Create a menu in the main form
Create a unique value symbolic menu in windows forms
Add unique value symbolization class (ArcGISClass)
New UniqueValuesSymbol class
Add the code to start the symbolic window in the public override void OnClick() function in the class
The complete code is as follows:
using System;
using System.Drawing;
using System.Runtime.InteropServices;
using ESRI.ArcGIS.ADF.BaseClasses;
using ESRI.ArcGIS.ADF.CATIDs;
using ESRI.ArcGIS.Controls;
namespace Visualization
{
/// <summary>
/// Command that works in ArcMap/Map/PageLayout
/// </summary>
[Guid("d69af886-1d43-49e8-9242-e24440940e8d")]
[ClassInterface(ClassInterfaceType.None)]
[ProgId("Visualization.UniqueValuesSymbolCmd")]
public sealed class UniqueValuesSymbolCmd : BaseCommand
{
#region COM Registration Function(s)
[ComRegisterFunction()]
[ComVisible(false)]
static void RegisterFunction(Type registerType)
{
// Required for ArcGIS Component Category Registrar support
ArcGISCategoryRegistration(registerType);
//
// TODO: Add any COM registration code here
//
}
[ComUnregisterFunction()]
[ComVisible(false)]
static void UnregisterFunction(Type registerType)
{
// Required for ArcGIS Component Category Registrar support
ArcGISCategoryUnregistration(registerType);
//
// TODO: Add any COM unregistration code here
//
}
#region ArcGIS Component Category Registrar generated code
/// <summary>
/// Required method for ArcGIS Component Category registration -
/// Do not modify the contents of this method with the code editor.
/// </summary>
private static void ArcGISCategoryRegistration(Type registerType)
{
string regKey = string.Format("HKEY_CLASSES_ROOT\\CLSID\\{
{
{0}}}", registerType.GUID);
MxCommands.Register(regKey);
ControlsCommands.Register(regKey);
}
/// <summary>
/// Required method for ArcGIS Component Category unregistration -
/// Do not modify the contents of this method with the code editor.
/// </summary>
private static void ArcGISCategoryUnregistration(Type registerType)
{
string regKey = string.Format("HKEY_CLASSES_ROOT\\CLSID\\{
{
{0}}}", registerType.GUID);
MxCommands.Unregister(regKey);
ControlsCommands.Unregister(regKey);
}
#endregion
#endregion
private IHookHelper m_hookHelper = null;
public UniqueValuesSymbolCmd()
{
base.m_category = "Visualization";
base.m_caption = "唯一值符号化";
base.m_message = "唯一值符号化";
base.m_toolTip = "唯一值符号化";
base.m_name = "UniqueValuesSymbolCmd";
try
{
string bitmapResourceName = GetType().Name + ".bmp";
base.m_bitmap = new Bitmap(GetType(), bitmapResourceName);
}
catch (Exception ex)
{
System.Diagnostics.Trace.WriteLine(ex.Message, "Invalid Bitmap");
}
}
#region Overridden Class Methods
/// <summary>
/// Occurs when this command is created
/// </summary>
/// <param name="hook">Instance of the application</param>
public override void OnCreate(object hook)
{
if (hook == null)
return;
try
{
m_hookHelper = new HookHelperClass();
m_hookHelper.Hook = hook;
if (m_hookHelper.ActiveView == null)
m_hookHelper = null;
}
catch
{
m_hookHelper = null;
}
if (m_hookHelper == null)
base.m_enabled = false;
else
base.m_enabled = true;
// TODO: Add other initialization code
}
/// <summary>
/// Occurs when this command is clicked
/// </summary>
public override void OnClick()
{
if (m_hookHelper == null) return;
if (m_hookHelper.FocusMap.LayerCount > 0)
{
UniqueValuesSymbol symbol = new UniqueValuesSymbol(m_hookHelper);
symbol.Show(m_hookHelper as System.Windows.Forms.IWin32Window);
}
}
#endregion
}
}
The public override void OnClick() function adds the code as
public override void OnClick()
{
if (m_hookHelper == null) return;
if (m_hookHelper.FocusMap.LayerCount > 0)
{
UniqueValuesSymbol symbol = new UniqueValuesSymbol(m_hookHelper);
symbol.Show(m_hookHelper as System.Windows.Forms.IWin32Window);
}
}
Start a single symbolic class (ArcGISClass)
Add start single symbolization class (ArcGISClass) in single symbolization menu click event
private void 唯一值符号化ToolStripMenuItem_Click(object sender, EventArgs e)
{
ICommand command = new Visualization.UniqueValuesSymbolCmd();
command.OnCreate(axMapControl1.Object);
command.OnClick();
}Click the menu to start the symbolized form through the unique value symbolization class
Newly created symbolization settings form
Select the symbolized layer, select the symbolized attribute field, and click the symbolized button to randomly match colors.
code show as below:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using ESRI.ArcGIS.Controls;
using ESRI.ArcGIS.Carto;
using ESRI.ArcGIS.Display;
using ESRI.ArcGIS.DisplayUI;
using ESRI.ArcGIS.Geometry;
using ESRI.ArcGIS.Geodatabase;
using ESRI.ArcGIS.esriSystem;
namespace Visualization
{
public partial class UniqueValuesSymbol : Form
{
IHookHelper m_hookHelper = null;
IActiveView m_activeView = null;
IMap m_map = null;
IFeatureLayer layer2Symbolize = null;
string strRendererField = string.Empty;
IColorRamp colorRamp = null;
ISymbol gloabalSymbol = null;
public UniqueValuesSymbol(IHookHelper hookHelper)
{
InitializeComponent();
m_hookHelper = hookHelper;
m_activeView = m_hookHelper.ActiveView;
m_map = m_hookHelper.FocusMap;
}
private void UniqueValuesSymbol_Load(object sender, EventArgs e)
{
CbxLayersAddItems();
}
private void cbxLayers2Symbolize_SelectedIndexChanged(object sender, EventArgs e)
{
if (cbxLayers2Symbolize.SelectedItem != null)
{
string strLayer2Symbolize = cbxLayers2Symbolize.SelectedItem.ToString();
layer2Symbolize = GetFeatureLayer(strLayer2Symbolize);
CbxFieldAdditems(layer2Symbolize);
strRendererField = cbxFields.Items[0].ToString();
cbxFields.Text = strRendererField;
}
}
private void CbxFieldAdditems(IFeatureLayer featureLayer)
{
IFields fields = featureLayer.FeatureClass.Fields;
IField field = null;
cbxFields.Items.Clear();
for (int i = 0; i < fields.FieldCount; i++)
{
field = fields.get_Field(i);
if (field.Type != esriFieldType.esriFieldTypeGeometry)
cbxFields.Items.Add(field.Name);
}
}
private void CbxLayersAddItems()
{
if (GetLayers() == null) return;
IEnumLayer layers = GetLayers();
layers.Reset();
ILayer layer = layers.Next();
while (layer != null)
{
if (layer is IFeatureLayer)
{
cbxLayers2Symbolize.Items.Add(layer.Name);
}
layer = layers.Next();
}
}
private int GetUniqueValuesCount(IFeatureClass featureClass, string strField)
{
ICursor cursor = (ICursor)featureClass.Search(null, false);
IDataStatistics dataStatistics = new DataStatisticsClass();
dataStatistics.Field = strField;
dataStatistics.Cursor = cursor;
System.Collections.IEnumerator enumerator = dataStatistics.UniqueValues;
return dataStatistics.UniqueValueCount;
}
private System.Collections.IEnumerator GetUniqueValues(IFeatureClass featureClass, string strField)
{
ICursor cursor = (ICursor)featureClass.Search(null, false);
IDataStatistics dataStatistics = new DataStatisticsClass();
dataStatistics.Field = strField;
dataStatistics.Cursor = cursor;
System.Collections.IEnumerator enumerator = dataStatistics.UniqueValues;
return enumerator;
}
private void btnSymbolize_Click(object sender, EventArgs e)
{
if (layer2Symbolize == null) return;
Renderer();
}
private void Renderer()
{
IGeoFeatureLayer pGeoFeatureL = (IGeoFeatureLayer)layer2Symbolize;
IFeatureClass featureClass = pGeoFeatureL.FeatureClass;
//找出rendererField在字段中的编号
int lfieldNumber = featureClass.FindField(strRendererField);
if (lfieldNumber == -1)
{
MessageBox.Show("Can't find field called " + strRendererField);
return;
}
IUniqueValueRenderer pUniqueValueR = CreateRenderer(featureClass);
if (pUniqueValueR == null) return;
pGeoFeatureL.Renderer = (IFeatureRenderer)pUniqueValueR;
m_activeView.PartialRefresh(esriViewDrawPhase.esriViewGeography, null, m_activeView.Extent);
}
private IEnumColors GetEnumColorsByRandomColorRamp(int colorSize)
{
IRandomColorRamp pColorRamp = new RandomColorRampClass();
pColorRamp.StartHue = 0; //0
pColorRamp.EndHue = 360; //360
pColorRamp.MinSaturation = 15; //15
pColorRamp.MaxSaturation = 30; //30
pColorRamp.MinValue = 99; //99
pColorRamp.MaxValue = 100; //100
pColorRamp.Size = colorSize;
bool ok = true;
pColorRamp.CreateRamp(out ok);
IEnumColors pEnumRamp = pColorRamp.Colors;
pEnumRamp.Reset();
return pEnumRamp;
}
private IEnumColors GetEnumColorsBySelectColorRamp(int colorSize)
{
if (colorRamp == null)
{
MessageBox.Show("请选择色带...", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
return null;
}
colorRamp.Size = colorSize;
bool createRamp;
colorRamp.CreateRamp(out createRamp);
IEnumColors enumColors = colorRamp.Colors;
enumColors.Reset();
return enumColors;
}
private IUniqueValueRenderer CreateRenderer(IFeatureClass featureClass)
{
int uniqueValuesCount = GetUniqueValuesCount(featureClass, strRendererField);
System.Collections.IEnumerator enumerator = GetUniqueValues(featureClass, strRendererField);
if (uniqueValuesCount == 0) return null;
IEnumColors pEnumRamp = GetEnumColorsByRandomColorRamp(uniqueValuesCount);
//IEnumColors pEnumRamp = GetEnumColorsBySelectColorRamp(uniqueValuesCount);
pEnumRamp.Reset();
IUniqueValueRenderer pUniqueValueR = new UniqueValueRendererClass();
//只用一个字段进行单值着色
pUniqueValueR.FieldCount = 1;
//用于区分着色的字段
pUniqueValueR.set_Field(0, strRendererField);
IColor pColor = null;
ISymbol symbol = null;
enumerator.Reset();
while (enumerator.MoveNext())
{
object codeValue = enumerator.Current;
pColor = pEnumRamp.Next();
switch (featureClass.ShapeType)
{
case ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPoint:
ISimpleMarkerSymbol markerSymbol = new SimpleMarkerSymbolClass() as ISimpleMarkerSymbol;
markerSymbol.Color = pColor;
symbol = markerSymbol as ISymbol;
break;
case ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPolyline:
ISimpleLineSymbol lineSymbol = new SimpleLineSymbolClass() as ISimpleLineSymbol;
lineSymbol.Color = pColor;
symbol = lineSymbol as ISymbol;
break;
case ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPolygon:
ISimpleFillSymbol fillSymbol = new SimpleFillSymbolClass() as ISimpleFillSymbol;
fillSymbol.Color = pColor;
symbol = fillSymbol as ISymbol;
break;
default:
break;
}
//将每次得到的要素字段值和修饰它的符号放入着色对象中
pUniqueValueR.AddValue(codeValue.ToString(), strRendererField, symbol);
}
return pUniqueValueR;
}
private void btnClose_Click(object sender, EventArgs e)
{
this.Close();
}
#region "GetLayers"
private IEnumLayer GetLayers()
{
UID uid = new UIDClass();
uid.Value = "{40A9E885-5533-11d0-98BE-00805F7CED21}";// IFeatureLayer
//uid.Value = "{E156D7E5-22AF-11D3-9F99-00C04F6BC78E}"; // IGeoFeatureLayer
//uid.Value = "{6CA416B1-E160-11D2-9F4E-00C04F6BC78E}"; // IDataLayer
if (m_map.LayerCount != 0)
{
IEnumLayer layers = m_map.get_Layers(uid, true);
return layers;
}
return null;
}
#endregion
#region "GetFeatureLayer"
private IFeatureLayer GetFeatureLayer(string layerName)
{
//get the layers from the maps
if (GetLayers() == null) return null;
IEnumLayer layers = GetLayers();
layers.Reset();
ILayer layer = null;
while ((layer = layers.Next()) != null)
{
if (layer.Name == layerName)
return layer as IFeatureLayer;
}
return null;
}
#endregion
private void cbxFields_SelectedIndexChanged(object sender, EventArgs e)
{
if (cbxFields.SelectedItem != null)
strRendererField = cbxFields.SelectedItem.ToString();
}
private void button1_Click(object sender, EventArgs e)
{
gloabalSymbol = GetSymbolBySymbolSelector(layer2Symbolize.FeatureClass.ShapeType);
}
private void button2_Click(object sender, EventArgs e)
{
ColorRampForm colorRampForm = new ColorRampForm();
colorRampForm.ShowDialog();
colorRamp = colorRampForm.m_styleGalleryItem.Item as IColorRamp;
colorRampForm.Dispose();
}
private ISymbol GetSymbolBySymbolSelector(esriGeometryType geometryType)
{
ISymbolSelector pSymbolSelector = new SymbolSelectorClass();
ISymbol symbol = null;
switch (geometryType)
{
case ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPoint:
symbol = new SimpleMarkerSymbolClass();
break;
case ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPolyline:
symbol = new SimpleLineSymbolClass();
break;
case ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPolygon:
symbol = new SimpleFillSymbolClass();
break;
default:
break;
}
pSymbolSelector.AddSymbol(symbol);
bool response = pSymbolSelector.SelectSymbol(0);
if (response)
{
symbol = pSymbolSelector.GetSymbolAt(0);
return symbol;
}
return null;
}
}
}
Most of the code in this article comes from sample code! Welcome to exchange and learn. The TOC in the source code will be refreshed in real time after the symbology is set. After transplanting to other projects, the legend in the TOC control will not refresh in time. New data will be refreshed. The root cause has not been found yet.