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| From | Ben Bacarisse <ben.usenet@bsb.me.uk> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: routine for angles needed |
| Date | 2015-08-02 22:25 +0100 |
| Organization | A noiseless patient Spider |
| Message-ID | <87fv418jt0.fsf@bsb.me.uk> (permalink) |
| References | (4 earlier) <df521e75-bc0d-4b6a-bdc8-30f31b6e1f8e@googlegroups.com> <e0442a46-b01f-45dc-905b-ebecc243dcd8@googlegroups.com> <c559dab6-c3d5-45ff-a44c-1200a3ccf023@googlegroups.com> <3840e0cd-5109-4e45-954b-87f36583efa6@googlegroups.com> <e3b91cd5-165f-456a-a830-0c6e2b6d6a0e@googlegroups.com> |
fir <profesor.fir@gmail.com> writes:
<snip>
> float NormAngle(float alfa)
> {
> while( alfa < -180. ) alfa += 360.;
> while( alfa >= 180. ) alfa -= 360.;
>
> return alfa;
> }
Consider fmod.
> float DXDYToAngle(float dx, float dy)
> {
> if(dx==0 && dy ==0) return 0; //ERROR_("XY2Alfa alfa undefined");
>
> if(dx==0 && dy>0) return 90.0;
> if(dx==0 && dy<0) return -90.0;
>
> if(dy==0 && dx>0) return 0.0;
> if(dy==0 && dx<0) return 180.0;
>
>
> float angle = (180.0/M_PI)*atan(dy/dx);
>
> if(dy<0 && dx<0) angle +=180.0-360.0;
> if(dy>0 && dx<0) angle +=180.0;
>
> return angle;
Consider atan2.
<snip>
--
Ben.
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routine for angles needed fir <profesor.fir@gmail.com> - 2015-08-02 10:17 -0700
Re: routine for angles needed Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-08-02 10:38 -0700
Re: routine for angles needed fir <profesor.fir@gmail.com> - 2015-08-02 11:10 -0700
Re: routine for angles needed Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-08-02 11:26 -0700
Re: routine for angles needed fir <profesor.fir@gmail.com> - 2015-08-02 11:41 -0700
Re: routine for angles needed fir <profesor.fir@gmail.com> - 2015-08-02 12:02 -0700
Re: routine for angles needed Bartc <bc@freeuk.com> - 2015-08-02 18:41 +0100
Re: routine for angles needed fir <profesor.fir@gmail.com> - 2015-08-02 11:43 -0700
Re: routine for angles needed Bartc <bc@freeuk.com> - 2015-08-02 20:00 +0100
Re: routine for angles needed fir <profesor.fir@gmail.com> - 2015-08-02 12:04 -0700
Re: routine for angles needed fir <profesor.fir@gmail.com> - 2015-08-02 12:10 -0700
Re: routine for angles needed fir <profesor.fir@gmail.com> - 2015-08-02 12:24 -0700
Re: routine for angles needed Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-08-02 12:32 -0700
Re: routine for angles needed Bartc <bc@freeuk.com> - 2015-08-02 20:40 +0100
Re: routine for angles needed fir <profesor.fir@gmail.com> - 2015-08-02 12:59 -0700
Re: routine for angles needed Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-08-02 13:14 -0700
Re: routine for angles needed fir <profesor.fir@gmail.com> - 2015-08-02 13:39 -0700
Re: routine for angles needed fir <profesor.fir@gmail.com> - 2015-08-02 13:45 -0700
Re: routine for angles needed fir <profesor.fir@gmail.com> - 2015-08-03 07:48 -0700
Re: routine for angles needed Bartc <bc@freeuk.com> - 2015-08-03 17:06 +0100
Re: routine for angles needed fir <profesor.fir@gmail.com> - 2015-08-03 09:09 -0700
Re: routine for angles needed fir <profesor.fir@gmail.com> - 2015-08-03 09:17 -0700
Re: routine for angles needed Bartc <bc@freeuk.com> - 2015-08-03 17:48 +0100
Re: routine for angles needed Keith Thompson <kst-u@mib.org> - 2015-08-03 13:44 -0700
Re: routine for angles needed Bartc <bc@freeuk.com> - 2015-08-03 23:51 +0100
Re: routine for angles needed Keith Thompson <kst-u@mib.org> - 2015-08-03 18:30 -0700
Re: routine for angles needed glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-08-03 23:11 +0000
Re: routine for angles needed Bartc <bc@freeuk.com> - 2015-08-04 01:32 +0100
Re: routine for angles needed glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-08-04 01:14 +0000
Re: routine for angles needed Robert Wessel <robertwessel2@yahoo.com> - 2015-08-03 20:26 -0500
Re: routine for angles needed glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-08-04 18:24 +0000
Re: routine for angles needed Robert Wessel <robertwessel2@yahoo.com> - 2015-08-05 01:46 -0500
Re: routine for angles needed glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-08-05 18:06 +0000
Re: routine for angles needed Tim Rentsch <txr@alumni.caltech.edu> - 2015-09-05 11:37 -0700
Re: routine for angles needed Keith Thompson <kst-u@mib.org> - 2015-09-05 16:24 -0700
Re: routine for angles needed Richard Damon <Richard@Damon-Family.org> - 2015-09-05 21:01 -0400
Re: routine for angles needed Robert Wessel <robertwessel2@yahoo.com> - 2015-09-05 23:30 -0500
Re: routine for angles needed glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-09-06 05:37 +0000
Re: routine for angles needed Robert Wessel <robertwessel2@yahoo.com> - 2015-09-07 00:27 -0500
Re: routine for angles needed glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-09-06 05:31 +0000
Re: routine for angles needed James Kuyper <jameskuyper@verizon.net> - 2015-09-06 11:57 -0400
Re: routine for angles needed Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-09-06 17:44 +0100
Re: routine for angles needed James Kuyper <jameskuyper@verizon.net> - 2015-09-06 14:02 -0400
Re: routine for angles needed Robert Wessel <robertwessel2@yahoo.com> - 2015-09-07 00:31 -0500
Re: routine for angles needed Keith Thompson <kst-u@mib.org> - 2015-09-06 11:59 -0700
Re: routine for angles needed Tim Rentsch <txr@alumni.caltech.edu> - 2015-09-06 18:04 -0700
Re: routine for angles needed Keith Thompson <kst-u@mib.org> - 2015-09-06 18:30 -0700
Re: routine for angles needed Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-09-06 18:48 -0700
Re: routine for angles needed Robert Wessel <robertwessel2@yahoo.com> - 2015-09-07 00:44 -0500
Re: routine for angles needed Tim Rentsch <txr@alumni.caltech.edu> - 2015-09-10 05:44 -0700
Re: routine for angles needed Robert Wessel <robertwessel2@yahoo.com> - 2015-08-03 20:16 -0500
Re: routine for angles needed glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-08-04 01:26 +0000
Re: routine for angles needed Robert Wessel <robertwessel2@yahoo.com> - 2015-08-05 02:05 -0500
Re: routine for angles needed Keith Thompson <kst-u@mib.org> - 2015-08-03 18:33 -0700
Re: routine for angles needed glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-08-04 21:24 +0000
Re: routine for angles needed Robert Wessel <robertwessel2@yahoo.com> - 2015-08-03 19:41 -0500
Re: routine for angles needed fir <profesor.fir@gmail.com> - 2015-08-02 12:51 -0700
Re: routine for angles needed fir <profesor.fir@gmail.com> - 2015-08-02 12:56 -0700
Re: routine for angles needed Bartc <bc@freeuk.com> - 2015-08-02 20:57 +0100
Re: routine for angles needed fir <profesor.fir@gmail.com> - 2015-08-02 13:06 -0700
Re: routine for angles needed Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-08-02 22:25 +0100
Re: routine for angles needed Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-08-02 22:27 +0100
Re: routine for angles needed fir <profesor.fir@gmail.com> - 2015-08-02 14:40 -0700
Re: routine for angles needed "Chris M. Thomasson" <nospam@nospam.nospam> - 2015-08-02 19:08 -0700
Re: routine for angles needed fir <profesor.fir@gmail.com> - 2015-08-03 02:18 -0700
Re: routine for angles needed danncorbit@gmail.com - 2015-08-12 02:18 -0700
Re: routine for angles needed bartekltg <bartekltg@gmail.com> - 2015-09-07 05:02 +0200
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