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Matplotlib 動畫為每一幀繪制相同的東西

Python

慕桂英4014372 2022-10-25 14:49:44

我正在嘗試重新創建此視頻中的動畫。目前，我的代碼繪圖，但每一幀都與最后一幀相同。我試圖首先繪制頂點，然后一次繪制每個點。這些點是預先計算的，所以我想要的只是繪制當前點和它之前的點。下一步將是我制作動畫（編輯：即 gif 或 mp4），但那是在我可以讓這部分工作之后。import matplotlib.pyplot as pltfrom matplotlib.animation import FuncAnimationimport numpy as npimport randomvertices = np.array([[0,0], [2,0], [1,2.5]])dots = 100def newPos(index, old_x, old_y): vertex_x = vertices[index][0] vertex_y = vertices[index][1] new_x = 0.5*(vertex_x + old_x) new_y = 0.5*(vertex_y + old_y) return([new_x,new_y])global pointspoints = np.array([[0.25, 0.1]])for i in range(dots-1): points = np.concatenate((points, [newPos(random.randint(0,2), points[i][0], points[i][1])]), axis = 0)plt.figure()global indexindex = 0def animate(i): plt.cla() global index index += 1 plt.plot(vertices[0][0], vertices[0][1], 'o') global points plt.plot(points[0:index][0], points[0:index][1], 'o', color = '#1f77b4') plt.legend(['index = {0}'.format(index)], loc='upper left') plt.tight_layout()while index < dots: ani = FuncAnimation(plt.gcf(), animate, interval=15000/dots) plt.title('Chaos Game with {0} Vertices and {1} Steps'.format(len(vertices), dots)) plt.show()

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1 回答

智慧大石

TA貢獻1946條經驗獲得超3個贊

您似乎誤解了matplotlib.animation.funcanimation的工作原理，我強烈建議您查看網上可以找到的眾多示例中的一些。讓我們試試這個版本，如下所示：

import matplotlib.pyplot as plt

import matplotlib.animation as animation

import numpy as np

import random

vertices = np.array([[0,0],

[2,0],

[1,2.5],

[0,0]])

dots = 1000

# lower and higher bounds for x to be generated

int_lb = np.min(vertices[:,0])

int_hb = np.max(vertices[:,0])

def newPos(index, old_x, old_y):

vertex_x = vertices[index][0]

vertex_y = vertices[index][1]

new_x = 0.5*(vertex_x + old_x)

new_y = 0.5*(vertex_y + old_y)

return([new_x,new_y])

# evaluating all your points

points = np.array([[0.25, 0.1]])

for j in range(dots-1):

points = np.concatenate((points, [newPos(random.randint(int_lb,int_hb), points[j][0], points[j][1])]), axis=0)

fig = plt.figure()

ax = plt.gca()

ax.set_xlim([np.min(vertices[:,0])-0.05*np.max(vertices[:,0]),1.05*np.max(vertices[:,0])])

ax.set_ylim([np.min(vertices[:,1])-0.05*np.max(vertices[:,1]),1.05*np.max(vertices[:,1])])

ax.set_title('Chaos Game with {a} Vertices and Steps'.format(a=len(vertices)-1, b=dots))

# draw boundaries

ax.plot(vertices[:,0],vertices[:,1],'k-', linewidth=1)

# initialize scatter object for current step and all evaluated dots

scat_curr = ax.scatter([], [], marker='X', s=15, c='black')

scat_dots = ax.scatter([], [], marker='o', s=5, c='#1f77b4',zorder=-1)

def init():

scat_curr.set_offsets(np.c_[vertices[0,0], vertices[0,1]])

scat_dots.set_offsets(np.c_[vertices[0,0], vertices[0,1]])

return scat_curr, scat_dots

def animate(i):

scat_curr.set_offsets(np.c_[points[i,0], points[i,1]])

scat_dots.set_offsets(np.c_[points[:i,0], points[:i,1]])

ax.legend([scat_curr],['iter i = {a}'.format(a=i)], loc='upper left')

return scat_curr, scat_dots

anim = animation.FuncAnimation(fig, animate, init_func=init, frames=dots, interval=10)

Writer = animation.writers['ffmpeg']

writer = Writer(fps=15, metadata=dict(artist='Me'), bitrate=1800)

anim.save('some_nice_triforces.mp4', writer=writer)

這使：

https://i.stack.imgur.com/6X68l.gif

如果您有任何問題，我會添加更多評論，但由于這主要是您自己在這里的工作，我相信您會發現您所嘗試的遠比應該做的復雜:)。希望這可以幫助。

反對回復 2022-10-25

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Matplotlib 動畫為每一幀繪制相同的東西

Matplotlib 動畫為每一幀繪制相同的東西

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