pendulum

var scrollX=0;

var level=0;

var r=0;

var speed=10;

var y=200;

var swing=0;

var rot=1;

var k=3;

var hm=130;

function setup() {

  createCanvas(1000, 400);

  background(100);

  angleMode(DEGREES);

}

function draw() {

  background(100);

    scrollX-=speed;

  rect(0,0,1000,30);

    text(k*sqrt(-hm+170*cos(r)),0,200);text(-sqrt(-hm+170*cos(r)),0,300);

    //rotate(r);

    translate(500,30);

    if(rot==1){rotate(r);line(0,y-30,0,0);      

                 if(r>0){r+=k*sqrt(-hm+170*cos(r))}else{r+=-sqrt(hm-170*cos(r))}

               //r+=1;if(r>0){speed-=1;speed+=0.1}if(r<0){speed-=-1;speed-=0.1;}

              }

        ellipse(0,y,50)

​

}