Re: Add \path markup command, and use it for \eyeglasses. (issue1730044)

[pnorcks]

On 2010/06/22 03:50:24, Carl wrote:
> On 2010/06/21 22:39:53, Patrick McCarty wrote:
> > On 2010/06/20 11:07:37, Carl wrote:
> > > Is it possible to have the path command estimate reasonable
> > > extents, rather than using (0 . 0) and (0 . 0)?  Since we
> > > know the thickness of the line, and we have a list of
> > > points, it seems we should be able to keep track of the
> > > maximum and minimum X and Y coordinates during the path
> > > creation.
> >
> > This should be possible, but I'm not sure how to implement it,
> > especially when relative coordinates are involved.

> My first thought would be to start with currentx=currenty=
> xmax=xmin=ymax=ymin = 0.

> For an absolute move, set currentx = move x, currenty = move y.

> For a relative move, set currentx += movex, currenty += movey.

> If currentx > xmax, xmax=currentx.  If currenty > ymax,
> ymax=currenty.  If currentx < xmin, xmin = currentx.  If
> currenty < ymin, ymin = currenty.

> For curves, go one point at a time.  The control points bound
> the curve, so you can use the control points as if they were
> curve points.

> When you're done with all the points, add half the thickness to
> xmax and ymax, and subtract half the thickness from xmin and
> ymin.

> I haven't tried it, but it seems to me it should work.

Hi Carl,

Thanks for your help.

I've uploaded a new patch set that (more or less) follows your
algorithm above, and also changes the interface again (according
to Han-Wen's and Jan's comments).

Let me know what you think.

Thanks,
Patrick


http://codereview.appspot.com/1730044/show