Elena Deng-Project 11-Turtles

sketch

/*Elena Deng
Section E
  edeng1@andrew.cmu.edu
  Project-11
}
*/

var t = [];
function setup() {
    createCanvas(400, 400);
    background(10);
    for(var i = 0; i < t.length; i++){ //sets various numbers of turtles
        t[i] = makeTurtle(width/2, height / 2 + random(-100, 100));
        t[i].setColor(color(random(200), random(200), random(150), 100));

    }
}

function draw() {
    var targetX = mouseX + noise(frameCount / 100); //sets the target
    var targetY = mouseY + noise(frameCount / 100);

    strokeWeight(5);

    point(targetX, targetY); //turtle will always be inclined to go to target x and y

    for (var a = 0; a < t.length; a++){
      t[a].setWeight(random(1,5))
      t[a].penDown();
      t[a].forward(1.5);
      t[a].turnToward(targetX, targetY,1);
        t[a].left(random(-5,5));} //draws the turtle
}

function mousePressed(){ //sets the number of turtles and increases it when mouse is pressed
  var newTurtle = makeTurtle(mouseX, mouseY);
  newTurtle.setColor(color(random(150), random(150), random(20), 100));
	t.push(newTurtle); //push turtle into t array

}

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

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;
}

This week I was really excited to revisit the concept of turtles. I wanted to revisit the lines seen in the title notes from class. If you click on the screen, a new line will form and attempt to follow the mouse location. Continue clicking and you can see the way the turtle attempts to reach the mouse location more clearly.