How can I get polyline color?

[Henry Zhang]

Hi, 

I can get polyline from the attached dxf file with the following code. How can I get ployline color from the dxf file as well? Attached a screenshot from Autodesk Viewer, and there are three colors on it. 

import ezdxf
from ezdxf import DXFStructureError

try:
    doc = ezdxf.readfile("w3b1-0552-3250-PP-20200621.dxf")
    msp = doc.modelspace()
    polylines = msp.query('POLYLINE')
    for polyline in polylines:
        print('Polyline #{}'.format(polyline.dxf.handle))
        for i, location in enumerate(polyline.points()):
            print('Point at index {}: {}'.format(i, location))
except DXFStructureError as error:
    print(error)

Regards,

Henry

[Manfred Moitzi]

import ezdxf
from ezdxf.tools.rgb import DXF_DEFAULT_COLORS, int2rgb

doc = ezdxf.readfile('w3b1-0552-3250-PP-20200621.dxf')
msp = doc.modelspace()
polylines = msp.query('POLYLINE')
for polyline in polylines:

    print(str(polyline))
    # AutoCAD Color Index
    aci = polyline.dxf.color
    print(f'Color Index: {aci}')
    # RGB values of default colors are not officially documented,
    # but an accurate translation table is included in ezdxf
    rgb24 = DXF_DEFAULT_COLORS[aci]  # 24 bit value RRRRRRRRGGGGGGGGBBBBBBBB
    print(f'RGB Hex Value: #{rgb24:06X}')
    r, g, b = int2rgb(rgb24)
    print(f'RGB Channel Values: R={r:02X} G={g:02X} b={b:02X}')
    print()

The ACI color index 7 is special: white on dark background and black on light background.

Best Regards,

Manfred

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[Manfred Moitzi]

Added two how-tos to the documentation:

How to get/set colors, which also shows how to handle BYLAYER values: https://ezdxf.mozman.at/docs/howto/content.html#get-set-entity-color  

How to get/set true color values:  https://ezdxf.mozman.at/docs/howto/content.html#get-set-entity-rgb-color 

Best regards,

Manfred