52 lines
1.3 KiB
Python
52 lines
1.3 KiB
Python
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from manim import *
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field = Rectangle(width=10.0, height=5.0)
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class Billboard(Rectangle):
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def __init__(self, x, y, w, h):
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Rectangle.__init__(self, width=w, height=h)
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self.x = x
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self.y = y
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self.w = w
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self.h = h
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self.align_to(field, UL)
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self.shift(x*RIGHT + y*DOWN)
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class Scanline(VGroup):
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def __init__(self):
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self.line = Line(field.get_top(), field.get_bottom(), color=RED).align_to(field, LEFT)
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self.tops = dict()
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VGroup.__init__(self)
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self.add(self.line)
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def insert(self, y):
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self.tops[y] = Dot().move_to(self.line.get_top()).shift(y*DOWN)
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self.add(self.tops[y])
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def delete(self, y):
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self.remove(self.tops[y])
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del self.tops[y]
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class Main(Scene):
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def construct(self):
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boards = [Billboard(x, y, w, h) for x, y, w, h in [(1, 0, 3, 3), (2, 2, 5, 2)]]
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self.add(*boards)
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poi = sorted([(b.x, 1, i) for i, b in enumerate(boards)] + [(b.x + b.w, -1, i) for i, b in enumerate(boards)])
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scan = Scanline()
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for x, left, i in poi:
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self.play(scan.animate.move_to(field.get_left() + x*RIGHT))
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if left == 1:
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scan.insert(boards[i].y)
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else:
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scan.delete(boards[i].y)
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self.wait(2)
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