新手求助，通过滑块控制abc三个变量，来控制二次函数图像。,萌新交流区,萌新训练营,鱼C论坛

超级赛亚人哦哦 发表于 2020-8-5 20:57:28

新手求助，通过滑块控制abc三个变量，来控制二次函数图像。

import tkinter as tk
import matplotlib.pyplot as plt
import numpy as np
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg, NavigationToolbar2Tk
from matplotlib.figure import Figure
from mpl_toolkits import axisartist

window = tk.Tk()
window.title("二次函数")
window.geometry("600x600")

figure = Figure(figsize=(5, 4), dpi=100)
axes = axisartist.Subplot(figure, 111)
figure.add_axes(axes)
canvas = FigureCanvasTkAgg(figure, master=window)
toolbar = NavigationToolbar2Tk(canvas, window)
toolbar.update()
canvas.get_tk_widget().pack()
l = tk.Label(window,bg = "yellow",width = 20,text = "一元二次函数")
l.pack()

def Repaint(source):
   a_value = a_scale.get()
   b_value = b_scale.get()
   c_value = c_scale.get()
   # 计算绘图中线
   mid = 0
   if a_value != 0:
            mid = -b_value / 2 / a_value
   x = np.linspace(mid - 10, mid + 10, 200)
   y = np.zeros(x.shape)
   for i in range(x.shape):
            y = a_value * x ** 2 + b_value * x + c_value
   y_min, y_max = -10, 10
   if a_value > 0:
            y_min, y_max = min(y) - 5, 50
   elif a_value < 0:
            y_min, y_max = -50, max(y) + 5

ax = plt.gca()
ax.spines["right"].set_color("none")
ax.spines["top"].set_color("none")
ax.xaxis.set_ticks_position("bottom")
ax.yaxis.set_ticks_position("left")
ax.spines["bottom"].set_position(("data",0))
ax.spines["left"].set_position(("data",0))

a_scale = tk.Scale(window,label = "a",from_ = -10,to = 10,orient = tk.HORIZONTAL,
         length = 200,showvalue = 0,tickinterval = 2,resolution = 1,command = Repaint)
b_scale = tk.Scale(window,label = "b",from_ = -10,to = 10,orient = tk.HORIZONTAL,
         length = 200,showvalue = 0,tickinterval = 2,resolution = 1,command = Repaint)
c_scale = tk.Scale(window,label = "c",from_ = -10,to = 10,orient = tk.HORIZONTAL,
         length = 200,showvalue = 0,tickinterval = 2,resolution = 1,command = Repaint)
a_scale.pack()
b_scale.pack()
c_scale.pack()

a = a_scale.get()
b = b_scale.get()
c = c_scale.get()

l = tk.Label(window,text = "二次函数图像",font = ("Arial",12),width = 15,height = 2)
l.pack()

plt.show()

window.mainloop()

超级赛亚人哦哦 发表于 2020-8-5 20:58:58

兄弟们为什么我写完的代码，会出现两张只有坐标的图，并没有一次函数。

永恒的蓝色梦想 发表于 2020-8-5 20:59:08

超级赛亚人哦哦 发表于 2020-8-5 21:05:27

怎么发照片呀。。

超级赛亚人哦哦 发表于 2020-8-5 21:06:11

liuzhengyuan 发表于 2020-8-5 21:08:32

超级赛亚人哦哦发表于 2020-8-5 21:05
怎么发照片呀。。

【技巧】新鱼油怎么传图片？
https://fishc.com.cn/thread-168190-1-1.html
(出处: 鱼C论坛)

Hello. 发表于 2020-8-5 21:08:57

您现在无权限上传本地图片

但我们需要看图片解决问题，请您根据以下步骤正确上传图片！
static/image/hrline/1.gif
图床地址：路过图床 - 免费图片上传, 专业图片外链, 免费公共图床
http://m.qpic.cn/psc?/V1046bnt0Whegz/fFWTTr*vfq2.Z2Ez3gOL3YrkNNI6nsAV404E460eFwTWRhMzPWnEDfBP.zkLauZ9.9*n.uDHpbS4nyangdo3gw!!/b&bo=agcPAwAAAAADB0M!&rf=viewer_4&t=5

超级赛亚人哦哦 发表于 2020-8-5 21:30:12

https://imgchr.com/i/aybNHf

超级赛亚人哦哦 发表于 2020-8-5 21:30:48

Hello. 发表于 2020-8-5 21:08
您现在无权限上传本地图片

但我们需要看图片解决问题，请您根据以下步骤正确上传图片！

谢谢

超级赛亚人哦哦 发表于 2020-8-5 21:31:32

liuzhengyuan 发表于 2020-8-5 21:08
【技巧】新鱼油怎么传图片？
https://fishc.com.cn/thread-168190-1-1.html
(出处: 鱼C论坛)

谢谢

超级赛亚人哦哦 发表于 2020-8-5 21:33:12

https://imgchr.com/i/aybYut

超级赛亚人哦哦 发表于 2020-8-5 21:35:15

以上是最后跑出来的图

超级赛亚人哦哦 发表于 2020-8-5 21:39:31

https://imgchr.com/i/ayLgtU

超级赛亚人哦哦 发表于 2020-8-5 21:40:44

这个是最后想要的

超级赛亚人哦哦 发表于 2020-8-5 21:41:45

兄弟萌可以解答一下吗

sunrise085 发表于 2020-8-5 23:06:04

本帖最后由 sunrise085 于 2020-8-6 19:27 编辑

看39行到55行
import tkinter as tk
import matplotlib.pyplot as plt
import numpy as np
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg, NavigationToolbar2Tk
from matplotlib.figure import Figure
from mpl_toolkits import axisartist

window = tk.Tk()
window.title("二次函数")
window.geometry("600x600")

figure = Figure(figsize=(5, 4), dpi=100)
axes = axisartist.Subplot(figure, 111)
figure.add_axes(axes)
canvas = FigureCanvasTkAgg(figure, master=window)
toolbar = NavigationToolbar2Tk(canvas, window)
toolbar.update()
canvas.get_tk_widget().pack()
l = tk.Label(window,bg = "yellow",width = 20,text = "一元二次函数")
l.pack()

def Repaint(source):
   a_value = a_scale.get()
   b_value = b_scale.get()
   c_value = c_scale.get()
   # 计算绘图中线
   mid = 0
   if a_value != 0:
         mid = -b_value / 2 / a_value
   x = np.linspace(mid - 10, mid + 10, 200)
   y = np.zeros(x.shape)
   for i in range(x.shape):
         y = a_value * x ** 2 + b_value * x + c_value
   y_min, y_max = -10, 10
   if a_value > 0:
         y_min, y_max = min(y) - 5, 50
   elif a_value < 0:
         y_min, y_max = -50, max(y) + 5
#这里添加这四句，第一句清除原有图形，第二句根据新的xy值图形，第三句和第四句重绘图形。
   axes.clear()
   axes.plot(x,y)
   figure.canvas.draw()
   figure.canvas.flush_events()

#下面这几句导致又绘制了一张图
'''ax = plt.gca()
ax.spines["right"].set_color("none")
ax.spines["top"].set_color("none")
ax.xaxis.set_ticks_position("bottom")
ax.yaxis.set_ticks_position("left")
ax.spines["bottom"].set_position(("data",0))
ax.spines["left"].set_position(("data",0)) '''

a_scale = tk.Scale(window,label = "a",from_ = -10,to = 10,orient = tk.HORIZONTAL,
         length = 200,showvalue = 0,tickinterval = 2,resolution = 1,command = Repaint)
b_scale = tk.Scale(window,label = "b",from_ = -10,to = 10,orient = tk.HORIZONTAL,
         length = 200,showvalue = 0,tickinterval = 2,resolution = 1,command = Repaint)
c_scale = tk.Scale(window,label = "c",from_ = -10,to = 10,orient = tk.HORIZONTAL,
         length = 200,showvalue = 0,tickinterval = 2,resolution = 1,command = Repaint)
a_scale.pack()
b_scale.pack()
c_scale.pack()

a = a_scale.get()
b = b_scale.get()
c = c_scale.get()

l = tk.Label(window,text = "二次函数图像",font = ("Arial",12),width = 15,height = 2)
l.pack()

plt.show()

window.mainloop()

sunrise085 发表于 2020-8-6 19:28:35

今天我又看了一下昨天的这个程序，找到重绘曲线的方法了。我把16楼的答案更新了。可以直接用了

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新手求助，通过滑块控制abc三个变量，来控制二次函数图像。