PhysicsTools::Spline::Segment Struct Reference

internal class describing a "segment" (between two x points) More...

Public Member Functions
float	deriv (float x) const
float	eval (float x) const
float	integral (float x) const

Public Attributes
float	area
float	coeffs [4]

Detailed Description

internal class describing a "segment" (between two x points)

Definition at line 56 of file Spline.h.

Member Function Documentation

float PhysicsTools::Spline::Segment::deriv

(

float

x

)

const

Definition at line 32 of file Spline.cc.

References ztail::d, and tmp.

Referenced by PhysicsTools::Spline::deriv().

{
    float tmp;
    float d = 0.0;
    d += coeffs[1];         tmp = x;
    d += coeffs[2] * tmp * 2.0; tmp *= x;
    d += coeffs[3] * tmp * 3.0;
    return d;
}

float PhysicsTools::Spline::Segment::eval

(

float

x

)

const

Definition at line 21 of file Spline.cc.

References coeffs, and tmp.

Referenced by PhysicsTools::Spline::eval().

{
    float tmp;
    float y = 0.0;
    y += coeffs[0];     tmp = x;
    y += coeffs[1] * tmp;   tmp *= x;
    y += coeffs[2] * tmp;   tmp *= x;
    y += coeffs[3] * tmp;
    return y;
}

float PhysicsTools::Spline::Segment::integral

(

float

x

)

const

Definition at line 42 of file Spline.cc.

References PhysicsTools::Spline::area, and tmp.

Referenced by PhysicsTools::Spline::set().

{
    float tmp = x;
    float area = this->area;
    area += coeffs[0] * tmp;           tmp *= x;
    area += coeffs[1] * tmp * (1.0 / 2.0); tmp *= x;
    area += coeffs[2] * tmp * (1.0 / 3.0); tmp *= x;
    area += coeffs[3] * tmp * (1.0 / 4.0);
    return area;
}

Member Data Documentation

float PhysicsTools::Spline::Segment::area

Definition at line 58 of file Spline.h.

Referenced by PhysicsTools::Spline::set().

float PhysicsTools::Spline::Segment::coeffs[4]

Definition at line 57 of file Spline.h.

Referenced by eval(), and PhysicsTools::Spline::set().