supercanvas 0.1.1

tkinter simplified (and augmented) canvas

This package provides a supercanvas widget based on the original tkinter canvas. It provides a fast useable canvas with a usual cartesian coordinate system.

class object

>>> from supercanvas import *

Once package importation completed, you have to create a supercanvas the usual way.

r = tkinter.Tk()
c = supercanvas(r, bg="white", width=800, height=600)

origin and units

By default, origin is located at supercanvas's center and units are both 1 pixel (and axes are drawn in french style with arrows). You can change this with setOrigin and setUnit methods:

c.setUnit(80, 100)
c.setOrigin(50, 200)

supercanvas items

supercanvas provides, for the moment, two items to draw Point and Line:

• drawPoint method create a point at the desired coords.

f = lambda x:x**2
x = 3
c.drawPoint(x, f(x), fill="red", outline="red")

It's based on create_oval so you can pass each option related to Oval object.

• drawLine method create a line with a list of coords.

c.drawLine([(-2, 2), (-1, 0), (0, 3)], fill="blue", width=3)

drawLine also supports a flat list of coords:

c.drawLine([-2, 2, -1, 0, 0, 3], fill="blue", width=3)

gives the same line.

grab/release background

You can move the whole supercanvas content in grabing / realeasing the background. It will refresh coords.

supercanvas options

• axes

passing axes=False to supercanvas options disable axes, default is True. For the moment, you cannot change axes style...

• ticks

passing ticks=False to supercanvas options disable ticks, default is True. For the moment, ticks are 1-unit separated...

• follow

passing follow=False to supercanvas options disable cursor follow with coords, default is True.

full example

from supercanvas import *
import math
r = tkinter.Tk()

c = supercanvas(r, bg="white", width=800, height=600, ticks=False)
c.setUnit(100, 100)

f=lambda x:math.cos(x)
g=lambda x:math.sin(x)

p = .1
a, b = -3, 3
x = a
listePointsF = []
listePointsG = []
for i in range(int(1 + (b - a) / p)):
    # creating points 
    c.drawPoint(x, f(x), fill="red", outline="red")
    # two lists
    # function f with tuples
    listePointsF += (x, f(x))
    # function g with flat list
    listePointsG += [x]+[g(x)]
    x += p

# drawings of the two curves
c.drawLine(listePointsF, fill="green")
c.drawLine(listePointsG, fill="blue", width=3)

# balancing canvas on the root
c.pack(expand=True)

# q to quit
r.bind("<q>", quit)
tkinter.mainloop()

further

Much much more!

about

supercanvas is rather an attempt to publish on the PyPi packages index than a fully completed python project, I do not recommend supercanvas usage for professionnal use. You have to consider this package as an experiment.