Hi René, multilineto_pt is just an performance (and memory optimization), but does not bring any new features technically. Also, we provided it in postscript points only (hence the _pt suffix), so it is not the usual api to be used by end users. (Instead it is used to improve performance for certain graph plottings.)
Now, consider we want to construct a square of 100pt x 100 pt with
multilineto_pt, it'll look like:
p = path.path()
p.append(path.moveto_pt(0, 0))
p.append(path.multilineto_pt([(100, 0), (100, 100), (0, 100)]))
p.append(path.closepath())
We can achieve the same by using simple path elements like this:
p = path.path()
p.append(path.moveto_pt(0, 0))
p.append(path.lineto_pt(100, 0))
p.append(path.lineto_pt(100, 100))
p.append(path.lineto_pt(0, 100))
p.append(path.closepath())
It's just a few more objects being created, but the output is identical.
Now we can transfer it to use relative coordinates:
p = path.path()
p.append(path.moveto_pt(0, 0))
p.append(path.rlineto_pt(100, 0))
p.append(path.rlineto_pt(0, 100))
p.append(path.rlineto_pt(-100, 0))
p.append(path.closepath())
and also create the path using a list of points like this:
p = path.path()
p.append(path.moveto_pt(0, 0))
for x_pt, y_pt in [(100, 0), (0, 100), (-100, 0)]:
p.append(path.rlineto_pt(x_pt, y_pt))
p.append(path.closepath())
When you compare it to the starting point, you'll notice that instead of
appending the (non-existing) path.multirlineto_pt to a path, you need to insert
a number of rlineto_pt elements:
p.append(path.multirlineto_pt([(100, 0), (0, 100), (-100, 0)])) # does not
exist in PyX
is equivalent to
for x_pt, y_pt in [(100, 0), (0, 100), (-100, 0)]:
p.append(path.rlineto_pt(x_pt, y_pt))
Note that all this has nothing to do with gsave and grestore, which is only
related to the Postscript graphics state. You can translate the path and insert
it multiple times as you wish:
c.fill(p, [trafo.translate(1, 1)])
c.fill(p, [trafo.translate(2, 2)])
PyX does not optimize the output by storing such paths once on the stack and
reuse it multiple times, nor does it make use of "use"-tags in svg. This could
be done, but it just an output optimization.
Best,
André
Am 29.01.2016 um 16:25 schrieb [email protected]:
>
> Please, use https://translate.google.de or https://translate.google.fr
>
> 2016.01.28
>
> Guten Abend,
>
> ich habe eine Sammlung von Musikzeichen (Alterationen, Dynamik usw) in
> PostScript (ursprünglich von Daniel Taupin); ich habe einige nach SVG
> übersetzt.
>
> Die Übersetzung nach PyX geht fehl, weil 'multilineto_pt'
> absolute (x, y) erwartet.
>
> Wäre eine Klasse 'multirlineto_pt' möglich?
>
> In den EPS-files: Abkapselung durch gsave ... grestore.
>
> In den SVG-file, Anwendung der Symbole mit '<use .../>':
> z.B.:
> <use xlink:href="#diese" x="2800" y="-1500" transform="scale(0.1,-0.1)" />
>
> Oder gibt's das schon irgendwo in PyX ?
> (Ellipsen gibt es auch, nur nicht im Manual :)
>
>
> René Bastian
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