Keeping dot over the line

[Gedicht2von101]

Hi, i can't understand how to keep sequence of animations and dot over the line and how change thickness of line.

from manim import *

class Triangle(Scene):
    def construct(self):
        dotA = Dot([-2,0,0], .05)
        dotB = Dot([2,0,0], .05)
        dotC = Dot([-1,2,0], .05)
        Atext = MathTex("A", font_size=24).next_to(dotA, DOWN + LEFT).set_color(YELLOW)
        Btext = MathTex("B", font_size=24).next_to(dotB, RIGHT + DOWN).set_color(YELLOW)
        Ctext = MathTex("C", font_size=24).next_to(dotC, UP).set_color(YELLOW)
        lineA = Line(dotB.get_center(), dotC.get_center()).set_color(RED)
        lineB = Line(dotA.get_center(), dotC.get_center()).set_color(RED)
        lineC = Line(dotA.get_center(), dotB.get_center()).set_color(RED)
        dotA1 = Dot(lineA.get_midpoint(), .05)
        dotB1 = Dot(lineB.get_midpoint(), .05)
        A1text = MathTex("A_1", font_size=24).next_to(dotA1, RIGHT).set_color(YELLOW)
        B1text = MathTex("B_1", font_size=24).next_to(dotB1, LEFT).set_color(YELLOW)
        lineA1 = Line(dotA.get_center(), dotA1.get_center()).set_color(RED)
        lineB1 = Line(dotB.get_center(), dotB1.get_center()).set_color(RED)

        self.play(Write(dotA))
        self.play(Write(Atext))
        self.play(Write(lineC))
        self.play(Write(dotB))
        self.play(Write(Btext))
        self.play(Write(lineA))
        self.play(Write(dotC))
        self.play(Write(Ctext))
        self.play(Write(lineB))
        self.play(Write(dotA1))
        self.play(Write(A1text))
        self.play(Write(lineA1))
        self.play(Write(dotB1)) 
        self.play(Write(B1text))
        self.play(Write(lineB1))
        self.wait(1)

[SuperUser-Vermeylen]

This may help.

I searched for "foreground" in a search engine.

[Gedicht2von101]

Thank you so much! Do you know how to change thickness of line?

[SuperUser-Vermeylen]

I think "width" is the keyword you want.
I'm pretty new to Manim as well, so i recommend investigating the docs and ask questions here.

[Gedicht2von101]

Keywords like "width" are undefined. I searched for this on a variety of resources, and didn't find it. It may change by option .scale() but it need to increase length.