Project-11 Composition-Veronica

sketch

//Veronica Wang
//Section B
//yiruiw@andrew.cmu.edu
//Project-11

var turtle = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]; 
var angle = 0; //current direction turtle is facing
var turnangle = 5; //turn angle
var incre = 0.1; //speed increment
var counter = 0; //how many times turtle had completed a full geometry

function setup() {
    createCanvas(480, 300);
    background(0);
    frameRate(10);

    //create array of turtles
    for (var i = 0; i < turtle.length; i++) {
       turtle[i] = makeTurtle(random(0, width), random(0, height), random(1, 3));
       turtle[i].setColor(color(random(255), random(255), random(255), 60));
    };
}

function draw() {
  //draw turtles
  for (var i = 0; i < turtle.length; i++) {
    turtle[i].penDown();
    turtle[i].setWeight(5);
    //change turtle direction after 100 instances
    if (counter < 100){
      if(angle < 0 || angle > 90){
            turnangle *= -5;
        }
      angle += turnangle;
      turtle[i].forward(1);
      turtle[i].right(turnangle);
      turtle[i].speed += incre;
      counter += 1;
    }
    turtle[i].speed += 0.5;
    turtle[i].forward(2);
    turtle[i].right(turnangle);
  }
    
}

function mousePressed(){
    turtle.push(makeTurtle(mouseX, mouseY, random(1, 3)))
    turtle[turtle.length - 1].setColor(color(random(255), random(100), random(255), 60));
    
}



//------------------------------------------------------------------------------------  


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

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

function turtleForward() {
    var rad = radians(this.angle);
    var newx = this.x + cos(rad) * this.speed;
    var newy = this.y + sin(rad) * this.speed;
    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) {
    var angle = this.angleTo(x, y);
    if (angle < 180) {
        this.angle += speed;
    } else {
        this.angle -= speed;
    }
}

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

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

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

function makeTurtle(tx, ty, vel) {
    var turtle = {x: tx, y: ty,
                  angle: 0.0, 
                  penIsDown: true,
                  color: color(128),
                  weight: 1,
                  speed: vel,
                  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;
}

In this project I wanted to make a somewhat random drawing machine that generates geometry based on rotation and random population. I liked the aggregation of triangles in this iteration and how the rotation made them look more circular/gear like.