Bottom and Custom Vertical Axis Label Start Position

[Priyanka]

Hi Christopher,

Actually I am reading minimum and maximum value from database. So I need to pass that value instead of calculating it. Please suggest.

Also, like to know how to increase image (exporting chart to png format) resolution. How to store the chart/image in database?

[Christopher]

Actually I am reading minimum and maximum value from database. So I need to pass that value instead of calculating it. Please suggest.

I'm afraid I don't know what to suggest because I don't know what you are expecting to see. Axis.SetMinMax works as expected, of that there is no doubt. That the values you pass to it do not produce results that you expect is a different matter. What are you expecting to see from the values you pass to Axis.SetMinMax?

Also, like to know how to increase image (exporting chart to png format) resolution.

You can do this with the following:

Code: Select all

        PNGFormat png = tChart1.Chart.Export.Image.PNG;
        png.Height = 2000;
        png.Width = 5000;
        png.Save(@"D:\Trend.png");

How to store the chart/image in database?

I'm not sure how I can help you here, as TeeChart has no code which interacts with databases.

[Priyanka]

Hi Christopher,

In the earlier trend image Y-axis is showing minimum value as 500. Even if I have set it to 0.3 in code. I am expecting Y-axis should be started from 0.3 (min) to 7500 (no issue with max value it is setting correctly). Basically I don't want chart to auto calculate values based on scale.

Is there any feature or property of tee chart to export it into binary format?

[Christopher]

In the earlier trend image Y-axis is showing minimum value as 500. Even if I have set it to 0.3 in code. I am expecting Y-axis should be started from 0.3 (min) to 7500 (no issue with max value it is setting correctly). Basically I don't want chart to auto calculate values based on scale.

One thing is the Axis.Minimum and Axis.Maximum, and another thing are the Axis labels. You can see that SetMinMax works using test code such as the following:

Code: Select all

    private void InitializeChart()
    {
      tChart1.Aspect.View3D = false;
      Line line = new Line(tChart1.Chart);

      Random rnd = new Random();

      for (int i = 0; i < 20; i++)
      {
        line.Add(i, rnd.Next(0, 8000));
      }

      tChart1.Axes.Left.SetMinMax(0.3, 7500);

      tChart1.GetNextAxisLabel += TChart1_GetNextAxisLabel;
    }

    private void TChart1_GetNextAxisLabel(object sender, GetNextAxisLabelEventArgs e)
    {
      if (((Steema.TeeChart.Axis)sender).Equals(tChart1.Axes.Left))
      {
        e.Stop = false;
        switch (e.LabelIndex)
        {
          case 0:
            e.LabelValue = 0.3;
            break;
          case 1:
            e.LabelValue = 500;
            break;
          case 2:
            e.LabelValue = 3000;
            break;
          case 3:
            e.LabelValue = 6000;
            break;
          case 4:
            e.LabelValue = 7500;
            break;
          default:
            e.Stop = true;
            break;
        }
      }
    }

which gives us:

636010835111272411.png (33.97 KiB) Viewed 8367 times

This axis functionality is explained in the tutorials shipped with TeeChart.NET:

tutorials.PNG (48.19 KiB) Viewed 8366 times

Is there any feature or property of tee chart to export it into binary format?

Yes, there are TeeChart's "ten" files explained in Tutorial 12.

[Priyanka]

Hi Christopher,

Thanks. I will take a look at tutorials again.

I would like to know the label value format which supports decimal and negative values. Currently I am using "##0.##;{##0.##}". However, it is showing wrong format in case of negative values. i.e. for value -500 chart is showing {500}. Please suggest.

[Christopher]

I would like to know the label value format which supports decimal and negative values. Currently I am using "##0.##;{##0.##}". However, it is showing wrong format in case of negative values. i.e. for value -500 chart is showing {500}. Please suggest.

You can try: "##0.##;{-##0.##}"

These are standard .NET custom number formatting strings, as you can read here.