Project 11 – Simin Li

siminl-project11

// Simin Li
// Section C
// siminl@andrew.cmu.edu
// Project 11
var seaTurtle;
//create a turtle
function setup() {
    createCanvas(600, 400);
    background(21,40,71);
    seaTurtle = makeTurtle(300,200);
    //make a turtle
}
function draw(){
    strokeJoin(MITER);
    strokeCap(PROJECT);
    for(var i = 0; i < 6; i++){
        seaTurtle.penUp();
        seaTurtle.right(60);
        seaTurtle.forward(random(70,200));
        var snowFlakeSize = random(1,8);
        snowFlake(snowFlakeSize);
    }
}

function mouseReleased() {
//when mouse is clicked, redraw 6 snowflakes according to the mouse position
  seaTurtle.penUp();
  seaTurtle.goto(mouseX,mouseY);
  println(mouseX);
  for(var i = 0; i < 6; i++){
  //draw six snowflakes
        seaTurtle.penUp();
        seaTurtle.right(60);
        seaTurtle.forward(random(70,200));
        //randomize how far apart each snowflake is from each other
        var snowFlakeSize = random(1,10);
        //randomize the size of the snowflakes
        snowFlake(snowFlakeSize);
    }
}
function snowFlake(a){
    seaTurtle.penDown();
//draw snow flake with dimension of a 
    if(a < 5){
    //if a is smaller than 5 fill it with white
    seaTurtle.setColor(255);
    }
    else{
    //else fill it with a randomized shade of blue
        seaTurtle.setColor(color(random(0,100),random(100,255),255));
    }
    for(var i = 0; i < 6; i ++){
        patternA(a);
    }
    noLoop();

}
    
function patternA(a){
    //draw branch of snowflake with dimension a
    seaTurtle.penDown();
    seaTurtle.setWeight(a / 5);
    //determine line weight according to the size
    seaTurtle.left(30);
    seaTurtle.forward(5 * a);
    seaTurtle.left(60);
    seaTurtle.forward(3 * a);
    seaTurtle.left(45);
    seaTurtle.forward(4 * a);
    seaTurtle.right(45);
    seaTurtle.forward(a / sqrt(2));
    seaTurtle.right(90);
    seaTurtle.forward(a / sqrt(2));
    seaTurtle.right(45);
    seaTurtle.forward(3 * a);
    seaTurtle.left(135);
    seaTurtle.forward(2 * a);
    seaTurtle.left(45);
    seaTurtle.forward(4 * a);
    seaTurtle.right(45);
    seaTurtle.forward(a / sqrt(2));
    seaTurtle.right(90);
    seaTurtle.forward(a / sqrt(2));
    seaTurtle.right(45);
    seaTurtle.forward(3 * a);
    seaTurtle.left(135);
    seaTurtle.forward(2 * a);
    seaTurtle.left(30);
    seaTurtle.forward(2 * a);
    seaTurtle.right(60);
    seaTurtle.forward(2 * a);
    seaTurtle.right(60);
    seaTurtle.forward(2 * a);
    seaTurtle.right(60);
    seaTurtle.forward(2 * a);
    seaTurtle.right(60);
    seaTurtle.forward(2 * a);
    seaTurtle.left(30);
    seaTurtle.forward(2 * a);
    seaTurtle.left(135);
    seaTurtle.forward(3 * a);
    seaTurtle.right(45);
    seaTurtle.forward(a / sqrt(2));
    seaTurtle.right(90);
    seaTurtle.forward(a / sqrt(2));
    seaTurtle.right(45);
    seaTurtle.forward(4 * a);
    seaTurtle.left(45);
    seaTurtle.forward(2 * a);
    seaTurtle.left(135);
    seaTurtle.forward(3 * a);
    seaTurtle.right(45);
    seaTurtle.forward(a / sqrt(2));
    seaTurtle.right(90);
    seaTurtle.forward(a / sqrt(2));
    seaTurtle.right(45);
    seaTurtle.forward(4 * a);
    seaTurtle.left(45);
    seaTurtle.forward(3 * a);
    seaTurtle.left(30);
    //draw pattern A
}

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;
}
 

For this project I wanted to use turtles to draw a complex shape that would be otherwise difficult to achieve through other methods. The shape of a snowflake seemed beautiful and intriguing to me.