About the problem of losing entities drawn in pictures

[asd513921]

I created a new object and filtered out some entities

and save it as a dxf file

and save it as a picture

But when you open the dxf file, the content you see is different from the picture. The picture lacks some line segments
This is dxf's

This is the picture

The line on the arrow part is missing
ezdxf version 1.14
What's the reason

[mozman]

Test your code without the entity-filter: xref.load_modelspace(..., filterfn=...)

My first assumption is always: Your code is wrong!

If the error still exist, reduce your code and DXF file to a minimum so I can debug the issue.

EDIT:

Do not test multiple processing steps at once:

1. test if the import works
2. test if the image export works

[mozman]

Please, Read the Docs!

1. Window(first_corner, second_corner)

2. You don't need to import the entities, just draw the selected entities:

import ezdxf
import matplotlib.pyplot as plt

from ezdxf import select
from ezdxf.addons.drawing.properties import RenderContext
from ezdxf.addons.drawing.config import Configuration
from ezdxf.addons.drawing.frontend import Frontend
from ezdxf.addons.drawing.matplotlib import MatplotlibBackend

from ezdxf.bbox import Cache

def main():
    doc = ezdxf.readfile("x-ef.dxf")
    msp = doc.modelspace()

    # set window coordinates here:
    p0 = (283_000, 0)  
    p1 = (357_000, 54_000)
    window = select.Window(p0, p1)
    # if you draw multiple regions use a bounding box cache:
    bbox_cache = Cache()
    selected_entities  = select.bbox_overlap(window, msp, cache=bbox_cache)

    fig, ax = plt.subplots() 
    ax.set_aspect('equal', 'box') 
    ctx = RenderContext(doc)
    ctx.set_current_layout(msp)  # modelspace is the default!
    out = MatplotlibBackend(ax)
    config = Configuration.defaults().with_changes(
        min_lineweight=0.01, 
        lineweight_scaling=0.5,
    )
    frontend = Frontend(ctx, out, config)
    frontend.draw_entities(selected_entities)
    out.finalize()  # explicit call required
    out.set_background("#0a0a0a")
    fig.savefig('output1.png', dpi=2500, bbox_inches='tight')
    plt.close(fig)


if __name__ == "__main__":
    main()

[asd513921]

Thank you for your correction! I still have the above problems when I execute your code, and the picture output with the following coordinates still has several line segments not drawn
p0 = (789970.2299576874, 12005.03740519899)
p1 = (829851.4285404719, 45313.84934104128)

[asd513921]

[mozman]

Your selected region in BricsCAD:

Output1:

This is my last reply!!!

[asd513921]

Thank you for your patient guidance!

[asd513921]

trying to convert a two-point LWPOLYLINE entity to a LINE entity solves this problem!