Pat file reader - WPF/XAML

Rflash25 · September 11, 2025, 4:29pm

Hi,

I’m trying to create a pat file reader, basically have an interface to show the preview of the pattern before load it into Revit. Is there any resources I can reference?

Thanks,

J

maw-wam · September 18, 2025, 1:54am

I’ve been pottering around with a pyRevit tool to create brick and tile patterns, where I can enter brick and mortar dimensions and get various patterns and have been working on a wpm/xaml ui for it. I had been creating png previews of the patterns, but with thumb and large views and the intent to add other patterns over time it makes more sense to create a preview directly from a pat file or string. Your query has prompted me to sync my most recent efforts (developed with the help of Gemini) up to the GitHub site. I haven’t got it working yet but maybe it helps you move forward.

github.com/mawdesign/pyMAW-dev

maw-dev.extension/pyMAW.tab/Tools.panel/Make%20Brick%20Pattern.pushbutton/pat_lib.py

main

import math

class PatternLineFamily:
    """
    Represents a single line family definition from a .pat file.
    
    This class is a simple data container for one line of a pattern definition,
    describing an infinite set of parallel lines.
    """
    def __init__(self, angle, origin_x, origin_y, delta_x, delta_y, dashes):
        """
        Initializes a PatternLineFamily instance.

        Args:
            angle (float): The angle of the lines in degrees.
            origin_x (float): The x-coordinate of the origin point.
            origin_y (float): The y-coordinate of the origin point.
            delta_x (float): Perpendicular displacement between lines in the family.
            delta_y (float): Parallel displacement (stagger) between lines.
            dashes (list[float]): A list of dash/gap lengths. Positive is a line,

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