Yingyang Zhou-Project-07-Curves

Curves

//Yingyang Zhou
//Section A
//yingyanz@andrew.cmu.edu
//Project-07


function setup() {
  createCanvas(480, 480);
}

function draw() {
  background(250);
  drawAstroid();
  drawEpispiral();
  drawRadialCurve();
  frameRate(20);

function drawAstroid(){
  push();
  translate(width/2, height/2);
  var a = 200;
  var b = 200;
  for(r = 0; r < 5; r++){
    rotate(r);
    noFill();
    strokeWeight(0.1);
    var red = map(r, 0, 3.14, 0, 255);
    stroke(red,0,255-red);
    beginShape();
    for (var t = 0; t < mouseX; t++){
      x = a*cos(t)*cos(t)*cos(t);
      y = a*sin(t)*sin(t)*sin(t);
      curveVertex(x + random(0, 1),y + random(0, 1));
    }
    endShape();
  }
  pop();
}
}

function drawEpispiral(){
  push();
  translate(width/2, height/2);
  var a = 60;
  var b = 20;
  var h = constrain(mouseX/2, 0, width/2);
  var r = mouseX/50;
  noFill();
  strokeWeight(0.5);
  stroke("red");
  beginShape();
  for (c = 0; c < 200; c++){
    var t = map(c, 0, 180, 0, TWO_PI);
    x = (a+b)*cos(t)-h*cos(c+t*(a+b)/b);
    y = (a+b)*sin(t)-h*sin(c+t*(a+b)/b);
    curveVertex(x, y);
  }
  endShape();
  pop();
}

function drawRadialCurve(){
  push();
  translate(width/2, height/2);
  beginShape();
  var angle = map(mouseX,0, width, 0, 360);
  rotate(radians(angle));
  var a = 50;
  for (var t = 0; t < 200; t +=2){
    stroke(t, 0, 0);
    strokeWeight(0.5);
    var x = 1/3*a*(2*cos(t)+cos(2*t));
    var y = 1/3*a*(2*sin(t)-sin(2*t));
    curveVertex(x,y);
  }
  endShape();
  pop();

}

In this project, I start using functions which make the code more readable and easier to revise if needed. I use three types of curves in this project all involving sin and cos but different from each other and have different movement along the changes of mouse position.