[Gambas-user] print resolution issues

Tue Oct 14 17:08:57 CEST 2014

Yes configure reset many properties

For labels you can use gb.report too. It manage resolutions correctly.
Le 13 oct. 2014 21:26, "Paul Horechuk" <horechuk at ...981...> a écrit :

> It looks like the problem has been resolved. Keeping the same resolution
> (100), I just moved the .resolution to just after the .configure line,
> before the printer.begin. This at least fixes the pdf scaling issue and
> I'm sure it will fix other printer issues as well.
>
> Thanks to Gian and Benoit.
>
> On 14-10-13 02:22 PM, Paul Horechuk wrote:
> > Thank you for the examples.
> >
> > It appears we are doing a similar process. You use 72 as the resolution
> > and with 25.4 mm per inch, you get a factor of 0.352778 (MM_X_PX).
> >
> > I use 100 for the resolution and use the page dimensions of the page in
> > inches to get 850 x 1100 for US letter size. If I change to a res of 72
> > then I should use 1.38889 as my adjustment factor or rather than
> > dividing by the factor, I would multiply by 72/100 or 0.72. I would then
> > use a page size of 8.5 x 72 or 612 wide and length is 792. Each offset
> > is then multiplid by 0.72.
> >
> > As a result of this, my code does write to a pixel scale, just with a
> > different resolution. Significant? Probably not. However, your code does
> > print OK to a .pdf. Strange.
> >
> > On 14-10-10 06:04 PM, Gian wrote:
> >> Sorry but for my scarce English I did not understand how did you print
> >> to your HP.
> >>
> >> Anyway , I think that if you want to get the same proportions between
> >> what you see on the screen and what you print (with millimeter
> >> accuracy), have to look to compensation factors.
> >>
> >> For example with the components gb.qt4 and gb.qt4.ext, I use 0.352778
> >> for change mm in px, I use 72 for print resolution and I use the
> >> compensation factor for the font size (see my examples).
> >>
> >> hope that helps
> >>
> >> gianluigi
> >>
> >> PS: But I think that GTK not interested at the resolution. :-)
> >>
> >>
> >> Il 10/10/2014 21:12, Paul Horechuk ha scritto:
> >>> Thanks. I'll check them out.
> >>>
> >>> On 14-10-10 05:04 AM, Gian wrote:
> >>>> Hello Paul,
> >>>>
> >>>> attached two small demonstrations that might inspire you.
> >>>> gianluigi
> >>>>
> >>>>
> >>>>
> >>>>> Le 08/10/2014 18:20, Paul Horechuk a écrit :
> >>>>>> I have a successful project that formats a sheet of labels on an
> Avery
> >>>>>> form and prints directly to an HP OfficeJet 7500 E910.
> >>>>>>
> >>>>>> I set the printer width to 850 and length to 1100 with a resolution
> of
> >>>>>> 100. These may not be correct for all (PrinterWidth and length are
> seen
> >>>>>> as 216 by 279mm), but by setting moveto coordinates within this
> >>>>>> range, I
> >>>>>> do get a correct sheet of labels.
> >>>>>>
> >>>>>> Problems:
> >>>>>>
> >>>>>> On a customer printer with the same version of gambas 3.5.4, the
> >>>>>> coordinates are stretched so that the labels are stretched by about
> >>>>>> 50%.
> >>>>>> This is on a Canon Pixma.
> >>>>>>
> >>>>>> Further checking shows a print to file (as PDF) from the printer
> >>>>>> dialog,
> >>>>>> resulting in:
> >>>>>>
> >>>>>>        *    vertical resolution is about 1/4 of what it should be
> >>>>>>        *    fonts are correctly sized
> >>>>>>        *    horizontal positioning is about 1/4 as well
> >>>>>>        *    therefore all text is compressed into the upper left
> >>>>>>        *    a QR code is about 1/4 the expected size
> >>>>>>
> >>>>>>
> >>>>>> Changing the resolution for a direct print to Pixma has no effect.
> >>>>>> Changing from 100 to 75 or to 150, results in the same stretched
> >>>>>> printout. This works as expected on the HP.
> >>>>>>
> >>>>>> Suggestions?
> >>>>>>
> >>>>> The first thing I can quicky tell you: you must not use the printer
> >>>>> resolution when drawing on a printer.
> >>>>>
> >>>>> If you use it, then something is doomed in your drawing routine,
> unless
> >>>>> you want to draw at the pixel level, for example the thinest possible
> >>>>> line (one pixel). Then you need the printer resolution, but this is
> the
> >>>>> only case.
> >>>>>
> >>>>> Otherwise, in all normal printing routines, printer resolution is not
> >>>>> needed.
> >>>>>
> >>>>> But maybe I didn't understand what you wrote...
> >>>>>
> >>>>
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