MapControl.ZoomToFitLayerItems(Double) Method
Zooms a map to fit items contained in all layers of the map.
Namespace: DevExpress.Xpf.Map
Assembly: DevExpress.Xpf.Map.v23.2.dll
NuGet Package: DevExpress.Wpf.Map
Declaration
Optional Parameters
| Name | Type | Default | Description |
|---|---|---|---|
| paddingFactor | Double | 0.15 | A Double object, which tunes the border size around visible map items. |
Remarks
The ZoomToFitLayerItems method works as follows:
Calculates a bounding box around map items contained in map layers.
Zooms the map to fit the box.
The padding factor is applied to the larger dimension of the bounding box that contains visible items.
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.
The following image shows a map with the padding factor parameter set at 0.3:
Example
To zoom in a map at application launch, call the ZoomToFitLayerItems method in the LayerBase.DataLoaded event handler:
<dxm:VectorLayer x:Name="layer1" DataLoaded="VectorLayer_DataLoaded">
<dxm:MapItemStorage>
<dxm:MapRectangle Height="21" Width="30">
<dxm:MapRectangle.Location>
<dxm:GeoPoint Longitude="41.3" Latitude="-54.5"/>
</dxm:MapRectangle.Location>
</dxm:MapRectangle>
</dxm:MapItemStorage>
</dxm:VectorLayer>
The DataLoaded event’s handler:
private void VectorLayer_DataLoaded(object sender, DataLoadedEventArgs e) {
mapControl.ZoomToFitLayerItems(0.3);
}