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# 导入Manim核心库
from manim import *
class FittingObjects ( Scene ) :
def construct ( self ) :
# 坐标系放在左侧边缘
axes = Axes ( x_range = [ - 3 , 3 , 1 ] , y_range = [ - 3 , 3 , 1 ] , x_length = 6 , y_length = 6 )
# 坐标系距离左侧有0.5的缓冲距离
axes . to_edge ( LEFT , buff = 0.5 )
# 圆,线宽颜色，填充颜色和透明度
circle = Circle ( stroke_width = 6 , stroke_color = YELLOW , fill_color = RED , fill_opacity = 0.8 )
# 圆的宽度是2， ，
circle . set_width ( 2 ) . to_edge ( DR , buff = 0 )
# 创建三角形，
triangle = Triangle ( stroke_color = ORANGE , stroke_width = 10 , fill_color = GREY ) . set_height ( 2 ) . shift (
DOWN * 3 + RIGHT * 3 )
# 创建动画 画坐标系
self . play ( Write ( axes ) )
# 创建动画 画线然后填充圆
self . play ( DrawBorderThenFill ( circle ) )
# 形态动画 圆变化宽度
self . play ( circle . animate . set_width ( 1 ) )
# 转变动画 将圆向三角转变
self . play ( Transform ( circle , triangle ) , run_time = 3 )
