PFont font;


void setup(){
size(400,400);
background(255);
font = loadFont("Times-Roman-20.vlw");
frameRate(100);
smooth();
}

float t=0;
float a,b,c,d;
float r=30;

void dash(float x,float y0,float y1){
for(float y=y0;y<y1;y=y+10){
line(x,y,x,min(y1,y+5));}}

void cyl(int y, int d){
line(60,y-d,60,y-20);
line(60,y-20,140,y-20);
line(140,y-20,140,y-4);
line(140,y+4,140,y+20);
line(140,y+20,60,y+20);
line(60,y+20,60,y+d);
}


void draw(){

fill(255);
rect(0,0,400,400);
stroke(0);
  translate(50,0);
a=r*sin(t);
b=r*sin(t+2*PI/3);
d=-a/2;
c=2*d-b;
line(a+200,100,d+200,250);
line(b+200,300,c+200,200);
cyl(100,4);
cyl(200,0);
cyl(300,4);
strokeWeight(2);
line(a+200,100,a+25,100);
line(b+200,300,b+25,300);
line(c+200,200,c+100,200);
strokeWeight(5);
line(a+100,84,a+100,116);
line(b+100,284,b+100,316);
line(c+100,184,c+100,216);
strokeWeight(1);

line(200,350,r*sin(t)+200,r*cos(t)+350);
dash(r*sin(t)+200,100,r*cos(t)+350);
line(200,350,r*sin(t+2*PI/3)+200,r*cos(t+2*PI/3)+350);
dash(r*sin(t+2*PI/3)+200,300,r*cos(t+2*PI/3)+350);
line(200,350,r*sin(t+4*PI/3)+200,r*cos(t+4*PI/3)+350);
dash(r*sin(t+4*PI/3)+200,200,r*cos(t+4*PI/3)+350);


fill(0);
ellipse(a+200,100,10,10);
ellipse(200,200,10,10);
ellipse(d+200,250,10,10);
ellipse(b+200,300,10,10);
ellipse(c+200,200,10,10);
textFont(font);
fill(0);
text("A",a+205,95);
text("B",b+205,295);
text("C",c+205,195);
text("O",205,195);
text("D",d+205,245);
text("Cylinder A",55,140);
text("Cylinder B",55,340);
text("Cylinder C",55,240);
t=t+0.01;
}