基于Skyline的TerraExplorer6.1.1如何通过二次开发实现折线和多边形对象的手动绘制

  1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  2 
  3 <html xmlns="http://www.w3.org/1999/xhtml">
  4 <head>
  5     <title></title>
  6     <script type = "text/javascript" language = "javascript">
  7         var gPolyObj = null;
  8         function CreateSGObj() {
  9             var obj = $("sgworld");
 10             if (obj == null) {
 11                 obj = document.createElement('object');
 12                 document.body.appendChild(obj);
 13                 obj.name = "sgworld";
 14                 obj.id = "sgworld";
 15                 obj.classid = "CLSID:3a4f91b0-65a8-11d5-85c1-0001023952c1";
 16             }
 17             return obj;
 18         }
 19         function $(id) {
 20             return window.document.getElementById(id);
 21         }
 22         //********************************************绘制多边形
 23         var gPolylineText = gPolygonText = "Test";
 24         var gDrawPolyClick = null;
 25         
 26         function DrawPolyLButtonDown(Flags, X, Y) {
 27             var SGWorld = CreateSGObj();
 28             var CursorCoord = SGWorld.Window.pixelToWorld(X, Y);
 29             if (CursorCoord == null)
 30                 return false;
 31 
 32             if (gPolyObj == null) {
 33                 // We always start with a polyline and change it to Polygon (for area) after the second click)
 34                 var myGeometry = SGWorld.Creator.GeometryCreator.CreateLineStringGeometry([CursorCoord.Position.x, CursorCoord.Position.y, 0, CursorCoord.Position.x, CursorCoord.Position.y, 0])
 35                 gPolyObj = SGWorld.Creator.createPolyline(myGeometry, SGWorld.Creator.CreateColor(0, 255, 0, 1), 2, 0, gPolylineText);
 36                 gPolyObj.LineStyle.Width = 1;
 37                 gPolyObj.Geometry.StartEdit();
 38 
 39             }
 40             else {
 41                 if (gPolyMethod == 2) // Polygon 
 42                 {
 43                     if (gPolyObj.ObjectType == 1) {
 44                         // Deleting the temporary line
 45                         var x = gPolyObj.Geometry.Points.Item(0).X;
 46                         var y = gPolyObj.Geometry.Points.Item(0).Y;
 47                         SGWorld.Creator.DeleteObject(gPolyObj.ID);
 48 
 49                         // Creating the polygon
 50                         var myGeometry = SGWorld.Creator.GeometryCreator.CreateLinearRingGeometry([x, y, 0, CursorCoord.Position.x, CursorCoord.Position.y, 0, CursorCoord.Position.x, CursorCoord.Position.y, 0])
 51                         gPolyObj = SGWorld.Creator.createPolygon(myGeometry, SGWorld.Creator.CreateColor(0, 255, 0, 1), SGWorld.Creator.CreateColor(0, 255, 0, 0.5), 2, 0, gPolygonText);
 52                         gPolyObj.LineStyle.Width = 1;
 53                         gPolyObj.Terrain.GroundObject = true;
 54                         gPolyObj.Geometry.StartEdit();
 55                     }
 56                     else {
 57                         gPolyObj.Geometry.Rings(0).Points.Item(gPolyObj.Geometry.Rings(0).Points.count - 1).X = CursorCoord.Position.x;
 58                         gPolyObj.Geometry.Rings(0).Points.Item(gPolyObj.Geometry.Rings(0).Points.count - 1).Y = CursorCoord.Position.y;
 59                         gPolyObj.Geometry.Rings(0).Points.Item(gPolyObj.Geometry.Rings(0).Points.count - 1).Z = 0;
 60                         gPolyObj.Geometry.Rings(0).Points.AddPoint(CursorCoord.Position.x, CursorCoord.Position.y, 0);
 61                     }
 62                 }
 63                 else {                    
 64                     gPolyObj.Geometry.Points.Item(gPolyObj.Geometry.Points.count - 1).X = CursorCoord.Position.x;
 65                     gPolyObj.Geometry.Points.Item(gPolyObj.Geometry.Points.count - 1).Y = CursorCoord.Position.y;
 66                     gPolyObj.Geometry.Points.Item(gPolyObj.Geometry.Points.count - 1).Z = 0;
 67                     gPolyObj.Geometry.Points.AddPoint(CursorCoord.Position.x, CursorCoord.Position.y, 0);
 68                 }
 69             }
 70 //            if (gDrawPolyClick != null)
 71 //                gDrawPolyClick(gPolyObj.Geometry, gPolyObj.ObjectType);
 72 //            return true;
 73         }
 74         //-----------
 75         // onFrame
 76         //-----------
 77         function DrawPolyOnFrame() {
 78             var SGWorld = CreateSGObj();
 79             if (gPolyObj != null) {
 80                 try {
 81                     var mouseInfo = SGWorld.Window.GetMouseInfo()
 82                     var CursorCoord = SGWorld.Window.pixelToWorld(mouseInfo.X, mouseInfo.Y);
 83                     if (CursorCoord == null)
 84                         return false;
 85                     if (gPolyObj.ObjectType == 2) {
 86                         gPolyObj.Geometry.Rings(0).Points.Item(gPolyObj.Geometry.Rings(0).Points.count - 1).X = CursorCoord.Position.x;
 87                         gPolyObj.Geometry.Rings(0).Points.Item(gPolyObj.Geometry.Rings(0).Points.count - 1).Y = CursorCoord.Position.y;
 88                         gPolyObj.Geometry.Rings(0).Points.Item(gPolyObj.Geometry.Rings(0).Points.count - 1).Z = 0;
 89                     }
 90                     else {
 91                         gPolyObj.Geometry.Points.Item(gPolyObj.Geometry.Points.count - 1).X = CursorCoord.Position.x;
 92                         gPolyObj.Geometry.Points.Item(gPolyObj.Geometry.Points.count - 1).Y = CursorCoord.Position.y;
 93                         gPolyObj.Geometry.Points.Item(gPolyObj.Geometry.Points.count - 1).Z = 0;
 94                     }
 95                 }
 96                 catch (e) { }
 97             }
 98         }
 99 
100         //-------------
101         //DrawPolyInputModeChanged
102         function DrawPolyInputModeChanged(NewMode) {
103 
104 //            if (NewMode != 1)
105 //                if (gPolyObj != null)
106 //                    Reset(0, 1);
107         }
108         //-------------
109         // DrawPolyRButtonUp
110         function DrawPolyRButtonUp(Flags, X, Y) {
111             var SGWorld = CreateSGObj();            
112             if (gPolyObj == null || ((gPolyObj.ObjectType == 1 && gPolyObj.Geometry.Points.count <= 2) || (gPolyObj.ObjectType == 2 && gPolyObj.Geometry.Rings(0).Points.count <= 3))) {
113 //                Reset(0, 0);
114                 return false;
115             }
116             if (gPolyObj.ObjectType == 1)
117                 gPolyObj.Geometry.Points.DeletePoint(gPolyObj.Geometry.Points.count - 1);
118             else
119                 gPolyObj.Geometry.Rings(0).Points.DeletePoint(gPolyObj.Geometry.Rings(0).Points.count - 1);
120 
121             gPolyObj.Geometry.EndEdit();
122 
123             gPolyObj = null;
124             gPolyMethod = null;
125             return true;
126         }
127 
128         function ExCreate(value) {
129             var SGWorld = CreateSGObj();
130             if (value == 0) {
131                 gPolyMethod = 1;
132                 SGWorld.AttachEvent("OnLButtonDown", DrawPolyLButtonDown);
133                 SGWorld.AttachEvent("OnRButtonUp", DrawPolyRButtonUp);
134                 //SGWorld.AttachEvent("OnFrame", DrawPolyOnFrame);
135             }
136             else if (value == 1)
137             {
138                 gPolyMethod = 2;
139                 SGWorld.AttachEvent("OnLButtonDown", DrawPolyLButtonDown);
140                 SGWorld.AttachEvent("OnRButtonUp", DrawPolyRButtonUp);
141                 //SGWorld.AttachEvent("OnFrame", DrawPolyOnFrame);
142             }
143             else
144             {
145             
146             }
147         }
148     </script>
149 </head>
150 <body>
151     <table>
152         <tr>
153             <td>
154                 <input id="Button1" type="button" value="线Polyline" onclick="ExCreate(0)" />
155             </td>
156         </tr>
157         <tr>
158             <td>
159                 <input id="Button2" type="button" value="多边形Polygon" onclick="ExCreate(1)" />
160             </td>
161         </tr>
162     </table>
163 </body>
164 </html>
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原文地址：https://www.cnblogs.com/yitianhe/p/2877106.html