NPlot.StepPlot.Draw C# (CSharp) Method

        public virtual void Draw( Graphics g, PhysicalAxis xAxis, PhysicalAxis yAxis )
        {
            SequenceAdapter data =
                new SequenceAdapter( this.DataSource, this.DataMember, this.OrdinateData, this.AbscissaData );

            double leftCutoff = xAxis.PhysicalToWorld(xAxis.PhysicalMin, false);
            double rightCutoff = xAxis.PhysicalToWorld(xAxis.PhysicalMax, false);

            for (int i=0; i<data.Count; ++i)
            {
                PointD p1 = data[i];
                if (Double.IsNaN(p1.X) || Double.IsNaN(p1.Y))
                {
                    continue;
                }

                PointD p2;
                PointD p3;
                if (i+1 != data.Count)
                {
                    p2 = data[i+1];
                    if (Double.IsNaN(p2.X) || Double.IsNaN(p2.Y))
                    {
                        continue;
                    }
                    p2.Y = p1.Y;
                    p3 = data[i+1];
                }
                else
                {
                    p2 = data[i-1];
                    double offset = p1.X - p2.X;
                    p2.X = p1.X + offset;
                    p2.Y = p1.Y;
                    p3 = p2;
                }

                if ( this.center_ )
                {
                    double offset = ( p2.X - p1.X ) / 2.0f;
                    p1.X -= offset;
                    p2.X -= offset;
                    p3.X -= offset;
                }

                PointF xPos1 = xAxis.WorldToPhysical( p1.X, false );
                PointF yPos1 = yAxis.WorldToPhysical( p1.Y, false );
                PointF xPos2 = xAxis.WorldToPhysical( p2.X, false );
                PointF yPos2 = yAxis.WorldToPhysical( p2.Y, false );
                PointF xPos3 = xAxis.WorldToPhysical( p3.X, false );
                PointF yPos3 = yAxis.WorldToPhysical( p3.Y, false );

                // do horizontal clipping here, to speed up
                if ((p1.X < leftCutoff || p1.X > rightCutoff ) &&
                    (p2.X < leftCutoff || p2.X > rightCutoff ) &&
                    (p3.X < leftCutoff || p3.X > rightCutoff ) )
                {
                    continue;
                }

                if (!this.hideHorizontalSegments_)
                {
                    if (scale_ != 1.0f)
                    {
                        float middle = (xPos2.X + xPos1.X) / 2.0f;
                        float width = xPos2.X - xPos1.X;
                        width *= this.scale_;
                        g.DrawLine( Pen, (int)(middle-width/2.0f), yPos1.Y, (int)(middle+width/2.0f), yPos2.Y );
                    }
                    else
                    {
                        g.DrawLine( Pen, xPos1.X, yPos1.Y, xPos2.X, yPos2.Y );
                    }
                }

                if (!this.hideVerticalSegments_)
                {
                    g.DrawLine( Pen, xPos2.X, yPos2.Y, xPos3.X, yPos3.Y );
                }

            }
        }