OpenEuphoria

Re: Printing graphics question

• Posted by Derek Parnell <ddparnell at bigpond.com> Dec 17, 2004
• 478 views

don cole wrote:
> 
> 
> }}}
<eucode>
>        junk=getPrinter()
>          if startDoc( "My Print Job" ) then-- start up the document
>          end if
>        junk=startPage()
> 
>         drawEllipse(id,False, 10, 10,   100, 100)
> 
>         if endDoc() then
>          releasePrinter()
>         end if
> </eurcode>
> 
> The above code works fine if id is a window,
> but prints nothing if it is Printer.
> 
> Is there an easy of doing this or do I have to make bitmaps?

Yes it is this easy. However I can see two things you might need to do.

You need an EndPage() call, plus you need to scale it correctly. The size
of a screen pixel is not the same as a printer pixel.

For a 100x100 screen ellipse, you need to calculate the how big that is 
needed to be on your printer.

Calculate FacX = (w32Func(xGetDeviceCaps(Printer, LOGPIXELSX) /
                  w32Func(xGetDeviceCaps(Screen, LOGPIXELSX) )
 
Calculate FacY = (w32Func(xGetDeviceCaps(Printer, LOGPIXELSY) /
                  w32Func(xGetDeviceCaps(Screen, LOGPIXELSY) )
 
To scale, multiply the screen X values by FacX and the Screen Y values by
FacY to get the pixel sizes for your printer.

Another factor to look out for, if you are using a color printer, is to
make sure that the screen color will be still suitable for the page.

-- 
Derek Parnell
Melbourne, Australia