using System;
using System.Drawing;
using PowerLanguage.Function;
using System.Drawing.Drawing2D;

namespace PowerLanguage.Indicator
{
  public class NewTest_CustomDraw : IndicatorObject, IChartCustomDrawer
  {
    public NewTest_CustomDraw( object _ctx ) : base(_ctx)
    {
    }

    protected override void Create()
    {
      ChartCustomDraw.Register( this );
    }

    protected override void StartCalc()
    {                                                         
    }

    protected override void CalcBar()
    {
      ChartCustomDraw.ReDraw();
    }

    protected override void Destroy()
    {
      ChartCustomDraw.Unregister( this );
    }
    
    void IChartCustomDrawer.Draw( DrawContext context, EDrawPhases phase )
    {
        if (Bars.LastBarOnChart)
        {
            if (phase == EDrawPhases.BeforeFGShapes && context.DrawRect == context.FullRect)
            {
                Diamond g = new Diamond();

                PointF one = context.Environment.ChartPoint2Point(new ChartPoint { Price = Bars.Low[0], Time = Bars.Time[0] });
                PointF two = context.Environment.ChartPoint2Point(new ChartPoint { Price = Bars.High[10], Time = Bars.Time[10] });
                PointF three = context.Environment.ChartPoint2Point(new ChartPoint { Price = Bars.Low[27], Time = Bars.Time[27] });
                PointF four = context.Environment.ChartPoint2Point(new ChartPoint { Price = Bars.High[49], Time = Bars.Time[49] });

                g.RenderPoly(context.graphics, one, two, three, four);
            }
        }
    }
  }

  public class Diamond
  {
    public Diamond()
    {
    }

    public void RenderPoly(Graphics g, PointF x, PointF a, PointF b, PointF c)
    {
        PointF[] setPoints = new PointF[] {x, a, b, c};
		g.FillPolygon(Brushes.AliceBlue, setPoints);
    }
  }
}