soi-manim/segment_tree/segment_tree.py

from manim import *

import networkx as nx

class Tree(Scene):
    def construct(self):
        n = 2**6
        vertices = list(range(1, 2*n))
        edges = [(v // 2, v) for v in vertices[1:]]

        #graph_vis = Graph(vertices, edges, labels=True, layout="tree", layout_config={"vertex_spacing": (1.0, 1.0)}, root_vertex=1)
        graph_vis = Graph(vertices, edges, labels=False, layout="tree", layout_config={"vertex_spacing": (.2, 1.1)}, root_vertex=1)

        self.play(Create(graph_vis))

        def query(v, tl, tr, ql, qr):
            if tr <= ql or qr <= tl:
                if v != 1:
                    graph_vis.edges[(v // 2, v)].color = RED
                self.play(Indicate(graph_vis[v], color=RED))
                return
            if ql <= tl and tr <= qr:
                if v != 1:
                    graph_vis.edges[(v // 2, v)].color = BLUE
                self.play(Indicate(graph_vis[v], color=BLUE))
                return

            if v!= 1:
                graph_vis.edges[(v // 2, v)].color = PURPLE
            graph_vis[v].color = PURPLE
            self.play(Indicate(graph_vis[v], color=YELLOW))

            m = (tl + tr) // 2
            query(2*v, tl, m, ql, qr)
            query(2*v+1, m, tr, ql, qr)


        query(1, 0, n, 42, 59)
        self.wait(2)