How to position shapes (triangle)

[vavu786]

Hello,
I hope you all are doing well.
I am completely new to manim and I started looking at it a few days ago.
I was wondering how the positioning in manim works.
So here is my code:

triangle_big = Triangle()
triangle_small = Triangle()
triangle_small.scale(0.5)
self.play(ShowCreation(triangle_big))
self.wait()
self.play(ShowCreation(triangle_small))
self.wait()

This puts the triangles on top of each other like this:

I want the triangles to be like this, with one of the vertices of each triangle aligned:

Could somebody please show me how to do this?
Thank you so much.
Please let me know if my question is in the wrong place, or needs more clarification.

• Hamza

[TonyCrane]

Sorry to respond so late.
Is this what you want?

The best way to do this is to use align_to method:

triangle_small.align_to(triangle_big, DL)

and you can also use next_to or shift:

triangle_small.next_to(triangle_big.get_vertices()[1], aligned_edge=DL, buff=0)
triangle_small.shift(triangle_big.get_vertices()[1] - triangle_small.get_vertices()[1])

get_vertices method get the vertices (a list of points) of the triangle, and the indexes of the list of vertices are:

So the vertice in the lower left corner is triangle.get_vertices()[1].
And you can also directly put the small triangle to the target position by using the about_point parameter of scale:

triangle_small.scale(0.5, about_point=triangle_big.get_vertices()[1])

---

btw, if you want to learn more about position in manim, you can watch this video. (Although this video is in Chinese, it has no great influence on learning the content. You can just watch the screen and ignore the Chinese subtitles.)

[vavu786]

Thank you so much for such a thorough answer! I really appreciate your help Tony. Have a great day.

[3b1b]

You can also use an argument of move_to, for example

triangle_small.move_to(triangle_big, DL)