bernhard: thuban/Extensions/svgexport/test test_svgmapwriter.py, 1.9, 1.10

[Bernhard Reiter]

On Tue, Dec 07, 2004 at 12:44:59PM +0100, Bernhard Reiter wrote:
> On Tue, Dec 07, 2004 at 12:37:52PM +0100, Bernhard Herzog wrote:
> > cvs at intevation.de writes:
> > 
> > > +    def test_drawbezier(self):
> > > +        '''Test DrawSpline (which actually draws bezier curves).'''
> > > +        data = ('<path style="stroke-linejoin:round; stroke:#ff00ff; '
> > > +                'stroke-width:3; stroke-linecap:round; fill:none" ' 
> > > +                'meta="Object:test; Label:nothing" d="M 10 10 '
> > > +                'C 15 12 15 8.0 20 10"/>')

> > > +        dc.DrawSpline([ Point(10, 10),
> > > +                        Point(15, 12),
> > > +                        Point(15,  8.0),
> > > +                        Point(20, 10) ])
> > 
> > Looking at the DrawSpline code in wxWidgets, it seems that the
> > coordinates of the spline do not translate directly to the coordinates
> > of the control points of a cubic bezier curve as you assume here.
> 
> Ah, thanks for noticing this.
> So it is broken until I understand this better and can fix it.
> 
> > Rather a cubic bezier curve derived in some other fashion from the
> > parameters to DrawSpline.  The docs say that the algorithm was taken
> > from XFig, so I'd assume it's what XFig <= 3.1 calls interpolated
> > splines.  

The wx docs also say that 
	DrawSpline takes only three coordinates, but 
	Thuban/UI/classifier.py gives four arguments.

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