ShanWang-Project11-(click on the canvas)

For this project I’m interested in the dynamic shapes that the turtle graphic is able to produced. I selected a spiral base shape and users can click on the canvas to generate the geometry in different sizes.

sketch

//Shan Wang
//Section A
//shanw1@andrew.cmu.edu
//11-Project



function setup(){
    createCanvas(600,600);

}

function mousePressed(){
    alpha += 50;
    //randomly select the number of rotates the basic geometry will go
    var numRotate = random(30,60);
    //randomly choose the initial strokeWeight for turtle
    var strokeWei = random(0.2,1);
    //base the size of the graph on the number of rotation
    var size = map(numRotate,30,60,80,200);
    //base the initial gradient of stroke on the position of x
    var color = round(map(mouseX, 0, width, 150,200));

    //create a turtle at the position where the mouse is pressed
    var turtle1 = makeTurtle(mouseX,mouseY,color,strokeWei);

    //set the decrement unit for color and stroke weight
    var intervStro = turtle1.weight/numRotate;
    var intervCol = turtle1.color/numRotate;

    //generate the spiral
    for (var counts = 0; counts < numRotate; counts++){
        turtle1.penDown();
        turtle1.color -= intervCol;
        turtle1.weight -= intervStro;
        //draw square
        for (var j = 0; j<4; j++){
            turtle1.forward(size-counts*2);
            turtle1.right(90);
        }
        turtle1.left(10);
    }
}





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, tColor,tStroke) {
    var turtle = {x: tx, y: ty,
                  angle: 0.0,
                  penIsDown: true,
                  color: tColor,
                  weight: tStroke,
                  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 is one of the image I created.