【转帖】how to get the range of the layout that last zoom to
 

how to get the range of the layout that last zoom to ?
how to get the range of the layout that last zoom to ?
hi
i open a dwg file that have many layout.
in autocad,every layout have a viewport range that store the range of user last zoom to,when i change layout,autocad will zoom to the last viewport range
.
how can i get the viewport range of every layout ?
when i change the layout,i use the code to get the viewport
odgsview *pview=m_pdevice->viewat(0);
odgepoint3d tag=pview->target();
double fieldwidth=pview->fieldwidth();
double fieldheight=pview->fieldheight();
i always get the same viewport.
if i change the code to below
oddblayoutptr playout=pdatabase->findlayoutnamed(pdatabase->findactivelayout(true)).safeopenobject();
oddbobjectid id=playout->activeviewportid();
oddbviewportptr pviewport=id.safeopenobject();
odgepoint3d tag=pviewport->viewtarget();
double fieldwidth=pviewport->width();
double fieldheight=pviewport->height();
id is null,why ?
by the way.
i write a cdwgvectorizedevice inherit from dgsbasevectorizedevice,odgigeometrysimplifier and odrxdispatchimpl<>,
i set the background is black and when i draw a entity which color is the same as background color,i use inverse color to draw it,everything is ok.
when i change the layout to paper space,there is a paper whick color is white ,when i draw a entity which color is black,so i change it's color to white,and draw a white entity to white paper,i can't see the entity again.
how can i avoid it ?
last edited by yashu; 12th november 2004 at 09:56 pmfff">.