Bug 2460

I've tested the following code in both RAD 10.4 + TeeChart 2021.32 and RAD 11 + TeeChart 2021.33, and I've got no gradient in any of them.

uses VCLTee.Chart, VCLTee.TeeSurfa, VCLTee.TeeConst, VCLTee.TeeGDIPlus;

var Chart1: TChart;

procedure TForm1.FormCreate(Sender: TObject);
begin
  Caption:=TeeMsg_Version;

  Chart1:=TChart.Create(Self);
  Chart1.Parent:=Self;
  Chart1.Align:=alClient;

  Chart1.View3D:=False;
  Chart1.Legend.Hide;

  Chart1.Axes.Bottom.SetMinMax(0, 11);
  Chart1.Axes.Left.SetMinMax(0, 11);

  with TContourSeries(Chart1.AddSeries(TContourSeries)) do
  begin
    FillSampleValues;
    Filled:=True;
  end;
end;

However, adding this to the code, makes the gradients to appear in both environments:

  Chart1.Gradient.Visible:=True;
  Chart1.Gradient.EndColor:=clGray;

  Chart1.Walls.Back.Transparent:=False;
  Chart1.Walls.Back.Gradient.Visible:=True;
  Chart1.Walls.Back.Gradient.StartColor:=clGray;
  Chart1.Walls.Back.Gradient.EndColor:=clWhite;

I'll close this as "invalid" for the moment.
If you still find problems with it, please arrange a simple example project we can run as-is to reproduce the problem here.

Here is a C++ project the exhibits the issue.  Just double click on the chart to load the data file for the chart.  The ChartData.sfp should is in the debug folder.

Created attachment 981 [details]
Sample project the exhibits the behavior.

Double click on the chart to load the chart data.

Created attachment 982 [details]
Removed some libs that are not needed from the project.

We're looking at this. The minimum palette colour is black in this example, that is rendering in the latest version of the code, didn't in previous version (to be revised).

Try this workaround code:

uses System.UITypes;

    with TContourSeries(Chart1[0]) do
    begin
      Levels.Items[0].Color := TAlphaColor($FFFFFFFF); //transparent
    end;

The work around setting the first color to transparent works.

uses System.UITypes;

    with TContourSeries(Chart1[0]) do
    begin
      Levels.Items[0].Color := TAlphaColor($FFFFFFFF); //transparent
    end;