我创建了一个简短的脚本来在Tkinter画布元素中显示照片。我将canvas元素的大小设置为与照片大小相同,但是当我启动窗口时,无论我多大程度地展开窗口,我通常只会看到图像的一小部分。
当我打印出用于设置画布大小的图像大小时,此大小显示(922,614),而当我在画布上记录鼠标点击时,右下角就像(500,300)。我的代码如下。我应该更改什么,以使画布与图像大小相同,并完全显示图像?
class AppWindow(Frame):
def __init__(self, parent, list_of_files, write_file):
Frame.__init__(self, parent)
self.parent = parent
...
self.image = None
self.canvas = None
self.index = -1
self.loadImage()
self.initUI()
self.resetCanvas()
def initUI(self):
self.style = Style()
self.style.theme_use("default")
self.pack(fill=BOTH, expand=1)
...
self.canvas = Tkinter.Canvas(self, width = self.image.width(), height = self.image.height())
def loadImage(self):
self.index += 1
img = cv2.imread(self.list_of_files[self.index])
img = cv2.resize(img, (0,0), fx = IMAGE_RESIZE_FACTOR, fy = IMAGE_RESIZE_FACTOR)
b, g, r = cv2.split(img)
img = cv2.merge((r,g,b))
im = Image.fromarray(img)
self.image = ImageTk.PhotoImage(image=im)
def resetCanvas(self):
self.canvas.create_image(0, 0, image=self.image)
self.canvas.place(x = 0, y = 0, height = self.image.height(), width = self.image.width())
以下是显示照片及其在Tkinter画布中的显示方式的屏幕截图:
这是我到目前为止所尝试的内容:
self.canvas = Tkinter.Canvas(self, width = self.image.width()*2, height = self.image.height()*2)
这样可以使画布更大(我可以说,因为我在画布上有一些绘图功能),但是图像保持相同的小尺寸,而不是显示整个图像cv2.imshow()
显示cv2格式图像时,我看到了完整的图像,因此切断图像部分的cv2
不是import Tkinter
import Image, ImageTk
from Tkinter import Tk, BOTH
from ttk import Frame, Button, Style
import cv2
import os
import time
import itertools
IMAGE_RESIZE_FACTOR = .3
class AppWindow(Frame):
def __init__(self, parent):
Frame.__init__(self, parent)
self.parent = parent
self.loadImage()
self.initUI()
def loadImage(self):
img = cv2.imread("w_4131.jpg")
img = cv2.resize(img, (0,0), fx = IMAGE_RESIZE_FACTOR, fy = IMAGE_RESIZE_FACTOR)
b, g, r = cv2.split(img)
img = cv2.merge((r,g,b))
im = Image.fromarray(img)
self.image = ImageTk.PhotoImage(image=im)
def initUI(self):
self.style = Style()
self.style.theme_use("default")
self.pack(fill=BOTH, expand=1)
print "width and height of image should be ", self.image.width(), self.image.height()
self.canvas = Tkinter.Canvas(self, width = self.image.width(), height = self.image.height())
self.canvas.pack()
self.canvas.create_image(0, 0, image=self.image)
def main():
root = Tk()
root.geometry("250x150+300+300")
app = AppWindow(root)
root.mainloop()
if __name__ == '__main__':
main()
。 我意识到上面的内容并不是一个完整的工作示例。我已经减少了脚本,现在运行它我仍然看到同样的问题:
Advertisements.cachedCategoriesByUrl = {};
Advertisements.getCategories = function(categoriesUrl) {
var cachedCategories = Advertisements.cachedCategoriesByUrl[categoriesUrl];
if(cachedCategories){
return cachedCategories;
} else {
var getCategories = $.ajax({
url: categoriesUrl,
data: { format: 'json' },
error: function(jqXHR, status, thrownError) {
=> I'd like to pass an empty array so the slot will show
ads with no targetting set.
However this doesn't seem to be working.
Do I need to do callback?
}
});
Advertisements.cachedCategoriesByUrl[categoriesUrl] = getCategories;
return getCategories;
}
}
答案 0 :(得分:5)
当您将图像放在0,0的画布上时,它指定图像的中心的位置,而不是左上角。图像就在那里,只是你只看到了右下角。
在为坐标创建图像时添加anchor="nw"
以表示图像的左上角:
self.canvas.create_image(0, 0, image=self.image, anchor="nw")
至于画布与图像大小不同,我没有看到。图像看起来非常适合画布。