Steema Central

TeeChart Pro v2014, XE3 Builder

I have a strange problem with new VCL version.

Using GDI, default view, 3D turned off

Clear the series, then add a number of series at runtime, setting each color directly.
The first color is defined as clRed. This is also the biggest slice.
This slice displays as black on the pie, though the mark symbol color is correctly set as red. The other slices are the correct colors.
If I turn on 3D, the pie slice turns red. Turn off 3D, the slice turns black.
If I explode the biggest slice, a red slice moves out from underneath the black slice. Apparently this slice is behind a black background.
With 3D turned on, but Views set to 2D, red slice moves behind black background.
If I change the data (in the editor) so another slice is the biggest, this one explodes correctly with the colored slice in front of the black background.
All other slices behave as expected.

Selecting GDI+ seems to fix the problem, but the background is now transparent (or there is no background).

OpenGL is available in the chart editor during design time (but not at runtime). I get an access violation at 0 if I select OpenGL.

How do I programmatically set TextQuality under 3D GDI ?

thanks

K

Hello,

kmanuele wrote:Using GDI, default view, 3D turned off

Clear the series, then add a number of series at runtime, setting each color directly.
The first color is defined as clRed. This is also the biggest slice.
This slice displays as black on the pie, though the mark symbol color is correctly set as red. The other slices are the correct colors.
If I turn on 3D, the pie slice turns red. Turn off 3D, the slice turns black.

I've made a simple example with C++Builder XE7 and TeeChart Pro v2014.12 trying to reproduce this: But the result looks correct to me: Please, try to arrange a simple example project we can run as-is to reproduce the problem here.

Hello,

I've tried the same above with XE3 and TeeChart Pro v2014.12. It also seems to work fine for me here.

kmanuele wrote:If I explode the biggest slice, a red slice moves out from underneath the black slice. Apparently this slice is behind a black background.
With 3D turned on, but Views set to 2D, red slice moves behind black background.
If I change the data (in the editor) so another slice is the biggest, this one explodes correctly with the colored slice in front of the black background.
All other slices behave as expected.

Of course I can't reproduce this second part either.

kmanuele wrote:OpenGL is available in the chart editor during design time (but not at runtime). I get an access violation at 0 if I select OpenGL.

Add the include in the .h: And the pragma link in the .cpp:

kmanuele wrote:How do I programmatically set TextQuality under 3D GDI ?

Here you have a Delphi example where this is being done:
http://www.teechart.net/support/viewtop ... 489#p66489

Thanks for the responses.

I found the source of the problem: make one of your values 0, or a very low number:

Pie1->Clear();

Pie1->Gradient->Visible = false;
Pie1->Marks->Visible = true;
Pie1->AutoMarkPosition = true;
Pie1->Marks->Shadow->Visible = false;
Pie1->Marks->Symbol->Shadow->Visible = false;
Pie1->Circled = true;
Pie1->PieValues->Order = loNone;
Pie1->Marks->Style = smsLabelValue;
Pie1->ValueFormat = "#0.#####";

Chart1->View3D = false;

Chart1->Legend->Visible = false;

Pie1->Add(400.0, "red", clRed);
Pie1->Add(120.32, "green", clGreen);
Pie1->Add(231.89, "blue", clBlue);
Pie1->Add(16.12, "yellow", clYellow);
Pie1->Add(3.20088, "aqua", clAqua);
Pie1->Add(0.31345, "purple", clPurple);
Pie1->Add(0.0001, "black", clBlack);

Hello,

I'm afraid I have to confirm this is the well known and difficult to solve problem with the TPieSeries in some situations.
It's not a trivial problem that would probably need a complete redesign of the series to be fixed.

The only workarounds I can think on at the moment is to switch to GDIPlus or to make the chart 3D: http://bugs.teechart.net/show_bug.cgi?id=935
http://bugs.teechart.net/show_bug.cgi?id=939

Thanks for the confirmation. I did not see this problem with 2012 VCL with same code and pie values.

I have solved the problem by controlling what values are added to the series.

K

re: the Delphi code to set font quality in GDI programmatically, this doesn't seem to work in C++

I like the look of ClearType at smaller fonts

This is what I am trying:

gdic = new TTeeCanvas3D();
gdic->FontQuality = fqClearType;
Chart1->Canvas = gdic;

but FontQuality is declared private, and not accessible

Canvas->Font->Quality is accessible, but has no effect.

Can you help?

thanks for all the support

Kevin

Hello Kevin,

In BCB it's a bit different.
Find attached a simple demo. We'll consider making Canvas->FontQuality public.

Your code works as intended.

Thank you !

Kevin