创建图纸空间Viewports

LoveArx

Create ** Space Viewports

Question
How can I create a new viewport in ** space and activate it? I want to let
the user specify a rectangle (like the MVIEW command) and an existing view name.
With this data I want to create a new viewport.
Answer
To create a new viewport in ** space, perform the following steps:

1. Create a new object of type AcDbViewport.
2. Set the view coordinates (with setWidth(), setHeight() and setCenterPoint()).
3. Append the new viewport to the ** space.
4. Get the view the user specified (AcDbViewTableRecord).
5. Set this view on the new viewport with acdbSetCurrentView().
6. Activate the viewport with AcDbViewport::setOn().

NOTE: The AcDbViewport::setOn() function only works if your command has been
registered without the ACRX_CMD_TRANSPARENT flag. If this flag is set,
AcDbViewport::setOn() returns with eCommandWasInProgress and you cannot activate
the viewport until you set tilemode to 1 and back to 0.

The following code demonstrates how to do this:

1. 
   
2. void fCreateViewPort()
   
3. {
   
4.   // Only works in **space
   
5.   AcDbObjectId mCurViewportId = acedGetCurViewportObjectId();
   
6. 
   
7. 
   
8.   if (mCurViewportId == AcDbObjectId::kNull)
   
9.   {
   
10.     acutPrintf("\nCommand only works in **space.");
    
11.     return;
    
12.   }
    
13. 
    
14. 
    
15.   AcDbViewport *pCurViewport;
    
16.   if (Acad::eOk != acdbOpenObject(pCurViewport,mCurViewportId,AcDb::kForRead))
    
17.   {
    
18.     acutPrintf("\nCannot get active viewport.");
    
19.     return;
    
20.   }
    
21. 
    
22. 
    
23.   if (pCurViewport->number() != 1)
    
24.   {
    
25.     acutPrintf("\nCommand only works in **space.");
    
26.     pCurViewport->close();
    
27.     return;
    
28.   }
    
29.   pCurViewport->close();
    
30. 
    
31. 
    
32.   // Ask for the position
    
33.   ads_point pt1,pt2;
    
34. 
    
35. 
    
36.   if (RTNORM != acedGetPoint(NULL, "\nSelect first corner: ", pt1))
    
37.     return;
    
38. 
    
39. 
    
40.   if (RTNORM != acedGetCorner(pt1, "\nSelect second corner: ", pt2))
    
41.     return;
    
42. 
    
43. 
    
44.   // Ask for the view to use
    
45.   char mViewName[133];
    
46. 
    
47. 
    
48.   if (RTNORM != acedGetString(0, "\nEnter name of view to use: ", mViewName))
    
49.     return;
    
50. 
    
51. 
    
52. 
    
53.   // Create new viewport
    
54. 
    
55. 
    
56.   AcDbViewport *pViewport = new AcDbViewport;
    
57. 
    
58. 
    
59.   pViewport->setWidth(fabs(pt2[X] - pt1[X]));
    
60.   pViewport->setHeight(fabs(pt2[Y] - pt1[Y]));
    
61.   pViewport->setCenterPoint(AcGePoint3d(pt1[X] + (pt2[X] - pt1[X]) / 2,
    
62.       pt1[Y] + (pt2[Y] - pt1[Y]) / 2,
    
63.       pt1[Z]));
    
64. 
    
65. 
    
66.   // Append new viewport to ** space
    
67.   AcDbBlockTable *pTable;
    
68.   AcDbBlockTableRecord *pPsBTR;
    
69. 
    
70. 
    
71.   if (Acad::eOk != acdbHostApplicationServices()->workingDatabase()->getBlockTable(pTable, AcDb::kForRead))
    
72.   {
    
73.     acutPrintf("\nCannot get block table.");
    
74.     delete pViewport;
    
75.     return;
    
76.   }
    
77. 
    
78. 
    
79.   if (Acad::eOk != pTable->getAt(ACDB_**_SPACE, pPsBTR, AcDb::kForWrite))
    
80.   {
    
81.     acutPrintf("\nCannot access ** space.");
    
82.     pTable->close();
    
83.     delete pViewport;
    
84.     return;
    
85.   }
    
86.   pTable->close();
    
87. 
    
88. 
    
89.   AcDbObjectId mViewPortId;
    
90.   if (Acad::eOk != pPsBTR->appendAcDbEntity(mViewPortId, pViewport))
    
91.   {
    
92.     acutPrintf("\nCannot append viewport to ** space.");
    
93.     pPsBTR->close();
    
94.     delete pViewport;
    
95.     return;
    
96.   }
    
97. 
    
98. 
    
99.   pPsBTR->close();
    
100. 
     
101. 
     
102.   pViewport->setOn();
     
103. 
     
104. 
     
105.   // Set the view
     
106.   AcDbViewTable *pViewTable;
     
107.   AcDbViewTableRecord *pViewTR;
     
108. 
     
109. 
     
110.   if (Acad::eOk != acdbHostApplicationServices()->workingDatabase()->getViewTable(pViewTable, AcDb::kForRead))
     
111.   {
     
112.     acutPrintf("\nCannot get view table.");
     
113.     pViewport->close();
     
114.     return;
     
115.   }
     
116. 
     
117. 
     
118.   if (Acad::eOk != pViewTable->getAt(mViewName, pViewTR, AcDb::kForRead))
     
119.   {
     
120.     acutPrintf("\nCannot access view '%s'.", mViewName);
     
121.     pViewport->close();
     
122.     pViewTable->close();
     
123.     return;
     
124.   }
     
125.   pViewTable->close();
     
126. 
     
127. 
     
128.   if (acedSetCurrentView(pViewTR, pViewport)!=Acad::eOk)
     
129.    acutPrintf("\nFailed to set view");
     
130. 
     
131. 
     
132. 
     
133.   // Close the objects
     
134.   pViewTR->close();
     
135.   pViewport->close();
     
136. }
     

<br /> void fCreateViewPort()<br /> {<br />   // Only works in **space<br />   AcDbObjectId mCurViewportId = acedGetCurViewportObjectId();<br /> <br /> <br />   if (mCurViewportId == AcDbObjectId::kNull)<br />   {<br />     acutPrintf("\nCommand only works in **space.");<br />     return;<br />   }<br /> <br /> <br />   AcDbViewport *pCurViewport;<br />   if (Acad::eOk != acdbOpenObject(pCurViewport,mCurViewportId,AcDb::kForRead))<br />   {<br />     acutPrintf("\nCannot get active viewport.");<br />     return;<br />   }<br /> <br /> <br />   if (pCurViewport->number() != 1)<br />   {<br />     acutPrintf("\nCommand only works in **space.");<br />     pCurViewport->close();<br />     return;<br />   }<br />   pCurViewport->close();<br /> <br /> <br />   // Ask for the position<br />   ads_point pt1,pt2;<br /> <br /> <br />   if (RTNORM != acedGetPoint(NULL, "\nSelect first corner: ", pt1))<br />     return;<br /> <br /> <br />   if (RTNORM != acedGetCorner(pt1, "\nSelect second corner: ", pt2))<br />     return;<br /> <br /> <br />   // Ask for the view to use<br />   char mViewName[133];<br /> <br /> <br />   if (RTNORM != acedGetString(0, "\nEnter name of view to use: ", mViewName))<br />     return;<br /> <br /> <br /> <br />   // Create new viewport<br /> <br /> <br />   AcDbViewport *pViewport = new AcDbViewport;<br /> <br /> <br />   pViewport->setWidth(fabs(pt2[X] - pt1[X]));<br />   pViewport->setHeight(fabs(pt2[Y] - pt1[Y]));<br />   pViewport->setCenterPoint(AcGePoint3d(pt1[X] + (pt2[X] - pt1[X]) / 2,<br />       pt1[Y] + (pt2[Y] - pt1[Y]) / 2,<br />       pt1[Z]));<br /> <br /> <br />   // Append new viewport to ** space<br />   AcDbBlockTable *pTable;<br />   AcDbBlockTableRecord *pPsBTR;<br /> <br /> <br />   if (Acad::eOk != acdbHostApplicationServices()->workingDatabase()->getBlockTable(pTable, AcDb::kForRead))<br />   {<br />     acutPrintf("\nCannot get block table.");<br />     delete pViewport;<br />     return;<br />   }<br /> <br /> <br />   if (Acad::eOk != pTable->getAt(ACDB_**_SPACE, pPsBTR, AcDb::kForWrite))<br />   {<br />     acutPrintf("\nCannot access ** space.");<br />     pTable->close();<br />     delete pViewport;<br />     return;<br />   }<br />   pTable->close();<br /> <br /> <br />   AcDbObjectId mViewPortId;<br />   if (Acad::eOk != pPsBTR->appendAcDbEntity(mViewPortId, pViewport))<br />   {<br />     acutPrintf("\nCannot append viewport to ** space.");<br />     pPsBTR->close();<br />     delete pViewport;<br />     return;<br />   }<br /> <br /> <br />   pPsBTR->close();<br /> <br /> <br />   pViewport->setOn();<br /> <br /> <br />   // Set the view<br />   AcDbViewTable *pViewTable;<br />   AcDbViewTableRecord *pViewTR;<br /> <br /> <br />   if (Acad::eOk != acdbHostApplicationServices()->workingDatabase()->getViewTable(pViewTable, AcDb::kForRead))<br />   {<br />     acutPrintf("\nCannot get view table.");<br />     pViewport->close();<br />     return;<br />   }<br /> <br /> <br />   if (Acad::eOk != pViewTable->getAt(mViewName, pViewTR, AcDb::kForRead))<br />   {<br />     acutPrintf("\nCannot access view '%s'.", mViewName);<br />     pViewport->close();<br />     pViewTable->close();<br />     return;<br />   }<br />   pViewTable->close();<br /> <br /> <br />   if (acedSetCurrentView(pViewTR, pViewport)!=Acad::eOk)<br />    acutPrintf("\nFailed to set view");<br /> <br /> <br /> <br />   // Close the objects<br />   pViewTR->close();<br />   pViewport->close();<br /> }<br />