Point(parentMap.RenderSize.Width / 2d, parentMap.RenderSize.Height / 2d);
var transform = new MatrixTransform
{
Matrix = MatrixEx.TranslateScaleRotateTranslate(viewCenter, scale, -parentMap.Heading, tileCenter)
};
var bounds = transform.TransformBounds(new Rect(0d, 0d, parentMap.RenderSize.Width, parentMap.RenderSize.Height));
return(new TileGrid(tileZoomLevel,
(int)Math.Floor(bounds.X), (int)Math.Floor(bounds.Y),
(int)Math.Floor(bounds.X + bounds.Width), (int)Math.Floor(bounds.Y + bounds.Height)));
}
private TileGrid GetTileGrid()
{
var tileZoomLevel = Math.Max(0, (int)Math.Round(parentMap.ZoomLevel + ZoomLevelOffset));
var tileScale = (double)(1 << tileZoomLevel);
var scale = tileScale / (Math.Pow(2d, parentMap.ZoomLevel) * MapProjection.TileSize);
var tileCenterX = tileScale * (0.5 + parentMap.Center.Longitude / 360d);
var tileCenterY = tileScale * (0.5 - WebMercatorProjection.LatitudeToY(parentMap.Center.Latitude) / 360d);
var viewCenterX = parentMap.RenderSize.Width / 2d;
var viewCenterY = parentMap.RenderSize.Height / 2d;
var transform = new MatrixTransform
{
Matrix = MatrixEx.TranslateScaleRotateTranslate(-viewCenterX, -viewCenterY, scale, scale, -parentMap.Heading, tileCenterX, tileCenterY)
};
var bounds = transform.TransformBounds(new Rect(0d, 0d, parentMap.RenderSize.Width, parentMap.RenderSize.Height));
return(new TileGrid(tileZoomLevel,
(int)Math.Floor(bounds.X), (int)Math.Floor(bounds.Y),
(int)Math.Floor(bounds.X + bounds.Width), (int)Math.Floor(bounds.Y + bounds.Height)));
}