| Vertical text alignment in postscript [message #54861] |
Tue, 17 July 2007 02:59  |
Andy Heaps
Messages: 22
Registered: March 2006
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Junior Member |
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I'm trying to align text vertically in postscript but have some extra
space
above where the text finishes.Using !D.Y_CH_SIZE/2.0 as the mid-point
means that the text is now not vertically aligned.
Has anyone an explanation/solution for this problem?
Attached is a small program to show the problem.
Many thanks
Andy
PRO ll
SET_PLOT, 'ps'
DEVICE, FILE='ll.ps', XSIZE=8.27, YSIZE=11.69, $
XOFFSET=0.5, YOFFSET=0.5, /INCHES, /COLOR
!P.COLOR=1
!P.FONT=0
!P.POSITION=[0.1,0.3,0.9,0.6]
r = [255,0]
g = [255,0]
b = [255,0]
TVLCT,r,g,b
mysize=6.0 ;Size of our text
ypix=!D.Y_CH_SIZE*mysize ;Height of text in pixels
xstart=1000 ;X start of plotting
xfinish=20000 ;X finish of plotting
ystart=5000 ;Y start of plotting
XYOUTS, xstart, ystart, CHARSIZE=mysize, 'Testing 123', /DEVICE
PLOTS, [xstart, xfinish], [ystart, ystart], /DEVICE ;Bottom of text
PLOTS, [xstart, xfinish], [ystart+ypix, ystart+ypix], /DEVICE ;Top of text
DEVICE, /CLOSE
END
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| Re: Vertical text alignment in postscript [message #54930 is a reply to message #54861] |
Wed, 18 July 2007 06:39  |
Andy Heaps
Messages: 22
Registered: March 2006
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Junior Member |
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Many thanks for the replies - they were very useful.
The space that I was referring to is the spacing between text lines.
As I don't use more than one line of text at a time this wasn't
something I'd thought of.
To get a fairly decent approximation of the true height of true type
fonts in postscript I used the formula:
ypixels=!D.Y_CH_SIZE*charsize*0.84
Where ypixels is the height in pixels and charsize is size of the
characters passed to the xyouts procedure.
The scaling factor of 0.84 to get the best fit changes according to
the font used but 0.84 looks pretty good for Helvetica and Times.
Cheers
Andy
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