thorny branches

// Some color palette options to choose from

let myPalettes = [

  ["#eabfcb", "#c191a1", "#a4508b", "#5f0a87", "#2f004f"],

  ["#c3dfe0", "#bcd979", "#9dad6f", "#7d6d61", "#5e574d"],

  ["#4464ad", "#a4b0f5", "#f58f29", "#7d4600", "#466995"]

];

OPC.slider ('initial_size', 50, 20, 200, 1)

OPC.slider ('speed', 1, 0.1,5,0.1)

OPC.slider ('curliness', 1, 0.1, 5, 0.1)

OPC.slider ('avg_reduction', 0.5, 0.2, 2.0, 0.1)

OPC.palette('palette', myPalettes);

OPC.toggle ('auto_spawn', false);

OPC.button ('Clear', 'clear')

​

const batch_size = 20;

​

function criaPart (x, y) {

  let pos = createVector(x,y);

  let dir = createVector(speed,0);

  dir.rotate(random(radians(360)));

  return {pos, dir, r:initial_size, inc: random(avg_reduction*0.5,avg_reduction*2), 

          cor: random(palette)};

}

​

function movePart (part) {

  part.pos.add(part.dir);

  part.r = part.r - part.inc

  part.dir.rotate(radians(random(-10,10)*curliness))

  return part.pos.x >= 0 && 

         part.pos.x < width &&

         part.pos.y >= 0 && 

         part.pos.y < height && part.r > 1

}

​

function desenhaPart (part) {

  fill (part.cor)

  circle (part.pos.x, part.pos.y, part.r)

}

​

let p = [];

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  stroke(0,50)

   background(220);

}

​

function mousePressed() {

  if (mouseButton == CENTER) {

    p = [];

    background(220)

  }

  else 

    p.push (criaPart(mouseX,mouseY))

}

​

function mouseDragged() {

  if (mouseButton == LEFT) p.push (criaPart(mouseX,mouseY))

}

​

function draw() {

  //background (0,20)

  for (let i = 0; i < 10; i++) {  let q = []

  for (let part of p) {

    desenhaPart(part)

    if (movePart(part)) q.push (part)

  }

  p = q;

} 

  if (auto_spawn && p.length == 0) {

    create_batch();

  }

}

​

function create_batch() {

  let sz = height * 0.4;

  let center = createVector(width/2, height/2)

  for (let i = 0; i < batch_size; i++) {

    let v = createVector(random(sz),0);

    v.rotate(random(TWO_PI))

    v.x *= width/height;

    let q = center.copy().add(v);

    p.push (criaPart(q.x,q.y))

  }

}

​

function buttonPressed(variableName) {

  if (variableName == 'Clear') {

    p = [];

    background(220)

  }

}