G4VViewer::G4Spline Class Reference

#include <G4VViewer.hh>

Public Member Functions
	G4Spline ()
	~G4Spline ()
void	AddSplinePoint (const G4Vector3D &v)
G4Vector3D	GetInterpolatedSplinePoint (float t)
int	GetNumPoints ()
G4Vector3D	GetPoint (int)
G4Vector3D	CatmullRom_Eq (float t, const G4Vector3D &p1, const G4Vector3D &p2, const G4Vector3D &p3, const G4Vector3D &p4)

Detailed Description

Definition at line 176 of file G4VViewer.hh.

Constructor & Destructor Documentation

G4VViewer::G4Spline::G4Spline

(

)

Definition at line 393 of file G4VViewer.cc.

: vp(), delta_t(0)
{
}

G4VViewer::G4Spline::~G4Spline

(

)

Definition at line 399 of file G4VViewer.cc.

{}

Member Function Documentation

void G4VViewer::G4Spline::AddSplinePoint

(

const G4Vector3D &

v

)

Definition at line 416 of file G4VViewer.cc.

{
    vp.push_back(v);
    delta_t = (float)1 / (float)vp.size();
}

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G4Vector3D G4VViewer::G4Spline::CatmullRom_Eq	(	float	t,
		const G4Vector3D &	p1,
		const G4Vector3D &	p2,
		const G4Vector3D &	p3,
		const G4Vector3D &	p4
	)

Definition at line 403 of file G4VViewer.cc.

{
    float t2 = t * t;
    float t3 = t2 * t;
    
    float b1 = .5 * (  -t3 + 2*t2 - t);
    float b2 = .5 * ( 3*t3 - 5*t2 + 2);
    float b3 = .5 * (-3*t3 + 4*t2 + t);
    float b4 = .5 * (   t3 -   t2    );
    
    return (p1*b1 + p2*b2 + p3*b3 + p4*b4);
}

G4Vector3D G4VViewer::G4Spline::GetInterpolatedSplinePoint

(

float

t

)

Definition at line 433 of file G4VViewer.cc.

{
    // Find out in which interval we are on the spline
    int p = (int)(t / delta_t);
    // Compute local control point indices
#define BOUNDS(pp) { if (pp < 0) pp = 0; else if (pp >= (int)vp.size()-1) pp = vp.size() - 1; }
    int p0 = p - 1;     BOUNDS(p0);
    int p1 = p;         BOUNDS(p1);
    int p2 = p + 1;     BOUNDS(p2);
    int p3 = p + 2;     BOUNDS(p3);
    // Relative (local) time
    float lt = (t - delta_t*(float)p) / delta_t;
    // Interpolate
    return CatmullRom_Eq(lt, vp[p0], vp[p1], vp[p2], vp[p3]);
}

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int G4VViewer::G4Spline::GetNumPoints

(

)

Definition at line 428 of file G4VViewer.cc.

{
    return vp.size();
}

G4Vector3D G4VViewer::G4Spline::GetPoint

(

int

a

)

Definition at line 423 of file G4VViewer.cc.

{
    return vp[a];
}

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The documentation for this class was generated from the following files:

• geant4.10.03.p01/source/visualization/management/include/G4VViewer.hh
• geant4.10.03.p01/source/visualization/management/src/G4VViewer.cc