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超轻量级php框架startmvc

python tkinter canvas 显示图片的示例

更新时间:2020-07-06 14:42:02 作者:startmvc
先来看一下该方法的说明create_image(position,**options)[#]Drawsanimageonthecanvas.positionImageposition,givena

先来看一下该方法的说明


create_image(position, **options) [#]
Draws an image on the canvas.

position
Image position, given as two coordinates.
**options
Image options.
activeimage=
anchor=
Where to place the image relative to the given position. Default is CENTER.
disabledimage=
image=
The image object. This should be a PhotoImage or BitmapImage, or a compatible object (such as the PIL PhotoImage). The application must keep a reference to the image object.
state=
Item state. One of NORMAL, DISABLED, or HIDDEN.
tags=
A tag to attach to this item, or a tuple containing multiple tags.
Returns:
The item id.

关于image有两个重要的点要注意,一个是格式,第二是要保持持续引用

The image object. This should be a

1.This should be a PhotoImage or BitmapImage, or a compatible object (such as the PIL PhotoImage).

2.The application must keep a reference to the image object.

因此代码应该这样写,并且变量im应该是全局变量


image = Image.open("img.jpg") 
im = ImageTk.PhotoImage(image) 

canvas.create_image(300,50,image = im) 

但如果我就是想要在方法里调用怎么办?

那么可以提前声明全局变量


image = None
im = None

之后在方法里使用global来声明变量为全局变量

即:


def method():
 global image
 global im
 image = Image.open("img.jpg") 
 im = ImageTk.PhotoImage(image) 
 ...

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python tkinter canvas 显示图片