public HeatPointCollectorMapLayer(MapControl map, IPointLatLngCollector collector)// Stack<PointLatLng> pointstack
{
this.map = map;
this.collector = collector;
palette = HeatMapHelper.GetPalette(paletteImagePath);
Canvas.SetZIndex(image, -100);
Canvas.SetLeft(image, 0);
Canvas.SetTop(image, 0);
image.IsHitTestVisible = false;
map.Children.Add(image);
}
public override void Draw(DrawingContext drawingContext, MapArea viewarea, double zoomRate)
{
int height = viewarea.Area.Height;
int width = viewarea.Area.Width;
if (height == 0 || width == 0)
{
return;
}
if (MapCore.IsDragging)
{
return;
}
positions = collector.ToList().ConvertAll <PointInt>(
new Converter <PointLatLng, PointInt>(ptll => { return(BingMapTileSystem.LatLngToPixelXY(ptll, MapCore.Level)); }));
DrawingVisual visual = new DrawingVisual();
DrawingContext dc = visual.RenderOpen();
for (int i = 0; i < positions.Count; i++)
{
dc.DrawEllipse(HeatMapHelper.CreateBrush((byte)Density, GradientStop), null,
new Point(positions[i].X - viewarea.Area.X, positions[i].Y - viewarea.Area.Y), CircleRadius, CircleRadius);
}
dc.Close();
RenderTargetBitmap rtb = new RenderTargetBitmap(width, height, 96, 96, PixelFormats.Pbgra32);
rtb.Render(visual);
WriteableBitmap bmp = new WriteableBitmap(rtb);
bmp.Lock();
for (int i = 0; i < bmp.PixelHeight; i++)
{
for (int j = 0; j < bmp.PixelWidth; j++)
{
bmp.SetPixelWithoutLock(i, j, palette);
}
}
bmp.AddDirtyRect(new Int32Rect(0, 0, bmp.PixelWidth, bmp.PixelHeight));
bmp.Unlock();
image.Source = bmp;
image.Width = viewarea.Area.Width * zoomRate;
image.Height = viewarea.Area.Height * zoomRate;
base.Draw(drawingContext, viewarea, zoomRate);
}