[reportlab-users] Sunday pleasures: 12 queens animated

[Dinu Gherman]

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Andy Robinson:

> I just checked in a new canvas method setPageDuration, and
> modified tools\pythonpoint\demos\pythonpoint.xml to use it.
> You can specify a 'wait time' in seconds for all subsequent
> pages.  If - and only if - Acrobat Reader is in full screen
> mode, it will auto-advance to the next page after that many
> seconds.

Cool, but it doesn't quite work on my box. I tried ints and floats
as arguments to setPageDuration(), but no effect, although the PDF
source has the appropriate dictionary entry /D. The full screen
option is correctly used, although the method is still contains
a trailing 0: showFullScreen0().

> You can tell me when I can download the 'animated' 12 queens, and
> whether Acrobat Reader catches fire at 24 frames per second :-)

I've attached a standalone generating script for 8 queens to illu-
strate the effect. Does the resulting PDF animate on your box?


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#!/usr/bin/env python

## from addons import *


def make_PDF():
    "Create a PDF file with all solutions to the N-queens problem."
    
    from reportlab.lib import colors
    from reportlab.pdfgen.canvas import Canvas

    a = 100
    n = 8

    # setup canvas    
    c = Canvas('8queens.pdf')
    c.setPageSize((n*a, n*a))
    c.showFullScreen0()
    c.setPageDuration(1.0)

    # create list of solutions    
    ## sols = n_queens(n, n)
    ## sols = remove_mirror_solutions(sols)
    sols = [[0, 4, 7, 5, 2, 6, 1, 3], 
            [0, 5, 7, 2, 6, 3, 1, 4], 
            [1, 3, 5, 7, 2, 0, 6, 4], 
            [1, 4, 6, 0, 2, 7, 5, 3], 
            [1, 4, 6, 3, 0, 7, 5, 2], 
            [1, 5, 0, 6, 3, 7, 2, 4], 
            [1, 5, 7, 2, 0, 3, 6, 4], 
            [1, 6, 2, 5, 7, 4, 0, 3], 
            [1, 6, 4, 7, 0, 3, 5, 2], 
            [2, 4, 1, 7, 0, 6, 3, 5], 
            [2, 4, 7, 3, 0, 6, 1, 5], 
            [2, 5, 1, 4, 7, 0, 6, 3]]
    print "#solutions:", len(sols)

    # add one page per solution to the canvas    
    na = n*a
    for sol in sols:
        # draw grid
        c.setFillColor(colors.gray)
        for i in range(0, na, a):
            c.line(0, i, na, i)
            c.line(i, 0, i, na)
        # draw queens
        c.setFillColor(colors.red)
        for i in range(len(sol)):
            c.rect(i*a, sol[i]*a, a, a, fill=1)
        c.showPage()
    
    c.save()


if __name__ == '__main__':
    make_PDF()

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Regards,

Dinu

--
Dinu C. Gherman
......................................................................
"Any sufficiently advanced technology is indistinguishable
from magic." (Arthur C. Clarke)

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