// Dartmouth CS 2, Winter 2009, Chris Bailey-Kellogg
// Notes 13 | Sketch 2

int symm=3;      // degree of symmetry
int sz=20;       // size of chips
int rand=75;     // control of random chip generation
float a,da=0.01; // global rotation and increment

// The chips and the current one to be added
Chip[] chips = new Chip[100];
int current = 0;

void setup()
{
  size(400,400);
  noStroke();
  background(0);
  rectMode(CENTER);
  
  for (int i=0; i<chips.length; i++) chips[i] = new Chip();
}

void draw()
{
  background(0);
  translate(width/2, height/2);
  
  // Draw them
  for (int i=0; i<chips.length; i++) chips[i].draw(a);

  // The probability of a random chip is 1/rand
  if (random(rand) < 1) 
    addChip(random(width),random(height));
  
  // Rotate everyone
  a += da;
}

void mousePressed()
{
  addChip(mouseX, mouseY);
}

// Place the next available chip at (x,y)
void addChip(float x, float y)
{
  // Angle from center to (x,y)
  float dx = x - width/2;
  float dy = y - height/2;
  float ca = atan2(dy, dx) - a; // subtract out the current angle,
                                // since it'll be added right back in

  // Distance from center to (x,y)
  // This will be the new x coordinate upon rotation
  // (The new y coordinate will be 0)
  float cr = dist(x, y, width/2, height/2);

  // Add chip, and advance counter (wrapping around)
  chips[current].place(ca, cr, sz, symm);
  
  current = (current+1)%chips.length;
}

void keyPressed()
{
  if (key=='Z') {        // Bigger
    sz+=5;
  }
  else if (key=='z') {
    if (sz>5) sz-=5;
    if (sz<0) sz = 0;
  }
  else if (key=='S') {   // Higher symmetry
    symm++;
    println(symm+"-fold");
  }
  else if (key=='s') {
    if (symm>3) symm--;
    println(symm+"-fold");
  }
  else if (key=='R') {    // More random chips
    if (rand>5) rand-=5;
  }
  else if (key=='r') {
    rand+=5;
  }
  else if (key=='c') {    // Clear
    for (int i=0; i<chips.length; i++) chips[i].on = false;
    current = 0;
  }
}