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已知若干点的经纬度坐标,要求在地图中进行定位:
1.通过Tool 》Add X Y data 定位点,注意选择地理坐标系下的wgs 1984坐标系;
2.定位后的点不能执行查询、分析等操作,需要重新export data;
3.导出的数据最好转换成投影坐标,以便于计算。可首先把已知投影坐标的图层加载到地图中,然后加入第二步产生的点图层,然后将点图层export data,注意坐标系统选择“the data frame”
private void axMapControl1_OnMouseDown(object sender, IMapControlEvents2_OnMouseDownEvent e) { if (i >= 3)//测试目的 return; i++; ITextElement te = createTextElement(e.mapX,e.mapY,"魁x"); axMapControl1.ActiveView.GraphicsContainer.AddElement(te as IElement, 1); axMapControl1.Refresh(esriViewDrawPhase.esriViewGraphics, null, null); } int i; public IBalloonCallout createBalloonCallout(double x, double y) { IRgbColor rgb = new RgbColorClass(); { rgb.Red = 255; rgb.Green = 255; rgb.Blue = 200; } ISimpleFillSymbol sfs = new SimpleFillSymbolClass(); { sfs.Color = rgb; sfs.Style = esriSimpleFillStyle.esriSFSSolid; } IPoint p = new PointClass(); { p.PutCoords(x, y); } IBalloonCallout bc = new BalloonCalloutClass(); { bc.Style = esriBalloonCalloutStyle.esriBCSRoundedRectangle; // bc.Symbol = sfs; // bc.LeaderTolerance = 10; //1 bc.AnchorPoint = p; } return bc; } public ITextElement createTextElement(double x, double y, string text) { IBalloonCallout bc = createBalloonCallout(x, y); IRgbColor rgb = new RgbColorClass(); { //rgb.Red = 255; rgb.Green = 255; } ITextSymbol ts = new TextSymbolClass(); { ts.Color = rgb; } IFormattedTextSymbol fts = ts as IFormattedTextSymbol; { fts.Background = bc as ITextBackground; } //fts.Size = 8; ts.Size = 8; IPoint point = new PointClass(); { double width = axMapControl1.Extent.Width / 13; double height = axMapControl1.Extent.Height / 20; point.PutCoords(x + width, y + height); } ITextElement te = new TextElementClass(); //IMarkerElement me = new MarkerElementClass(); { te.Symbol = ts; //ts.Text = text; te.Text = text; } IElement e = te as IElement; { e.Geometry = point; } return te; } }
有多种方法:
1.使用TextElement
2.使用Label属性或与lyr文件或mxd文件结合进行标注
3.使用AnnotateLayerPropertiesCollection对象进行复杂标注
其中,第二种方法的代码为:
private void AddLabel2Map(string strField) { IGeoFeatureLayer pGeoFeatureLayer; ILineLabelPosition pLineLabelPosition; ILabelEngineLayerProperties pLabelEngineLayerProperties; IAnnotateLayerProperties pAnnotateLayerProperties; pGeoFeatureLayer = (IGeoFeatureLayer)pMapControl.get_Layer(0); pGeoFeatureLayer.AnnotationProperties.Clear(); pLineLabelPosition = new LineLabelPositionClass(); pLineLabelPosition.Above = false; pLineLabelPosition.AtEnd = false; pLineLabelPosition.Below = false; pLineLabelPosition.Horizontal = false; pLineLabelPosition.InLine = true; pLineLabelPosition.OnTop = true; pLineLabelPosition.Parallel = true; pLineLabelPosition.ProduceCurvedLabels = true; pLabelEngineLayerProperties = new LabelEngineLayerPropertiesClass(); pLabelEngineLayerProperties.Symbol = new TextSymbolClass(); pLabelEngineLayerProperties.IsExpressionSimple = true; pLabelEngineLayerProperties.Expression = "[" + strField + "]";//需要中括号 pLabelEngineLayerProperties.BasicOverposterLayerProperties.LineLabelPosition = pLineLabelPosition; pAnnotateLayerProperties = (IAnnotateLayerProperties)pLabelEngineLayerProperties; pAnnotateLayerProperties.DisplayAnnotation = true; pAnnotateLayerProperties.FeatureLayer = pGeoFeatureLayer; pAnnotateLayerProperties.LabelWhichFeatures = esriLabelWhichFeatures.esriAllFeatures; pAnnotateLayerProperties.WhereClause = ""; pGeoFeatureLayer.AnnotationProperties.Add(pAnnotateLayerProperties); pGeoFeatureLayer.DisplayAnnotation = true; pMapControl.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, null); }
这种方法的一个简化是,在ArcMap中事先设定好图层标记的属性,保存为mxd或lyr文件,程序中只使用
pGeoFeatureLayer.DisplayAnnotation和pGeoFeatureLayer.DisplayField设定显示的字段以及是否显示。
在ArcMap中设定的一些细节为:
1.设定标记是否重复、是否每个图元一个标记、或每个图元的每一部分都有一个标记,如图:
2.如何设定label只保留两位小数,如图:
还可以设置其他更为丰富的格式。
参考文章
1. 风过 无痕.arcEngine经典代码-添加气泡提示框(标注,文本,). 2008-8.
2. 丛晓男. 在地图中添加label以标注地图. 2010-6.
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原文地址:http://www.cnblogs.com/arxive/p/5882869.html