Ellipse

Type: Composite Entity

Ellipse curves are approximated by a POLYLINE.

For an explanation of ellipse curves see Wikipedia:

http://en.wikipedia.org/wiki/Ellipse

DXFEngine.ellipse(center, rx, ry, startangle=0., endangle=360., rotation=0., segments=100, **kwargs)

Parameters:

• center – center point (xy- or xyz-tuple), z-axis is 0 by default
• rx (float) – radius in x-axis
• ry (float) – radius in y-axis
• startangle (float) – in degree
• endangle (float) – in degree
• rotation (float) – angle between x-axis and ellipse-main-axis in degree
• segments (int) – count of line segments for polyline approximation
• linetype (str) – linetype name, if not defined = BYLAYER
• layer (str) – layer name
• color (int) – range [1..255], 0 = BYBLOCK, 256 = BYLAYER

Example

import dxfwrite
from dxfwrite import DXFEngine as dxf

name = 'ellipse.dxf'
dwg = dxf.drawing(name)

for axis in [0.5, 0.75, 1., 1.5,  2., 3.]:
    dwg.add(dxf.ellipse((0,0), 5., axis, segments=200))

dwg.add(dxf.line((-7, 0), (+7, 0), color=1, linetype='DASHDOT'))
dwg.add(dxf.line((0, -5), (0, +5), color=2, linetype='DASHDOT'))

for rotation in [0, 30, 45, 60, 90]:
    dwg.add(dxf.ellipse((20,0), 5., 2., rotation=rotation, segments=100))

for startangle in [0, 30, 45, 60, 90]:
    dwg.add(dxf.ellipse((40,0), 5., 2., startangle=startangle, endangle=startangle+90,
                        rotation=startangle, segments=90))
    dwg.add(dxf.ellipse((40,0), 5., 2., startangle=startangle+180, endangle=startangle+270,
                        rotation=startangle, segments=90))

dwg.save()