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GraphColorizer Class

Represents the Graph colorizer utilized to paint shapes that have a common border using different colors.

Namespace: DevExpress.XtraMap

Assembly: DevExpress.XtraMap.v19.1.dll

Declaration

public class GraphColorizer :
    GenericColorizer<ColorizerColorItem>
Public Class GraphColorizer
    Inherits GenericColorizer(Of ColorizerColorItem)

Remarks

To colorize vector items using this colorizer, assign a GraphColorizer object to the VectorItemsLayer.Colorizer property. Then, add ColorizerColorItem objects to the GraphColorizer.ColorItems.

For more information, refer to Colorizers.

Examples

This example demonstrates how to paint map contours loaded from a Shapefile (Countries.shp) using the graph colorizer.

To accomplish this task, create a graph colorizer (the GraphColorizer object) and assign it to the VectorItemsLayer.Colorizer property.

Then, specify the desired set of colors in the GenericColorizerItemCollection<T> object that is accessed via the GraphColorizer.ColorItems property.

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

namespace MapGraphColorizer {
    public partial class Form1 : Form {
        public Form1() {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e) {

            // Create a map control and specify its dock style.
            MapControl map = new MapControl();
            map.Dock = DockStyle.Fill;

            // Specify the map's initial view.  
            map.ZoomLevel = 2;
            map.CenterPoint = new GeoPoint(38, -100);

            // Create a file layer and assign a shape loader to it.
            map.Layers.Add(new VectorItemsLayer() {
                Data = CreateData(),
                Colorizer = CreateColorizer()
            });

            // Add the map control to the window. 
            this.Controls.Add(map);
        }

        private IMapDataAdapter CreateData() {
            // Create an object to load data from a shapefile.
            ShapefileDataAdapter loader = new ShapefileDataAdapter();

            // Determine the path to the Shapefile.
            Uri baseUri = new Uri(System.Reflection.Assembly.GetEntryAssembly().Location);
            string shapefilePath = "../../Data/Countries.shp";
            loader.FileUri = new Uri(baseUri, shapefilePath);

            return loader;
        }

        private MapColorizer CreateColorizer() {
            // Create a graph colorizer.
            GraphColorizer colorizer = new GraphColorizer();

            // Specify colors for the colorizer.
            colorizer.ColorItems.AddRange(new List<ColorizerColorItem> { 
                new ColorizerColorItem(Color.FromArgb(0xF1, 0xC1, 0x49)), 
                new ColorizerColorItem(Color.FromArgb(0xE5, 0xA8, 0x4D)),
                new ColorizerColorItem(Color.FromArgb(0xC5, 0x64, 0x50)),
                new ColorizerColorItem(Color.FromArgb(0xD6, 0x86, 0x4E)),
                new ColorizerColorItem(Color.FromArgb(0x79, 0x96, 0x89)), 
                new ColorizerColorItem(Color.FromArgb(0xA2, 0xA8, 0x75))
            });
            return colorizer;
        }
    }
}
See Also