ChoroplethColorizer.RangeDistribution Property

Gets or sets the distribution type of range colors in a colorizer.

Namespace: DevExpress.XtraMap

Assembly: DevExpress.XtraMap.v20.1.dll

Declaration

public IRangeDistribution RangeDistribution { get; set; }
Public Property RangeDistribution As IRangeDistribution

Property Value

Type Description
DevExpress.Map.IRangeDistribution

An object implementing the DevExpress.Map.IRangeDistribution interface.

Examples

Set the LinearRangeDistribution, LogarithmicRangeDistribution or ExponentialRangeDistribution object to the ChoroplethColorizer.RangeDistribution property. Note that if the ChoroplethColorizer.ApproximateColors property value equals false, shapes with values inside one range interval have the same color.

using System;
using System.Collections.Generic;
using System.Windows.Forms;
using DevExpress.Map;
using DevExpress.XtraMap;

namespace RangeDistributions {
    public partial class Form1 : Form {
        const string filepath = "../../Data/Countries.shp";

        List<RangeDistributionBase> distributions = new List<RangeDistributionBase>{ 
            new LinearRangeDistribution(),
            new LogarithmicRangeDistribution(),
            new ExponentialRangeDistribution()
        };

        VectorItemsLayer MapLayer { get { return (VectorItemsLayer)mapControl1.Layers["MapLayer"]; } }
        ChoroplethColorizer Colorizer { get { return (ChoroplethColorizer)MapLayer.Colorizer; } }
        ShapefileDataAdapter Adapter { get { return (ShapefileDataAdapter)MapLayer.Data; } }

        public Form1() {
            InitializeComponent();

            cbRangeDistribution.DataSource = distributions;

            Uri baseUri = new Uri(System.Reflection.Assembly.GetEntryAssembly().Location);
            Adapter.FileUri = new Uri(baseUri, filepath);
        }

        private void cbRangeDistribution_SelectedIndexChanged(object sender, EventArgs e) {
            RangeDistributionBase selectedDistribution = cbRangeDistribution.SelectedItem as RangeDistributionBase;
            if (selectedDistribution == null) return;

            if (selectedDistribution.Equals(distributions[0])) seFactor.Enabled = false;
            else {
                seFactor.Enabled = true;
                EquationRangeDistribution eqDistribution = selectedDistribution as EquationRangeDistribution;
                eqDistribution.Factor = (double)seFactor.Value;
            }

            Colorizer.RangeDistribution = selectedDistribution;
        }

        private void seFactor_EditValueChanged(object sender, EventArgs e) {
            EquationRangeDistribution distribution = Colorizer.RangeDistribution as EquationRangeDistribution;
            if (distribution == null) return;

            distribution.Factor = (double)seFactor.Value;
        }

        #region #ApproximateColors
        private void cbApproximateColors_CheckedChanged(object sender, EventArgs e) {
            Colorizer.ApproximateColors = cbApproximateColors.Checked;
        }
        #endregion #ApproximateColors
    }
}
See Also