Making both vertical axis visible at all times in TeeChart

[dummzeuch 1524]

I am using TeeChart for drawing multiple series with two different vertical axis. One set of series uses the left axis, the others use the right axis. The legend contains check boxes that allow the user to turn a series on and off.

 

Everything works fine but there is one small problem that I can't get solved: When all series associated with one of the axis are turned off, this axis is not shown.

Right Axis missing:

 

 

Left axis missing:

 

 

I don't want that. Both axes should always be shown, regardless of which series are visible. But I found no way to change this behavior. Any hint?

Edited 10 hours ago by dummzeuch

[Sherlock 666]

Perhaps draw invisible point belonging to the axis?

[dummzeuch 1524]

1 hour ago, Sherlock said:

Perhaps draw invisible point belonging to the axis?

Invisible point? You mean a point series, that is visible but does no contain any data? Or one that contains data but is set to be drawn invisibly?

I thought about that, but I was really hoping that I am just missing some setting.

Edited 8 hours ago by dummzeuch

[Sherlock 666]

Visible but without data, best describes what I meant. I currently don't use TChart but had to, several years ago. I remember the necessity for trickery like that to reach the expected outcome. But my brain is not good at storing code...sorry.

[Die Holländer 50]

Is it possible to use the Afterdraw event to force the axis to be visible?

 

procedure TForm1.Chart1AfterDraw(Sender: TObject);
begin
  if not Chart1.Axes.Left.Visible then
    Chart1.Axes.Left.Visible := True;
  if not Chart1.Axes.Right.Visible then
    Chart1.Axes.Right.Visible := True;
end;

 

[dummzeuch 1524]

1 hour ago, Die Holländer said:

Is it possible to use the Afterdraw event to force the axis to be visible?

procedure TForm1.Chart1AfterDraw(Sender: TObject);
begin
  if not Chart1.Axes.Left.Visible then
    Chart1.Axes.Left.Visible := True;
  if not Chart1.Axes.Right.Visible then
    Chart1.Axes.Right.Visible := True;
end;

 

Interesting idea, but unfortunately it doesn't work either. I also tried to just set them visible unconditionally and tried the BeforeDrawAxes event.

[dummzeuch 1524]

Adding two empty point series, one associated with each axis, and not shown in the legend, does the trick.

 

This still feels too much like a hack. So if anybody else has an idea... ?

 

I used to have an account for Steema's support forum, but my credentials don't seem to work any more.

Edited 6 hours ago by dummzeuch

[Pat Foley 52]

I found this 

Quote

Pep wrote:Hi Bertrod,

you can accomplish that by using :
Series1.Pen.Visible:=false;

This one works well. Thank you pep.

at http://teechart.net/support/viewtopic.php?t=4313

 

 

[dummzeuch 1524]

2 hours ago, Pat Foley said:

I found this 

at http://teechart.net/support/viewtopic.php?t=4313

Unfortunately this is basically the same hack as with empty TPointSeries, just made invisible with a different method.