• yodayoda230

    Cheers. Just been playing it :)

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  • yodayoda230

    Can't wait for the game! :)

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  • yodayoda230

    Agree with eliskan on the double-quote issue.

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  • yodayoda230

    I can't reproduce error. (Ipad3, 6.1.3 ios)

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  • yodayoda230

    The (pseudo)code snippet there:
    def ccw(A,B,C):
    return (C.y-A.y) * (B.x-A.x) > (B.y-A.y) * (C.x-A.x)

    Return true if line segments AB and CD intersect

    def intersect(A,B,C,D):
    return ccw(A,C,D) != ccw(B,C,D) and ccw(A,B,C) != ccw(A,B,D)

    Looks pretty interesting(and pretty concise!) I will try that.

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  • yodayoda230

    Thanks will look into it. I have a Marware carbon fibre case which is really good and was £20, so I am a bit loath to change it!
    (P.s. it's not REAL carbon fibre;)

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  • yodayoda230

    Okay Coder123, that's slightly easier! :)

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  • yodayoda230

    This sorta works...
    <pre>
    #line1...
    xd= line1[2]-line1[0]
    yd= line1[3]-line1[1]
    g1=yd/xd
    c1=line1[1]-(g1*line1[0])
    #formula is y= g1 * x + c1

    #line2...
    xd2= line2[2]-line2[0]
    yd2= line2[3]-line2[1]
    g2=yd2/xd2
    c2 = line2[1] - (g2 * line2[0])
    #formula is y= g2 * x + c2

    both formulas will be equal at the intersection,

    i.e. one minus the other equals zero

    (g1 * x) + c1 - (g2 * x) - c2 = 0

    #solve for x...
    xinter = (c2-c1) / (g1-g2)

    but is xinter somewhere in the correct range?

    eg the range of one of the lines x bounds

    note: needs work as needs to limit to overlapping x range

    if xinter in range(line1[0],line1[2]):
    return True
    else:
    return False
    </pre>

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  • yodayoda230

    I just sketched this out using linear equations and it worked, and it seems like others on the web do the same - find the point where both linear equations equal each other ( or if they don't, then your lines don't intersect)
    Nice example here :
    http://keisan.casio.com/has10/SpecExec.cgi?id=system/2006/1223519249
    But wonder if something more elegant using the "in" function for rectangles might work...hmmm

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  • yodayoda230

    Thanks, this looks very interesting. You get an A* for working this out! :)

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