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_OnMouseDown
        private 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
    {
        /// 

        /// 地图符号对象
        /// 
        private IMapControlDefault m_mapControl;
        private ILayer m_Layer;
        private ILegendClass m_LegendClass;
        private ISymbologyStyleClass m_SymbologyStyleClass;

        /// 

        /// 符号属性集合
        /// 
        private Dictionary<int, double> sizes;
        private Dictionary<int, double> angles;
        private Dictionary<int, Color> colors;

        /// 

        /// 构造函数
        /// 
        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();
        }

        /// 

        /// 初始化控件
        /// 
        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);
        }

        /// 

        /// 双击选中符号
        /// 
        /// 
        /// 
        private void axSymbologyControl1_OnDoubleClick(object sender, ISymbologyControlEvents_OnDoubleClickEvent e)
        {
            btnOk.PerformClick();
        }

        /// 

        /// 切换符号
        /// 
        /// 
        /// 
        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);
        }

        /// 

        /// 切换颜色
        /// 
        /// 
        /// 
        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);
            }
        }

        /// 

        /// 切换尺寸
        /// 
        /// 
        /// 
        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);
        }

        /// 

        /// 切换角度
        /// 
        /// 
        /// 
        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);
        }

        /// 

        /// 确定
        /// 
        /// 
        /// 
        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();
        }

        /// 

        /// 取消
        /// 
        /// 
        /// 
        private void btnCancel_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        /// 

        /// Color转换为IColor
        /// 
        /// 
        /// 
        private IColor ConvertToRgbColor(Color color)
        {
            IColor pColor = new RgbColor();
            pColor.RGB = color.R + color.G * 256 + color.B * 65536;
            return pColor;
        }

        /// 

        /// IColor转换为Color
        /// 
        /// 
        /// 
        private Color ConvertToColor(IColor pColor)
        {
            return ColorTranslator.FromOle(pColor.RGB);
        }

        /// 

        /// 预览符号
        /// 
        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：