import java.applet.*; 
import java.awt.*; 
import java.awt.image.*; 
import java.awt.event.*; 
import java.io.*; 
import java.net.*; 
import java.text.*; 
import java.util.*; 
import java.util.zip.*; 

public class solarSystem1 extends BApplet {

// solar system study
//
// click rotates to side-on view and zooms in towards sun
//
// moons have been removed for sake of speed

int zoom = -2500;
int zoomIncr = 25;

float a,b;
float xMouse, yMouse;

int totalPlanets = 9;

Planet[] planet = new Planet[totalPlanets];

float[] periods = {0.479f, 0.35f, 0.298f, 0.241f, 0.131f, 0.096f, 0.068f, 0.054f, 0.047f};
float[] distSun = {0.39f, 0.72f, 1.00f, 1.52f, 5.20f, 9.54f, 19.18f, 30.06f, 39.44f};
float[] sizes = {4.878f, 12.102f, 12.756f, 6.787f, 142.8f, 120.6f, 52.4f, 50.0f, 3.0f};

int[] reds = {200,200,1,255,150,125,1,1,150};
int[] greens = {180,255,100,50,100,150,1,175,150};
int[] blues = {100,100,255,1,1,50,255,255,150};

boolean click;

void setup(){
  size(400,400);
  background(0,0,51);
  noStroke();
  lights();
  ellipseMode(CENTER_RADIUS);
  
  g.lightKind[2] = AMBIENT;
  
  g.lightX[2] = 0;
  g.lightY[2] = 0;
  g.lightZ[2] = 0;
    
  g.lightR[2] = 1;
  g.lightG[2] = 1;
  g.lightB[2] = 0;
    
  g.lightKind[3] = DIFFUSE;
  
  g.lightX[3] = 0;
  g.lightY[3] = 0;
  g.lightZ[3] = 0;
  
  g.lightR[3] = 1;
  g.lightG[3] = 1;
  g.lightB[3] = 0;
  
  for (int i=0; i<totalPlanets; i++){
    planet[i] = new Planet(i, i, periods[i], distSun[i], sizes[i], reds[i], greens[i], blues[i]);
  }
}


void loop(){
  if (mousePressed){
    click = true;
  } else {
    click = false;
  }
  
  // smooths mouse movement
  xMouse -= (xMouse - (width/2 - mouseX)) * .2f;
  yMouse -= (yMouse - (height/2 - mouseY)) * .2f;
  
  // click zooms in towards sun
  if (click && zoom < -200){
    zoom += zoomIncr;
  } else if (!click && zoom > -2500){
    zoom -= zoomIncr;
  }
  
  if (click){    // orients to side view on click
    a -= (a - 0) * .2f;
    b -= (b - HALF_PI) * .2f;
  } else {
    a += xMouse / 1000.0f;
    b += yMouse / 1000.0f;
    
    if (a > PI){
      a -= TWO_PI;
    } else if (a < -PI){
      a += TWO_PI;
    }
    
    if (b > PI){
      b -= TWO_PI;
    } else if (b < -PI){
      b += TWO_PI;
    }
  }

    
  translate(width/2, height/2, zoom);
  rotateX(b);
  rotateY(a);
    
  // draw sun
  fill(255, 255, 0);
  sphere(100);
    
    
  for (int i=0; i<totalPlanets; i++){
    push();
    planet[i].move();
    pop();
  }
}


class Planet{
  float orbit, speed, distSun, mass;
  int r,g,b;
  int index;
  
  Planet (int i, float o, float s, float d, float m, int rd, int gr, int bl){
    orbit = o;
    speed = s/4.0f;
    distSun = (d*100.0f) + 200.0f;
    mass = m/2.0f;
    
    r = rd;
    g = gr;
    b = bl;
    
    index = i;
  }
  
  void move(){
    orbit += speed;
    if (orbit > PI){
      orbit -= TWO_PI;
    }
    
    rotateZ(orbit);
    translate(distSun,0,0);
    
    // sad and sloppy 3D clipping bandaid
    if (objectZ(0,0,0) < 250){
      render();
    }
  }
  
  
  void render(){
    noStroke();
    fill(r,g,b);
    
    sphere(mass);
    
    // add ring to Saturn (i know i know, jupiter and uranus and possibly neptune have rings too)
    if (index == 5){
      rotateY(0.4f);
      fill(r/2, g/2, b/2, 100);
      ellipse(0,0,mass*2.20f, mass*2.20f);
    }
  }
}
    


}