VerletPhysics.VerletLink Class Reference

Verlet breakable link. More...

Inheritance diagram for VerletPhysics.VerletLink:

Public Member Functions
	VerletLink ()
	Create an uninitialized verlet link. More...
	VerletLink (VerletWorld world, VerletPoint a, VerletPoint b)
	Create a simple verlet link. More...
void	Constraint ()
	Apply link constraint on the two verlet points. More...
Public Member Functions inherited from Drawing.SimpleLineSprite
	SimpleLineSprite ()
	Create a grey line sprite. More...

Public Attributes
float	RestingDistance
	Resting distance More...
float	MinimalDistance = -1
	Minimal distance. Use -1 to disable. More...
float	MaximalDistance = -1
	Maximal distance. Use -1 to disable. More...
float	Stiffness = 1
	Stiffness of the link, between 0 and 1. More...
float	TearSensitivity = -1
	Distance required to break the link. Use -1 to create an unbreakable link. More...
VerletPoint	A
	First verlet point More...
VerletPoint	B
	Second verlet point More...

Additional Inherited Members
Properties inherited from Drawing.SimpleLineSprite
Vector2	PositionA [get, set]
	Point Position A. More...
Vector2	PositionB [get, set]
	Point Position B. More...
float	Width [get, set]
	Line Width. More...

Detailed Description

Verlet breakable link.

Definition at line 9 of file VerletLink.cs.

Constructor & Destructor Documentation

VerletLink() [1/2]

VerletPhysics.VerletLink.VerletLink ( )

inline

Create an uninitialized verlet link.

Definition at line 37 of file VerletLink.cs.

        {
            this.world = null;
        }

VerletLink() [2/2]

VerletPhysics.VerletLink.VerletLink ( VerletWorld  world, VerletPoint  a, VerletPoint  b  )

inline

Create a simple verlet link.

Parameters

world	World
a	Point A
b	Point B

Definition at line 48 of file VerletLink.cs.

        {
            A = a;
            B = b;
            this.world = world;
 
            PositionA = A.GlobalPosition;
            PositionB = B.GlobalPosition;
 
            if (RestingDistance == 0)
            {
                // Calculate resting distance from points position
                RestingDistance = (PositionB - PositionA).Length();
            }
        }

Member Function Documentation

Constraint()

void VerletPhysics.VerletLink.Constraint ( )

inline

Apply link constraint on the two verlet points.

Definition at line 67 of file VerletLink.cs.

        {
            var diff = A.GlobalPosition - B.GlobalPosition;
            var d = diff.Length();
            var difference = (RestingDistance - d) / d;
 
            // Check for tear
            if (TearSensitivity > 0 && d > TearSensitivity)
            {
                world.QueueLinkRemoval(this);
            }
 
            // Check for min value
            if (MinimalDistance > 0 && d >= MinimalDistance)
            {
                // Do nothing
                return;
            }
 
            var imA = 1 / A.Mass;
            var imB = 1 / B.Mass;
            var scalarA = (imA / (imA + imB)) * Stiffness;
            var scalarB = Stiffness - scalarA;
 
            Vector2 computeMovement(float scalar)
            {
                var movement = diff * difference * scalar;
                if (MaximalDistance > 0)
                {
                    return movement.Clamped(MaximalDistance);
                }
                else
                {
                    return movement;
                }
            }
 
            A.GlobalPosition += computeMovement(scalarA);
            B.GlobalPosition -= computeMovement(scalarB);
 
            PositionA = A.GlobalPosition;
            PositionB = B.GlobalPosition;
        }

Member Data Documentation

A

VerletPoint VerletPhysics.VerletLink.A

First verlet point

Definition at line 27 of file VerletLink.cs.

B

VerletPoint VerletPhysics.VerletLink.B

Second verlet point

Definition at line 30 of file VerletLink.cs.

MaximalDistance

float VerletPhysics.VerletLink.MaximalDistance = -1

Maximal distance. Use -1 to disable.

Definition at line 18 of file VerletLink.cs.

MinimalDistance

float VerletPhysics.VerletLink.MinimalDistance = -1

Minimal distance. Use -1 to disable.

Definition at line 15 of file VerletLink.cs.

RestingDistance

float VerletPhysics.VerletLink.RestingDistance

Resting distance

Definition at line 12 of file VerletLink.cs.

Stiffness

float VerletPhysics.VerletLink.Stiffness = 1

Stiffness of the link, between 0 and 1.

Definition at line 21 of file VerletLink.cs.

TearSensitivity

float VerletPhysics.VerletLink.TearSensitivity = -1

Distance required to break the link. Use -1 to create an unbreakable link.

Definition at line 24 of file VerletLink.cs.

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

• scripts/verletphysics/VerletLink.cs