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：

class ExportMap
{
#region 输出视图
public static void ExportView(IActiveView view, IGeometry pGeo, int Outputresoultion, int Width, int Height, string ExpPath, bool bRegion)
{
IExport pExport = null;
tagRECT exportrect = new tagRECT();
IEnvelope pEnvelop = pGeo.Envelope;
string sType = System.IO.Path.GetExtension(ExpPath);
switch (sType)
{
case ".jpg":
pExport = new ExportJPEGClass();
break;
case ".bmp":
pExport = new ExportBMPClass();
break;
case ".gif":
pExport = new ExportGIFClass();
break;
case ".tif":
pExport = new ExportTIFFClass();
break;
case ".png":
pExport = new ExportPNGClass();
break;
case ".pdf":
pExport = new ExportPDFClass();
break;
default:
MessageBox.Show("没有输出格式，默认JPEG");
pExport = new ExportJPEGClass();
break;
}
pExport.ExportFileName = ExpPath;
exportrect.left = 0;
exportrect.top = 0;
exportrect.right = Width;
exportrect.bottom = Height;
if (bRegion)
{
view.GraphicsContainer.DeleteAllElements();
view.Refresh();
}
IEnvelope envelop = new EnvelopeClass();
envelop.PutCoords((double)exportrect.left, (double)exportrect.top, (double)exportrect.right, (double)exportrect.bottom);
pExport.PixelBounds = envelop;
view.Output(pExport.StartExporting(), Outputresoultion, ref exportrect, pEnvelop, null);
pExport.FinishExporting();
pExport.Cleanup();
}
#endregion
#region 获取RGB颜色
private static  IRgbColor GetRgbColor(int intR,int intG,int intB)
{
IRgbColor pRgbColor=null;
if(intR<0||intR>255||intG<0||intG>255||intB<0||intB>255)
{
return pRgbColor;
}
pRgbColor=new RgbColorClass();
pRgbColor.Red=intR;
pRgbColor.Green=intG;
pRgbColor.Blue=intB;
return pRgbColor;
}
#endregion
#region 创建图形元素
/// <summary>
///
/// </summary>
/// <param name="pGeomentry">几何图形</param>
/// <param name="lineColor">边框颜色</param>
/// <param name="fillColor">填充颜色</param>
/// <returns></returns>
public static IElement CreateElement(IGeometry pGeomentry, IRgbColor lineColor, IRgbColor fillColor)
{
if (pGeomentry == null || lineColor == null || fillColor == null)
{
return null;
}
IElement pElem = null;
try
{
if (pGeomentry is IEnvelope)

pElem = new RectangleElementClass();
else if (pGeomentry is IPolygon)
pElem = new PolygonElementClass();
else if (pGeomentry is ICircularArc)
{
ISegment pSegCircle = pGeomentry as ISegment;
ISegmentCollection pSegColl = new PolygonClass();
object o = Type.Missing;
pSegColl.AddSegment(pSegCircle, ref o, ref o);
IPolygon pPolygon = pSegCircle as IPolygon;
pGeomentry = pPolygon as IGeometry;
pElem = new CircleElementClass();
}
else if (pGeomentry is IPolyline)
pElem = new LineElementClass();
if (pElem == null)
return null;
pElem.Geometry = pGeomentry;
IFillShapeElement pFElem = pElem as IFillShapeElement;
ISimpleFillSymbol pSymbol = new SimpleFillSymbolClass();
pSymbol.Color=fillColor ;
pSymbol.Outline.Color=lineColor;
pSymbol.Style = esriSimpleFillStyle.esriSFSCross;//图形元素的样式
if (pSymbol == null)
{
return null;
}
pFElem.Symbol = pSymbol;
}
catch(Exception ex)
{
MessageBox.Show(ex.Message );
}
return pElem;
}
#endregion
#region 视图窗口绘制几何图形元素
/// <summary>
///
/// </summary>
/// <param name="pGeometry">几何图形</param>
/// <param name="activeView">活动视图</param>
public static void AddElement(IGeometry pGeometry,IActiveView activeView)
{
IRgbColor fillColor=GetRgbColor(204,175,235);
IRgbColor lineColor=GetRgbColor(0,0,0);
IElement pEle=CreateElement(pGeometry,lineColor,fillColor );//调用图形元素的函数
IGraphicsContainer pGC = activeView.GraphicsContainer;
if (pGC != null)
{
pGC.AddElement(pEle, 0);
activeView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, pEle, null);
}
}
#endregion
#region 全域导出
/// <summary>
/// 全域导出
/// </summary>
/// <param name="OutputResolution">输出分辨率</param>
/// <param name="ExpPath">输出路径</param>
/// <param name="view">视图</param>
public static void ExportActiveView(int OutputResolution, string ExpPath, IActiveView view)
{
IExport pExport = null;
tagRECT exportRect;
IEnvelope envelop2 = view.Extent;
int num = (int)Math.Round(view.ScreenDisplay.DisplayTransformation.Resolution);
string sType = System.IO.Path.GetExtension(ExpPath);
switch (sType)
{
case ".jgp":
pExport = new ExportJPEGClass();
break;
case ".bmp":
pExport = new ExportBMPClass();
break;
case ".gif":
pExport = new ExportGIFClass();
break;
case ".tif":
pExport = new ExportTIFFClass();
break;
case ".png":
pExport = new ExportPNGClass();
break;
case ".pdf":
pExport = new ExportPDFClass();
break;
default: MessageBox.Show("No Export Foemat,the default format is JPEG!");
pExport = new ExportJPEGClass();
break;
}
pExport.ExportFileName = ExpPath;
exportRect.left = 0; exportRect.top = 0;
exportRect.right = (int)Math.Round((double)(view.ExportFrame.right * (((double)OutputResolution) / ((double)num))));
exportRect.bottom = (int)Math.Round((double)(view.ExportFrame.bottom * (((double)OutputResolution) / ((double)num))));
IEnvelope envelop = new EnvelopeClass();
envelop.PutCoords((double)exportRect.left, (double)exportRect.top, (double)exportRect.right, (double)exportRect.bottom);
pExport.PixelBounds = envelop;
view.Output(pExport.StartExporting(), OutputResolution, ref exportRect, envelop2, null);
pExport.FinishExporting();
pExport.Cleanup();
}
#endregion
#region  区域导出
/// <summary>
/// 区域导出
/// </summary>
/// <param name="pGeo">输出的图形</param>
/// <param name="OutputResolution">输出的范围</param>
/// <param name="ExpPath">输出路径</param>
/// <param name="view">视图</param>
public static void ExportRegion(IGeometry pGeo, int OutputResolution, string ExpPath, IActiveView view)
{
IExport export = null;
IWorldFileSettings setting = null;
IEnvelope envelope2 = pGeo.Envelope;
string str = ExpPath.Substring(ExpPath.Length - 3, 3).ToUpper();
switch (str)
{
case "JPG":
setting = new ExportJPEGClass();
export = new ExportJPEGClass();
setting = export as IWorldFileSettings;
setting.MapExtent = envelope2;
setting.OutputWorldFile = false;
break;
case "BMP":
setting = new ExportBMPClass();
export = new ExportBMPClass();
setting = export as IWorldFileSettings;
setting.MapExtent = envelope2;
setting.OutputWorldFile = false;
break;
case "TIF":
setting = new ExportTIFFClass();
export = new ExportTIFFClass();
setting = export as IWorldFileSettings;
setting.MapExtent = envelope2;
setting.OutputWorldFile = false;
break;
case "PNG":
setting = new ExportPNGClass();
export = new ExportPNGClass();
setting = export as IWorldFileSettings;
setting.MapExtent = envelope2;
setting.OutputWorldFile = false;
break;
default: break;
}
if (setting == null)
{
export.ExportFileName = ExpPath;
int num = (int)Math.Round(view.ScreenDisplay.DisplayTransformation.Resolution);
tagRECT grect2 = new tagRECT();//实例化矩形
IEnvelope envelop3 = new EnvelopeClass();
view.ScreenDisplay.DisplayTransformation.TransformRect(envelope2, ref grect2, 9);
grect2.left = 0;
grect2.top = 0;
grect2.right = (int)Math.Round((double)(grect2.right - grect2.left) * (((double)OutputResolution) / ((double)num)));
grect2.bottom = (int)Math.Round((double)((grect2.bottom - grect2.top) * (((double)OutputResolution) / ((double)num))));
envelop3.PutCoords((double)grect2.left, (double)grect2.top, (double)grect2.right, (double)grect2.bottom);
export.PixelBounds = envelop3;
view.GraphicsContainer.DeleteAllElements();
view.Output(export.StartExporting(), OutputResolution, ref grect2, envelope2, null);
export.FinishExporting();
export.Cleanup();
AddElement(pGeo, view);
}

}
#endregion
}

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。

public partial class ExportMapForm : DevExpress.XtraEditors.XtraForm
{
//定义全局变量
private string pSavePath = "";
private IActiveView pActiveView;
private IGeometry pGeometry = null;
#region 只读属性，地图导出空间图形
public IGeometry GetGeometry
{
set { pGeometry = value; }
}
private bool bRegion = true;
#endregion
/// <summary>
/// 只读属性，是全域导出还是区域导出
/// </summary>
public bool IsRegion
{
set { bRegion = value; }
}

//获取主窗口的MapControl控件
public ExportMapForm(AxMapControl mainAxMapControl)
{
InitializeComponent();

pActiveView = mainAxMapControl.ActiveView;

}

private void ExportMapForm_Load(object sender, EventArgs e)
{

}
#region 输入窗口的大小
private void InitFormSize()
{
cboResoultion.Text = pActiveView.ScreenDisplay.DisplayTransformation.Resolution.ToString();
cboResoultion.Items.Add(cboResoultion.Text);
if (bRegion)
{
IEnvelope pEnvelop = pGeometry.Envelope;
tagRECT pRECT = new tagRECT();
pActiveView.ScreenDisplay.DisplayTransformation.TransformRect(pEnvelop, ref pRECT,15);
if (cboResoultion.Text != "")
{
txtWidth.Text = pRECT.right.ToString();
txtHeight.Text = pRECT.bottom.ToString();
}
}
else
{
if (cboResoultion.Text != "")
{
txtWidth.Text = pActiveView.ExportFrame.right.ToString();
txtHeight.Text = pActiveView.ExportFrame.bottom.ToString();
}
}
}
#endregion
#region combox的ChangeIndex事件
private void cboResoultion_SelectedIndexChanged(object sender, EventArgs e)
{
double num = (int)Math.Round(pActiveView.ScreenDisplay.DisplayTransformation.Resolution);
if (cboResoultion.Text == "")
{
txtWidth.Text = "";
txtHeight.Text = "";
return;
}
if (bRegion)
{
IEnvelope pEnvelop = pGeometry.Envelope;
tagRECT pRECT = new tagRECT();
pActiveView.ScreenDisplay.DisplayTransformation.TransformRect(pEnvelop, ref pRECT,15);
if (cboResoultion.Text != "")
{
txtWidth.Text = Math.Round((double)(pRECT.right * (double.Parse(cboResoultion.Text) / (double)num))).ToString();
}
}
else
{
txtWidth.Text = Math.Round((double)(pActiveView.ExportFrame.right * (double.Parse(cboResoultion.Text) / (double)num))).ToString();
txtHeight.Text = Math.Round((double)(pActiveView.ExportFrame.bottom * (double.Parse(cboResoultion.Text) / (double)num))).ToString();
}
}
#endregion
#region 保存按钮的单击事件
private void btnExPath_Click(object sender, EventArgs e)
{
SaveFileDialog sfdExportMap = new SaveFileDialog();
sfdExportMap.DefaultExt = "jpg|bmp|gif|tif|png|pdf";
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";
sfdExportMap.OverwritePrompt = true;//重复写入时提示错误
sfdExportMap.Title = "保存为";
txtExPath.Text = "";
if (sfdExportMap.ShowDialog() != DialogResult.Cancel)
{
pSavePath = sfdExportMap.FileName;
txtExPath.Text = sfdExportMap.FileName;
}
}
#endregion
#region 导出按钮单击事件
private void btnExPort_Click(object sender, EventArgs e)
{
if (txtExPath.Text == "")
{
MessageBox.Show("请先确定导出路径！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
return;
}
else if (cboResoultion.Text == "")
{
if (txtExPath.Text == "")
{
MessageBox.Show("请输入分辨率！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
return;
}
}
else if (Convert.ToInt16(cboResoultion.Text) == 0)
{
MessageBox.Show("请正确输入分辨率！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
return;
}
else
{
try
{
int resoultion = int.Parse(cboResoultion.Text);//输出图片的分辨率
int width = int.Parse(cboResoultion.Text);//输出图片的宽度
int height = int.Parse(cboResoultion.Text);//输出图片的高度
ExportMap.ExportView(pActiveView, pGeometry, resoultion, width, height, pSavePath, bRegion);
pActiveView.GraphicsContainer.DeleteAllElements();
pActiveView.Refresh();
MessageBox.Show("导出成功！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
catch (Exception)
{
MessageBox.Show("导出失败！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
}
#endregion
#region 取消按钮的单击事件
private void btnCancel_Click(object sender, EventArgs e)
{
//局部导出时没有导出图像就退出
pActiveView.GraphicsContainer.DeleteAllElements();
pActiveView.Refresh();
Dispose();
}
#endregion
#region 图片导出窗口Close事件
private void ExportMapForm_FormClosed(object sender, FormClosedEventArgs e)
{
//局部导出时没有导出图像就关闭
pActiveView.GraphicsContainer.DeleteAllElements();
pActiveView.Refresh();
Dispose();

}
#endregion

View Code
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）

#region 地图的区域导出
case "ExportRegion":
//删除视图中的数据
mainMapControl.ActiveView.GraphicsContainer.DeleteAllElements();
mainMapControl.ActiveView.Refresh();
IPolygon pPolygon = DrawPolygon(mainMapControl);
if (pPolygon == null) return;
ExportMap.AddElement(pPolygon, mainMapControl.ActiveView);
if (frmExpMap == null || frmExpMap.IsDisposed)
{
frmExpMap = new ExportMapForm(mainMapControl);
}
frmExpMap.IsRegion = true;
frmExpMap.GetGeometry = pPolygon as IGeometry;
frmExpMap.Show();
frmExpMap.Activate();
break;
#endregion

5.全域导出和区域导出按钮的单击事件代码：

#region 地图导出之全域导出
private void btnExportMap_ItemClick(object sender, ItemClickEventArgs e)
{
if (frmExpMap == null || frmExpMap.IsDisposed)
{
frmExpMap = new ExportMapForm(mainMapControl);
}
frmExpMap.IsRegion = false;
frmExpMap.GetGeometry = mainMapControl.ActiveView.Extent;
frmExpMap.Show();
frmExpMap.Activate();
}
#endregion
#region 地图导出之区域导出
private void btnExportRegionMap_ItemClick(object sender, ItemClickEventArgs e)
{
mainMapControl.CurrentTool = null;
mainMapControl.MousePointer = esriControlsMousePointer.esriPointerCrosshair;
pMouseOperate = "ExportRegion";
}
#endregion