grbl-LPC-CoreXY/geometry.c

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