OK, all those problems fixed now. Setting the pen color to the interior
color fixed the border, and I had an error in my font size that J6
didn't notice. I will change the Wiki to mention that minimum effective
pen width is 1.
Henry Rich
On 5/31/2013 11:28 PM, bill lam wrote:
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
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