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python tkinter canvas 显示图片的示例

2019-11-25 12:45:42
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先来看一下该方法的说明

create_image(position, **options) [#]Draws an image on the canvas.positionImage position, given as two coordinates.**optionsImage 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 = Noneim = 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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