コマ大数学科2011/8/23

komadai-math.pde

float ra=200;
float rb=ra/2;
float rc=ra/3;

float xa,ya,xb,yb,xc,yc;
float px, py;
float omega;
float t;
float vb, vc;
float phib, phic;

void setup(){
  size(800,800);
  background(255);
  xa = width/2;
  ya = height/2;
  omega = 1;
  t=0;
  vb = 7;
  vc = -17;
  phib = PI/3;
  phic = 0;
  smooth();
}

void draw(){
  //fill(255, 255, 255, 80);
  //rect(0, 0, width, height);
  translate(width/2, height/2);
  xa = ra*cos(omega*t);
  ya = ra*sin(omega*t);
  //stroke(255, 0, 0);
  //line(0, 0, xa, ya);
  //line(0, 0, xa, ya);
  xb = xa + rb*cos(omega*vb*t+phib);
  yb = ya + rb*sin(omega*vb*t+phib);
  //stroke(0, 255, 0);
  //line(xb, yb, xa, ya);
  xc = xb + rc*cos(omega*vc*t+phic);
  yc = yb + rc*sin(omega*vc*t+phic);
  //stroke(0, 0, 255);
  //line(xb, yb, xc, yc);
  fill(0);
  strokeWeight(3);
  stroke(0);
  if(t!=0)
  line(px, py, xc, yc);  


  px = xc;
  py = yc;
  t+=0.01;
}