ArcEngine符号化——点符号选择器

1、前言

前面的博客介绍了在ArcEngine中如何创建各类符号，但是回顾一下ArcMap中的操作，你肯定会想：一个一个创建符号实在是太过麻烦，如果有一个符号选择器供我们使用就好了。这篇博客就来介绍一下如何创建一个如下图所示的点符号选择器。

2、符号样式文件

对于ArcEngine来说，它是不能直接使用ArcMap中的符号库的，它能使用的是一种后缀名为*.ServerStyle的文件。以我的电脑为例，我将ArcGIS安装在了C:\Program Files (x86)\目录下，则ServerStyle文件就在C:\Program Files (x86)\ArcGIS\Desktop10.2\Styles\目录下，找到"C:\Program Files (x86)\ArcGIS\Desktop10.2\Styles\zh-CN\ESRI.ServerStyle"，把它复制到工程的Debug目录下即可。

3、实现代码

3.1、主界面代码

using System.Windows.Forms;
using ESRI.ArcGIS.Carto;
using ESRI.ArcGIS.Controls;
using ESRI.ArcGIS.Geometry;namespace Win
{public partial class frmMain : Form{public frmMain(){InitializeComponent();axMapControl1.LoadMxFile(@"C:\Users\DSF\Desktop\data\无标题.mxd");}// axTOCControl1_OnMouseDownprivate void axTOCControl1_OnMouseDown(object sender, ESRI.ArcGIS.Controls.ITOCControlEvents_OnMouseDownEvent e){esriTOCControlItem item = esriTOCControlItem.esriTOCControlItemNone;IBasicMap pBasicMap = null;ILayer pLayer = null;object unk = null;object data = null;axTOCControl1.HitTest(e.x, e.y, ref item, ref pBasicMap, ref pLayer, ref unk, ref data);// 弹出符号选择器if (e.button == 1){if (item == esriTOCControlItem.esriTOCControlItemLegendClass){if (pLayer is IFeatureLayer){IFeatureLayer pFeatureLayer = pLayer as IFeatureLayer;if (pFeatureLayer.FeatureClass.ShapeType == esriGeometryType.esriGeometryPoint){ILegendGroup pLegendGroup = unk as ILegendGroup;ILegendClass pLegendClass = pLegendGroup.get_Class((int)data);frmMarkerSymbol frm = new frmMarkerSymbol(axMapControl1.Object as IMapControlDefault, pLayer, pLegendClass);frm.ShowDialog();}}}}}}
}

3.2、符号选择器代码

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;
using ESRI.ArcGIS.Carto;
using ESRI.ArcGIS.Controls;
using ESRI.ArcGIS.Display;
using stdole;namespace Win
{public partial class frmMarkerSymbol : Form{/// <summary>/// 地图符号对象/// </summary>private IMapControlDefault m_mapControl;private ILayer m_Layer;private ILegendClass m_LegendClass;private ISymbologyStyleClass m_SymbologyStyleClass;/// <summary>/// 符号属性集合/// </summary>private Dictionary<int, double> sizes;private Dictionary<int, double> angles;private Dictionary<int, Color> colors;/// <summary>/// 构造函数/// </summary>public frmMarkerSymbol(IMapControlDefault m_mapControl, ILayer m_Layer, ILegendClass m_LegendClass){InitializeComponent();// 初始化地图符号对象this.m_mapControl = m_mapControl;this.m_Layer = m_Layer;this.m_LegendClass = m_LegendClass;// 初始化符号属性集合this.sizes = new Dictionary<int, double>();this.angles = new Dictionary<int, double>();this.colors = new Dictionary<int, Color>();// 初始化符号控件Init();}/// <summary>/// 初始化控件/// </summary>private void Init(){axSymbologyControl1.LoadStyleFile(AppDomain.CurrentDomain.BaseDirectory + "ESRI.ServerStyle");axSymbologyControl1.StyleClass = esriSymbologyStyleClass.esriStyleClassMarkerSymbols;m_SymbologyStyleClass = axSymbologyControl1.GetStyleClass(axSymbologyControl1.StyleClass);// 添加当前符号IStyleGalleryItem pStyleGalleryItem = new ServerStyleGalleryItem();pStyleGalleryItem.Name = "当前符号";pStyleGalleryItem.Item = m_LegendClass.Symbol;m_SymbologyStyleClass.AddItem(pStyleGalleryItem, 0);// 符号属性集合for (int i = 0; i < m_SymbologyStyleClass.get_ItemCount(); i++){IStyleGalleryItem item = m_SymbologyStyleClass.GetItem(i);IMarkerSymbol pMarkerSymbol = item.Item as IMarkerSymbol;if (!sizes.ContainsKey(item.ID)){sizes.Add(item.ID, pMarkerSymbol.Size);}if (!angles.ContainsKey(item.ID)){angles.Add(item.ID, pMarkerSymbol.Angle);}if (!colors.ContainsKey(item.ID)){colors.Add(item.ID, ConvertToColor(pMarkerSymbol.Color));}}m_SymbologyStyleClass.SelectItem(0);}/// <summary>/// 双击选中符号/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void axSymbologyControl1_OnDoubleClick(object sender, ISymbologyControlEvents_OnDoubleClickEvent e){btnOk.PerformClick();}/// <summary>/// 切换符号/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void axSymbologyControl1_OnItemSelected(object sender, ISymbologyControlEvents_OnItemSelectedEvent e){IStyleGalleryItem pStyleGalleryItem = e.styleGalleryItem as IStyleGalleryItem;nudSize.Value = (decimal)sizes[pStyleGalleryItem.ID];nudAngle.Value = (decimal)angles[pStyleGalleryItem.ID];btnColor.BackColor = colors[pStyleGalleryItem.ID];// 预览IMarkerSymbol pMarkerSymbol = pStyleGalleryItem.Item as IMarkerSymbol;pMarkerSymbol.Size = sizes[pStyleGalleryItem.ID];pMarkerSymbol.Angle = angles[pStyleGalleryItem.ID];pMarkerSymbol.Color = ConvertToRgbColor(colors[pStyleGalleryItem.ID]);PriviewSymbol(pStyleGalleryItem);}/// <summary>/// 切换颜色/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void btnColor_Click(object sender, EventArgs e){ColorDialog colorDialog = new ColorDialog();if (colorDialog.ShowDialog() == DialogResult.OK){btnColor.BackColor = colorDialog.Color;// 预览IStyleGalleryItem pStyleGalleryItem = m_SymbologyStyleClass.GetSelectedItem();IMarkerSymbol pMarkerSymbol = pStyleGalleryItem.Item as IMarkerSymbol;pMarkerSymbol.Size = (double)nudSize.Value;pMarkerSymbol.Angle = (double)nudAngle.Value;pMarkerSymbol.Color = ConvertToRgbColor(btnColor.BackColor);PriviewSymbol(pStyleGalleryItem);}}/// <summary>/// 切换尺寸/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void nudSize_ValueChanged(object sender, EventArgs e){// 预览IStyleGalleryItem pStyleGalleryItem = m_SymbologyStyleClass.GetSelectedItem();IMarkerSymbol pMarkerSymbol = pStyleGalleryItem.Item as IMarkerSymbol;pMarkerSymbol.Size = (double)nudSize.Value;pMarkerSymbol.Angle = (double)nudAngle.Value;pMarkerSymbol.Color = ConvertToRgbColor(btnColor.BackColor);PriviewSymbol(pStyleGalleryItem);}/// <summary>/// 切换角度/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void nudAngle_ValueChanged(object sender, EventArgs e){// 预览IStyleGalleryItem pStyleGalleryItem = m_SymbologyStyleClass.GetSelectedItem();IMarkerSymbol pMarkerSymbol = pStyleGalleryItem.Item as IMarkerSymbol;pMarkerSymbol.Size = (double)nudSize.Value;pMarkerSymbol.Angle = (double)nudAngle.Value;pMarkerSymbol.Color = ConvertToRgbColor(btnColor.BackColor);PriviewSymbol(pStyleGalleryItem);}/// <summary>/// 确定/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void btnOk_Click(object sender, EventArgs e){IGeoFeatureLayer pGeoFeatureLayer = m_Layer as IGeoFeatureLayer;IFeatureRenderer pFeatureRenderer = pGeoFeatureLayer.Renderer;ISimpleRenderer pSimpleRenderer = pFeatureRenderer as ISimpleRenderer;pSimpleRenderer.Symbol = m_SymbologyStyleClass.GetSelectedItem().Item as ISymbol;m_mapControl.Refresh();this.Close();}/// <summary>/// 取消/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void btnCancel_Click(object sender, EventArgs e){this.Close();}/// <summary>/// Color转换为IColor/// </summary>/// <param name="color"></param>/// <returns></returns>private IColor ConvertToRgbColor(Color color){IColor pColor = new RgbColor();pColor.RGB = color.R + color.G * 256 + color.B * 65536;return pColor;}/// <summary>/// IColor转换为Color/// </summary>/// <param name="pColor"></param>/// <returns></returns>private Color ConvertToColor(IColor pColor){return ColorTranslator.FromOle(pColor.RGB);}/// <summary>/// 预览符号/// </summary>private void PriviewSymbol(IStyleGalleryItem pStyleGalleryItem){IPictureDisp pPictureDisp = m_SymbologyStyleClass.PreviewItem(pStyleGalleryItem, picMarkerSymbol.Width, picMarkerSymbol.Height);Image priviewImage = Image.FromHbitmap(new IntPtr(pPictureDisp.Handle));picMarkerSymbol.Image = priviewImage;}}
}

运行结果如下图所示：

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ArcEngine符号化——点符号选择器

1、前言

2、符号样式文件

3、实现代码

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