Tkinter在单击鼠标时更新多边形点 [英] Tkinter update polygon points on mouse click

问题描述

我想在每次单击鼠标时更新多边形.当通过鼠标单击获得新位置时，以下代码重新绘制新多边形.我想更新多边形或获取新的多边形(删除旧的多边形).怎么做.这是完整的建议.使用python的Tkinter库.

I want to update the polygon on each mouse click. The below code redraw new polygon when new position is obtained from mouse click. I want to update the polygon or get new one (delete old one). How to do it. Here is the complete as suggested. Tkinter library of python is used.

import math
from Tkinter import *
from PIL import Image, ImageDraw
import Image, ImageTk

coord=[]  # for saving coord of each click position

Dict_Polygons={}   # Dictionary for saving polygons
list_of_points=[]

# Function to get the co-ordianates of  mouse clicked position
def draw_polygons(event):
    mouse_xy = (event.x, event.y)
    func_Draw_polygons(mouse_xy)  


# Function to draw polygon
def func_Draw_polygons(mouse_xy):
    center_x, center_y = mouse_xy

    #draw dot over position which is clicked
    x1, y1 = (center_x - 1), (center_y - 1)
    x2, y2 = (center_x + 1), (center_y + 1)
    canvas.create_oval(x1, y1, x2, y2, fill='green', outline='green', width=5)

    # add clicked positions to list
    list_of_points.append(mouse_xy)

    numberofPoint=len(list_of_points)
    # Draw polygon
    if numberofPoint>2:

        poly=canvas.create_polygon(list_of_points, fill='', outline='green', width=2)
        canvas.coords(poly,)

    elif numberofPoint==2 :
        print('line')
        canvas.create_line(list_of_points)
    else:
        print('dot')


  #  ImageDraw.ImageDraw.polygon((list_of_points), fill=None, outline=None)

    print(list_of_points)

##########################################################################
# Main function
if __name__ == '__main__':

        root = tk.Tk()
    # Input image
        img = Image.open("e.png")

    # Draw canvas for input image to pop up image for clicks
        filename = ImageTk.PhotoImage(img)
        canvas = Canvas(root,height=img.size[0],width=img.size[0])
        canvas.image = filename
        canvas.create_image(0,0,anchor='nw',image=filename)
        canvas.pack()
    # bind function to canvas to generate event
        canvas.bind("<Button 3>", draw_polygons)
        root.mainloop()

推荐答案

这是否使您更接近解决方案?每次将新点添加到列表时，它都会根据点列表重新绘制.

Does this get you any closer to your solution? It re-draws based on the list of points each time a new point is added to the list.

import math
#change to tkinter for python3
from Tkinter import *
#from PIL import Image, ImageDraw
#import Image, ImageTk

coord=[]  # for saving coord of each click position

Dict_Polygons={}   # Dictionary for saving polygons
list_of_points=[]
poly = None

# Function to get the co-ordianates of  mouse clicked position
def draw_polygons(event):
    mouse_xy = (event.x, event.y)
    func_Draw_polygons(mouse_xy)  


# Function to draw polygon
def func_Draw_polygons(mouse_xy):
    global poly, list_of_points
    center_x, center_y = mouse_xy
    canvas.delete(ALL)

    list_of_points.append((center_x, center_y))

    for pt in list_of_points:
        x, y =  pt
        #draw dot over position which is clicked
        x1, y1 = (x - 1), (y - 1)
        x2, y2 = (x + 1), (y + 1)
        canvas.create_oval(x1, y1, x2, y2, fill='green', outline='green', width=5)

    # add clicked positions to list


    numberofPoint=len(list_of_points)
    # Draw polygon
    if numberofPoint>2:
        poly=canvas.create_polygon(list_of_points, fill='', outline='green', width=2)
    elif numberofPoint==2 :
        print('line')
        canvas.create_line(list_of_points)
    else:
        print('dot')


  #  ImageDraw.ImageDraw.polygon((list_of_points), fill=None, outline=None)

    print(list_of_points)

##########################################################################
# Main function
if __name__ == '__main__':
    root = Tk()


    canvas = Canvas(root,height=200,width=200)

    canvas.pack()
    # bind function to canvas to generate event
    canvas.bind("<Button 3>", draw_polygons)
    root.mainloop()

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