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## igeo
Class ITensionLine

    java.lang.Object
      igeo.IObject
          igeo.ICurve
              igeo.ITensionLine

All Implemented Interfaces:
  ICurveI, ICurveOp, IDynamics, IParameter, ISubobject, ITensionI, ITransformable

    public class ITensionLine

extends ICurve
implements ITensionI, IDynamics

Class of IDynamicObject to simulate tension force between two particles.

Version:
  0.7.0.0;
Author:
  Satoru Sugihara

Field Summary
`java.util.ArrayList<IObject>` | `targets` target objects to be updated by dynamic object
`ITension` | `tensionDynamics`

Fields inherited from class igeo.ICurve
`curve`

Fields inherited from class igeo.IObject
`attribute, dynamics, graphics, parameter, server`

Fields inherited from interface igeo.ITensionI
`defaultTension`

Constructor Summary
`ITensionLine(IParticleI p1, IParticleI p2)`
`ITensionLine(IParticleI p1, IParticleI p2, double tension)`
`ITensionLine(IVecI p1, IVecI p2)`
`ITensionLine(IVecI p1, IVecI p2, double tension)`

Method Summary
`boolean` | `constant()` if constantTension is true, amount of force is always constant and it's equals to tension.
`ITensionLine` | `constant(boolean cnst)`
`void` | `initTensionLine(IParticleI p1, IParticleI p2)`
`void` | `initTensionLine(IParticleI p1, IParticleI p2, double tension)`
`void` | `interact(java.util.ArrayList<IDynamics> dynamics)` behavior definition of interaction with other dynamic objects.
`ITensionLine` | `parent()` for IDynamics
`ITensionLine` | `parent(IObject par)` setting parent object
`IParticleI` | `particle(int i)` alias of pt(int)
`IParticleI` | `particle1()` alias of pt1()
`IParticleI` | `particle2()` alias of pt2()
`IVec` | `pos(int i)` position of particle(i)
`IVec` | `pos1()` position of particle1
`IVec` | `pos2()` position of particle2
`void` | `postinteract(java.util.ArrayList<IDynamics> dynamics)` executed after interact(ArrayList).
`void` | `postupdate()` executed after update().
`void` | `preinteract(java.util.ArrayList<IDynamics> dynamics)` executed before interact(ArrayList).
`void` | `preupdate()` executed before update().
`IParticleI` | `pt(int i)` getting end point.
`IParticleI` | `pt1()` getting end point1.
`IParticleI` | `pt2()` getting end point2.
`ITensionLine` | `removeTarget(int i)` remove target object.
`ITensionLine` | `removeTarget(IObject obj)` remove target object.
`IObject` | `target(int i)` get target object.
`ITensionLine` | `target(IObject targetObj)` add terget object to be updated by this dynamic object.
`int` | `targetNum()` get total target number.
`java.util.ArrayList<IObject>` | `targets()` get all target objects.
`double` | `tension()` tension is a coefficient to convert distance of two points to amount of force.
`ITensionLine` | `tension(double tensionIntensity)`
`void` | `update()` behavior definition of updating dynamics in each time frame
`void` | `updateTarget()` update all terget objects (should be called when the dynamic object is updated).

Methods inherited from class igeo.ICurve
`add, add, add, add, add, add, add, addCP, addCP, addCP, addCP, clr, clr, clr, clr, clr, clr, clr, clr, clr, clr, clr, clr, clr, clr, cp, cp, cp, cp, cp, cp, cpNum, cpNum, cpNum, cps, createGraphic, deg, deg, deg, div, div, dup, end, endCP, ep, ep, epNum, epNum, epNum, flip, get, hide, hsb, hsb, hsb, hsb, initCurve, insertCP, insertCP, isClosed, isClosed, isClosed, isRational, isRational, isRational, isValid, knot, knot, knotNum, knotNum, knotNum, knots, knots, knots, layer, len, len, len, mirror, mirror, mul, mul, mv, mv, mv, name, neg, num, num, num, pt, pt, ref, ref, removeCP, removeCP, removeCP, rev, rot, rot, rot, rot, rot, rot, rot, rot, rot2, rot2, rot2, rot2, rot2, rot2, scale, scale, scale, scale, scale1d, scale1d, scale1d, scale1d, setColor, setColor, setColor, setColor, setColor, setColor, setColor, setColor, setColor, setColor, setColor, setColor, setColor, setColor, setHSBColor, setHSBColor, setHSBColor, setHSBColor, shear, shear, shear, shear, shearXY, shearXY, shearXY, shearXY, shearYZ, shearYZ, shearYZ, shearYZ, shearZX, shearZX, shearZX, shearZX, show, start, startCP, sub, sub, sub, tan, tan, transform, transform, transform, transform, translate, translate, translate, u, u, uend, uend, uend, ustart, ustart, ustart`

Methods inherited from class igeo.IObject
`addDynamics, alpha, alphaInt, attr, attr, blue, blueInt, clearDynamics, clearGraphics, clr, del, deletDynamics, deleteDynamics, deleteDynamics, deleteGraphic, dynamicsNum, getColor, getDynamics, getGraphic, getGraphic, getParameter, graphicsNum, green, greenInt, initGraphic, initObject, isVisible, layer, layer, name, red, redInt, resetGraphic, server, setParameter, syncColor, updateGraphic, visible`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### tensionDynamics

    public ITension tensionDynamics

### targets

    public java.util.ArrayList<IObject> targets

  target objects to be updated by dynamic object

Constructor Detail

### ITensionLine

    public ITensionLine(IParticleI p1,
                        IParticleI p2)

### ITensionLine

    public ITensionLine(IParticleI p1,
                        IParticleI p2,
                        double tension)

### ITensionLine

    public ITensionLine(IVecI p1,
                        IVecI p2)

### ITensionLine

    public ITensionLine(IVecI p1,
                        IVecI p2,
                        double tension)

Method Detail

### initTensionLine

    public void initTensionLine(IParticleI p1,
                                IParticleI p2)

### initTensionLine

    public void initTensionLine(IParticleI p1,
                                IParticleI p2,
                                double tension)

### tension

    public double tension()

  Description copied from interface: `ITensionI`
  tension is a coefficient to convert distance of two points to amount of force.

  Specified by:
    `tension` in interface `ITensionI`

### tension

    public ITensionLine tension(double tensionIntensity)

  Specified by:
    `tension` in interface `ITensionI`

### constant

    public boolean constant()

  Description copied from interface: `ITensionI`
  if constantTension is true, amount of force is always constant and it's equals to tension. Only direction of force changes. But if the distance is zero, force is also zero.

  Specified by:
    `constant` in interface `ITensionI`

### constant

    public ITensionLine constant(boolean cnst)

  Specified by:
    `constant` in interface `ITensionI`

### pt

    public IParticleI pt(int i)

  getting end point. i==0 or i==1. if i is other value, returns first point.

  Specified by:
    `pt` in interface `ITensionI`

### particle

    public IParticleI particle(int i)

  alias of pt(int)

  Specified by:
    `particle` in interface `ITensionI`

### pos

    public IVec pos(int i)

  position of particle(i)

  Specified by:
    `pos` in interface `ITensionI`

### pt1

    public IParticleI pt1()

  getting end point1.

  Specified by:
    `pt1` in interface `ITensionI`

### particle1

    public IParticleI particle1()

  alias of pt1()

  Specified by:
    `particle1` in interface `ITensionI`

### pos1

    public IVec pos1()

  position of particle1

  Specified by:
    `pos1` in interface `ITensionI`

### pt2

    public IParticleI pt2()

  getting end point2.

  Specified by:
    `pt2` in interface `ITensionI`

### particle2

    public IParticleI particle2()

  alias of pt2()

  Specified by:
    `particle2` in interface `ITensionI`

### pos2

    public IVec pos2()

  position of particle2

  Specified by:
    `pos2` in interface `ITensionI`

### parent

    public ITensionLine parent()

  for IDynamics

  Specified by:
    `parent` in interface `ISubobject`

### parent

    public ITensionLine parent(IObject par)

  Description copied from interface: `ISubobject`
  setting parent object

  Specified by:
    `parent` in interface `ISubobject`

### target

    public ITensionLine target(IObject targetObj)

  add terget object to be updated by this dynamic object.

  Specified by:
    `target` in interface `IDynamics`

### targetNum

    public int targetNum()

  get total target number.

  Specified by:
    `targetNum` in interface `IDynamics`

### target

    public IObject target(int i)

  get target object.

  Specified by:
    `target` in interface `IDynamics`

### targets

    public java.util.ArrayList<IObject> targets()

  get all target objects.

  Specified by:
    `targets` in interface `IDynamics`

### removeTarget

    public ITensionLine removeTarget(int i)

  remove target object.

  Specified by:
    `removeTarget` in interface `IDynamics`

### removeTarget

    public ITensionLine removeTarget(IObject obj)

  remove target object.

  Specified by:
    `removeTarget` in interface `IDynamics`

### updateTarget

    public void updateTarget()

  update all terget objects (should be called when the dynamic object is updated).

  Specified by:
    `updateTarget` in interface `IDynamics`

### interact

    public void interact(java.util.ArrayList<IDynamics> dynamics)

  behavior definition of interaction with other dynamic objects. The server puts all dynamic objects including itself.

  Specified by:
    `interact` in interface `IDynamics`

### update

    public void update()

  behavior definition of updating dynamics in each time frame

  Specified by:
    `update` in interface `IDynamics`

### preinteract

    public void preinteract(java.util.ArrayList<IDynamics> dynamics)

  Description copied from interface: `IDynamics`
  executed before interact(ArrayList). behavior can be changed by IConfig.enablePreinteract and IConfig.loopPreinteract.

  Specified by:
    `preinteract` in interface `IDynamics`

### postinteract

    public void postinteract(java.util.ArrayList<IDynamics> dynamics)

  Description copied from interface: `IDynamics`
  executed after interact(ArrayList). behavior can be changed by IConfig.enablePostinteract and IConfig.loopPostinteract.

  Specified by:
    `postinteract` in interface `IDynamics`

### preupdate

    public void preupdate()

  Description copied from interface: `IDynamics`
  executed before update(). behavior can be changed by IConfig.enablePreupdate and IConfig.loopPreupdate.

  Specified by:
    `preupdate` in interface `IDynamics`

### postupdate

    public void postupdate()

  Description copied from interface: `IDynamics`
  executed after update(). behavior can be changed by IConfig.enablePostupdate and IConfig.loopPostupdate.

  Specified by:
    `postupdate` in interface `IDynamics`

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