/// <inheritdoc/>
/// see https://github.com/oxyplot/oxyplot/blob/develop/Source/OxyPlot/Series/ScatterSeries%7BT%7D.cs#L322-L460
public override void Render(IRenderContext rc)
{
var actualPoints = ActualPointsList;
if (actualPoints == null || actualPoints.Count == 0)
{
return;
}
var clippingRect = GetClippingRect();
var n = actualPoints.Count;
var allPoints = new List <ScreenPoint>(n);
var allMarkerSizes = new List <double>(n);
var groupPoints = new Dictionary <int, IList <ScreenPoint> >();
var groupSizes = new Dictionary <int, IList <double> >();
// Transform all points to screen coordinates
for (var i = 0; i < n; i++)
{
var dp = new DataPoint(actualPoints[i].X, actualPoints[i].Y);
// Skip invalid points
if (!IsValidPoint(dp))
{
continue;
}
var size = double.NaN;
var value = double.NaN;
var scatterPoint = actualPoints[i];
if (scatterPoint != null)
{
size = scatterPoint.Size;
value = scatterPoint.Value;
}
if (double.IsNaN(size))
{
size = MarkerSize;
}
// Transform from data to screen coordinates
var screenPoint = this.Transform(dp.X, dp.Y);
if (ColorAxis != null)
{
if (double.IsNaN(value))
{
continue;
}
var group = ColorAxis.GetPaletteIndex(value);
if (!groupPoints.ContainsKey(group))
{
groupPoints.Add(group, new List <ScreenPoint>());
groupSizes.Add(group, new List <double>());
}
groupPoints[group].Add(screenPoint);
groupSizes[group].Add(size);
}
else
{
allPoints.Add(screenPoint);
allMarkerSizes.Add(size);
}
}
// Offset of the bins
var binOffset = this.Transform(MinX, MaxY);
if (ColorAxis != null)
{
// Draw the grouped (by color defined in ColorAxis) markers
var markerIsStrokedOnly = MarkerType == MarkerType.Plus || MarkerType == MarkerType.Star || MarkerType == MarkerType.Cross;
foreach (var(key, value) in groupPoints)
{
var color = ColorAxis.GetColor(key);
rc.DrawMarkers(
value,
MarkerType,
MarkerOutline,
groupSizes[key],
OxyColor.FromAColor(Opacity, MarkerFill.GetActualColor(color)),
markerIsStrokedOnly ? color : MarkerStroke,
MarkerStrokeThickness,
EdgeRenderingMode,
BinSize,
binOffset);
}
}
rc.DrawMarkers(
allPoints,
MarkerType,
MarkerOutline,
allMarkerSizes,
OxyColor.FromAColor(Opacity, ActualMarkerFillColor),
MarkerStroke,
MarkerStrokeThickness,
EdgeRenderingMode,
BinSize,
binOffset);
if (LabelFormatString != null)
{
RenderPointLabels(rc, clippingRect);
}
}