public SpringConstraint( Particle p1, Particle p2 )
{
this.p1 = p1;
this.p2 = p2;
restLength = p1.Curr.Distance( p2.Curr );
stiffness = 0.5;
visible = true;
}
public AngularConstraint( Particle p1, Particle p2, Particle p3 )
{
pA = p1.Curr;
pB = p2.Curr;
pC = p3.Curr;
lineA = new Line( pA, pB );
lineB = new Line( pB, pC );
// lineC is the reference line for getting the angle of the line segments
pD = new Vector( pB.X + 0, pB.Y - 1 );
lineC = new Line( pB, pD );
// theta to constrain to -- domain is -Math.PI to Math.PI
targetTheta = CalcTheta( pA, pB, pC );
// coefficient of stiffness
stiffness = 1;
}