IMapNumericScale.NoData

Syntax

NoData(Index: Integer): Double;

Parameters

Index - scale tick mark index.

Description

The NoData property determines the number for the missing values.

Example

Executing the example requires a form, a button named Button1 on the form, the UiMap component named UiMap1 that is a data source for the MapBox component. The map must be connected to the UiMap1 component. The VisualDataAdapter class, that creates a dynamic data source, must also be implemented. The class example is contained in the IMapVisual.DataAdapter property description.

Sub Button1OnClick(Sender: Object; Args: IMouseEventArgs);

Var

Map: IMap;

Layer: IMapLayer;

BarVisual: IMapBarVisual;

Height: IMapVisualNumericProperty;

Scale: IMapNumericScale;

Begin

Map := UiMap1.Map;

Layer := Map.Layers.FindByName("Regions");

BarVisual := Layer.Visuals.AddBarVisual;

BarVisual.DataAdapter := New VisualDataAdapter.Create As IMapDynamicDataAdapter;

Height := BarVisual.Height;

Height.DataAdapter := BarVisual.DataAdapter;

Height.Dependent := True;

Scale := New DxMapNumericScale.Create As IMapNumericScale;

Scale.Count := 1;

Scale.Value(0) := 50;

Scale.NoData(0) := 0;

Scale.Greater(0) := 2;

Scale.Exact(0) := 4;

Scale.Less(0) := 6;

Height.Scale := Scale;

End Sub Button1OnClick;

After executing the example the bar indicator, which height is determined using the scale, is added to the Regions layer.