创建图纸空间视口
问题：How can I create a new viewport in paper 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.
解答：
To create a new viewport in paper 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 paper 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:
void fCreateViewPort()
{
// Only works in paperspace
AcDbObjectId mCurViewportId = acedGetCurViewportObjectId();
if (mCurViewportId == AcDbObjectId::kNull)
{
acutPrintf("\nCommand only works in paperspace.");
return;
}
AcDbViewport *pCurViewport;
if (Acad::eOk != acdbOpenObject(pCurViewport,mCurViewportId,AcDb::kForRead))
{
acutPrintf("\nCannot get active viewport.");
return;
}
if (pCurViewport->number() != 1)
{
acutPrintf("\nCommand only works in paperspace.");
pCurViewport->close();
return;
}
pCurViewport->close();
// Ask for the position
ads_point pt1,pt2;
if (RTNORM != acedGetPoint(NULL, "\nSelect first corner: ", pt1))
return;
if (RTNORM != acedGetCorner(pt1, "\nSelect second corner: ", pt2))
return;
// Ask for the view to use
char mViewName;
if (RTNORM != acedGetString(0, "\nEnter name of view to use: ", mViewName))
return;
// Create new viewport
AcDbViewport *pViewport = new AcDbViewport;
pViewport->setWidth(fabs(pt2 - pt1));
pViewport->setHeight(fabs(pt2 - pt1));
pViewport->setCenterPoint(AcGePoint3d(pt1 + (pt2 - pt1) / 2,
pt1 + (pt2 - pt1) / 2,
pt1));
// Append new viewport to paper space
AcDbBlockTable *pTable;
AcDbBlockTableRecord *pPsBTR;
if (Acad::eOk != acdbHostApplicationServices()->workingDatabase()->getBlockTable(pTable, AcDb::kForRead))
{
acutPrintf("\nCannot get block table.");
delete pViewport;
return;
}
if (Acad::eOk != pTable->getAt(ACDB_PAPER_SPACE, pPsBTR, AcDb::kForWrite))
{
acutPrintf("\nCannot access paper space.");
pTable->close();
delete pViewport;
return;
}
pTable->close();
AcDbObjectId mViewPortId;
if (Acad::eOk != pPsBTR->appendAcDbEntity(mViewPortId, pViewport))
{
acutPrintf("\nCannot append viewport to paper space.");
pPsBTR->close();
delete pViewport;
return;
}
pPsBTR->close();
pViewport->setOn();
// Set the view
AcDbViewTable *pViewTable;
AcDbViewTableRecord *pViewTR;
if (Acad::eOk != acdbHostApplicationServices()->workingDatabase()->getViewTable(pViewTable, AcDb::kForRead))
{
acutPrintf("\nCannot get view table.");
pViewport->close();
return;
}
if (Acad::eOk != pViewTable->getAt(mViewName, pViewTR, AcDb::kForRead))
{
acutPrintf("\nCannot access view '%s'.", mViewName);
pViewport->close();
pViewTable->close();
return;
}
pViewTable->close();
if (acedSetCurrentView(pViewTR, pViewport)!=Acad::eOk)
acutPrintf("\nFailed to set view");
// Close the objects
pViewTR->close();
pViewport->close();
}
谢谢楼主分享。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。
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