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// * This file is part of the COLOBOT source code
// * Copyright (C) 2012, Polish Portal of Colobot (PPC)
// *
// * This program 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.
// *
// * This program 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 this program. If not, see http://www.gnu.org/licenses/.
/**
* \file math/point.h
* \brief Point struct and related functions
*/
#pragma once
#include "math/const.h"
#include "math/func.h"
#include <cmath>
#include <sstream>
// Math module namespace
namespace Math {
/**
* \struct Point
* \brief 2D point
*
* Represents a 2D point (x, y).
* Contains the required methods for operating on points.
*
* All methods are made inline to maximize optimization.
*/
struct Point
{
//! X coord
float x;
//! Y coord
float y;
//! Constructs a zero point: (0,0)
inline Point()
: x(0.0f)
, y(0.0f)
{}
//! Constructs a point from given coords: (x,y)
inline explicit Point(float _x, float _y)
: x(_x)
, y(_y)
{}
//! Sets the zero point: (0,0)
inline void LoadZero()
{
x = y = 0.0f;
}
//! Returns the struct cast to \c float* array; use with care!
inline float* Array()
{
return reinterpret_cast<float*>(this);
}
//! Returns the struct cast to <tt>const float*</tt> array; use with care!
inline const float* Array() const
{
return reinterpret_cast<const float*>(this);
}
//! Returns the distance from (0,0) to the point (x,y)
inline float Length()
{
return sqrtf(x*x + y*y);
}
//! Returns the inverted point
inline Point operator-() const
{
return Point(-x, -y);
}
//! Adds the given point
inline const Point& operator+=(const Point &right)
{
x += right.x;
y += right.y;
return *this;
}
//! Adds two points
inline friend const Point operator+(const Point &left, const Point &right)
{
return Point(left.x + right.x, left.y + right.y);
}
//! Subtracts the given vector
inline const Point& operator-=(const Point &right)
{
x -= right.x;
y -= right.y;
return *this;
}
//! Subtracts two points
inline friend const Point operator-(const Point &left, const Point &right)
{
return Point(left.x - right.x, left.y - right.y);
}
//! Multiplies by given scalar
inline const Point& operator*=(const float &right)
{
x *= right;
y *= right;
return *this;
}
//! Multiplies point by scalar
inline friend const Point operator*(const float &left, const Point &right)
{
return Point(left * right.x, left * right.y);
}
//! Multiplies point by scalar
inline friend const Point operator*(const Point &left, const float &right)
{
return Point(left.x * right, left.y * right);
}
//! Divides by given scalar
inline const Point& operator/=(const float &right)
{
x /= right;
y /= right;
return *this;
}
//! Divides point by scalar
inline friend const Point operator/(const Point &left, const float &right)
{
return Point(left.x / right, left.y / right);
}
//! Returns a string "[x, y]"
inline std::string ToString() const
{
std::stringstream s;
s.precision(3);
s << "[" << x << ", " << y << "]";
return s.str();
}
}; // struct Point
//! Checks if two vectors are equal within given \a tolerance
inline bool PointsEqual(const Point &a, const Point &b, float tolerance = TOLERANCE)
{
return IsEqual(a.x, b.x, tolerance) && IsEqual(a.y, b.y, tolerance);
}
//! Permutes two points
inline void Swap(Point &a, Point &b)
{
Point c;
c = a;
a = b;
b = c;
}
//! Returns the distance between two points
inline float Distance(const Point &a, const Point &b)
{
return sqrtf((a.x-b.x)*(a.x-b.x) + (a.y-b.y)*(a.y-b.y));
}
} // namespace Math
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