TdxChartAxisValueLabels Class

Stores axis value label appearance and behavior settings.

Declaration

TdxChartAxisValueLabels = class(
    TdxChartCustomLabels
)

Remarks

Value labels mark values on an axis.

VCL Chart Control: Value Labels on X and Y Axes

Main API Members

The list below outlines key members of the TdxChartAxisValueLabels class. These members allow you to configure axis value labels.

Angle: Rotates axis value labels clockwise or counterclockwise.
Appearance: Provides access to general axis value label appearance settings.
Assign: Copies value label appearance and behavior settings between axes.
MaxWidth | MaxLineCount: Limit the width of value labels and the maximum number of text lines in them.
Position: Positions value labels inside or outside the parent diagram area.
ResolveOverlappingIndent: Adjusts the offset used in the label overlap resolution algorithm.
TextFormat: Allows you to apply a formatting pattern to axis value labels.
Visible: Hides or displays axis value labels.

Tip

You can handle the parent diagram’s OnGetAxisValueLabelDrawParameters event to customize individual axis value labels.

Code Example

The following code example applies identical value label appearance settings to the main X and Y axes in a diagram:

Delphi
C++

var
  ADiagram: TdxChartXYDiagram;
begin
  if dxChartControl1.DiagramCount = 0 then Exit;
  ADiagram := dxChartControl1.Diagrams[0] as TdxChartXYDiagram;
  ADiagram.BeginUpdate;
  try
    ADiagram.Axes.AxisX.ValueLabels.Angle := 45;
    ADiagram.Axes.AxisX.ValueLabels.Appearance.FontOptions.Style := [fsBold, fsItalic];
    ADiagram.Axes.AxisX.ValueLabels.Appearance.TextColor := TdxAlphaColors.Gray;
    ADiagram.Axes.AxisY.Assign(ADiagram.Axes.AxisX); // Copies settings between axes
    ADiagram.Axes.AxisY.Interlaced := False; // Restores the previous Interlaced property value
  finally
    ADiagram.EndUpdate;
  end;
end;

  TdxChartXYDiagram *ADiagram;
  // ...
  if(dxChartControl1->DiagramCount == 0) { return; }
  ADiagram = dynamic_cast<TdxChartXYDiagram*>(dxChartControl1->Diagrams[0]);
  ADiagram->BeginUpdate();
  try
  {
    ADiagram->Axes->AxisX->ValueLabels->Angle = 45;
    ADiagram->Axes->AxisX->ValueLabels->Appearance->FontOptions->Style = TFontStyles() << fsBold, << fsItalic;
    ADiagram->Axes->AxisX->ValueLabels->Appearance->TextColor = TdxAlphaColors::Gray;
    ADiagram->Axes->AxisY->Assign(ADiagram->Axes->AxisX);  // Copies settings between axes
    ADiagram->Axes->AxisY->Interlaced = false;  // Restores the previous Interlaced property value
  }
  __finally
  {
    ADiagram->EndUpdate();
  }

Angle

VCL Chart Control: An Axis Value Label Customization Example