Project-11-Composition

For this project, I thought of how the turtle could respond to the mouse and I really liked the idea of a drawing pad, and so I recreated that. The turtle follows the mouse and draws as the mouse moves. It is similar to the snake assignment, but in some aspects was easier for me to understand how it worked.

sketch

//Rebecca Enright
//Section A
//renright@andrew.cmu.edu
//turtle project

//global location variable

var x = 0;
var y = 0;

function setup() {
	createCanvas(400,400);
	background(75, 175, 255);

}

function draw() {
    var t1 = makeTurtle(x, y);
	  t1.penDown();
	  t1.right(90);
	  t1.setColor(255);
    //reassign x and y to = mouseX and mouseY so it draws
	  t1.goto(mouseX, mouseY);
	  x = mouseX;
    y = mouseY; 

}

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;
}