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Re: [changeset] print.m (matlab compatibility)


From: Ben Abbott
Subject: Re: [changeset] print.m (matlab compatibility)
Date: Tue, 10 Mar 2009 12:39:24 +0800


On Mar 10, 2009, at 12:02 PM, John W. Eaton wrote:

On 10-Mar-2009, Ben Abbott wrote:

| Does the attached find a font that works with the png terminal on our
| system?

No.  But is it something we can fix in Octave?  I think it is just
that gnuplot on my system doesn't know where to find fonts.  I can
probably work around it by setting GDFONTPATH, but should every user
have to do that?  Especially on systems like Debian where there are
packages.  OTOH, running gnuplot and generating a png file with some
labels works when I don't explicitly set any font.  So if Octave's
default font is "*", can we just skip passing a font name to gnuplot?
Will that work?

jwe


I don't think so.

(1) gnuplot assumes the canvas is 6 inches wide and sets the conversion of pixels to/from points on this assumption.

(2) gnuplot positions the tick-labels, axes-labels, and title using the default character width for each terminal type (normally 12pt, but not always).

I *think* I have all the font scaling/positioning done correctly to obtain the desired result for any resolution, but this requires that octave is permitted to tell gnuplot what the fontsize is for every text object, *and* requires that each text object's position be adjusted.

In order to obtain the proper size and position for the tick-labels, axes-labels, and title I scale and offset each of these.

Without any TrueType and Type-1 fonts, there are only five fonts available from the GD library, and they do not scale. From the manual ...

Five basic fonts are supported directly by the gd library. These are tiny (5x8 pixels), small (6x12 pixels), medium, (7x13 Bold), large (8x16) or giant (9x15 pixels). These fonts cannot be scaled or
rotated (pure horizontal or vertical text only).

Without having a scalable font, I don't know how to reconcile this.

Would it be possible to include a single ttf, or pfa file with Octave?

Ben



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