【转帖】printingpreview problems with dwgdirect 2.1.0
 

printing/preview problems with dwgdirect 2.1.0
printing/preview problems with dwgdirect 2.1.0
hi,
i just upgraded from dwgdirect 1.1.4 to dwgdirect 2.1.0 in our program (windows, mfc), without any problem. evrything works like before, except printing:
when previewing, drawing may display properly (but not always) the first time the preview view is displayed. any time the view is refreshed after that (just by displaying another window in front of it), the page is totally white.
in odamfcapp, which has a new cdwgviewer::onprint implementation, the problem is not exactly the same: on previewing, the drawing is almost properly displayed (except some strange lines filled with garbage, on the border of the drawing), even if it takes much, much longer to display (5 seconds, by square blocks) than in normal view (almost instantly). but as soon as i press zoom in/zoom out (and precisely if i do it while the view is being refreshed), i get a kind of tiled view that repeats some square region of the drawing. i even experience that with a very simple drawing (new drawing with 1 line).
it happens consequentely whatever the selected plotter/printer, the scale, the quality, the drawing, ...
using
dwgdirect 2.1.0
pentium 4 3.4 ghz
ram 2 gb
windows xp sp2
visual studio 6.0 sp6
compiling without _unicode,unicode (linking with ansi libs)
regards,
guillaume
hi, this is known defect. i have fixed it already, except garbage at the borders in bitmap mode. fixes will be availabe with next release, but...
preview has two rendering modes - via bitmap and via geometry. bitmap mode creates big slow bitmap, but in this mode you can print viewports with shaded mode (filled spheres and ...). geometry mode is more faster but it cannot print shaded viewports. flag bplotviabmp in cdwgviewer::onprint select print\preview mode.
'click/zoom garbage' can be fixed by
bool cdwgviewer::regenabort() const
{
// to prevent artifacts in preview (in bitmap mode)
if(isplotgeneration())
return false;