float theta;
float dTheta;
Sun theSun;
float fps;

void setup() {
  size(480, 480);
  noStroke();
  colorMode(HSB, 360, 100, 100);
  theta = 0;
  dTheta = 0;
  theSun = new Sun(50, width / 2, height / 2);
}

void draw() {
  background(0, 0, 100);
  theSun.drawFigure();
  theSun.move();
}

class Sun {
  float d;                // 直径(50)
  float x;                // 中心のx座標(240)
  float y;                // 中心のy座標(240)
  Earth theEarth;
  Sun(float d, float x, float y) {
    this.d = d;
    this.x = x;
    this.y = y;
    theEarth = new Earth(0.6 * d, 150);    // 直径および回転の半径を与える
  }
  void move() {
    theEarth.move(x, y);         // 地球を動かす (太陽の周りを回るので太陽の位置を与える)
  }
  void drawFigure() {
    theEarth.drawFigure();       // Earthオブジェクトに描画を指示
    fill(30, 100, 100);
    ellipse(x, y, d, d);         // 自分自身を描画
  }
}

class Earth {
  float d;
  float x;
  float y;
  float x1;
  float y1;
  float radEarth;
  float orbitRadius = 100;
  Moon theMoon;
  Earth(float d, float x) {
    this.d = d;
    this.x = x;
    theMoon = new Moon (0.3 * d, 30);
  }
  void drawFigure() {
    fill(216, 86, 84);
    ellipse(x + 240, y + 240, d, d);
    theMoon.drawFigure();
  }
  void move(float x, float y) {
    theMoon.move(x, y);
    theta += 1;
    radEarth = radians(theta);
    this.x = orbitRadius * cos(radEarth);
    this.y = -orbitRadius * sin(radEarth);
  }
}

class Moon {
  float d;
  float x;
  float y;
  float x1;
  float y1;
  float x2;
  float y2;
  float radMoon;
  float orbitRadius = 30;
  Moon(float d, float x) {
    this.d = d;
    this.x = x;
  }
  void drawFigure() {
    fill(50, 69, 61);
    ellipse(x, y, d, d);
  }
  void move(float x, float y) {
    dTheta += 2;
    radMoon = radians(dTheta);
    this.x = x + orbitRadius * cos(radMoon);
    this.y = x - orbitRadius * sin(radMoon);
  }
}