public GraphicsEngine.ArgbColor GetPixel(IRasterPaintContext context, double X, double Y)
{
//return Color.Beige;
if (context?.Bitmap == null)
{
return(GraphicsEngine.ArgbColor.Transparent);
}
int x, y;
_tfw.World2Image(X, Y, out x, out y);
if (x < 0 || y < 0 || x >= _iWidth || y >= _iHeight)
{
return(GraphicsEngine.ArgbColor.Transparent);
}
return(context.Bitmap.GetPixel(x, y));
}
async override protected Task DrawRasterParentLayer(IParentRasterLayer rLayer, ICancelTracker cancelTracker, IRasterLayer rootLayer)
{
IRasterPaintContext paintContext = null;
try
{
if (rLayer is ILayer && ((ILayer)rLayer).Class is IRasterClass)
{
paintContext = await((IRasterClass)((ILayer)rLayer).Class).BeginPaint(this.Display, cancelTracker);
}
else if (rLayer is IRasterClass)
{
paintContext = await((IRasterClass)rLayer).BeginPaint(this.Display, cancelTracker);
}
string filterClause = String.Empty;
if (rootLayer is IRasterCatalogLayer)
{
filterClause = ((((IRasterCatalogLayer)rootLayer).FilterQuery != null) ?
((IRasterCatalogLayer)rootLayer).FilterQuery.WhereClause : String.Empty);
}
using (IRasterLayerCursor cursor = await rLayer.ChildLayers(this, filterClause))
{
ILayer child;
while ((child = await cursor.NextRasterLayer()) != null)
//foreach (ILayer child in ((IParentRasterLayer)rLayer).ChildLayers(this, filterClause))
{
if (!cancelTracker.Continue)
{
break;
}
if (child.Class is IParentRasterLayer)
{
await DrawRasterParentLayer((IParentRasterLayer)child.Class, cancelTracker, rootLayer);
continue;
}
if (!(child is IRasterLayer))
{
continue;
}
IRasterLayer cLayer = (IRasterLayer)child;
RenderRasterLayer rlt = new RenderRasterLayer(this, cLayer, rootLayer, cancelTracker);
await rlt.Render();
if (child.Class is IDisposable)
{
((IDisposable)child.Class).Dispose();
}
}
}
}
finally
{
if (paintContext != null)
{
paintContext.Dispose();
}
}
}
