167 lines
4 KiB
C++
167 lines
4 KiB
C++
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#pragma once
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#include <cmath>
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#include "base.h"
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namespace msdfgen {
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/**
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* A 2-dimensional euclidean floating-point vector.
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* @author Viktor Chlumsky
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*/
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struct Vector2 {
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double x, y;
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inline Vector2(double val = 0) : x(val), y(val) { }
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inline Vector2(double x, double y) : x(x), y(y) { }
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/// Sets the vector to zero.
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inline void reset() {
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x = 0, y = 0;
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}
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/// Sets individual elements of the vector.
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inline void set(double x, double y) {
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this->x = x, this->y = y;
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}
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/// Returns the vector's squared length.
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inline double squaredLength() const {
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return x*x+y*y;
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}
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/// Returns the vector's length.
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inline double length() const {
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return sqrt(x*x+y*y);
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}
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/// Returns the normalized vector - one that has the same direction but unit length.
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inline Vector2 normalize(bool allowZero = false) const {
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if (double len = length())
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return Vector2(x/len, y/len);
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return Vector2(0, !allowZero);
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}
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/// Returns a vector with the same length that is orthogonal to this one.
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inline Vector2 getOrthogonal(bool polarity = true) const {
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return polarity ? Vector2(-y, x) : Vector2(y, -x);
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}
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/// Returns a vector with unit length that is orthogonal to this one.
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inline Vector2 getOrthonormal(bool polarity = true, bool allowZero = false) const {
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if (double len = length())
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return polarity ? Vector2(-y/len, x/len) : Vector2(y/len, -x/len);
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return polarity ? Vector2(0, !allowZero) : Vector2(0, -!allowZero);
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}
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#ifdef MSDFGEN_USE_CPP11
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inline explicit operator bool() const {
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return x || y;
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}
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#else
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inline operator const void *() const {
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return x || y ? this : NULL;
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}
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#endif
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inline Vector2 &operator+=(const Vector2 other) {
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x += other.x, y += other.y;
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return *this;
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}
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inline Vector2 &operator-=(const Vector2 other) {
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x -= other.x, y -= other.y;
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return *this;
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}
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inline Vector2 &operator*=(const Vector2 other) {
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x *= other.x, y *= other.y;
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return *this;
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}
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inline Vector2 &operator/=(const Vector2 other) {
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x /= other.x, y /= other.y;
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return *this;
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}
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inline Vector2 &operator*=(double value) {
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x *= value, y *= value;
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return *this;
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}
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inline Vector2 &operator/=(double value) {
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x /= value, y /= value;
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return *this;
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}
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};
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/// A vector may also represent a point, which shall be differentiated semantically using the alias Point2.
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typedef Vector2 Point2;
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/// Dot product of two vectors.
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inline double dotProduct(const Vector2 a, const Vector2 b) {
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return a.x*b.x+a.y*b.y;
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}
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/// A special version of the cross product for 2D vectors (returns scalar value).
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inline double crossProduct(const Vector2 a, const Vector2 b) {
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return a.x*b.y-a.y*b.x;
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}
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inline bool operator==(const Vector2 a, const Vector2 b) {
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return a.x == b.x && a.y == b.y;
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}
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inline bool operator!=(const Vector2 a, const Vector2 b) {
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return a.x != b.x || a.y != b.y;
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}
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inline Vector2 operator+(const Vector2 v) {
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return v;
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}
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inline Vector2 operator-(const Vector2 v) {
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return Vector2(-v.x, -v.y);
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}
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inline bool operator!(const Vector2 v) {
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return !v.x && !v.y;
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}
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inline Vector2 operator+(const Vector2 a, const Vector2 b) {
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return Vector2(a.x+b.x, a.y+b.y);
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}
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inline Vector2 operator-(const Vector2 a, const Vector2 b) {
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return Vector2(a.x-b.x, a.y-b.y);
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}
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inline Vector2 operator*(const Vector2 a, const Vector2 b) {
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return Vector2(a.x*b.x, a.y*b.y);
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}
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inline Vector2 operator/(const Vector2 a, const Vector2 b) {
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return Vector2(a.x/b.x, a.y/b.y);
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}
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inline Vector2 operator*(double a, const Vector2 b) {
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return Vector2(a*b.x, a*b.y);
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}
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inline Vector2 operator/(double a, const Vector2 b) {
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return Vector2(a/b.x, a/b.y);
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}
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inline Vector2 operator*(const Vector2 a, double b) {
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return Vector2(a.x*b, a.y*b);
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}
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inline Vector2 operator/(const Vector2 a, double b) {
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return Vector2(a.x/b, a.y/b);
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}
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}
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