[Tutor] plotting pixels

[Bill Allen]

On Sat, Sep 18, 2010 at 9:26 PM, Bill Allen <wallenpb at gmail.com> wrote:

>
>
>> Digging a little deeper it seems the idiomatic way to do this in Python
>> is to use PIL the Python Imaging Library to create a GIF or bitmap
>> image and then insert that into Tkinters cancvas as an image object.
>>
>> The Pil ImageDraw class has a point() ethod
>>
>> I've never tried this but it is described in Grayson's (now out of print?)
>>
>> book on Tkinter where he uses it to draw a Mandelbrot....
>> The book may be available online these days...
>>
>> Nowdownloadall.com seems to have it although I've no idea
>> of the legality of it!
>>
>> HTH,
>>
>> Alan G.
>>
> Yes, to create a gif or a bmp from the iteration results and then to
> display that at the end of the run is by far the most efficient way of
> producing Mandelbrot and related sets.  I have actually done it that way
> before.   I just have always had a strange preference to see the set as it
> is being produced, which is far from efficient.  Kind of a very elaborate
> progress bar!  Anyway, I have no real complaints about the Tk canvas
> methods.  It has always just been a pet peeve of mine when something as
> basic and simple as plotting a pixel is missing.  My complaint on this goes
> way back to the ancient days when I had to figure out how to write a
> plot_pixel primitive in x86 assembler and then build a graphics library of
> my own so I could have pixel based graphics on my old monochrome IBM XT
> clone that had a Hercules graphics card in it.  Those were the days!
> Mandelbrot sets in 4 shades of amber-monochrome!    ;-)   I will check out
> that book you referenced.   I appreciate everybody's feedback on this.
>
> -Bill
>
>
> I found this code on the web.  It creates a 100x100 tk.photoimage  and
fills it with a radom colored pixels then displays it.  It seems to me that
I should be able to adapt this to what I am trying to acomplish.  The only
difference in the way I am filling the tk.photoimage object.  I ran this
under Python 3.1.2 with success.  I believe the '#%02x%02x%02x' is the
format for an image.   It is a color photoimage, but I am presuming that if
written directly out to a file this would not actually produce a valid, bmp,
gif, pgn, etc.  Correct?   This does seem to be a reasonable solution that
is a pure Tk solution.  Also it works in Python 3x, whereas the PIL library
has not yet been released for 3x.   I have not mentioned it before, but
using Python 3x only is also one of my requirement, though self-imposed.
Can anyone help me better understand this part of the code below?
self.i.put('#%02x%02x%02x' % tuple(color),(row,col))

import tkinter, random
class App:
    def __init__(self, t):
        self.i = tkinter.PhotoImage(width=100,height=100)
        colors = [[random.randint(0,255) for i in range(0,3)] for j in
range(0,10000)]
        row = 0; col = 0
        for color in colors:
            self.i.put('#%02x%02x%02x' % tuple(color),(row,col))
            col += 1
            if col == 100:
                row +=1; col = 0
        c = tkinter.Canvas(t, width=100, height=100); c.pack()
        c.create_image(0, 0, image = self.i, anchor=tkinter.NW)

t = tkinter.Tk()
a = App(t)
t.mainloop()
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