Steema Central

Posted: **Thu Jun 30, 2011 10:52 am**

Hi all,

I am facing a problem while managing axes programmatically. Axes in my chart are logarithmic. I have some series on my chart. I can move these series over the chart by just clicking and dragging over the chart with mouse. My problem is when I move any series out of the boundaries it became invisible as it crosses the boundaries of the chart. To prevent this I started managing the axes on each and every move of series. But, as it is logarithmic axes, I am facing some problem. Hope you can understand what I am trying to do. One thing I want to let you know that I‘ve already done it for Linear Axes.

For more explanation I am attaching a project which contain a example which is created to do above task. It has two forms, LogAxis.cs and LinAxis.cs. In LogAxis.cs I tried to implement above task in logarithmic axes while in LinAxis.cs I tried to implement above in linear axes.
(There may be problem while running the project, since this project was too large, I have removed TeeChart DLL(version 4.1.2011) from bin folder. Please paste this dll at bin folder to run it.)

Hope you can understand what I am looking for.

Thanks in advance for solving this query.

Thanks and Regards
Ashish Pandey

Posted: **Fri Jul 01, 2011 11:03 am**

Hi Ashish,

If I understand your problem correctly it occurs when moving a point towards the minimum of the logarithmic axis, is that correct? If that's the case, I have observed that the problem occurs when point values are less than 1. You can check that adding the line below to tChart1_MouseMove.

Code: Select all

            tChart1.Header.Text = m_pCurrent.ToString();

Given that Log(1) = 0, logarithmic axes can not plot values smaller than one and hence your values disappearing. That being the case you should restrict that movement, for example, implementing tChart1_MouseMove like this:

Code: Select all

        private void tChart1_MouseMove(object sender, MouseEventArgs e)
        {
          double tmpX = tChart1.Axes.Bottom.CalcPosPoint(e.X);
          double tmpY = tChart1.Axes.Left.CalcPosPoint(e.Y);

          m_pCurrent.X = (tmpX < 1) ? 1 : (float)tmpX;
          m_pCurrent.Y = (tmpY < 1) ? 1 : (float)tmpY;
          
          tChart1.Header.Text = m_pCurrent.ToString();

          if (isMouseDownOnChart)
          {
            if (isMouseDownOnPoint1)
            {
              pointSeries1[0].X = m_pCurrent.X;
              pointSeries1[0].Y = m_pCurrent.Y;
            }

            if (isMouseDownOnPoint2)
            {
              pointSeries2[0].X = m_pCurrent.X;
              pointSeries2[0].Y = m_pCurrent.Y;
            }

            if (isMouseDownOnLine1)
            {
              line1[indexOfClickedPoint].X = m_pCurrent.X;
              line1[indexOfClickedPoint].Y = m_pCurrent.Y;
            }
          }
        }

Can you please confirm that's the problem you are experiencing?

Thanks in advance.

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