[Tkinter-discuss] scrolled canvas ,strange problem

[contro opinion]

i have written a program in tkinter to draw stock  graph,there  are two
strange thing i  can't understand
the  attachment is  'AAU'  data  file(attachment 1).when you download it
,please  save it in  /tmp/AAU
there  is  a  scrolled  canvas  in  it ,

1.strang  long  line,please  see my  attachment.
i  have  see  my  data  ,my  formulation ,no wrong,but the line is so long!!

2.there is  no  motion  event reaction  in  the  right  of  canvas,only
motion event  reaction in the  left  of  canvas.
3.i have round function ,but  the output is still  more  fractions  than  2.





------------------ 原始邮件 ------------------
*发件人:* "John McMonagle"<jmcmonagle at velseis.com>;
*发送时间:* 2011年9月2日(星期五) 中午1:48
*收件人:* "1248283536"<1248283536 at qq.com>;
*抄送:* "Tkinter-discuss"<tkinter-discuss at python.org>;
*主题:* Re: [Tkinter-discuss] tkinter and cursor

On 02/09/11 13:59, 守株待兔 wrote:

>
> you can get a  figure  with the program, when you move mouse on the canvas
(figure),you can see the coordinate on the  right corner , i want to make it
in tkinter,there is no "move click in the canvas" event in tkinter,how to
make it in tkinter??
>

You can use the "<Motion>" event.  You also should be converting the
event.x and event.y to canvas coordinates.  This is especially important
when your canvas also includes scrollbars.


So, using your code from previous posts, from the myprint function onwards,



def  myprint(event):
    # convert the event coordinates to canvas coordinates
    x = canvas.canvasx(event.x)
    y = canvas.canvasy(event.y)

    # find the poistion in the top right corner of your canvas widget
    # less a little bit so as to see the displayed text
    cx = canvas.winfo_width() - 10
    cy = 10

    # delete previous displayed text
    canvas.delete('coords')

    # display the coordinates
    canvas.create_text(cx,cy,anchor=E, text='%d,%d' % (x,y), tags='coords')

canvas.bind("<Motion>", myprint)

root.mainloop()


This will display the canvas coordinate in the top right corner of the
canvas widget.

Suggested reading on Canvas:

http://effbot.org/tkinterbook/canvas.htm

Suggested reading on events:

http://effbot.org/tkinterbook/tkinter-events-and-bindings.htm

Regarsd,

John

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