IMapNumericScale.Exact

Syntax

Exact(Index: Integer): Double;

Parameters

Index. Scale tick mark index.

Description

The Exact property determines the number for the values equal to scale tick mark value.

Example

Executing the example requires a form with the following components: the Button component named Button1, the MapBox component named MapBox1, and the UiMap component named UiMap1. UiMap1 is a data source for MapBox1. The VisualDataAdapter class, that creates a dynamic data source, must also be implemented. The class example is contained in the IMapVisual.DataAdapter property description.

The example is a handler of the OnClick event for the Button1 component.

Add links to the ExtCtrls, Forms, and Map system assemblies.

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;
    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.

See also:

IMapNumericScale