// title: doodle
// discription: This is a webbased non-printing verson of the 
//   Collaborative Computer Generated Continuous Line Wall Doodle, 2006
// author: Matthew Nelson
// date: 05/2006

float cx=0;
float cy=0;
float px=0;
float py=0;
float angle;
float distance=2.0;
float angle_inc=0.1;
boolean ready=false;

void setup()
{
  size(600,400);
  background(255);
  framerate(100);
  noLoop();
  smooth();
  fill(0);
  strokeWeight(3);
  start_up();
  px=cx;
  py=cy;
  ready=false;
}

void draw()
{
  line(cx, cy, px, py);
  check();
  drawing();
}

void drawing()
{
  px=cx;
  py=cy;
  check_mouse();
  cx=get_x(distance,angle,px);
  cy=get_y(distance,angle,py);
}

float get_y(float distance, float degree, float prev_y)
{
  float y=distance*cos(degree) + prev_y;
  return y;
}

float get_x(float distance, float degree, float prev_x)
{
  float x=distance*sin(degree) + prev_x;
  return x;
}

void check()
{
  if(cx>width | cx<0)
  {
    noLoop();
    delay(6000);
    setup();
  }
  else if(cy>height | cy<0)
  {
    noLoop();
    delay(6000);
    setup();
  }
}

void start_up()
{
  float i=random(0,4);
  switch(int(i))
  {
  case 0:  //Top
    cx=random(25,width-25);
    cy=0;
    angle=0.0;
    drawing();
    break;
  case 1:  //Right
    cx=width;
    cy=random(25,height-25);
    angle=-1.57;
    drawing();
    break;
  case 2:  //Bottom
    cx=random(25,width-25);
    cy=height;
    angle=3.14;
    drawing();
    break;
  case 3:  //Left
    cx=0;
    cy=random(25,height-25);
    angle=1.57;
    drawing();
    break;
  }
}

void keyPressed()
{
  switch(keyCode)
  {
  case LEFT:
    if(ready == true)
    {
      angle=angle+angle_inc;
      drawing();
    }  
    break;
  case RIGHT:
    if(ready == true)
    {
      angle=angle-angle_inc;
      drawing();
    }
    break;
  case ENTER:
    ready = true;
    loop();
    break;
  }
}

void mousePressed() 
{
  ready=true;
  loop();
}

void check_mouse()
{
  if(mouseX > pmouseX)
  {
    angle=angle+angle_inc;
  }
  else if(mouseX < pmouseX)
  {
    angle=angle-angle_inc;
  }
}