ifv-Project-11

sketch

//Isabelle Vincent
//Section E
//ifv@andrew.cmu.edu
//Project-11

function turtleLeft(d) {
    this.angle -= d;
}


function turtleRight(d) {
    this.angle += d;
}


function turtleForward(p) {
    var rad = radians(this.angle);
    var newx = this.x + cos(rad) * p;
    var newy = this.y + sin(rad) * p;
    this.goto(newx, newy);
}


function turtleBack(p) {
    this.forward(-p);
}


function turtlePenDown() {
    this.penIsDown = true;
}


function turtlePenUp() {
    this.penIsDown = false;
}


function turtleGoTo(x, y) {
    if (this.penIsDown) {
      stroke(this.color);
      strokeWeight(this.weight);
      line(this.x, this.y, x, y);
    }
    this.x = x;
    this.y = y;
}


function turtleDistTo(x, y) {
    return sqrt(sq(this.x - x) + sq(this.y - y));
}


function turtleAngleTo(x, y) {
    var absAngle = degrees(atan2(y - this.y, x - this.x));
    var angle = ((absAngle - this.angle) + 360) % 360.0;
    return angle;
}


function turtleTurnToward(x, y, d) {
    var angle = this.angleTo(x, y);
    if (angle < 180) {
        this.angle += d;
    } else {
        this.angle -= d;
    }
}


function turtleSetColor(c) {
    this.color = c;
}


function turtleSetWeight(w) {
    this.weight = w;
}


function turtleFace(angle) {
    this.angle = angle;
}


function makeTurtle(tx, ty) {
    var turtle = {x: tx, y: ty,
                  angle: 0.0,
                  penIsDown: true,
                  color: color(128),
                  weight: 1,
                  left: turtleLeft, right: turtleRight,
                  forward: turtleForward, back: turtleBack,
                  penDown: turtlePenDown, penUp: turtlePenUp,
                  goto: turtleGoTo, angleto: turtleAngleTo,
                  turnToward: turtleTurnToward,
                  distanceTo: turtleDistTo, angleTo: turtleAngleTo,
                  setColor: turtleSetColor, setWeight: turtleSetWeight,
                  face: turtleFace};
    return turtle;
}

function lines(t1){
  for(var j = 0; j<4;j++){
    t1.penDown();
    t1.forward(10);
    t1.left(180);
  }
}

function setup(){
  createCanvas(480,480);
}

function draw(){
  //inverse the stroke and bg colors
  var v = map(mouseY,0,height,0,255);
  var b = map(mouseY,height,0,0,255);
  background(v);
  var t1 = makeTurtle(mouseX,mouseY);
  t1.setColor(b);
  t1.setWeight(6);
  t1.penUp();
  //t1.forward(20);
  //t1.penDown();
  //t1.left(90);
  //t1.left(10);
  for(var i=0; i<1000; i++){
      t1.penUp();
      //go out from center
      var dist=(-(mouseY+mouseX)/2) +1 + i *1
      t1.forward(dist);
      //draw
      lines(t1);
      //come back
      t1.penUp();
      t1.left(180);
      t1.forward(dist);
      t1.left(180);

      //rotate by some angle
      t1.left(10);
  }
}