mirror of https://github.com/ArduPilot/ardupilot
97 lines
3.0 KiB
C
97 lines
3.0 KiB
C
// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: t -*-
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#ifndef AP_MATH_H
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#define AP_MATH_H
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// Assorted useful math operations for ArduPilot(Mega)
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#include <AP_Common.h>
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#include <AP_Param.h>
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#include <math.h>
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#include <stdint.h>
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#include "rotations.h"
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#include "vector2.h"
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#include "vector3.h"
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#include "matrix3.h"
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#include "quaternion.h"
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#include "polygon.h"
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#ifndef PI
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#define PI 3.141592653589793
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#endif
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#define DEG_TO_RAD 0.017453292519943295769236907684886
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#define RAD_TO_DEG 57.295779513082320876798154814105
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// acceleration due to gravity in m/s/s
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#define GRAVITY_MSS 9.80665
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// define AP_Param types AP_Vector3f and Ap_Matrix3f
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AP_PARAMDEFV(Matrix3f, Matrix3f, AP_PARAM_MATRIX3F);
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AP_PARAMDEFV(Vector3f, Vector3f, AP_PARAM_VECTOR3F);
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// a varient of asin() that always gives a valid answer.
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float safe_asin(float v);
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// a varient of sqrt() that always gives a valid answer.
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float safe_sqrt(float v);
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// find a rotation that is the combination of two other
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// rotations. This is used to allow us to add an overall board
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// rotation to an existing rotation of a sensor such as the compass
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enum Rotation rotation_combination(enum Rotation r1, enum Rotation r2, bool *found = NULL);
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// return distance in meters between two locations
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float get_distance(const struct Location *loc1, const struct Location *loc2);
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// return distance in centimeters between two locations
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int32_t get_distance_cm(const struct Location *loc1, const struct Location *loc2);
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// return bearing in centi-degrees between two locations
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int32_t get_bearing_cd(const struct Location *loc1, const struct Location *loc2);
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// see if location is past a line perpendicular to
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// the line between point1 and point2. If point1 is
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// our previous waypoint and point2 is our target waypoint
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// then this function returns true if we have flown past
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// the target waypoint
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bool location_passed_point(struct Location & location,
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struct Location & point1,
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struct Location & point2);
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// extrapolate latitude/longitude given bearing and distance
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void location_update(struct Location *loc, float bearing, float distance);
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// extrapolate latitude/longitude given distances north and east
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void location_offset(struct Location *loc, float ofs_north, float ofs_east);
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// constrain a value
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float constrain(float amt, float low, float high);
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int16_t constrain_int16(int16_t amt, int16_t low, int16_t high);
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int32_t constrain_int32(int32_t amt, int32_t low, int32_t high);
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// degrees -> radians
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float radians(float deg);
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// radians -> degrees
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float degrees(float rad);
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// square
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float sq(float v);
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// sqrt of sum of squares
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float pythagorous2(float a, float b);
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float pythagorous3(float a, float b, float c);
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#ifdef radians
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#error "Build is including Arduino base headers"
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#endif
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/* The following three functions used to be arduino core macros */
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#define max(a,b) ((a)>(b)?(a):(b))
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#define min(a,b) ((a)<(b)?(a):(b))
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#endif // AP_MATH_H
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