NatalieKS-Project-11

snow

//Natalie Schmidt
//nkschmid@andrew.cmu.edu
//Section D
//Project-11

//coordinates for the falling snowflakes
//adapted from code here:
//http://alpha.editor.p5js.org/projects/rkBAHA3h
var position = {
    x: 133,
    y: 68
};
//to help move the snowflakes
var gravity = 1;

//--------TURTLE FUNCTIONS-------
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;
}


function setup() {
    createCanvas(480, 480);
    frameRate(10);
    background(138, 172, 224);
}

function draw() {
    fill(255);
    noStroke();
    //create the snowflakes in the background
    var transparency = random(10, 255);
    fill(255, transparency);
    position.x = random(0, width);
    position.y = random(0, 400);
    ellipse(position.x, position.y, 5, 5);
    //left snow hill
    ellipse(0, height, 300, 300);
    //right snow hill
    ellipse(width, height, 300, 300);
    //left middle snow hill
    ellipse(175, height, 200, 200);
    //right middle snow hill
    ellipse(300, height, 250, 250);

}

function mousePressed() {
  var posY = mouseY;
  //set the snowflake
  var snowflake1 = makeTurtle(mouseX, posY);
  posY += 1;
  snowflake1.penDown();
  snowflake1.setColor(255);

//draw snowflakes; used the turtle graphics template from the
//Turtle Graphics page on the website
      for (var i = 0; i < 200; i++) {
          snowflake1.forward(40);
          snowflake1.left(190);
          snowflake1.forward(10);

          if (i % 30 == 0) {
              snowflake1.forward(20);
          }
      }
}

For this project, I was inspired by something that happened today: it snowed! Well, barely, but I was still really excited. I started playing around with the turtle, moving it forward and right and such to see what kind of shape it would give me, and I ended up with a snowflake-like shape. I really like the outcome of this project, I think the background with the snowflake-turtle looks really pretty! As time goes on, the background will be (almost) completely filled by the background “snowflakes,” so it looks like a snowstorm.

Here is what it looks like after some time: