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Re: Why the font is smaller in the IDLgrBuffer ? [message #65419 is a reply to message #65337]

Fri, 27 February 2009 12:41

natha
Messages: 482
Registered: October 2007

Senior Member

Hi Rick,

I wrote a small routine to aproximate the font size in the buffer to
the original font size.
It's a crazy solution. See below...

With your idea all results more easy.
The only thing to do is set the RESOLUTION property on the
IDLgrBuffer. Like that:
resolution=[1d/!D.X_PX_CM,1d/!D.Y_PX_CM]
oBuffer->SetProperty, RESOLUTION=resolution)

The problem is that !D.XY_PX_CM only returns the approximate number of
pixels per centimeter in the X and Y directions so the font size
changes a little bit beacause the resolution is not exact.

There is another way to get the DPI ?

Thanks,

Bernat

;----------------------------------------------------------- -------------------------

PRO TEST_BUFFER_FONT, font_size, dimensions, $ ;;input
final_font_size ;;output

tt=SYSTIME(/SEC)

oView=OBJ_NEW('IDlgrView', VIEWPLANE_RECT=[0,0,dimensions
[0],dimensions[1]])
oModel=OBJ_NEW('IDLgrModel')
oModel->SetProperty, /DEPTH_WRITE_DISABLE
oView->Add, oModel

buff_font=OBJ_NEW('IDLgrFont', 'Helvetica', SIZE=font_size, THICK=2)
buff_text=OBJ_NEW('IDLgrText', STRING='null text', FONT=buff_font,
RECOMPUTE_DIMENSIONS=2)
oModel->Add, buff_text

oBuffer=OBJ_NEW('IDLgrBuffer', DIMENSIONS=dimensions)
oBuffer->Draw, oView

buff_text_dim=oBuffer->GetTextDimensions(buff_text)

count=1.
WHILE buff_text_dim[1] LT font_size DO BEGIN
buff_font->SetProperty, SIZE=font_size+count
oBuffer->Draw, oView
buff_text_dim=oBuffer->GetTextDimensions(buff_text)
count=count+1.
ENDWHILE

PRINT, 'Font size / size after buffer ', font_size, buff_text_dim[1]

final_font_size=font_size+count

OBJ_DESTROY, [oView, oModel, oBuffer, buff_font, buff_text]

PRINT, 'TEST_BUFER_FONT TIME ', SYSTIME(/SEC)-tt
END

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[Message index]

		Why the font is smaller in the IDLgrBuffer ? By: natha on Fri, 27 February 2009 07:50
		Re: Why the font is smaller in the IDLgrBuffer ? By: R.Bauer on Sat, 28 February 2009 02:59
		Re: Why the font is smaller in the IDLgrBuffer ? By: natha on Fri, 27 February 2009 13:19
		Re: Why the font is smaller in the IDLgrBuffer ? By: Michael Galloy on Fri, 27 February 2009 13:05
		Re: Why the font is smaller in the IDLgrBuffer ? By: natha on Fri, 27 February 2009 12:41

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