ArcGIS Engine开发之地图导出
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关于地图导出的方法有很多，但是核心技术就那么一点。下面是从项目实战中总结的一部分地图导出的方法：（以全域导出和区域导出为例）
1.由于地图导出用到的函数和方法容易重复，增加了工作量故首先将其进行封装成类（ExportMap类）：用到的主要接口为：IActiveView(活动视图接口)、IGeometry(几何接口)、IRgbColor（颜色接口）、IElement（要素接口）等。
具体的封装代码如下：
1 class ExportMap 2 { 3 #region 输出视图 4 public static void ExportView(IActiveView view, IGeometry pGeo, int Outputresoultion, int Width, int Height, string ExpPath, bool bRegion) 5 { 6 IExport pExport = null; 7 tagRECT exportrect = new tagRECT(); 8 IEnvelope pEnvelop = pGeo.Envelope; 9 string sType = System.IO.Path.GetExtension(ExpPath); 10 switch (sType) 11 { 12 case ".jpg": 13 pExport = new ExportJPEGClass(); 14 break; 15 case ".bmp": 16 pExport = new ExportBMPClass(); 17 break; 18 case ".gif": 19 pExport = new ExportGIFClass(); 20 break; 21 case ".tif": 22 pExport = new ExportTIFFClass(); 23 break; 24 case ".png": 25 pExport = new ExportPNGClass(); 26 break; 27 case ".pdf": 28 pExport = new ExportPDFClass(); 29 break; 30 default: 31 MessageBox.Show("没有输出格式，默认JPEG"); 32 pExport = new ExportJPEGClass(); 33 break; 34 } 35 pExport.ExportFileName = ExpPath; 36 exportrect.left = 0; 37 exportrect.top = 0; 38 exportrect.right = Width; 39 exportrect.bottom = Height; 40 if (bRegion) 41 { 42 view.GraphicsContainer.DeleteAllElements(); 43 view.Refresh(); 44 } 45 IEnvelope envelop = new EnvelopeClass(); 46 envelop.PutCoords((double)exportrect.left, (double)exportrect.top, (double)exportrect.right, (double)exportrect.bottom); 47 pExport.PixelBounds = envelop; 48 view.Output(pExport.StartExporting(), Outputresoultion, ref exportrect, pEnvelop, null); 49 pExport.FinishExporting(); 50 pExport.Cleanup(); 51 } 52 #endregion 53 #region 获取RGB颜色 54 private static IRgbColor GetRgbColor(int intR,int intG,int intB) 55 { 56 IRgbColor pRgbColor=null; 57 if(intR<0||intR>255||intG<0||intG>255||intB<0||intB>255) 58 { 59 return pRgbColor; 60 } 61 pRgbColor=new RgbColorClass(); 62 pRgbColor.Red=intR; 63 pRgbColor.Green=intG; 64 pRgbColor.Blue=intB; 65 return pRgbColor; 66 } 67 #endregion 68 #region 创建图形元素 69 /// <summary> 70 /// 71 /// </summary> 72 /// <param name="pGeomentry">几何图形</param> 73 /// <param name="lineColor">边框颜色</param> 74 /// <param name="fillColor">填充颜色</param> 75 /// <returns></returns> 76 public static IElement CreateElement(IGeometry pGeomentry, IRgbColor lineColor, IRgbColor fillColor) 77 { 78 if (pGeomentry == null || lineColor == null || fillColor == null) 79 { 80 return null; 81 } 82 IElement pElem = null; 83 try 84 { 85 if (pGeomentry is IEnvelope) 86 87 pElem = new RectangleElementClass(); 88 else if (pGeomentry is IPolygon) 89 pElem = new PolygonElementClass(); 90 else if (pGeomentry is ICircularArc) 91 { 92 ISegment pSegCircle = pGeomentry as ISegment; 93 ISegmentCollection pSegColl = new PolygonClass(); 94 object o = Type.Missing; 95 pSegColl.AddSegment(pSegCircle, ref o, ref o); 96 IPolygon pPolygon = pSegCircle as IPolygon; 97 pGeomentry = pPolygon as IGeometry; 98 pElem = new CircleElementClass(); 99 } 100 else if (pGeomentry is IPolyline) 101 pElem = new LineElementClass(); 102 if (pElem == null) 103 return null; 104 pElem.Geometry = pGeomentry; 105 IFillShapeElement pFElem = pElem as IFillShapeElement; 106 ISimpleFillSymbol pSymbol = new SimpleFillSymbolClass(); 107 pSymbol.Color=fillColor ; 108 pSymbol.Outline.Color=lineColor; 109 pSymbol.Style = esriSimpleFillStyle.esriSFSCross;//图形元素的样式 110 if (pSymbol == null) 111 { 112 return null; 113 } 114 pFElem.Symbol = pSymbol; 115 } 116 catch(Exception ex) 117 { 118 MessageBox.Show(ex.Message ); 119 } 120 return pElem; 121 } 122 #endregion 123 #region 视图窗口绘制几何图形元素 124 /// <summary> 125 /// 126 /// </summary> 127 /// <param name="pGeometry">几何图形</param> 128 /// <param name="activeView">活动视图</param> 129 public static void AddElement(IGeometry pGeometry,IActiveView activeView) 130 { 131 IRgbColor fillColor=GetRgbColor(204,175,235); 132 IRgbColor lineColor=GetRgbColor(0,0,0); 133 IElement pEle=CreateElement(pGeometry,lineColor,fillColor );//调用图形元素的函数 134 IGraphicsContainer pGC = activeView.GraphicsContainer; 135 if (pGC != null) 136 { 137 pGC.AddElement(pEle, 0); 138 activeView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, pEle, null); 139 } 140 } 141 #endregion 142 #region 全域导出 143 /// <summary> 144 /// 全域导出 145 /// </summary> 146 /// <param name="OutputResolution">输出分辨率</param> 147 /// <param name="ExpPath">输出路径</param> 148 /// <param name="view">视图</param> 149 public static void ExportActiveView(int OutputResolution, string ExpPath, IActiveView view) 150 { 151 IExport pExport = null; 152 tagRECT exportRect; 153 IEnvelope envelop2 = view.Extent; 154 int num = (int)Math.Round(view.ScreenDisplay.DisplayTransformation.Resolution); 155 string sType = System.IO.Path.GetExtension(ExpPath); 156 switch (sType) 157 { 158 case ".jgp": 159 pExport = new ExportJPEGClass(); 160 break; 161 case ".bmp": 162 pExport = new ExportBMPClass(); 163 break; 164 case ".gif": 165 pExport = new ExportGIFClass(); 166 break; 167 case ".tif": 168 pExport = new ExportTIFFClass(); 169 break; 170 case ".png": 171 pExport = new ExportPNGClass(); 172 break; 173 case ".pdf": 174 pExport = new ExportPDFClass(); 175 break; 176 default: MessageBox.Show("No Export Foemat,the default format is JPEG!"); 177 pExport = new ExportJPEGClass(); 178 break; 179 } 180 pExport.ExportFileName = ExpPath; 181 exportRect.left = 0; exportRect.top = 0; 182 exportRect.right = (int)Math.Round((double)(view.ExportFrame.right * (((double)OutputResolution) / ((double)num)))); 183 exportRect.bottom = (int)Math.Round((double)(view.ExportFrame.bottom * (((double)OutputResolution) / ((double)num)))); 184 IEnvelope envelop = new EnvelopeClass(); 185 envelop.PutCoords((double)exportRect.left, (double)exportRect.top, (double)exportRect.right, (double)exportRect.bottom); 186 pExport.PixelBounds = envelop; 187 view.Output(pExport.StartExporting(), OutputResolution, ref exportRect, envelop2, null); 188 pExport.FinishExporting(); 189 pExport.Cleanup(); 190 } 191 #endregion 192 #region 区域导出 193 /// <summary> 194 /// 区域导出 195 /// </summary> 196 /// <param name="pGeo">输出的图形</param> 197 /// <param name="OutputResolution">输出的范围</param> 198 /// <param name="ExpPath">输出路径</param> 199 /// <param name="view">视图</param> 200 public static void ExportRegion(IGeometry pGeo, int OutputResolution, string ExpPath, IActiveView view) 201 { 202 IExport export = null; 203 IWorldFileSettings setting = null; 204 IEnvelope envelope2 = pGeo.Envelope; 205 string str = ExpPath.Substring(ExpPath.Length - 3, 3).ToUpper(); 206 switch (str) 207 { 208 case "JPG": 209 setting = new ExportJPEGClass(); 210 export = new ExportJPEGClass(); 211 setting = export as IWorldFileSettings; 212 setting.MapExtent = envelope2; 213 setting.OutputWorldFile = false; 214 break; 215 case "BMP": 216 setting = new ExportBMPClass(); 217 export = new ExportBMPClass(); 218 setting = export as IWorldFileSettings; 219 setting.MapExtent = envelope2; 220 setting.OutputWorldFile = false; 221 break; 222 case "TIF": 223 setting = new ExportTIFFClass(); 224 export = new ExportTIFFClass(); 225 setting = export as IWorldFileSettings; 226 setting.MapExtent = envelope2; 227 setting.OutputWorldFile = false; 228 break; 229 case "PNG": 230 setting = new ExportPNGClass(); 231 export = new ExportPNGClass(); 232 setting = export as IWorldFileSettings; 233 setting.MapExtent = envelope2; 234 setting.OutputWorldFile = false; 235 break; 236 default: break; 237 } 238 if (setting == null) 239 { 240 export.ExportFileName = ExpPath; 241 int num = (int)Math.Round(view.ScreenDisplay.DisplayTransformation.Resolution); 242 tagRECT grect2 = new tagRECT();//实例化矩形 243 IEnvelope envelop3 = new EnvelopeClass(); 244 view.ScreenDisplay.DisplayTransformation.TransformRect(envelope2, ref grect2, 9); 245 grect2.left = 0; 246 grect2.top = 0; 247 grect2.right = (int)Math.Round((double)(grect2.right - grect2.left) * (((double)OutputResolution) / ((double)num))); 248 grect2.bottom = (int)Math.Round((double)((grect2.bottom - grect2.top) * (((double)OutputResolution) / ((double)num)))); 249 envelop3.PutCoords((double)grect2.left, (double)grect2.top, (double)grect2.right, (double)grect2.bottom); 250 export.PixelBounds = envelop3; 251 view.GraphicsContainer.DeleteAllElements(); 252 view.Output(export.StartExporting(), OutputResolution, ref grect2, envelope2, null); 253 export.FinishExporting(); 254 export.Cleanup(); 255 AddElement(pGeo, view); 256 } 257 258 } 259 #endregion 260 }
2.添加输出设置窗体，分别有，输出图片的高、宽、分辨率、输出保存路径、导出按钮。
具体的设置代码如下：
1 public partial class ExportMapForm : DevExpress.XtraEditors.XtraForm 2 { 3 //定义全局变量 4 private string pSavePath = ""; 5 private IActiveView pActiveView; 6 private IGeometry pGeometry = null; 7 #region 只读属性，地图导出空间图形 8 public IGeometry GetGeometry 9 { 10 set { pGeometry = value; } 11 } 12 private bool bRegion = true; 13 #endregion 14 /// <summary> 15 /// 只读属性，是全域导出还是区域导出 16 /// </summary> 17 public bool IsRegion 18 { 19 set { bRegion = value; } 20 } 21 22 //获取主窗口的MapControl控件 23 public ExportMapForm(AxMapControl mainAxMapControl) 24 { 25 InitializeComponent(); 26 27 pActiveView = mainAxMapControl.ActiveView; 28 29 } 30 31 private void ExportMapForm_Load(object sender, EventArgs e) 32 { 33 34 } 35 #region 输入窗口的大小 36 private void InitFormSize() 37 { 38 cboResoultion.Text = pActiveView.ScreenDisplay.DisplayTransformation.Resolution.ToString(); 39 cboResoultion.Items.Add(cboResoultion.Text); 40 if (bRegion) 41 { 42 IEnvelope pEnvelop = pGeometry.Envelope; 43 tagRECT pRECT = new tagRECT(); 44 pActiveView.ScreenDisplay.DisplayTransformation.TransformRect(pEnvelop, ref pRECT,15); 45 if (cboResoultion.Text != "") 46 { 47 txtWidth.Text = pRECT.right.ToString(); 48 txtHeight.Text = pRECT.bottom.ToString(); 49 } 50 } 51 else 52 { 53 if (cboResoultion.Text != "") 54 { 55 txtWidth.Text = pActiveView.ExportFrame.right.ToString(); 56 txtHeight.Text = pActiveView.ExportFrame.bottom.ToString(); 57 } 58 } 59 } 60 #endregion 61 #region combox的ChangeIndex事件 62 private void cboResoultion_SelectedIndexChanged(object sender, EventArgs e) 63 { 64 double num = (int)Math.Round(pActiveView.ScreenDisplay.DisplayTransformation.Resolution); 65 if (cboResoultion.Text == "") 66 { 67 txtWidth.Text = ""; 68 txtHeight.Text = ""; 69 return; 70 } 71 if (bRegion) 72 { 73以上是关于ArcGIS Engine开发之地图导出的主要内容，如果未能解决你的问题，请参考以下文章