mreyes-project-11-turtle drawing tool

sketch

//Mercedes Reys

//Section C 

//mreyes@andrew.cmu.edu

//project-11

//trutle varaibles 
var t1;
var t2;
var t3;
var t4;
function setup() {

    createCanvas(800, 800);
    background('pink');
    //turtles 
    t1 = makeTurtle(width / 2 , height / 2);
    t2 = makeTurtle(width / 2 , height / 2);
    t3 = makeTurtle(width / 2 , height / 2);
    t4 = makeTurtle(width / 2 , height / 2);
  
}
 
function draw() {
//turtles move forward twards target 
    t1.forward(1);
    t2.forward(1);
    t3.forward(1);
    t4.forward(1);
// target is mouse location
    var targetX = mouseX;
    var targetY = mouseY;
    strokeWeight(1);
    stroke(128);
// turtles move tward target but at varying amounts 
    t1.turnToward(targetX, targetY,1);
    t2.turnToward(targetX, targetY,2);
    t3.turnToward(targetX, targetY,3);
    t4.turnToward(targetX, targetY,4);


}


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;}

I wanted to make a little interactive turtle sketch that would draw follow your mouse and draw varying compositions. The code is simple, but I think the program is fairly intuitive and entertaining. Depending on how you move your mouse around and how long you play with it the composition can get messy, but overall it generates fairly pleasing designs.