Python tkinter库之Canvas自定义直线函数画随机色彩圆盘

create_line() 需要两个点的坐标，若线段的一个端点作定点，另一个端点作某种运动，写两个点的坐标比较麻烦。如下图自定义一个画直线函数，以角度和长度为变量来作图相对要方便一些：

代码如下： 同样的时间间隔，看上去 Line1()会比Line2() “转得”快2倍，角速度前者是后者的2倍。

import tkinter as tk
import pyautogui as ag
import random
from time import sleep as Delay
from math import sin
from math import cos
from math import pi

def Window_Open(W, H):
    X, Y = ag.size()
    winSize = str(W)+"x"+str(H)
    winPos = winSize + "+" + str((X - W) // 2)
    winPos += "+" + str((Y - H) // 2)
    win.geometry(winPos)
    win.resizable(False, False)
    title = u'桌面分辨率：' + str(X) + "x" + str(Y)
    title += ' ' * 5 + u'窗体大小：' + winSize
    win.title(title)
    win.update()

def Line1(x,y,d,rad=0,c='black'):
    "x,y 起始点坐标，d=长度，rad=与水平线夹角"
    coord = x,y,x + d * cos(pi*rad/180),y - d * sin(pi*rad/180)
    tCanvas.create_line(coord,fill=c)

def Line2(x,y,r,rad=0,c='black'):
    "x,y 线段中点坐标，r=半长，rad=与水平线夹角"
    coord = (x + r * cos(pi*rad/180),y - r * sin(pi*rad/180),
            x - r * cos(pi*rad/180),y + r * sin(pi*rad/180))
    tCanvas.create_line(coord,fill=c)

if __name__ == '__main__':
    
    win = tk.Tk()
    Window_Open(480,480)
    tCanvas = tk.Canvas(win, width=win.winfo_width(), height=480, bg='white')
    tCanvas.pack(side="top")

    Color = ['red','blue','green','magenta','navy','lawngreen','orange']
    for i in range(20):
        for r in range(0,360):
            c = random.choice(Color)
            Line1(240,240,200,r,c)
        tCanvas.update()
        Delay(0.05)

    Delay(2)
    
    for i in range(20):
        for r in range(0,180):
            c = random.choice(Color)
            Line2(240,240,200,r,c)
        tCanvas.update()
        Delay(0.05)

    win.mainloop()

效果图：