* with pre-chosen number of sides.

 */

​

// Display parameters

var cnv = {w : screen.height,  h : screen.height};

​

// Globally accessible vectors

var _verts = [];

var _edges = [];

var _pt;

​

// The constants

const PI = Math.PI;

const sides = 3;  // change this

const init_angle  = PI/2.0; //change this

const frac = 0.5;  // change this

​

const rad = 0.4*cnv.h;

const angle = 2.0*PI/sides;

​

function isOutside(x,y) {

  // console.log(x,y);

  let cnt = 0;

  for(let i = 0; i < sides; i++) {

    let m = _edges[i][0];

    let c = _edges[i][1];

    if((y < (m*x + c) && c >= 0) || (y > (m*x + c) && c < 0)) {

      cnt++; 

    }

  }

  if(cnt == sides) return false;

  else return true;

}

​

function setup() {

​

  // put setup code here

  var cnvs = createCanvas(cnv.w,cnv.h);

​

  background(0);

  fill(255, 255, 255);

  text("Sides = "+sides+", ratio = "+frac+", orientation = "+degrees(init_angle)+"\u00B0", 5, 15);

  stroke(255);

  strokeWeight(1);

  // Draw the polygon with 'sides'

  translate(cnv.w/2,cnv.h/2);

  scale(1.0,-1.0);

  rotate(init_angle);

  for(let i = 0; i < sides; i++) {

    _verts.push(createVector(rad*cos(i*angle),rad*sin(i*angle)));

    point(_verts[i]);

  }

  for(let i = 0; i < sides; i++) {

    let m = (_verts[(i+1)%(sides-1)].y - _verts[i].y)/(_verts[(i+1)%(sides-1)].x - _verts[i].x);

    let c = _verts[i].y - m*_verts[i].x;

    _edges.push([m,c]);

  }

​

  // Choose an initial point within

  var randr,randt,randx,randy;

  var itercnt = 0;

  while(true) {

    if(itercnt++ > 50) {

      console.log("Terminating execution: limit reached while generating the initial point [50]");

      remove();

    }

    randr = random(0,rad);

    randt = random(0,TWO_PI);

​

    randx = randr*cos(randt);

    randy = randr*sin(randt);

    // console.log(randx,randy);

    if(!isOutside(randx,randy)) break;

  }

  _pt = createVector(randx,randy);

}

​

function draw() {

  translate(cnv.w/2,cnv.h/2);

  scale(1.0,-1.0);

  rotate(init_angle);

  // Choose a vertex at random

  let rand_vert = parseInt(random(sides));

  let _vert = _verts[rand_vert];

​

  let mid = p5.Vector.add(_vert,p5.Vector.mult(p5.Vector.sub(_pt,_vert),frac));

  point(mid);

  _pt = mid.copy();

  // if(frameCount >= 12600) {

  //   capturer.stop();

  //   capturer.save();

  //   noLoop();

  // }

  // else capturer.capture(canvas);

}