/// <summary>
/// Draws the graph on a canvas.
/// </summary>
/// <param name="Canvas">Canvas to draw on.</param>
/// <param name="Points">Points to draw.</param>
/// <param name="Parameters">Graph-specific parameters.</param>
/// <param name="PrevPoints">Points of previous graph of same type (if available), null (if not available).</param>
/// <param name="PrevParameters">Parameters of previous graph of same type (if available), null (if not available).</param>
/// <param name="DrawingArea">Current drawing area.</param>
public 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 = Plot2DCurvePainter.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, null) as IVector;
IVector YAxis = VectorDefinition.Encapsulate(new IElement[] { Zero, Zero }, false, null) 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);
Plot2DCurvePainter.CreateSpline(Path, PrevPoints);
Path.LineTo(Points[0]);
Canvas.DrawPath(Path, Brush);
}
finally
{
Brush?.Dispose();
Path?.Dispose();
}
}
private void DrawGraph(SKCanvas Canvas, SKPoint[] Points, object[] Parameters, SKPoint[] PrevPoints, object[] PrevParameters,
DrawingArea DrawingArea)
{
SKPaint Brush = null;
SKPath Path = null;
bool First = true;
try
{
Brush = new SKPaint()
{
Style = SKPaintStyle.Fill,
Color = Graph.ToColor(Parameters[0])
};
Path = new SKPath();
foreach (SKPoint Point in Points)
{
if (First)
{
First = false;
Path.MoveTo(Point);
}
else
{
Path.LineTo(Point);
}
}
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;
}
}
int i = PrevPoints.Length;
while (--i >= 0)
{
Path.LineTo(PrevPoints[i]);
}
Path.LineTo(Points[0]);
Canvas.DrawPath(Path, Brush);
}
finally
{
if (Brush != null)
{
Brush.Dispose();
}
if (Path != null)
{
Path.Dispose();
}
}
}