Romi Jin – Project-11-Composition

sketch

/*
Romi Jin
Section B
rsjin@andrew.cmu.edu
Project-11
*/


function setup() {

    createCanvas(480, 480);
    background("black");

}

function draw() {

    var myTurtle = makeTurtle(width/2, height/2);
    myTurtle.penDown();
    myTurtle.setColor("white");
    myTurtle.setWeight(0.05);
    strokeJoin(MITER);
    strokeCap(PROJECT);
    var step = 1; //different patterns

    for (i = 0; i <= 150; i++) { 

        //flower drawing
        myTurtle.forward(step);
        myTurtle.left(step);
        myTurtle.forward(step);
        myTurtle.left(step);
        myTurtle.forward(step);
        myTurtle.left(step);
        myTurtle.forward(step);
        myTurtle.left(step);

        //angle
        myTurtle.right(200);
        //spacing
        myTurtle.forward(i*3);
    }

}


/////////////////////////////////////////////////////////////

//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 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 decided to play around with angles and lines and see what kind of shapes I could make with different patterns and sizing. I eventually ended up with a flower / pinwheel, drawn spiraling out to a certain angle. It was interesting to see the difference between using turtle graphics to draw this versus not using it.