Re: [Lilypond-auto] Issue 4392 in lilypond: Doc: Add warning about ...

[lilypond]

Comment #2 on issue 4392 by address@hidden: Doc: Add warning about ...
https://code.google.com/p/lilypond/issues/detail?id=4392

On 06/05/15 08:32, ArnoldTheresius wrote:> Hello,

> at first I want to explain the 'concept' of the \postscript markup:
> * It is a low level output command. (similar to an 'assembler subroutine
> called from a high level programming language')
> * The string defined there will only be output into a postscript file (if
> you select a PS file to be created or any other output format which is
> created via an intermediate postscript file, e.g. PDF or PNG). On other
> output formats (e.g. SVG) it will be ignored.
> * There is no processing of the string before it's written into the PS  
> file,
> e.g. you have to set its extent manually if lilypond should take care of  
> it.
> * Your string will be embedded into the PS file with the postscript  
> commands
> 'gsave currentpoint translate 0.1 setlinewidth' before and 'grestore'  
> after
> it. After these preceeding commands (i.e. 'currentpoint translate') the
> origin of the current transformation is the reference point of your
> \postscript markup, scale and rotation of the current transformation  
> reflect
> the global staff line distance and (if applied) other transformation  
> markup
> command (e.g. \scale and \rotate) encapsulating your \postscript markup.  
> The
> current point is set to the coordinate 0 0 (it is not undefined!).


> pls-2 wrote
> > > Hi Arnold,
> > > ...
> > > True!  But why is the result correct in Ghostscript (but not in  
> > LilyPond)
> > > when I compile the following example?  It doesn’t even contain a moveto
> > > command:
> > > ...
> > > patrick
> > >
> > > _______________________________________________
> > > bug-lilypond mailing list
> > > bug-lilypond@
> > > https://lists.gnu.org/mailman/listinfo/bug-lilypond
> Your definiton of /square includes a 'newpath' and a 'moveto' at the
> beginning, while your definition of /doACircle does not.
> If you consult the desctiption of the 'arc' postscript command, you'll  
> find
> the arc command not only creates the arc geometry, it also creates a line
> geometry to the start point of this arc if appropriate. This can be used  
> to
> create a rounded rectangle with one 'moveto' and four 'arc' commands.

> ArnoldTheresius

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