// Learning Processing
// Daniel Shiffman
// http://www.learningprocessing.com

// Example 14-18: Object-oriented solar system

class Planet {
  
  // Each planet object keeps track of its own angle of rotation.
  float theta;      // Rotation around sun
  float diameter;   // Size of planet
  float distance;   // Distance from sun
  float orbitspeed; // Orbit speed
  
  
  // Set our control vars
  int earthYearLength = 365;
  int earthDiameter = 12756;
  
  Planet(float distance_, int diameter_, float yearLength_) {
    
    distance = distance_;
    theta = random(0,TWO_PI); // Set the orbit to random so they don't all start in a line    
        
    diameter = calculateDiameter(diameter_, earthDiameter);  
    orbitspeed = calculateOrbitSpeed(yearLength_);
    
    sphereDetail(8); // Knock level of detail down so we run tings faster.
  
  }
  
  void update() {
    
    // Increment the angle to rotate
    theta += orbitspeed;
  
  }
  
  void display() {
    
    noStroke();
    // Before rotation and translation, the state of the matrix is saved with pushMatrix().
    pushMatrix(); 
    // Rotate orbit
    rotate(theta); 
    // translate out distance
    translate(distance,0); 
    fill(100);
    sphere(diameter);
    // Once the planet is drawn, the matrix is restored with popMatrix() so that the next planet is not affected.
    popMatrix(); 
  
  }
  
  float calculateOrbitSpeed(float yearLength){

    // fuck about so the orbitspeed is something like normal
    return yearLength*0.005;
  
  }
  
  float calculateDiameter(float diameter, int control){
    
    // add 3 so we can actually see the bloooomin results
    return (diameter/control)+2;
    
  }


}