52 lines
1.5 KiB
C
52 lines
1.5 KiB
C
#pragma once
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#include <math.h>
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#define VX(v) ((v).x)
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#define VY(v) ((v).y)
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#define VMOD(v) ((v).mod)
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#define VANGLE(v) ((v).angle)
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#define MOD(x,y) (sqrt((x)*(x) + (y)*(y)))
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#define ANGLE(x,y)(((x)==0.) ? 0. : atan2(y,x))
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#define vect_dist(v,u) MOD((v)->x-(u)->x, (v)->y-(u)->y)
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#define vect_odist(v) MOD((v)->x, (v)->y)
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// Base of 2D vectors.
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typedef struct Vec2_ {
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double x, y; // Cartesian values.
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double mod, angle; // Polar values.
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} Vec2;
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// Misc
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double angle_diff(const double ref, double a);
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void limit_speed(Vec2* vel, const double speed);
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void limit_speeddt(Vec2* vel, const double speed, const double dt);
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// Vector manupulation.
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void vect_cset(Vec2* v, const double x, const double y);
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// Doesn't set mod nor angle.
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void vect_csetmin(Vec2* v, const double x, const double y);
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void vect_pset(Vec2* v, const double mod, const double angle);
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void vectcpy(Vec2* dest, const Vec2* src);
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void vectnull(Vec2* v);
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double vect_angle(const Vec2* ref, const Vec2* v);
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void vect_cadd(Vec2* v, const double x, const double y);
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// Describe any solid in 2D space.
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typedef struct Solid_ {
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double mass, dir, dir_vel; // Properties.
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Vec2 vel, pos, force; // Position/velocity vectors.
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void(*update)(struct Solid_*, const double); // Update method.
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} Solid;
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// Solid manipulation.
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void solid_init(Solid* dest, const double mass, const double dir,
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const Vec2* pos, const Vec2* vel);
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Solid* solid_create(const double mass, const double dir,
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const Vec2* pos, const Vec2* vel);
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void solid_free(Solid* src);
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