MapControl.ZoomToFitLayerItems(IEnumerable<LayerBase>, Double) Method

Zooms the map to fit items contained in the specified set of LayerBase class descendant objects.

Namespace: DevExpress.XtraMap

Assembly: DevExpress.XtraMap.v23.2.dll

NuGet Package: DevExpress.Win.Map

Declaration

C#

public void ZoomToFitLayerItems(
    IEnumerable<LayerBase> layers,
    double paddingFactor
)

VB.NET

Public Sub ZoomToFitLayerItems(
    layers As IEnumerable(Of LayerBase),
    paddingFactor As Double
)

Parameters

Name	Type	Description
layers	IEnumerable<LayerBase>	A IEnumerable object, containing LayerBase class descendant objects.
paddingFactor	Double	A Double value, which tunes the border size around visible map items.

Remarks

When vector items are loaded at runtime, the ZoomToFitLayerItems method should be called from LayerBase.DataLoaded event handler.

The ZoomToFitLayerItems method works as follows:

• Calculates a bounding box around items.

  

• Zooms the map to fit the box. Note that the padding factor is applied to the larger dimension of the box.

  The following image shows an instance of a horizontal dimension that is larger than the vertical (“PF” means “Padding Factor” on images).

  

  When the vertical dimension is larger than the horizontal, the zoom appears as follows:

  

  Note that the padding factor is divided by two for each side of the region.

Example

The following image shows a map that is zoomed with paddingFactor equal to 0.3:

C#

using DevExpress.XtraMap;

private void OnVectorLayerDataLoaded(object sender, DataLoadedEventArgs e) {
    mapControl1.ZoomToFitLayerItems(new LayerBase[] { vectorLayer }, 0.3);
}

VB.NET

Imports DevExpress.XtraMap

Private Sub OnVectorLayerDataLoaded(ByVal sender As Object, ByVal e As DataLoadedEventArgs)
    mapControl1.ZoomToFitLayerItems(New LayerBase() {vectorLayer}, 0.3)
End Sub