39 lines
1.0 KiB
C
39 lines
1.0 KiB
C
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/*
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geometry.h - a place for geometry helpers
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Part of Grbl
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Copyright (c) 2009 Simen Svale Skogsrud
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Grbl is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Grbl is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Grbl. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <math.h>
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// Find the angle from the positive y axis to the given point with respect to origo.
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double theta(double x, double y)
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{
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double theta = atan(x/fabs(y));
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if (y>0) {
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return(theta);
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} else {
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if (theta>0)
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{
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return(theta-M_PI);
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} else {
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return(-M_PI-theta);
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}
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}
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}
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