//Fish and Flys
// Based on Mutual Attraction by Daniel Shiffman <http://www.shiffman.net>
// The Nature of Code, Spring 2007

// Demonstrates gravitational pull amongst a group of moving objects
// G ---> universal gravitational constant
// m1 --> mass of object #1
// m2 --> mass of object #2
// d ---> distance between objects
// F = (G*m1*m2)/(d*d)

//import noc.*;

//Perlin noise variables
float xoff = 0.0;
float yoff = 0.0;
float xincrement = 0.05; 
float yincrement = 0.01; 
float px;
float py;

PFont font;

int maxThings = 20;
int maxFood = 50;
float foodInc = 1;
float foodDec = -0.00009;
int maxAttractors = 10;
int trailAmount = 10;

int aNum = 4;
int pNum = 0;
int aMouse;

float nx;
float ny;

boolean showVectors = false;
boolean started = false;
boolean show = true;

ParticleSystem ps;
ParticleSystemFood psF;

int numDead = 0;
int foodTimer = 0;

void setup() {
  font = loadFont("Tahoma-12.vlw");
  textFont(font, 12); 
  size(640,480);
  //size(screen.width,screen.height);
  smooth();
  colorMode(RGB,255,255,255,100);

  ps = new ParticleSystem();
  psF = new ParticleSystemFood();
}

void draw() {
  fill(0,trailAmount);
  rect(0,0,width,height);

  ps.run();
  psF.run();

  
  if (foodTimer%100 == 0){
    psF.addParticle(1);
  }
  foodTimer++;
  xoff += xincrement;
  yoff += yincrement;
  stroke(0);

  fill(255);
  text((ps.total() - numDead) + "  Fish      " + psF.total() + "  Flies        M + Fish | N - Fish | B + Flies | V - Flies | R RESET", 10,height-10);
  //line(0,height/2,width,height/2);
}

void mousePressed() {

}
void mouseReleased() {
  //reset();
}
void keyPressed() {
  //  showVectors = !showVectors;

  if (key == 'r' || key == 'R'){
    started = false;
    aNum = 1;
    pNum = 0;
    reset();
  }
  else if(key == 's' || key == 'S'){
    showVectors = !showVectors;
  }
  else if (key == 'm'|| key == 'M'){
    ps.addParticle();
  }
  else if (key == 'b'|| key == 'B'){
    psF.addParticle(1);
  }  
  else if (key == 'n'|| key == 'N'){
    ps.delParticle(0);
  }
  else if (key == 'v'|| key == 'V'){
    psF.remParticle(0);
  }
  else if (pNum < aNum){
    pNum = aNum;
    aNum++;
    if (aNum == maxAttractors){
      aNum--;
      pNum = maxAttractors;
    }
  }
  else{
    aNum--;
    if(aNum == 0 ){
      pNum = 0;
      aNum++;
    }
  }
} 

// Renders a vector object 'v' as an arrow and a location 'loc'
void drawVector(Vector3D v, Vector3D loc, float scayl) {
  if (v.magnitude() > 0.0) {
    pushMatrix();
    float arrowsize = 4;
    // Translate to location to render vector
    translate(loc.x,loc.y);
    stroke(255);
    // Call vector heading function to get direction (note that pointing up is a heading of 0) and rotate
    rotate(v.heading2D());
    // Calculate length of vector & scale it to be bigger or smaller if necessary
    float len = v.magnitude()*scayl;
    // Draw three lines to make an arrow (draw pointing up since we've rotate to the proper direction)
    line(0,0,len,0);
    line(len,0,len-arrowsize,+arrowsize/2);
    line(len,0,len-arrowsize,-arrowsize/2);
    popMatrix();
  }
}

void reset(){
  for (int i = 0; i < ps.total(); i++){
    ps.delAllParticles(i);
  }
  for (int i = 0; i < psF.total(); i++){
    psF.delParticle(i);
  }    
  ps = new ParticleSystem();

  psF = new ParticleSystemFood(); 
}