private void OnRender()
{
if (Plotter == null)
{
return;
}
if (DesignerProperties.GetIsInDesignMode(this))
{
return;
}
if (rendering && !renderingPending)
{
Dispatcher.BeginInvoke(OnRender);
return;
}
else if (rendering)
{
return;
}
rendering = true;
renderingPending = false;
ContentPanel.Children.Clear();
var transform = Plotter.Viewport.Transform;
Rect output = Plotter.Viewport.Output;
DataRect visible = Plotter.Viewport.Visible;
var tileInfos = GetVisibleTiles();
var lowerTiles = GetLoadedLowerTiles(tileInfos);
foreach (var tile in lowerTiles)
{
var id = tile.Id;
if (TileSystem.IsLoaded(id))
{
var bmp = TileSystem[id];
DataRect visibleRect = Transform(TileProvider.GetTileBounds(id));
Rect screenRect = visibleRect.DataToScreen(transform);
DrawTile(bmp, screenRect, visibleRect, tile.Clip);
}
else
{
TileSystem.BeginLoadImage(id);
}
}
foreach (var tileInfo in tileInfos)
{
if (TileSystem.IsLoaded(tileInfo.Tile))
{
var bmp = TileSystem[tileInfo.Tile];
DrawTile(bmp, tileInfo.ScreenBounds, tileInfo.VisibleBounds, null);
}
else
{
TileSystem.BeginLoadImage(tileInfo.Tile);
}
}
rendering = false;
}