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ArcGIS Engine开发之地图导出
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 #endregion123 #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 #endregion142 #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 #endregion192 #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 #endregion260 }
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 IEnvelope pEnvelop = pGeometry.Envelope; 74 tagRECT pRECT = new tagRECT(); 75 pActiveView.ScreenDisplay.DisplayTransformation.TransformRect(pEnvelop, ref pRECT,15); 76 if (cboResoultion.Text != "") 77 { 78 txtWidth.Text = Math.Round((double)(pRECT.right * (double.Parse(cboResoultion.Text) / (double)num))).ToString(); 79 } 80 } 81 else 82 { 83 txtWidth.Text = Math.Round((double)(pActiveView.ExportFrame.right * (double.Parse(cboResoultion.Text) / (double)num))).ToString(); 84 txtHeight.Text = Math.Round((double)(pActiveView.ExportFrame.bottom * (double.Parse(cboResoultion.Text) / (double)num))).ToString(); 85 } 86 } 87 #endregion 88 #region 保存按钮的单击事件 89 private void btnExPath_Click(object sender, EventArgs e) 90 { 91 SaveFileDialog sfdExportMap = new SaveFileDialog(); 92 sfdExportMap.DefaultExt = "jpg|bmp|gif|tif|png|pdf"; 93 sfdExportMap.Filter = "JPGE 文件(*.jpg)|*.jpg|BMP 文件(*.bmp)|*.bmp|GIF 文件(*.gif)|*.gif|TIF 文件(*.tif)|*.tif|PNG 文件(*.png)|*.png|PDF 文件(*.pdf)|*.pdf"; 94 sfdExportMap.OverwritePrompt = true;//重复写入时提示错误 95 sfdExportMap.Title = "保存为"; 96 txtExPath.Text = ""; 97 if (sfdExportMap.ShowDialog() != DialogResult.Cancel) 98 { 99 pSavePath = sfdExportMap.FileName;100 txtExPath.Text = sfdExportMap.FileName;101 }102 }103 #endregion104 #region 导出按钮单击事件105 private void btnExPort_Click(object sender, EventArgs e)106 {107 if (txtExPath.Text == "")108 {109 MessageBox.Show("请先确定导出路径！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);110 return;111 }112 else if (cboResoultion.Text == "")113 {114 if (txtExPath.Text == "")115 {116 MessageBox.Show("请输入分辨率！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);117 return;118 }119 }120 else if (Convert.ToInt16(cboResoultion.Text) == 0)121 {122 MessageBox.Show("请正确输入分辨率！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);123 return;124 }125 else126 {127 try128 {129 int resoultion = int.Parse(cboResoultion.Text);//输出图片的分辨率130 int width = int.Parse(cboResoultion.Text);//输出图片的宽度131 int height = int.Parse(cboResoultion.Text);//输出图片的高度132 ExportMap.ExportView(pActiveView, pGeometry, resoultion, width, height, pSavePath, bRegion);133 pActiveView.GraphicsContainer.DeleteAllElements();134 pActiveView.Refresh();135 MessageBox.Show("导出成功！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);136 }137 catch (Exception)138 {139 MessageBox.Show("导出失败！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);140 }141 }142 }143 #endregion144 #region 取消按钮的单击事件145 private void btnCancel_Click(object sender, EventArgs e)146 {147 //局部导出时没有导出图像就退出148 pActiveView.GraphicsContainer.DeleteAllElements();149 pActiveView.Refresh();150 Dispose();151 }152 #endregion153 #region 图片导出窗口Close事件154 private void ExportMapForm_FormClosed(object sender, FormClosedEventArgs e)155 {156 //局部导出时没有导出图像就关闭157 pActiveView.GraphicsContainer.DeleteAllElements();158 pActiveView.Refresh();159 Dispose();160 161 }162 #endregion
3.在main窗体中进行实例化输出窗体：private ExportMapForm frmExpMap = null;
4.在MainMap Control_OnMouseDown中进行写入case：（只适合区域导出，单击选择边框）
1 #region 地图的区域导出 2 case "ExportRegion": 3 //删除视图中的数据 4 mainMapControl.ActiveView.GraphicsContainer.DeleteAllElements(); 5 mainMapControl.ActiveView.Refresh(); 6 IPolygon pPolygon = DrawPolygon(mainMapControl); 7 if (pPolygon == null) return; 8 ExportMap.AddElement(pPolygon, mainMapControl.ActiveView); 9 if (frmExpMap == null || frmExpMap.IsDisposed)10 {11 frmExpMap = new ExportMapForm(mainMapControl);12 }13 frmExpMap.IsRegion = true;14 frmExpMap.GetGeometry = pPolygon as IGeometry;15 frmExpMap.Show();16 frmExpMap.Activate();17 break;18 #endregion
5.全域导出和区域导出按钮的单击事件代码：
1 #region 地图导出之全域导出 2 private void btnExportMap_ItemClick(object sender, ItemClickEventArgs e) 3 { 4 if (frmExpMap == null || frmExpMap.IsDisposed) 5 { 6 frmExpMap = new ExportMapForm(mainMapControl); 7 } 8 frmExpMap.IsRegion = false; 9 frmExpMap.GetGeometry = mainMapControl.ActiveView.Extent;10 frmExpMap.Show();11 frmExpMap.Activate();12 }13 #endregion14 #region 地图导出之区域导出15 private void btnExportRegionMap_ItemClick(object sender, ItemClickEventArgs e)16 {17 mainMapControl.CurrentTool = null;18 mainMapControl.MousePointer = esriControlsMousePointer.esriPointerCrosshair;19 pMouseOperate = "ExportRegion";20 }21 #endregion
ArcGIS Engine开发之地图导出
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