Author: Austin Treu

atreu-proj-11

/*Austin Treu
  atreu@andrew.cmu.edu
  Section B
  Project 11*/

var turt, mouseTurt, colCount = 0, revTurt, uLine = false,
    colArr = ['purple','orange','blue','yellow','green','red','pink'];

function setup() {
    createCanvas(480, 480);
    background(250);

    //display title
    textSize(48);
    fill("green")
    textAlign(CENTER);
    text("Turtle Draw!", width/2, 50);
    textSize(15);
    text('Click to draw, Press Space to clear,', width/2, 80);
    text('Press Enter to change color', width/2, 95);


    //make turtles
    turt = makeTurtle(width/4, 60);
    turtL = makeTurtle(0,0);
    turtR = makeTurtle(width,height);
    turtT = makeTurtle(width,0);
    turtB = makeTurtle(0,height);
    mouseTurt = makeTurtle(0,0);
    revTurt = makeTurtle(width, height);
}

function draw() {
    //turtle to draw underline/outline
    if(!uLine){
        turt.penDown();
        turt.setColor('blue');
        turt.setWeight(10);
        if(turt.x < 3*width/4)
            turt.forward(2);
        else
            uLine = true;
    }

    //turtle corresponding with mouse pos
    if(mouseIsPressed){
        mouseTurt.penDown();
        revTurt.penDown();
    }
    else{
        mouseTurt.penUp();
        revTurt.penUp();
    }
    mouseTurt.setWeight(5);
    mouseTurt.goto(mouseX, mouseY);
    var ind = colCount%colArr.length;
    mouseTurt.setColor(colArr[ind]);

    revTurt.setWeight(5);
    revTurt.goto(width-mouseX, mouseY);
    var ind = colCount%colArr.length;
    revTurt.setColor(colArr[ind]);

    keyPressed();
}

function keyPressed(){
    //reset the screen 
    if(keyCode === 32){
        background(255);
        //display title
        textSize(48);
        fill("green")
        noStroke();
        textAlign(CENTER);
        text("Turtle Draw!", width/2, 50);
        uLine = false;
        turt.goto(width/4,60)
    }

    //cycle colors
    if(keyCode === 13)
        colCount++;

    keyCode = -1;
}

//TURTLE CODE
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 setColor(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: setColor, setWeight: turtleSetWeight,
                  face: turtleFace};
    return turtle;
}

I didn’t quite have an idea for what to do with this project at first, so I just started experimenting with the turtles and the mouse. Ultimately, I thought this was a pretty solid design that was fun to use.