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http://www.openoffice.org/issues/show_bug.cgi?id=115096
------- Additional comments from osn...@openoffice.org Tue Nov 30 11:37:54
+0000 2010 -------
> Many thanks for your help and reworking your previous patch
No problem ; as these b2dpolygontools functions exist, it was quite natural to
rewrite the patch to use them...
> I think the remaining problems with the arc can be traced back to
> void OutputDevice::DrawPolyLine where a conversion from b2dpolygon with double
> precision to a tools polygon with integer precision takes place.
I dig a little more, and indeed the problem seems to come from
OutputDevice::DrawPolyLine but I am not sure that the problem comes only from
the double to
int conversion:
Ie. For the Arc: Pt=21x208, dim = 56x56, angl = 5.67232x0.0174534
b2dpolygontools generates the Polygon (*):
Pt0:pos = 66.8725x175.88, prev = _, next = 67.858x177.287
Pt1:pos = 69.4974x180, prev = 68.6383x178.512, next = 74.6521x188.928
Pt2:pos = 77x208, prev = 77x197.691, next = 77x208.344
Pt3:pos = 76.9915x208.977, prev = 76.9975x208.634, next = _
which seems correct ; I will attach a picture which zooms the problematic arc,
where I have added:
- in blue the segments from the previous control point to position
- and in green the segments from position to the next control point
with the basic coordinate grid alignment.
The picture made me think that OutputDevice::DrawPolyLine had used the next
control point of Pt0 (instead of the previous control point of Pt1) to draw the
second spline...
(*) where
- pos is the point obtained by poly.getB2DPoint(i)
- prev is the point obtained by poly.getPrevControlPoint(i)
- next is the point obtained by poly.getNextControlPoint(i)
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