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pair coilpoint(real lambda, real r, real t)
{
return (2.0*lambda*t+r*cos(t),r*sin(t));
}
guide coil(guide g=nullpath, real lambda, real r, real a, real b, int n)
{
real width=(b-a)/n;
for(int i=0; i <= n; ++i) {
real t=a+width*i;
g=g..coilpoint(lambda,r,t);
}
return g;
}
void drawspring(real x, string label) {
real r=8;
real t1=-pi;
real t2=10*pi;
real lambda=(t2-t1+x)/(t2-t1);
pair b=coilpoint(lambda,r,t1);
pair c=coilpoint(lambda,r,t2);
pair a=b-20;
pair d=c+20;
draw(a--b,BeginBar(2*barsize()));
draw(c--d);
draw(coil(lambda,r,t1,t2,100));
dot(d);
pair h=20*I;
draw(label,a-h--d-h,red,Arrow,Bars,PenMargin);
}
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