Graphics.py，我想在滑鼠點擊時創建三個獨立的物件

所以這就是我到目前為止所擁有的，但我想做到這一點，我可以在視窗中單擊三次，并在滑鼠單擊點處顯示三個不同顏色的圓圈。

from Graphics import *


def main():
    win = GraphWin("ball", 400, 400)
    win.setBackground('black')  
    
    while True:
        point = win.getMouse()
        if point.x > 20 and point.y > 20:             
            circ_1 = Circle(Point(point.x,point.y), 20)
            circ_1.setFill("white")
            circ_1.draw(win)
            continue        
        
        if point.x > 20 and point.y > 20:             
            circ_2 = Circle(Point(point.x,point.y), 20)
            circ_2.setFill("blue")
            circ_2.draw(win)    
            continue
        
        if point.x > 20 and point.y > 20:             
            circ_3 = Circle(Point(point.x,point.y), 20)
            circ_3.setFill("yellow")
            circ_3.draw(win)    
            continue        
       
    win.getMouse()
    win.close()    
main()

uj5u.com熱心網友回復：

您可以將顏色保留在串列中，并使用變數來顯示當前圓圈中使用的顏色。繪制圓圈后，您可以更改索引以使用下一個圓圈中的下一種顏色。當它使用最后一種顏色時，將索引移動到 0 以再次使用第一種顏色

from graphics import *


def main():
    colors = ['white', 'blue', 'yellow']
    color_index = 0
    
    win = GraphWin("ball", 400, 400)
    win.setBackground('black')  
    
    while True:
        point = win.getMouse()
        if point.x > 20 and point.y > 20:
            color = colors[color_index]
            print('color:', color)
            
            circ = Circle(Point(point.x,point.y), 20)
            circ.setFill(color)
            circ.draw(win)
            
            color_index  = 1
            if color_index >= len(colors):
                color_index = 0
       
    win.close()    

main()

但我不會使用while True回圈，而是bind()將左鍵單擊分配給某些功能

from graphics import *

# global variables

colors = ['white', 'blue', 'yellow']
color_index = 0

win = None

def draw_circle(event):
    global color_index  # inform function to assign new value to global variable `color_index` instead of local variable `color_index`  because I will need this value when `mouse button` will run again this function

    print('event:', event)
    
    if event.x > 20 and event.y > 20:
        color = colors[color_index]
        print('color:', color)
        
        circ = Circle(Point(event.x, event.y), 20)
        circ.setFill(color)
        circ.draw(win)
        
        color_index  = 1
        if color_index >= len(colors):
            color_index = 0

def main():
    global win  # inform function to assign new value to global variable `win` instead of local variable `win` because I need this value in other function
    
    win = GraphWin("ball", 400, 400)
    win.setBackground('black')

    win.bind('<Button-1>', draw_circle)  # function's name without `()`
    
    win.getMouse()
    win.close()
    
main()

在檢查了一些示例之后，Graphics我看到它而不是使用while True而不是bind()

此版本使用w、b、鍵y來改變顏色和q退出程式。

它需要checkMouse而不是getMouse因為它必須同時使用checkKey并且getMouse會阻塞代碼。

from graphics import *

# global variables

current_color = 'white'
win = None

def draw_circle(event):
    print('event:', event)
    
    if event.x > 20 and event.y > 20:
       
        print('color:', current_color)
        
        circ = Circle(Point(event.x, event.y), 20)
        circ.setFill(current_color)
        circ.draw(win)

def main():
    global win  # inform function to assign new value to global variable instead of local variable
    global current_color
    
    win = GraphWin("ball", 400, 400)
    win.setBackground('black')

    while True:
        point = win.checkMouse()
        if point:
            draw_circle(point)
            
        key = win.checkKey()
        if key == 'w':
            current_color = 'white'
        elif key == 'y':
            current_color = 'yellow'
        elif key == 'b':
            current_color = 'blue'

        elif key == 'q':  # quit loop
            break
        
    win.close()
    
main()

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