地理信息系统基本功能开发技术介绍课件PPT.ppt

绘制鹰眼矩形框 private void axMapControl2_OnExtentUpdated(object sender, IMapControlEvents2_OnExtentUpdatedEvent e) { IEnvelope pEnvelope = e.newEnvelope as IEnvelope; IGraphicsContainer pGraphicsContainer = this.axMapControl1.Map as IGraphicsContainer; IActiveView pActiveView = pGraphicsContainer as IActiveView; pGraphicsContainer.DeleteAllElements(); IRectangleElement pRectangleElement = new RectangleElementClass(); IElement pElement = pRectangleElement as IElement; pElement.Geometry = pEnvelope; IRgbColor pColor = new RgbColorClass(); pColor.RGB = 255; pColor.Transparency = 30; ILineSymbol pLineSymbol = new SimpleLineSymbolClass(); pLineSymbol.Width = 1; pLineSymbol.Color = pColor; pColor = new RgbColorClass(); pColor.RGB = 255; pColor.Transparency = 0; IFillSymbol pFillSymbol = new SimpleFillSymbolClass(); pFillSymbol.Color = pColor; pFillSymbol.Outline = pLineSymbol; IFillShapeElement pFillShapeElement = pElement as IFillShapeElement; pFillShapeElement.Symbol = pFillSymbol; pElement = pFillShapeElement as IElement; pGraphicsContainer.AddElement(pElement, 0); pActiveView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, null); } 鹰眼功能的实现 鹰眼与主Map?控件互动 private void axMapControl1_OnMouseDown(object sender, IMapControlEvents2_OnMouseDownEvent e) { if?(this.axMapControl1.Map.LayerCount?!=?0)?? {?? //?按下鼠标左键移动矩形框?? if (e.button == 1) { IPoint pPoint = new PointClass(); pPoint.PutCoords(e.mapX, e.mapY); IEnvelope pEnvelope = this.axMapControl2.Extent; pEnvelope.CenterAt(pPoint); this.axMapControl2.Extent = pEnvelope; this.axMapControl2.Acti