MapEditor.SimplifyItems(ShapeSimplifierBase, IEnumerable<MapItem>, Double) Method

Reduces the number of vertices that form the vector layer’s items with the specified simplification algorithm and tolerance.

Namespace: DevExpress.XtraMap

Assembly: DevExpress.XtraMap.v26.1.dll

NuGet Package: DevExpress.Win.Map

Declaration

C#

public void SimplifyItems(
    ShapeSimplifierBase shapeSimplifier,
    IEnumerable<MapItem> items,
    double tolerance
)

VB.NET

Public Sub SimplifyItems(
    shapeSimplifier As ShapeSimplifierBase,
    items As IEnumerable(Of MapItem),
    tolerance As Double
)

Parameters

Name	Type	Description
shapeSimplifier	ShapeSimplifierBase	The object that specifies the algorithm used to simplify items.
items	IEnumerable<MapItem>	The items to be simplified.
tolerance	Double	A percent of vertices that vector shapes contain after simplification. This value should be in the (0;100) range.

Remarks

The example below demonstrates how to use TrackBarControl to change the Tolerance parameter and utilize the SimplifyItems method to simplify items. This example uses the VisvalingamShapeSimplifier simplification algorithm.

C#

private void Form_Load(object sender, EventArgs e) {
    trackBarControl.Properties.Maximum = 100;
    trackBarControl.Properties.Minimum = 0;
    trackBarControl.Value = 100;
    trackBarControl.EditValueChanged += trackBarControl_EditValueChanged;
}
private void trackBarControl_EditValueChanged(object sender, EventArgs e) {
    double tolerance = Convert.ToDouble(trackBarControl.EditValue);
    mapControl.MapEditor.SimplifyItems(new VisvalingamShapeSimplifier(), mapLayer.Data.Items, tolerance);
}

VB.NET

Private Sub Form_Load(ByVal sender As Object, ByVal e As EventArgs)
    trackBarControl.Properties.Maximum = 100
    trackBarControl.Properties.Minimum = 0
    trackBarControl.Value = 100
    trackBarControl.EditValueChanged = (trackBarControl.EditValueChanged + trackBarControl_EditValueChanged)
End Sub

Private Sub trackBarControl_EditValueChanged(ByVal sender As Object, ByVal e As EventArgs)
    Dim tolerance As Double = Convert.ToDouble(trackBarControl.EditValue)
    mapControl.MapEditor.SimplifyItems(New VisvalingamShapeSimplifier, mapLayer.Data.Items, tolerance)
End Sub