Steema Central

Posted: **Wed Mar 15, 2006 10:52 am**

I have a line series formulated using the below code:

line1.Add(1,1);
line1.Add(5,5);
line1.Add(10,1);
line1.Add(15,5);
line1.Add(20,1);
line1.Add(25,5);

This forms a triangular wave curve.

I need to know if there is any way to fill the triangular area formed by this series?

Thanks!

Posted: **Wed Mar 15, 2006 2:51 pm**

Hi Lakshmi,

You have 2 options to achieve that:

1. Using Area series which already does that.

2. Custom drawing on TeeChart's canvas doing something like this:

Code: Select all

    private void Form1_Load(object sender, EventArgs e)
    {
      line1.Add(1, 1);
      line1.Add(5, 5);
      line1.Add(10, 1);
      line1.Add(15, 5);
      line1.Add(20, 1);
      line1.Add(25, 5); 

    }

    private void tChart1_AfterDraw(object sender, Steema.TeeChart.Drawing.Graphics3D g)
    {
      g.Brush.Color = line1.Color;
      g.Brush.Solid = true;
      g.Brush.Visible = true;
      g.Brush.Transparency = 50;

      int i;
      
      for (i = 0; i+2 < line1.Count; i=i+2)
      {
        Steema.TeeChart.Drawing.Triangle3D Triangle = new Steema.TeeChart.Drawing.Triangle3D();

        Triangle.p0.X = line1.CalcXPos(i);
        Triangle.p0.Y = line1.CalcYPos(i);
        Triangle.p1.X = line1.CalcXPos(i+1);
        Triangle.p1.Y = line1.CalcYPos(i+1);
        Triangle.p2.X = line1.CalcXPos(i+2);
        Triangle.p2.Y = line1.CalcYPos(i+2);

        g.Triangle(Triangle);
      }

      if (i<line1.Count)
      {
        Steema.TeeChart.Drawing.Triangle3D Triangle = new Steema.TeeChart.Drawing.Triangle3D();

        Triangle.p0.X = line1.CalcXPos(i);
        Triangle.p0.Y = line1.CalcYPos(i);
        Triangle.p1.X = line1.CalcXPos(i + 1);
        Triangle.p1.Y = line1.CalcYPos(i + 1);
        Triangle.p2.X = line1.CalcXPos(i + 1);
        Triangle.p2.Y = line1.CalcYPos(i);

        g.Triangle(Triangle);        
      }
    }

Posted: **Thu Mar 16, 2006 5:30 am**

Hi Narcis,

If I use the area series, then that would fill the area starting from origin, but I wish to fill the area only between the traingles. How do I achieve that using area series?

Thanks

Posted: **Thu Mar 16, 2006 11:47 am**

Hi Lakshmi,

You can set an origin for Area series as shown in the All Features\Welcome !\Chart styles\Standard\Area\Setting origin example at TeeChart's features demo.

Steema Central

Fill the area between the points on the line series

Fill the area between the points on the line series

Fill the area between the points on the line series