joshua
/
beats-sim
Archived
Simulation of the Gravity Beats app
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 // // Math.h // GravityBeats // // Created by Joshua Moerman on 1/12/13. // Copyright (c) 2013 Vadovas. All rights reserved. // #ifndef GravityBeats_Math_h #define GravityBeats_Math_h #include namespace math { struct Vec2 { float x, y; Vec2& operator *= (float rh){ x *= rh; y *= rh; return *this; } Vec2& operator+= (Vec2 const & rh){ x += rh.x; y += rh.y; return *this; } float sqr_length() const { return x*x + y*y; } float length() const { return std::sqrt(sqr_length()); } Vec2& normalize(){ const float l = length(); if(l == 0.0f) { return *this; } x /= l; y /= l; return *this; } }; inline Vec2 operator*(float lh, Vec2 rh){ rh *= lh; return rh; } inline Vec2 operator+(Vec2 lh, Vec2 const & rh){ return lh += rh; } inline Vec2 operator-(Vec2 lh, Vec2 const & rh){ return lh += -1.0*rh; } inline float dot(Vec2 const & lh, Vec2 const & rh){ return lh.x*rh.x + lh.y*rh.y; } inline Vec2 rotate_ccw(Vec2 v){ std::swap(v.x, v.y); v.x *= -1.0; return v; } inline Vec2 normalize(Vec2 v){ return v.normalize(); } inline float distance_point_point(Vec2 p1, Vec2 p2){ return (p2 - p1).length(); } // p point, [v,w] line segment inline float distance_point_line(Vec2 p, Vec2 v, Vec2 w){ // http://stackoverflow.com/questions/849211/shortest-distance-between-a-point-and-a-line-segment const float l2 = (v-w).sqr_length(); if (l2 == 0.0) return distance_point_point(p, v); const float t = dot(p - v, w - v) / l2; if (t < 0.0) return distance_point_point(p, v); else if (t > 1.0) return distance_point_point(p, w); auto projection = v + t * (w - v); return distance_point_point(p, projection); } template constexpr T clamp(T input, T min, T max){ return input > max ? max : input < min ? min : input; } } #endif