protected override void onDraw(XnaDrawArgs e)
{
// Determine all of the cells in view
ZRTSModel.Map map = ((XnaUITestGame)Game).Model.GetScenario().GetGameWorld().GetMap();
Point upperLeftCell = new Point(ScrollX / CellDimension, ScrollY / CellDimension);
Point lowerRightCell = new Point(Math.Min((ScrollX + DrawBox.Width) / CellDimension, map.GetWidth() - 1), Math.Min((ScrollY + DrawBox.Height) / CellDimension, map.GetHeight() - 1));
Point offset = new Point(ScrollX % CellDimension, ScrollY % CellDimension);
// Draw all of the tiles
for (int x = upperLeftCell.X; x <= lowerRightCell.X; x++)
{
for (int y = upperLeftCell.Y; y <= lowerRightCell.Y; y++)
{
CellComponent cell = map.GetCellAt(x, y);
Tile tile = cell.GetTile();
DrawTileVisitor drawer = new DrawTileVisitor(e.SpriteBatch, ((XnaUITestGame)Game).SpriteSheet, new Rectangle((x - upperLeftCell.X) * CellDimension - offset.X, (y - upperLeftCell.Y) * CellDimension - offset.Y, CellDimension, CellDimension));
tile.Accept(drawer);
}
}
}
/// <inheritdoc />
public IObservable <Unit> Load(Tile tile)
{
var boundingBox = tile.BoundingBox;
var zoomLevel = ZoomHelper.GetZoomLevel(tile.RenderMode);
var filterElementVisitor = new CompositeElementVisitor(
new NodeVisitor(tile, _modelLoader, _objectPool),
new WayVisitor(tile, _modelLoader, _objectPool),
new RelationVisitor(tile, _modelLoader, _objectPool));
_elevationProvider.SetNullPoint(tile.RelativeNullPoint);
// download elevation data if necessary
if (!_elevationProvider.HasElevation(tile.BoundingBox))
{
_elevationProvider.Download(tile.BoundingBox).Wait();
}
// prepare tile
tile.Accept(tile, _modelLoader);
var subject = new Subject <Unit>();
_elementSourceProvider
.Get(tile.BoundingBox)
.SelectMany(e => e.Get(boundingBox, zoomLevel))
.ObserveOn(Scheduler.ThreadPool)
.SubscribeOn(Scheduler.ThreadPool)
.Subscribe(element => element.Accept(filterElementVisitor),
() =>
{
tile.Canvas.Accept(tile, _modelLoader);
subject.OnCompleted();
});
return(subject);
}