[Mark lines] mark lines with orthogonal tick marks. #manim #geometry #line

20240704_markline.py

from manim import *
# https://discord.com/channels/581738731934056449/1174899083949899866/1175046975662604358
# by Abulafia

def mark_line(line, n_marks=1, length=0.3, distance=0.1, color=RED):
    marks = VGroup(*[Line(ORIGIN, length*UP, color=color) for _ in range(n_marks)])
    marks.arrange(RIGHT, buff=distance)
    marks.rotate(line.get_angle())
    marks.move_to(line.get_center())
    return marks



class Test(MovingCameraScene):    
    def construct(self):
        triangle = Polygon(ORIGIN, 2*RIGHT, 2*RIGHT+UP, color=BLUE).rotate(20*DEGREES).scale(2)
        self.add(triangle)
        sides = []
        for i in range(3):
            sides.append(Line(triangle.get_vertices()[i], triangle.get_vertices()[(i+1)%3]))
        for i, side in enumerate(sides):
            self.add(mark_line(side, n_marks=i+1))

readme.md

https://discord.com/channels/581738731934056449/1174899083949899866/1175046975662604358