I suspect Qt will not allow zero width or height. the pen's zero width was coerced to 1 px and the brush can only draw the interior of rectangle so that the 1px border around a rectangle is not drawn. I guess you can try setting the pen color to be the same of the brush color.
the qextent should work reasonably well, did you set glfont before calling qextent? Пт, 31 май 2013, Henry Rich писал(а): > OK, thanks, will do. > > Meanwhile, a little progress. > > Going back through my code I find that gl2 for J6 required me to add > 1 to wh to make rectangles abut properly. When I remove this kludge > for J8 it fixes the clipping problem. > > It appears that character extents for Arial font are not reported > correctly, which induces me to allocate a wider box for the string > than necessary, which makes things look skewed to the left. This > problem is still active & I will get more info. > > I experimented with adding values to w&h and nothing gets rid of the > lines between abutting rectangles. I am inclining with Bill to curse > the pen. I use pen 0 5, i. e. 0 width, PS_NULL. This problem is > still active. > > Henry Rich > > On 5/31/2013 10:32 PM, bill lam wrote: > >Please look at the section source in > >http://www.jsoftware.com/jwiki/Guides/Qt%20IDE > > > >gl2 is implmemented in the file lib/wd/gl2.cpp > > > >Пт, 31 май 2013, Henry Rich писал(а): > >>You might be right there. The lines between the rects seem to be a > >>darker version of the rectangle color. I have set the pen to null - > >>perhaps that is not being handled properly. > >> > >>Can you point me to the Qt C++ source? > >> > >>Henry Rich > >> > >>On 5/31/2013 10:16 PM, bill lam wrote: > >>>This is the definition of glrect in gl2: > >>> > >>>glrect x y w h ; draw rectangle with pen and brush > >>> > >>>This is its implementation in Qt C++ > >>> > >>>int glrect (const int *p) > >>>{ > >>> if (!isigraph) return 1; > >>> Isigraph2 *w = (Isigraph2 *)isigraph->widget; > >>> if (!w->painter) return 1; > >>> if (!w->painter->isActive()) return 1; > >>> w->painter->drawRect (*(p), *(p + 1), *(p + 2), *(p + 3)); > >>> return 0; > >>>} > >>> > >>>This is from Qt documentation > >>> > >>>void QPainter::drawRect ( int x, int y, int width, int height ) > >>> > >>>This is an overloaded function. > >>> > >>>Draws a rectangle with upper left corner at (x, y) and with the > >>>given width and height. > >>> > >>> > >>>So that I think the current glrect implementation is correct. > >>>The issue you got might be related to pen and brush. > >>> > >>>Пт, 31 май 2013, Henry Rich писал(а): > >>>>OK. > >>>> > >>>>A series of rectangles with the same y values and adjoining in x, > >>>>such that x+w of one = x of the next, do not abut smoothly. > >>>> > >>>>I don't know how Qt describes rectangles: is it xywh or tlbr? But > >>>>somehow the gl2 definition leaves gaps when drawn in Qt. > >>>> > >>>>Henry Rich > >>>> > >>>>On 5/31/2013 7:35 PM, chris burke wrote: > >>>>>In general, we want things to work the way Qt works. That is simplest for > >>>>>us, and the best way forward. > >>>>> > >>>>>If a discrepancy between J6 and J8 arises because of the way we have > >>>>>coded > >>>>>it, then we will fix it, but not if it arises because Qt differs from J6 > >>>>>jwdw or jwdp. > >>>>> > >>>>>On Sat, Jun 1, 2013 at 7:18 AM, Henry Rich <[email protected]> wrote: > >>>>> > >>>>>>Try loading the dissect package (just released) in J6 and J8, and see > >>>>>>the > >>>>>>differences. In particular, look at the sentence display at the top of > >>>>>>the > >>>>>>graphics window - in J8 it shows rectangle boundaries. > >>>>>> > >>>>>>Also, see how the display of shape and rank information (above the > >>>>>>results) seems to be uncentered in the rectangle. > >>>>>> > >>>>>>Also, the Arial font seems to size differently in J8 than in J6. > >>>>>> > >>>>>>Do you agree that the graphics should look the same between J6 and J8? > >>>>>>If > >>>>>>so, I will work on characterizing the differences. > >>>>>> > >>>>>>Remember to upgrade your grid before installing dissect. > >>>>>> > >>>>>>Henry Rich > >>>>>> > >>>>>> > >>>>>>On 5/31/2013 7:10 PM, bill lam wrote: > >>>>>> > >>>>>>>Reactively, I suspect that the way how Qt works. Please > >>>>>>>provide simple script and screen shots to illustrate the > >>>>>>>differences. > >>>>>>> > >>>>>>>Пт, 31 май 2013, Henry Rich писал(а): > >>>>>>> > >>>>>>>>gl2 for J8 has a number of incompatibilities with J6, and also just > >>>>>>>>seems a pixel off in some cases. Since there will be graphics > >>>>>>>>applications used on both J6 and J8 for a while yet, it seems to me > >>>>>>>>that J8 ought to do things the J6 way when there is no reason not to. > >>>>>>>> > >>>>>>>>What I have found so far: > >>>>>>>> > >>>>>>>>0. glarc seems to go CW around the ellipse; J6 went CCW > >>>>>>>> > >>>>>>>>1. drawing abutting rectangles, with the same color and no pen, > >>>>>>>>should leave a smooth field; in J8 there are visible joints > >>>>>>>> > >>>>>>>>2. drawing text inside a box, the text seems to be shifted one pixel > >>>>>>>>to the left. Or maybe the box is one pixel to the right. > >>>>>>>> > >>>>>>>>3. When I draw a box with a pen just inside the wdclip rectangle, > >>>>>>>>the right and bottom are chopped off. In J6 the cliprect was already > >>>>>>>>one row/col too short; j8 is even shorter. This may be related to > >>>>>>>>item 2. > >>>>>>>> > >>>>>>>>This weekend I will release a graphics application for J6 and J8. It > >>>>>>>>formats properly on J6, and exhibits pixel problems on J8. > >>>>>>>> > >>>>>>>>Henry Rich > >>>>>>>>------------------------------**------------------------------** > >>>>>>>>---------- > >>>>>>>>For information about J forums see > >>>>>>>>http://www.jsoftware.com/**forums.htm<http://www.jsoftware.com/forums.htm> > >>>>>>>> > >>>>>>> > >>>>>>> ------------------------------**------------------------------** > >>>>>>---------- > >>>>>>For information about J forums see > >>>>>>http://www.jsoftware.com/**forums.htm<http://www.jsoftware.com/forums.htm> > >>>>>> > >>>>>---------------------------------------------------------------------- > >>>>>For information about J forums see http://www.jsoftware.com/forums.htm > >>>>> > >>>>---------------------------------------------------------------------- > >>>>For information about J forums see http://www.jsoftware.com/forums.htm > >>> > >>---------------------------------------------------------------------- > >>For information about J forums see http://www.jsoftware.com/forums.htm > > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm -- regards, ==================================================== GPG key 1024D/4434BAB3 2008-08-24 gpg --keyserver subkeys.pgp.net --recv-keys 4434BAB3 ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
