Huge margins on plots with long rotated axis labels

[Michal Blazejczyk]

Hi,

We are a few versions behind with TeeChart (3.5.3188.18561), but all has been working fine until now... We have a few charts with fairly long bottom axis labels, so we are rotating the text. The problem is that this leaves huge white margins under the chart...

Steema - Huge margin.png (7.45 KiB) Viewed 8768 times

Is there a way to fix this? We would rather not update to a recent version of TeeChart because there are always many backward-compatibility issues, and we simply have no time for that.

Best,
Michal

[Yeray]

Hi Michal,

Yes, I've seen that the bottom margin calculated when having long bottom axis labels with an oblique angle seems to be like the angle were 90.
I've added it to the defect list to be revised in future releases (TF02014926).

[Michal Blazejczyk]

Hi,

Does it mean that it doesn't work well in even recent versions, either? That's sad...

Best,
Michal

[Yeray]

Hi Michal,

What I've seen is that we fixed a similar problem some time ago that may be related (TF02013509) but it's not exactly the same.

[Michal Blazejczyk]

Hi Yeray,

In this case I'm even more surprised because issue TF02013509 you mention is a manifestation of the same problem that I described. It was reported in October 2008, and it is still not fixed???

Could you suggest a workaround, i.e. a way of detecting this situation, and manually making the plot area bigger so that there is no white space under the axis labels?

Best,
Michal

[Narcís]

Hi Michal,

In this case I'm even more surprised because issue TF02013509 you mention is a manifestation of the same problem that I described. It was reported in October 2008, and it is still not fixed???

It seems TF02013509 fixed this for labels at 90 degrees but not for other possible values

Could you suggest a workaround, i.e. a way of detecting this situation, and manually making the plot area bigger so that there is no white space under the axis labels?

What about something as the code below? You can tweak the AfterDraw event a little bit to enhance the workaround.

Code: Select all

		public Form1()
		{
			InitializeComponent();
			InitializeChart();
    }

    private void InitializeChart()
    {
      tChart1.Legend.Visible = false;

      Steema.TeeChart.Styles.Line line1 = new Steema.TeeChart.Styles.Line(tChart1.Chart);

      string label = "this is a very long label for testing";

      line1.Add(3, label);
      line1.Add(5, label);
      line1.Add(7, label);
      line1.Add(2, label);

      tChart1.Axes.Bottom.Labels.Angle = 0;

      tChart1.GetAxisLabel += new Steema.TeeChart.GetAxisLabelEventHandler(tChart1_GetAxisLabel);
      tChart1.AfterDraw += new Steema.TeeChart.PaintChartEventHandler(tChart1_AfterDraw);

      Timer timer1 = new Timer();
      timer1.Interval = 1000;
      timer1.Tick += new EventHandler(timer1_Tick);
      timer1.Enabled = true;
    }

    void tChart1_AfterDraw(object sender, Steema.TeeChart.Drawing.Graphics3D g)
    {
      int angle = tChart1.Axes.Bottom.Labels.Angle;

      if (angle != 0)
      {
        int labelSize = tChart1.Axes.Bottom.MaxLabelsWidth();
        double factor = Math.Sin(angle);
        double margin = labelSize * Math.Abs(factor);

        tChart1.Panel.MarginUnits = Steema.TeeChart.PanelMarginUnits.Pixels;
        tChart1.Panel.MarginBottom = margin;
      }
    }

    void timer1_Tick(object sender, EventArgs e)
    {
      tChart1.Axes.Bottom.Labels.Angle = (tChart1.Axes.Bottom.Labels.Angle + 10 % 360);
    }

    void tChart1_GetAxisLabel(object sender, Steema.TeeChart.GetAxisLabelEventArgs e)
    {
      if (sender.Equals(tChart1.Axes.Bottom))
      {
        if (e.LabelText.Length > 15)
        {
          e.LabelText = string.Format("{0}{1}", e.LabelText.Substring(0, 15), "...");
        }
      }
    }