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
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