[Gambas-user] print resolution issues

[Gian]

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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