Python Tkinter移动

Question

I have numerous lines on a graph, datalines, horizontal divider line, day and month indicator lines, etc. I have typically, probably until now, been adding lines in this fashion:

canvas_1.create_line(x1,y1,x2,y2)

I now have simple problem. I want to also add in a vertical scale to show how much above and below zero the line is...quite natural. The datafile is big, roughly 12,000 data units and growing so I have everything setup using the left and right arrow keys to allow scrolling through the data. It works great but I haven't added in the vertical scale yet. Right now everything moves:

canvas_1.move(ALL,x,y)

When I add in the vertical scale I don't want the vertical scale to move. I know by using the move(ALL) that the vertical scale will also move.

What do I have to change in order to get the vertical scale so it won't move? Do I have to go out and 'label' all create_line statements???

line1 = canvas_1.create_line....

If so when I have mega reference of lines that I want to move how do I put them into the move statement. Do I have to put all the labels into a list or what? I kinda really lost in the thought process on this concept.

I fess I'm still looking into scrollbars but haven't quite had any good luck with them yet and I have a feeling I will still have the same problem to be dealt with.

Answer 1

The move method takes either an id of a single object, or a tag that represents zero or more objects. ALL is a built-in tag (literally, the string "all" ) that refers to everything on the canvas.

So, to use the move method without moving the scale, give everything except the scale a unique tag, and then use that tag for the move command.

canvas_1.create_line(x1,y1,x2,y2, tags=("lines",))
...
canvas_1.move("lines")

For more information about tags, see http://effbot.org/tkinterbook/canvas.htm#item-specifiers