supercanvas 0.1.0

This package provides a supercanvas widget based on the original tkinter canvas. It provides a fast useable canvas for function drawing.

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.

cursor

The cursor gives you actual coords of its position. In the future, you will be able to toggle this feature.

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

full example

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

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