使用Python tkinter画布的上标问题 [英] Problems with superscript using Python tkinter canvas
问题描述
我试图使用canvas.create_text(...)来向图形添加文本。我使用unicode在以下方式有点成功:
I am trying to use canvas.create_text(...) to add text to a drawing. I have been somewhat successful using unicode in the following way:
mytext = u'U\u2076' #U^6
canvas.create_text(xPos,yPos,text = mytext, font = ("Times","30")
canvas.pack()
它可以工作,但是当增加字体大小时,上标4,5,6,7,8,9,0不会增加大小。工作,我假设它是相同的下标。此外,当我保存画布作为后记,问题上标已经走了...但是当我打印出保存的图像,上标返回。
It works, but when increasing the font size, superscripts 4,5,6,7,8,9,0 do not increase in size. Only 1,2,3 work. I'm assuming it's the same for subscripts. Also, when I save the canvas as a postscript, the problem superscripts are gone...but when I print out that saved image, the superscripts return.
我只是完全错了我的方法吗?我只是希望使这项工作,所以任何帮助将非常感谢你。
Am I just completely wrong with my approach? I'm just looking to make this work so any help would be greatly appreciated. Thank you.
推荐答案
您的问题来自于在您的平台和您的字体中处理Unicode
正如在维基百科:上标1,2和3以前在拉丁语-1
中处理,因此得到不同的字体支持。
Your problem comes from the handling of Unicode on your platform and in your fonts. As explained on wikipedia : superscript 1,2 and 3 where previously handled in Latin-1 and thus get different support in fonts.
我没有注意到固定大小的问题,但是在大多数字体上(在Linux和MacOS上),1,2,3都没有与4-9正确对齐。
I did not notice fixed size issue, but on most fonts (on Linux and MacOS), 1,2,3 are not properly aligned with 4-9.
我的建议是选择一个符合你需要的字体(你可以看看DejaVu系列,提供libre高品质的字体)。
My advice would be to select a font that match your need (you may look at DejaVu family, which provide libre high quality fonts).
这里是一个小应用程序,用于说明处理不同字体或大小的上标。
Here is a litte application to illustrate the handling of superscripts with different fonts or size.
from Tkinter import *
import tkFont
master = Tk()
canvas = Canvas(master, width=600, height=150)
canvas.grid(row=0, column=0, columnspan=2, sticky=W+N+E+S)
list = Listbox(master)
for f in sorted(tkFont.families()):
list.insert(END, f)
list.grid(row=1, column=0)
font_size= IntVar()
ruler = Scale(master, orient=HORIZONTAL, from_=1, to=200, variable=font_size)
ruler.grid(row=1, column=1, sticky=W+E)
def font_changed(*args):
sel = list.curselection()
font_name = list.get(sel[0]) if len(sel) > 0 else "Times"
canvas.itemconfig(text_item, font=(font_name,font_size.get()))
#force redrawing of the whole Canvas
# dirty rectangle of text items has bug with "superscript" character
canvas.event_generate("<Configure>")
def draw():
supernumber_exception={1:u'\u00b9', 2:u'\u00b2', 3:u'\u00b3'}
mytext =""
for i in range(10):
mytext += u'U'+ (supernumber_exception[i] if i in supernumber_exception else unichr(8304+i))+" "
return canvas.create_text(50, 50,text = mytext, anchor=NW)
text_item = draw()
list.bind("<<ListboxSelect>>", font_changed)
font_size.trace("w", font_changed)
font_size.set(30)
master.grid_columnconfigure(0, weight=0)
master.grid_columnconfigure(1, weight=1)
master.grid_rowconfigure(0, weight=1)
master.grid_rowconfigure(1, weight=0)
master.mainloop()
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