[每日一码] Create Paper Space Viewports

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1. void fCreateViewPort()
2. {
3.   // Only works in paperspace
4.   AcDbObjectId mCurViewportId = acedGetCurViewportObjectId();
7.   if (mCurViewportId == AcDbObjectId::kNull)
8.   {
9.     acutPrintf("\nCommand only works in paperspace.");
10.     return;
11.   }
14.   AcDbViewport *pCurViewport;
15.   if (Acad::eOk != acdbOpenObject(pCurViewport,mCurViewportId,AcDb::kForRead))
16.   {
17.     acutPrintf("\nCannot get active viewport.");
18.     return;
19.   }
22.   if (pCurViewport->number() != 1)
23.   {
24.     acutPrintf("\nCommand only works in paperspace.");
25.     pCurViewport->close();
26.     return;
27.   }
28.   pCurViewport->close();
31.   // Ask for the position
32.   ads采用point pt1,pt2;
35.   if (RTNORM != acedGetPoint(NULL, "\nSelect first corner: ", pt1))
36.     return;
39.   if (RTNORM != acedGetCorner(pt1, "\nSelect second corner: ", pt2))
40.     return;
43.   // Ask for the view to use
44.   char mViewName[133];
47.   if (RTNORM != acedGetString(0, "\nEnter name of view to use: ", mViewName))
48.     return;
52.   // Create new viewport
55.   AcDbViewport *pViewport = new AcDbViewport;
58.   pViewport->setWidth(fabs(pt2[X] - pt1[X]));
59.   pViewport->setHeight(fabs(pt2[Y] - pt1[Y]));
60.   pViewport->setCenterPoint(AcGePoint3d(pt1[X] + (pt2[X] - pt1[X]) / 2,
61.       pt1[Y] + (pt2[Y] - pt1[Y]) / 2,
62.       pt1[Z]));
65.   // Append new viewport to paper space
66.   AcDbBlockTable *pTable;
67.   AcDbBlockTableRecord *pPsBTR;
70.   if (Acad::eOk != acdbHostApplicationServices()->workingDatabase()->getBlockTable(pTable, AcDb::kForRead))
71.   {
72.     acutPrintf("\nCannot get block table.");
73.     delete pViewport;
74.     return;
75.   }
78.   if (Acad::eOk != pTable->getAt(ACDB采用PAPER采用SPACE, pPsBTR, AcDb::kForWrite))
79.   {
80.     acutPrintf("\nCannot access paper space.");
81.     pTable->close();
82.     delete pViewport;
83.     return;
84.   }
85.   pTable->close();
88.   AcDbObjectId mViewPortId;
89.   if (Acad::eOk != pPsBTR->appendAcDbEntity(mViewPortId, pViewport))
90.   {
91.     acutPrintf("\nCannot append viewport to paper space.");
92.     pPsBTR->close();
93.     delete pViewport;
94.     return;
95.   }
98.   pPsBTR->close();
101.   pViewport->setOn();
104.   // Set the view
105.   AcDbViewTable *pViewTable;
106.   AcDbViewTableRecord *pViewTR;
108.   if (Acad::eOk != acdbHostApplicationServices()->workingDatabase()->getViewTable(pViewTable, AcDb::kForRead))
109.   {
110.     acutPrintf("\nCannot get view table.");
111.     pViewport->close();
112.     return;
113.   }
115.   if (Acad::eOk != pViewTable->getAt(mViewName, pViewTR, AcDb::kForRead))
116.   {
117.     acutPrintf("\nCannot access view '%s'.", mViewName);
118.     pViewport->close();
119.     pViewTable->close();
120.     return;
121.   }
122.   pViewTable->close();
124.   if (acedSetCurrentView(pViewTR, pViewport)!=Acad::eOk)
125.    acutPrintf("\nFailed to set view");
127.   // Close the objects
128.   pViewTR->close();
129.   pViewport->close();
130. }

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