Point2D.cpp

Go to the documentation of this file.

//
// Point2D.cpp
// A point in the 2-D plane.
//

#include <cmath>
#include "Point2D.hpp"
#include "../BasicDatatypes.hpp"

namespace datatypes
{
        
Point2D::value_type Point2D::dist( const Point2D & point ) const
{
        return hypot(m_x - point.m_x, m_y - point.m_y);
}

Point2D::value_type Point2D::distSquare( const Point2D & point ) const
{
        const value_type x = getX() - point.getX();
        const value_type y = getY() - point.getY();
        return x * x + y * y;
}

Point2D Point2D::fromPolar(value_type r, value_type angle)
{
        Point2D p;
        p.setPolar(r, angle);
        return p;
}


void Point2D::rotate(value_type angle)
{
        *this = rotated(angle);
}

Point2D Point2D::rotated(value_type angle_rad) const
{
        value_type dCos = cos(angle_rad);
        value_type dSin = sin(angle_rad);
        return Point2D(m_x * dCos - m_y * dSin,
                                   m_x * dSin + m_y * dCos);
}

Point2D Point2D::normalized() const
{
        Point2D result(*this);
        result.normalize();
        return result;
}

void Point2D::normalize()
{
        if (isZero())
                // Vector has zero length. Such a vector will be left unchanged.
                return;

        // The division below will be done in float, not in double! Hence,
        // we must retrieve the length in float already as well.
        value_type len = dist();

        // If isZero() was false above, the distance cannot be zero
        // anyway, so checking for this would only result in unreachable
        // code.
        assert (!fuzzyCompare(len, value_type(0.0)));

        *this /= len;
}

std::string Point2D::toString(UINT16 digits) const
{
        std::string text = "(" + ::toString(getX(), (int)digits) + ", " + ::toString(getY(), (int)digits) + ")";
        return text;
}


}       // namespace datatypes