Re: [PyX-user] labeling curves

[Andre W. <wo...@us...>]

Hi,

On 13.09.05, Rich Drewes wrote:
> The "angle" argument doesn't seem to result in rotations of the placed 
> text.  Is it supposed to?

No, it's the direction used for alignment. We could (and even should
at least have an option to) do this perpendicular to the path.

To come back to your original question, you should add a rotation to
the textattrs. Unfortunately you'll overwrite the text.halign.center
and text.vshift.mathaxis by that. The PyX-way would be to merge those
attributes the the additional attributes. So the code would look like:

    class textdeco(deco.deco, attr.attr):

        def __init__(self, text, textattrs=[],
                           angle=0, textdist=0.2, relarcpos=0.5, 
                           texrunner=text.defaulttexrunner):
            self.text = text
            self.textattrs = textattrs
            self.angle = angle
            self.textdist = textdist
            self.relarcpos = relarcpos
            self.texrunner = texrunner

        def decorate(self, dp):
            x, y = dp.path.at(self.relarcpos * dp.path.arclen())
            textattrs = attr.mergeattrs([text.halign.center, text.vshift.mathaxis] + self.textattrs)
            t = self.texrunner.text(x, y, self.text, textattrs)
            t.linealign(self.textdist, math.cos(self.angle*math.pi/180), 
            math.sin(self.angle*math.pi/180))
            dp.ornaments.insert(t)
            return dp


    c = canvas.canvas()
    c.stroke(path.curve(0, 0, 3, 0, 2, 5, 5, 5), [textdeco("Hello, world!", textattrs=[trafo.rotate(45)])])
    c.writeEPSfile("textdeco")


André

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