Re: [Inkscape-user] Inkscape and DXF files?

23 Oct 2007

      Hi Stéphane
This looks very interesting, you also have a beautiful website-Patrick
Stéphane ANCELOT wrote:
...
Hi,
I have already done the same kind of thing but from dxf to svg.
have a look at http://sancelot.wordpress.com/2007/07/13/enhanced-dxf2svg/
you will find my code :
// create curves points from spline definition
void spline::compute_path()
{
int step = 25;
double t,t2,t3;
double Cm1,C0,C1,C2;
ctrl_pts r,Pm1,p0,p1,p2;
computed_path.clear();
for (int i=0;i< control_points.size() - 3;i++)
{
Pm1 = control_points[i];
p0 = control_points[i+1];
p1 = control_points[i+2];
p2 = control_points[i+3];
for (int s=0;s<=step;s++)
   {
   t = double(s) / (double) step;
   t2 = t  * t;
   t3 = t2 * t;
   Cm1 = -1.0/6.0 * t3 + 0.5 * t2 - 0.5 * t + 1.0/6.0;
   C0 = .5 * t3 - t2 +2.0/3.0;
   C1 = -.5*t3+.5*t2+.5*t+1.0/6.0;
   C2 = 1.0/6.0*t3;
   r.x = Cm1*Pm1.x+C0*p0.x + C1*p1.x+C2*p2.x;
   r.y = Cm1*Pm1.y+C0*p0.y + C1*p1.y+C2*p2.y;
   r.z = 0;
   computed_path.push_back(r);
   }
}
}
Best Regards
S.Ancelot
Aaron Spike a écrit :
...
Jim Ford wrote:
...
Are the dxf files created by Inkscape's export non standard or otherwise 
'funny'? Does anyone know of a 'workaround' for this problem, please?
The DXF files exported by Inkscape export curves as standard DXF
SPLINEs. Some software is not able to handle such NURB curves. An option
would be to decompose the curves into polylines, though this would make
the output noticeably slower and less exact. Please recognise that the
DXF output from Inkscape is not expected to be generally useful DXF
output. It was developed to suit the needs of a very specific community
of users and is labeled as such.
Aaron Spike

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