Re: rotation aadlport

[Andreas Owen <iaowen hta fhz ch>]

hi

Lars Clausen wrote:
> On Thu, 2006-11-16 at 18:29 +0100, Andreas Owen wrote:
>
> > Hi Lars
> >
> > sorry for not writing this to the mailing-list. i'm getting desparate 
> > because time is nearly up in school. so i thought i could mail you 
> > directly because i missed the 6 oclock maillist.
>
>
> The mailing list does not run on a fixed schedule, I guess you're just
> getting it as a daily digest rather than as-they-come.  If you're really
> in a hurry, getting mailing list mails as individual mails and then
> asking there is bound to be faster.
>
>
> > I was wondering how i could get the method draw_in_data_port() to draw a 
> > square instead of a triangle. i've succeeded in that but the rotation 
> > doesn't work.
> >
> > i allways thougt that you have to translate o object to 0/0 then rotate 
> > like in rotate_around_origin() and reverse the translation again.
>
>
> If you're only trying to do 90 degrees rotation, you can avoid the
> sin/cos relations entirely and just swap x/y and signs.  But I can't see
> what your angles can be.  I *think* your rotation function is correct.
sounds good but that give me 2 side changes, i need 1.
for examle:
        given: a square abcd (clockwies points of square)
        after rotation: dabc
thas a counter clockwise rotation (point moves one position in square).
> > in the moment the port is only drawn when it's on the right side of the 
> > shape. if i change p[0] and p[1] in draw_in_data_port() i can get i 
> > running on diffrent sides of the shape:
> >         p[0].x = +
> >         p[0].y = +
> >         p[1].x = -
> >         p[1].y = -
> >                 -> shows on left side
> >         p[0].x = +
> >         p[0].y = -
> >         p[1].x = -
> >         p[1].y = +
> >                 -> shows on top side
> >         p[0].x = -
> >         p[0].y = +
> >         p[1].x = +
> >         p[1].y = -
> >                 -> shows on buttom side
>
>
> So... what is your question?

> Oh, a tip:  Long macros are a really bad idea.  Use functions liberally.
it's a give example that contains most of the functionality i need. my 
c-sqills are bad :-( so i'll not try and make a new lib.
> -Lars
thanks andi