hep.graphics.j3d
Class Helix

java.lang.Object
  javax.media.j3d.SceneGraphObject
      javax.media.j3d.Node
          javax.media.j3d.Leaf
              javax.media.j3d.Shape3D
                  hep.graphics.j3d.Helix

public class Helix

extends javax.media.j3d.Shape3D

Helix segment in solenoidal magnetic field along z-axis. Parameters are defined in "vertex representation".

Version:

3.0.0

Author:

J.Hrivnac

Source Code:

Helix.java

Field Summary

Fields inherited from class javax.media.j3d.Shape3D

ALLOW_APPEARANCE_OVERRIDE_READ, ALLOW_APPEARANCE_OVERRIDE_WRITE, ALLOW_APPEARANCE_READ, ALLOW_APPEARANCE_WRITE, ALLOW_COLLISION_BOUNDS_READ, ALLOW_COLLISION_BOUNDS_WRITE, ALLOW_GEOMETRY_READ, ALLOW_GEOMETRY_WRITE

Fields inherited from class javax.media.j3d.Node

ALLOW_AUTO_COMPUTE_BOUNDS_READ, ALLOW_AUTO_COMPUTE_BOUNDS_WRITE, ALLOW_BOUNDS_READ, ALLOW_BOUNDS_WRITE, ALLOW_COLLIDABLE_READ, ALLOW_COLLIDABLE_WRITE, ALLOW_LOCAL_TO_VWORLD_READ, ALLOW_PICKABLE_READ, ALLOW_PICKABLE_WRITE, ENABLE_COLLISION_REPORTING, ENABLE_PICK_REPORTING

Constructor Summary

Helix(int charge, double eta, double phi, double pt, double v_phi, double v_rho, double v_z, double mField, int granularity, javax.media.j3d.Appearance appearance)
Create helix.

Method Summary

static void	cutAt(double length, double radius) Set maximal end point of the helix.
javax.vecmath.Vector3d	end() End point of the helix.

Methods inherited from class javax.media.j3d.Shape3D

addGeometry, cloneNode, duplicateNode, getAllGeometries, getAppearance, getAppearanceOverrideEnable, getBounds, getCollisionBounds, getGeometry, getGeometry, indexOfGeometry, insertGeometry, intersect, intersect, intersect, numGeometries, removeAllGeometries, removeGeometry, removeGeometry, setAppearance, setAppearanceOverrideEnable, setCollisionBounds, setGeometry, setGeometry

Methods inherited from class javax.media.j3d.Node

cloneTree, cloneTree, cloneTree, cloneTree, cloneTree, cloneTree, getBoundsAutoCompute, getCollidable, getLocalToVworld, getLocalToVworld, getParent, getPickable, setBounds, setBoundsAutoCompute, setCollidable, setPickable

Methods inherited from class javax.media.j3d.SceneGraphObject

clearCapability, clearCapabilityIsFrequent, duplicateSceneGraphObject, getCapability, getCapabilityIsFrequent, getUserData, isCompiled, isLive, setCapability, setCapabilityIsFrequent, setUserData, updateNodeReferences

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Helix

public Helix(int charge,
             double eta,
             double phi,
             double pt,
             double v_phi,
             double v_rho,
             double v_z,
             double mField,
             int granularity,
             javax.media.j3d.Appearance appearance)

Create helix.

Parameters:

charge - particles' charge

eta - track' polar angle [deg]

phi - track' azimutal angle [deg]

pt - track' pt [GeV]

v_phi - vertex' polar angle [deg]

v_rho - vertex' radial coordinate

v_z - vertex' z coordinate

mField - magnetic field [T]

granularity - number of segments of curves approximations

appearance - object' Appearance

Preconditions:

charge >= -1 && charge <= 1, phi > 0 && phi < 360, pt > 0, v_phi > 0 && v_phi < 360, mField > 0, granularity > 1

Method Detail

end

public javax.vecmath.Vector3d end()

End point of the helix.

cutAt

public static void cutAt(double length,
                         double radius)

Set maximal end point of the helix. The default is 30,12.