如何更新画布上的图像? [英] How to update an image on a Canvas?
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问题描述
这是我遇到问题的代码的本质:
This is the essence of the code I'm having trouble with:
camelot = Canvas(main, width = 400, height = 300)
camelot.grid(row = 0, column = 0, rowspan = 11, columnspan = 3)
MyImage = PhotoImage(file = "sample1.gif")
camelot.create_image(0, 0, anchor = NW, image = MyImage)
这是在开始时运行的.我稍后想在另一个函数中做的是将 "sample1.gif"
替换为 "sample2.gif"
,并且可能稍后将其替换为 <代码>sample3.gif".我被卡住了,到目前为止我一直在尝试的任何东西都没有奏效.
This is run at the beginning. What I want to do on later in another function is replace "sample1.gif"
by "sample2.gif"
, and, possibly later on, replace that in turn by "sample3.gif"
. I'm stuck and nothing I've been trying has worked so far.
推荐答案
将图像添加到画布:
self.image_on_canvas = self.canvas.create_image(0, 0, image = ...)
更改图片:
self.canvas.itemconfig(self.image_on_canvas, image = ...)
完整示例:
from Tkinter import *
#----------------------------------------------------------------------
class MainWindow():
#----------------
def __init__(self, main):
# canvas for image
self.canvas = Canvas(main, width=60, height=60)
self.canvas.grid(row=0, column=0)
# images
self.my_images = []
self.my_images.append(PhotoImage(file = "ball1.gif"))
self.my_images.append(PhotoImage(file = "ball2.gif"))
self.my_images.append(PhotoImage(file = "ball3.gif"))
self.my_image_number = 0
# set first image on canvas
self.image_on_canvas = self.canvas.create_image(0, 0, anchor = NW, image = self.my_images[self.my_image_number])
# button to change image
self.button = Button(main, text="Change", command=self.onButton)
self.button.grid(row=1, column=0)
#----------------
def onButton(self):
# next image
self.my_image_number += 1
# return to first image
if self.my_image_number == len(self.my_images):
self.my_image_number = 0
# change image
self.canvas.itemconfig(self.image_on_canvas, image = self.my_images[self.my_image_number])
#----------------------------------------------------------------------
root = Tk()
MainWindow(root)
root.mainloop()
示例中使用的图像:
ball1.gif ball2.gif ball3.gif
ball1.gif ball2.gif ball3.gif
结果:
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