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  • extend a line - improved!

    From Hul Tytus@21:1/5 to All on Mon Feb 26 23:11:49 2018
    comp.graphics.algorithms
    extending a line in xyz notation

    I'm in need of a routine for extending a line as shown by the beginnings
    below. As can be seen, it is the merest start. Anyone have some code that does the job or maybe a suggestion or two? Would appreciate it.

    Hul

    /*
    extend a line dst distance from pt1 perpendicular to line to pt2 and in
    the plane and direction defined by pt3. res[] is for the point at the
    end of the extended line.
    */
    whatev(pt1, pt2, pt3, dst, res)
    double pt1[], pt2[], pt3[];
    double dst, res[];
    {

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  • From =?UTF-8?Q?Hans-Bernhard_Br=c3=b6ker@21:1/5 to All on Fri Mar 2 15:40:19 2018
    Am 27.02.2018 um 00:11 schrieb Hul Tytus:

    /*
    extend a line dst distance from pt1 perpendicular to line to pt2 and in
    the plane and direction defined by pt3. res[] is for the point at the
    end of the extended line.
    */
    whatev(pt1, pt2, pt3, dst, res)
    double pt1[], pt2[], pt3[];
    double dst, res[];
    {

    While it's an improvement that this time round you at least found the
    right newsgroup, the problem statement is still lacking clarity to a
    degree that makes it almost incomprehensible.

    For starters, there is no "plane defined by a point". And "line to pt2"
    is equally vague: line from where to pt2?

    In other words: please try again, and try to be less cryptic about it.

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