POLYFACE

Create a new polyface entity, polyface is a dxf-polyline entity!. A Polyface consist of one or more faces, where each face can have three or four 3D points.

DXFEngine.polyface(precision=6, **kwargs)

Parameters:precision – vertex-coords will be rounded to precision places, and if the vertex is equal to an other vertex, only one vertex will be used, this reduces filespace, the coords will be rounded only for the comparison of the vertices, the output file has the full float resolution.

The flags-bit POLYLINE_POLYFACE is set.

for kwargs see POLYLINE

Methods

Polyface.add_face(self, vertices, color=0):

This is the recommend method for adding faces.

Parameters:

• vertices – is a list or tuple with 3 or 4 points (x,y,z).
• color (int) – range [1..255], 0 = BYBLOCK, 256 = BYLAYER

Example

from dxfwrite import DXFEngine as dxf

def get_cube(basepoint, length):
    def scale( point ):
        return ( (basepoint[0]+point[0]*length),
                 (basepoint[1]+point[1]*length),
                 (basepoint[2]+point[2]*length))
    pface = dxf.polyface()
    # cube corner points
    p1 = scale( (0,0,0) )
    p2 = scale( (0,0,1) )
    p3 = scale( (0,1,0) )
    p4 = scale( (0,1,1) )
    p5 = scale( (1,0,0) )
    p6 = scale( (1,0,1) )
    p7 = scale( (1,1,0) )
    p8 = scale( (1,1,1) )

    # define the 6 cube faces
    # look into -x direction
    # Every add_face adds 4 vertices 6x4 = 24 vertices
    # On dxf output double vertices will be removed.
    pface.add_face([p1, p5, p7, p3], color=1) # base
    pface.add_face([p1, p5, p6, p2], color=2) # left
    pface.add_face([p5, p7, p8, p6], color=3) # front
    pface.add_face([p7, p8, p4, p3], color=4) # right
    pface.add_face([p1, p3, p4, p2], color=5) # back
    pface.add_face([p2, p6, p8, p4], color=6) # top
    return pface

def simple_faces():
    pface = dxf.polyface()
    p1 = (0,0,0)
    p2 = (0,1,0)
    p3 = (1,1,0)
    p4 = (1,0,0)

    p5 = (0,0,1)
    p6 = (0,1,1)
    p7 = (1,1,1)
    p8 = (1,0,1)

    pface.add_face([p1, p2, p3, p4]) # base
    pface.add_face([p5, p6, p7, p8]) # top