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 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 #endregion
104 #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 else
126 {
127 try
128 {
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 #endregion
144 #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 #endregion
153 #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 #endregion
14 #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
时间： 2024-10-26 21:07:47