基于ArcGIS Base Command模板放大縮小

[地址]http://blog.csdn.net/eof_2011/article/details/8014075

?既能拉框也能點擊放大縮小，原作者寫的非常好收藏了。

基于ESRI.ArcGIS.Controls命名空間

這種esriControlsMousePointer方式實現的放大縮小只能拉框不能點擊

放大

//寫在功能按鈕中
axMapControl1.MousePointer=esriControlsMousePointer.esriPointerZoomIn;
flag= a number //以flag number來判斷 //寫在OnMouseDown之類的事件中 下同
IEnvelope pEnvelope = axMapControl1.TrackRectangle(); axMapControl1.Extent = pEnvelope ;

縮小

axMapControl1.MousePointer = esriControlsMousePointer.esriPointerZoomOut;
pEnvelope = axMapControl1.TrackRectangle(); pEnvelope = axMapControl1.Extent; pEnvelope .Expand(2, 2, true); axMapControl1.Extent = pEnvelope ;

漫游

axMapControl1.MousePointer = esriControlsMousePointer.esriPointerPan;
pEnvelope = axMapControl1.Extent; axMapControl1.Pan();

全局顯示

axMapControl1.Extent = axMapControl1.FullExtent;

Tips：

可以根據flag來if判斷寫何種類型操作之后的代碼

?基于IEnvolope的Expand方法

這種方法只能拉框放大

private void Zoom_Out(AxMapControl map) {var _map = axMapControl1;_map.Extent = _map.FullExtent;IEnvelope pEnvelope = null;pEnvelope = _map.Extent;pEnvelope.Expand(0.5, 0.5, true);_map.Extent = pEnvelope;//_map.MousePointer = esriControlsMousePointer.esriPointerDefault; _map.ActiveView.Refresh();}//ZoomIn放大private void Zoom_In(){IActiveView pAtView = axMapControl1.ActiveView;IPoint centerPoint = new PointClass();centerPoint.PutCoords((pAtView.Extent.XMin + pAtView.Extent.XMax) * 2, (pAtView.Extent.YMax + pAtView.Extent.YMin) * 2);IEnvelope pEnvlope = pAtView.Extent;pEnvlope.Expand(1.5, 1.5, true); 與放大的區別在于參數不同pAtView.Extent.CenterAt(centerPoint);pAtView.Extent = pEnvlope;pAtView.Refresh();}

?基于IEnvolope的Expand方法還有下面寫法。

//這些寫在放大按鈕事件里 Property.axMapControl.CurrentTool = null; pMouseOperate = "ZoomIn"; Property.axMapControl.MousePointer = esriControlsMousePointer.esriPointerZoomIn; //同理 縮小的mainMapControl.CurrentTool = null; pMouseOperate = "ZoomOut"; mainMapControl.MousePointer = esriControlsMousePointer.esriPointerZoomOut;//這些方法axMapControl中鼠標按下事件中 //屏幕坐標點轉化為地圖坐標點 pPointPt = (mainMapControl.Map as IActiveView).ScreenDisplay.DisplayTransformation.ToMapPoint(e.x, e.y);if (e.button == 1) {IActiveView pActiveView = mainMapControl.ActiveView;IEnvelope pEnvelope = new EnvelopeClass();switch (pMouseOperate){#region 拉框放大case "ZoomIn":pEnvelope = mainMapControl.TrackRectangle();//如果拉框范圍為空則返回if (pEnvelope == null || pEnvelope.IsEmpty || pEnvelope.Height == 0 || pEnvelope.Width == 0){return;}//如果有拉框范圍，則放大到拉框范圍pActiveView.Extent = pEnvelope;pActiveView.Refresh();break;#endregion#region 拉框縮小case "ZoomOut":pEnvelope = mainMapControl.TrackRectangle();//如果拉框范圍為空則退出if (pEnvelope == null || pEnvelope.IsEmpty || pEnvelope.Height == 0 || pEnvelope.Width == 0){return;}//如果有拉框范圍，則以拉框范圍為中心，縮小倍數為：當前視圖范圍/拉框范圍else{double dWidth = pActiveView.Extent.Width*pActiveView.Extent.Width/pEnvelope.Width;double dHeight = pActiveView.Extent.Height*pActiveView.Extent.Height/pEnvelope.Height;double dXmin = pActiveView.Extent.XMin -((pEnvelope.XMin - pActiveView.Extent.XMin)*pActiveView.Extent.Width/pEnvelope.Width);double dYmin = pActiveView.Extent.YMin -((pEnvelope.YMin - pActiveView.Extent.YMin)*pActiveView.Extent.Height/pEnvelope.Height);double dXmax = dXmin + dWidth;double dYmax = dYmin + dHeight;pEnvelope.PutCoords(dXmin, dYmin, dXmax, dYmax);}pActiveView.Extent = pEnvelope;pActiveView.Refresh();break;#endregion} }

　　

?

轉載于:https://www.cnblogs.com/marvelousone/p/8039031.html

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