Miranda-Luong-Project 11

/* Miranda Luong
Section E
mluong@andrew.cmu.edu
Project-11-Composition
*/

var myTurtle

function setup() {
createCanvas(480, 480);
background(0);
myTurtle = makeTurtle(width/2,height/2); //places starting turtle at center
myTurtle.setColor('black');
myTurtle.setWeight(6);
}

// When the user clicks the mouse
function mousePressed() {
//turtle moves to mouse
myTurtle.goto(mouseX,mouseY);
//if mouse is south of canvas' horizontal center, pen is red
if (mouseY > height/2){
myTurtle.setColor('red');
}
//if mouse is north of canvas' horizontal center, pen is blue
if (mouseY < height/2){
myTurtle.setColor('blue');
}
//size of circle is random from range between 5 and 20
var size = random(5,20);
//draw circle
for (var i = 0; i < 360; i+=size){
myTurtle.penDown();
myTurtle.right(size);
myTurtle.forward(10);
myTurtle.penUp();
}
}

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: 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;
}

I went for a pretty simple drawing. When a visitor clicks on the canvas, a circle is drawn. The colors of these circles change according to where they clicked.

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