Month: November 2017

sketch

//Ashley Chan
//Section C
//ashleyc1@andrew.cmu.edu
//Assignment-10-B

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;

}

//rainbow shape
function makeShape(turtle) {

    //make one hexagon
    for(i = 0; i < 6; i++) {

        //rainbow colors
        var r = random(100, 255);
        var g = random(100, 255);
        var b = random(100, 255);
      

        turtle.setColor(color(r, g, b));
        turtle.setWeight(1);

        turtle.forward(50);
        turtle.left(60);

    }
}

//cream shape
function makeShape2(turtle2) {

    //make one shape
    for(i = 0; i < 8; i++) {

        turtle2.setColor(color(249, 237, 217));
        turtle2.setWeight(2);

        turtle2.forward(60);
        turtle2.left(80);

    }
}

//perriwinkle shape
function makeShape3(turtle3) {

    for(i = 0; i < 8; i++) {

        turtle3.setColor(color(172, 195, 249));
        turtle3.setWeight(1);

        turtle3.forward(60);
        turtle3.left(100);

    }
}


function setup() {
    createCanvas(480, 480);
    background(0);

     //name spiral motion
    var spiral = makeTurtle(200, 170);
    var shape2 = makeTurtle(320, 300);
    var shape3 = makeTurtle(120, 420);

    var angle = random(60, 140)
    var positionX = 0;

      //make a bunch of repeating shapes
      for(var i = 0; i < 80; i++) {

          makeShape(spiral);

          spiral.penUp();
          spiral.right(angle);
          spiral.forward(positionX);

          //draw again
          spiral.penDown();

          //increase space inbetween initial shapes the more you draw them
          positionX += 1; 
      
      }

      for(var j = 0; j < 10; j++) {

          makeShape2(shape2);

          shape2.penUp();
          shape2.right(angle);
          shape2.forward(6);
          shape2.penDown();
          }
      
        for (var k = 0; k < 80; k++ ) {
          makeShape3(shape3);

          shape3.penUp();
          shape3.right(angle * .5);
          shape3.forward(6);
          shape3.penDown();
          }
}

function draw() {

}

function mouseClicked() {

  setup();

}

I really like making spirographs. As a kid I doodled them all the time and a lot of the projects I’ve done for this class include spirographs but I like that I’m learning how to draw them through different techniques: this week via turtle graphics.

Slight alterations to the spirographs’ angles and spaces are changed when the mouse is clicked.

Iterations: