# Mimi Jiao – Project 11 – Section E

``````/*
Mimi Jiao
wjiao@andrew.cmu.edu
Section E
Project 11
*/

var toggle = 0; //toggle between images drawn
var increment = 0; //increment for moving turtle and drawing turtle

function setup() {
createCanvas(400, 400);
background(0);

}

function draw() {

//first drawing image
if (toggle === 0) {
for (var i = 0; i < 260; i ++) {
var play = makeTurtle(cos(i) * 100 + 200, 200 + sin(i) * 100);
play.penDown();
play.setColor(color(0, 255, 0));
play.right(increment);
play.forward(increment);
}
increment += 1;
if (increment > 850) {
fill(0)
rect(0, 0, width, height);
increment = 0;
}
}

//second drawing image
if (toggle === 1) {
for (var i = 0; i < 360; i ++) {
var play = makeTurtle(width / 2, 200 + sin(i));
play.penDown();
play.setColor(color(255, 0, 0));
play.left(increment);
play.forward(increment);

}
increment ++;
}

//third drawing image
if (toggle === 2) {
for (var i = 1; i <= 800; i ++) {
var play = makeTurtle(random(.1,.65) * 2**2 * cos(PI/i)/sin(PI/i),
2**cos(PI/i)/sin(PI/i)
);
play.penDown();
play.setColor(color(0, 0, 255));
play.right(i);
play.forward(i);
}
}

//fourth drawing image
if (toggle === 3) {
for (var i = 0; i < 360; i ++) {
//increment = map(mouseX, 0, windowWidth, 0, width);
var play = makeTurtle(random(400), random(400) + sin(i));
play.penDown();
play.setColor(color(255, 0, 255));
play.left(increment);
play.forward(increment);
}
increment += 1;
}

//fifth drawing image
if (toggle === 4) {
for (var i = 1; i <= 800; i ++) {
var play = makeTurtle(.45 * 2**2 * cos(PI/i)/sin(PI/i),
2**cos(PI/i)/sin(PI/i)
);
play.penDown();
play.setColor(color(0, 255, 255));
play.right(increment);
play.forward(increment);
}
increment += 1;
if (increment > 950) {
fill(0)
rect(0, 0, width, height);
increment = 0;
}
}

//image reset back to black
if (toggle === 5) {
fill(0);
rect(0, 0, width, height);
}

}

//if mouse is pressed, toggle between the drawn images
function mousePressed() {
toggle ++;
if (toggle > 5) {
toggle = 0;
}

}

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

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

function turtleForward(p) {
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: .005,
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;
}``````

I wanted to create something where you could toggle between states to see different drawings. I wanted to play with curves and spirals so I went back to mathworld.com to find some math equations.
Some process shots:  