ArcEngine鹰眼的实现
2009-11-10 20:30:10 来源：WEB开发网 闂傚倸鍊搁崐鎼佸磹閹间礁纾归柟闂寸绾剧懓顪冪€ｎ亜顒㈡い鎰Г閹便劌顫滈崱妤€骞婄紓鍌氬€瑰銊╁箟缁嬫鍚嬮柛顐線缂冩洟姊婚崒娆戭槮婵犫偓闁秵鎯為幖娣妼缁愭鏌″搴′簽濞戞挸绉甸妵鍕冀椤愵澀娌梺缁樻尪閸庣敻寮婚敐澶婂嵆闁绘劖绁撮崑鎾诲捶椤撴稑浜炬慨妯煎亾鐎氾拷
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大家都用过百度地图或者google地图吧，在它们主地图的右下角，有个小地图窗口，这就是鹰眼窗口。用鼠标拖动鹰眼里的小窗口，则主地图便移动到相应的位置。下面就介绍鹰眼的实现。
鹰眼和主地图的互动，主要体现在两个方面：一是主地图的地图改变了，则鹰眼里的矩形框要移动到对应的位置，以指示当前地图在整个地图中的位置；二是鹰眼的矩形框移动了，则主地图中显示的地图要移动到相应的位置。
ArcEngine中显示地图的控件叫 ESRI MapControl，这里主要用到了它的OnAfterDraw事件。在主地图的OnAfterDrawMapControl事件中，根据当前地图的大小，改变鹰眼中矩形框的大小；在鹰眼的OnAfterDraw事件中，根据矩形框的位置，确定主地图中地图的位置。google地图的鹰眼还实现了矩形框的拖动，这个也很好实现，呵呵。在鼠标点击到鹰眼控件时，先判断是否在矩形框内，如果在的话，用一个状态量记住这个状态，此时如果鼠标移动，则矩形框跟着相应的移动；若不在矩形框内，则矩形框移动到鼠标点击的位置。下面的代码是基于VC6和ArcEngine9.2实现的。鹰眼矩形框的拖动涉及到的事件比较多，包括OnMouseDownMapControl、OnMouseMoveMapControl、OnMouseUpMapControl事件。
1
2 class CEagleEyeCtrl : public CStatic
3 {
4 // Construction
5 public:
6 CEagleEyeCtrl();
7 CMapControlDefault m_MapCtrl;
8 IFillShapeElementPtr m_ipFillShapeElement;
9 IEnvelopePtr m_ipLastEnvelope;
10 IPointPtr m_ipPoint;
11 int m_nAction;
12 BOOL m_bDrag; // 红框拖动的标记
13 BOOL m_bDragWnd; // 拖动整个鹰眼窗口
14 BOOL m_bShow;
15 CPoint m_point; // 鼠标上一次左键按下的屏幕坐标
16 afx_msg void OnMouseDownMapcontrol(long button, long shift, long X, long Y, double mapX, double mapY);
17 afx_msg void OnMouseMoveMapcontrol(long button, long shift, long X, long Y, double mapX, double mapY);
18 afx_msg void OnMouseUpMapcontrol(long button, long shift, long X, long Y, double mapX, double mapY);
19 afx_msg void OnAfterDrawMapcontrol(const VARIANT FAR& Display, long viewDrawPhase);
20 DECLARE_EVENTSINK_MAP()
21 DECLARE_MESSAGE_MAP()
22 };
23
24 void CEagleEyeCtrl::OnMouseDownMapcontrol(long button, long shift, long X,
25 long Y, double mapX, double mapY)
26{
27 // TODO: Add your control notification handler code here
28 IActiveViewPtr ipActiveView;
29 ipActiveView = m_MapCtrl.GetActiveView();
30 if (ipActiveView == NULL)
31 {
32 return ;
33 }
34
35 IPointPtr ipPoint(CLSID_Point);
36 IRgbColorPtr ipRgbColor(CLSID_RgbColor);
37
38 HRESULT hr = ipPoint->PutCoords(mapX, mapY);
39 hr = ipRgbColor->put_RGB((OLE_COLOR)RGB(255, 0, 0));
40 ASSERT(SUCCEEDED(hr));
41
42 IGraphicsContainerPtr ipGraphicsContainer;
43 ipActiveView->get_GraphicsContainer(&ipGraphicsContainer);
44
45 // 添加矩形
46 IEnvelopePtr ipEnvelope(CLSID_Envelope);
47 ipEnvelope->put_XMax(mapX + 0.0005);
48 ipEnvelope->put_XMin(mapX - 0.0005);
49 ipEnvelope->put_YMax(mapY + 0.0003);
50 ipEnvelope->put_YMin(mapY - 0.0003);
51 IRectangleElementPtr ipRectangleElement(CLSID_RectangleElement);
52 ISimpleFillSymbolPtr ipSimpleFillSymbol(CLSID_SimpleFillSymbol);
53 ISimpleLineSymbolPtr ipSimpleLineSymbol(CLSID_SimpleLineSymbol);
54 ipSimpleFillSymbol->put_Style(esriSFSHollow);
55 ipSimpleLineSymbol->put_Color(ipRgbColor);
56 ipSimpleLineSymbol->put_Style(esriSLSSolid);
57 ipSimpleLineSymbol->put_Width(1.8);
58 ipSimpleFillSymbol->put_Outline(ipSimpleLineSymbol);
59
60 IElementPtr ipElement = ipRectangleElement;
61 ipElement->put_Geometry(ipEnvelope);
62 if (m_ipFillShapeElement != NULL)
63 {
64 IElementPtr ipTempElement = m_ipFillShapeElement;
65 IGeometryPtr ipGeometry = NULL;
66 ipTempElement->get_Geometry(&ipGeometry);
67 esriGeometryType esriType = esriGeometryNull;
68 ipGeometry->get_GeometryType(&esriType);
69 ASSERT(esriType == esriGeometryPolygon);
70 IEnvelopePtr ipEnvelope2 = NULL;
71 IPolygonPtr ipPolygon = ipGeometry;
72 hr = ipPolygon->get_Envelope(&ipEnvelope2);
73 ASSERT(ipEnvelope2 != NULL);
74 double xMin = 0.0;
75 double xMax = 0.0;
76 double yMin = 0.0;
77 double yMax = 0.0;
78 ipEnvelope2->QueryCoords(&xMin, &yMin, &xMax, &yMax);
79 if (mapX >= xMin && mapX <= xMax && mapY >= yMin && mapY <= yMax)
80 {
81 m_bDrag = TRUE;
82 }
83 else
84 {
85 m_bDrag = FALSE;
86 }
87 }
88 }
89
90 void CEagleEyeCtrl::OnMouseMoveMapcontrol(long button, long shift, long X,
91 long Y, double mapX, double mapY)
92 {
93 // TODO: Add your control notification handler code here
94 if (m_bDrag)
95 {
96 if (m_ipFillShapeElement != NULL)
97 {
98 IActiveViewPtr ipActiveView = m_MapCtrl.GetActiveView();
99 if (ipActiveView == NULL || m_ipFillShapeElement == NULL)
100 {
101 return;
102 }
103 IGraphicsContainerPtr ipGraphicsContainer = NULL;
104 HRESULT hr = ipActiveView->get_GraphicsContainer(&ipGraphicsContainer);
105 IRgbColorPtr ipRgbColor(CLSID_RgbColor);
106
107 IElementPtr ipElement = m_ipFillShapeElement;
108 IGeometryPtr ipGeometry = NULL;
109 hr = ipElement->get_Geometry(&ipGeometry);
110 esriGeometryType esriType = esriGeometryNull;
111 ipGeometry->get_GeometryType(&esriType);
112 ASSERT(esriType == esriGeometryPolygon);
113 IEnvelopePtr ipEnvelope(CLSID_Envelope);
114 IPolygonPtr ipPolygon = ipGeometry;
115 hr = ipPolygon->get_Envelope(&ipEnvelope);
116
117 IPointPtr ipPoint(CLSID_Point);
118 ipPoint->PutCoords(mapX, mapY);
119 ipEnvelope->CenterAt(ipPoint);
120 m_ipLastEnvelope = ipEnvelope;
121 IEnvelopePtr ipEnvelope2 = m_MapCtrl.GetExtent();
122 ipActiveView->PartialRefresh(esriViewForeground, NULL, ipEnvelope2);
123 }
124 }
125 }
126
127 void CEagleEyeCtrl::OnMouseUpMapcontrol(long button, long shift, long X,
128 long Y, double mapX, double mapY)
129 {
130 // TODO: Add your control notification handler code here
131 m_bDrag = FALSE;
132
133 IActiveViewPtr ipActiveView = m_MapCtrl.GetActiveView();
134 if (ipActiveView == NULL || m_ipFillShapeElement == NULL)
135 {
136 return;
137 }
138 if (m_ipLastEnvelope != NULL)
139 {
140 m_ipLastEnvelope = NULL;
141 }
142 IGraphicsContainerPtr ipGraphicsContainer = NULL;
143 HRESULT hr = ipActiveView->get_GraphicsContainer(&ipGraphicsContainer);
144 IElementPtr ipElement = m_ipFillShapeElement;
145 IGeometryPtr ipGeometry = NULL;
146 ipElement->get_Geometry(&ipGeometry);
147 esriGeometryType esriType;
148 ipGeometry->get_GeometryType(&esriType);
149 ASSERT(esriType == esriGeometryPolygon);
150 IPolygonPtr ipPolygon = ipGeometry;
151 IEnvelopePtr ipEnvelope = NULL;
152 ipPolygon->get_Envelope(&ipEnvelope);
153 IPointPtr ipPoint(CLSID_Point);
154 ipPoint->PutCoords(mapX, mapY);
155 ipEnvelope->CenterAt(ipPoint);
156 ipElement->put_Geometry(ipEnvelope);
157 m_ipFillShapeElement = ipElement;
158 ipGraphicsContainer->UpdateElement((IElementPtr)m_ipFillShapeElement);
159 ipActiveView->Refresh();
160 // 给父控件发消息，切换视图
161 m_ipPoint = ipPoint;
162 GetParent()->GetParent()->SendMessage(WMU_GIS_EAGLE_NOTIFY, 0, 0);
163 }
164
165
166 void CEagleEyeCtrl::OnAfterDrawMapcontrol(const VARIANT FAR& Display,
167 long viewDrawPhase)
168{
169 // TODO: Add your control notification handler code here
170 if (m_ipLastEnvelope != NULL && m_bDrag)
171 {
172 if (m_ipFillShapeElement != NULL)
173 {
174 IActiveViewPtr ipActiveView = m_MapCtrl.GetActiveView();
175 if (ipActiveView == NULL || m_ipFillShapeElement == NULL)
176 {
177 return;
178 }
179
180 IElementPtr ipElement = m_ipFillShapeElement;
181 IGeometryPtr ipGeometry = NULL;
182 ipElement->get_Geometry(&ipGeometry);
183 esriGeometryType esriType = esriGeometryNull;
184 ipGeometry->get_GeometryType(&esriType);
185 ASSERT(esriType == esriGeometryPolygon);
186 IEnvelopePtr ipEnvelope(CLSID_Envelope);
187 IPolygonPtr ipPolygon = ipGeometry;
188 ipPolygon->get_Envelope(&ipEnvelope);
189
190 CPoint pt;
191 GetCursorPos(&pt);
192 m_MapCtrl.ScreenToClient(&pt);
193 IPointPtr ipPoint = m_MapCtrl.ToMapPoint(pt.x, pt.y);
194 ipEnvelope->CenterAt(ipPoint);
195
196 ISimpleFillSymbolPtr ipSimpleFillSymbol(CLSID_SimpleFillSymbol);
197 ISimpleLineSymbolPtr ipSimpleLineSymbol(CLSID_SimpleLineSymbol);
198 IRgbColorPtr ipRgbColor(CLSID_RgbColor);
199 HRESULT hr = ipRgbColor->put_RGB((OLE_COLOR)RGB(255, 0, 0));
200 ASSERT(SUCCEEDED(hr));
201 ipSimpleFillSymbol->put_Style(esriSFSHollow);
202 ipSimpleLineSymbol->put_Color(ipRgbColor);
203 ipSimpleLineSymbol->put_Style(esriSLSSolid);
204 ipSimpleLineSymbol->put_Width(1.8);
205 ipSimpleFillSymbol->put_Outline(ipSimpleLineSymbol);
206
207 IScreenDisplayPtr ipScreenDisplay = NULL;
208 OLE_HANDLE hDC = NULL;
209 hr = ipActiveView->get_ScreenDisplay(&ipScreenDisplay);
210 ASSERT(SUCCEEDED(hr));
211 hr = ipScreenDisplay->get_hDC(&hDC);
212 ASSERT(SUCCEEDED(hr));
213
214 hr = ipScreenDisplay->StartDrawing(hDC, -1);
215 ASSERT(SUCCEEDED(hr));
216 hr = ipScreenDisplay->SetSymbol((ISymbolPtr)ipSimpleFillSymbol);
217 ASSERT(SUCCEEDED(hr));
218 hr = ipScreenDisplay->DrawRectangle(ipEnvelope);
219 ASSERT(SUCCEEDED(hr));
220 hr = ipScreenDisplay->FinishDrawing();
221 }
222 }
223}
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