private void DrawGraph(SKCanvas Canvas, SKPoint[] Points, object[] Parameters, SKPoint[] PrevPoints, object[] PrevParameters, DrawingArea DrawingArea) { SKPaint Brush = null; SKPath Path = null; try { Brush = new SKPaint() { Style = SKPaintStyle.Fill, Color = Graph.ToColor(Parameters[0]) }; Path = new SKPath(); Path = Plot2DCurve.CreateSpline(Points); if (PrevPoints is null) { IElement Zero; ISet Set = DrawingArea.MinY.AssociatedSet; if (Set is IGroup Group) { Zero = Group.AdditiveIdentity; } else { Zero = new DoubleNumber(0); } IVector XAxis = VectorDefinition.Encapsulate(new IElement[] { DrawingArea.MinX, DrawingArea.MaxX }, false, this) as IVector; IVector YAxis = VectorDefinition.Encapsulate(new IElement[] { Zero, Zero }, false, this) as IVector; PrevPoints = DrawingArea.Scale(XAxis, YAxis); if (DrawingArea.MinX is StringValue && DrawingArea.MaxX is StringValue) { PrevPoints[0].X = Points[0].X; PrevPoints[1].X = Points[Points.Length - 1].X; } } PrevPoints = (SKPoint[])PrevPoints.Clone(); Array.Reverse(PrevPoints); Plot2DCurve.CreateSpline(Path, PrevPoints); Path.LineTo(Points[0]); Canvas.DrawPath(Path, Brush); } finally { if (Brush != null) { Brush.Dispose(); } if (Path != null) { Path.Dispose(); } } }