function island (x, y, r, type)

{

  this.r = r;

  this.x  = x;

  this.y = y;

  this.type = type;

  this.show = function() {

    fill(255, 50, 50);

    stroke(255, 50, 50);

    strokeWeight(4);

    ellipse(this.x, this.y, 20, 20);

    let description = "";

    if (this.type < 0) {

      description = "valley";

    } else if (this.type < 1) {

      description = "hill";

    } else {

      description = "mountain";

    }

    textFont('Helvetica');

    textStyle(BOLDITALIC);

    fill(255, 50, 50);

    textSize(10);

    noStroke();

    textAlign(CENTER, TOP);

    text("this is a " + description, this.x, this.y + 15);

  }

}

​

​

function setup() {

  createCanvas(640, 640);

  boolDoRefresh = true;

  anIsland = new island(100, 100);

  d = pixelDensity();

  Pscale = d*4;

  scaling = 1200;

  levels = 7;

  levelsStep = 35; 

}

​

function islandGen(num) {

  //generate an island with random radius, random location

  //+1 => mountain, -1 => valley

  let islands = [];

  for (let i = 0; i < num; i ++) {

    let newIsland = new island (random(width), random(height), random(30,65), random([1,0.3,0.5,1,-0.1,-0.3]));

    islands[i] = newIsland;

  }

  return islands;

}

​

function calcIslandColor(sum, l, ls) {  //level, levelStep

  //do it on grayscale first

  for (let i = 0; i < l; i ++) {

    if (i * ls > sum ) {

      return color(i * ls);

    } 

  } 

  return color(l*ls); 

}

​

function draw() {

  if (boolDoRefresh) {

    //lala init 

    background(220);

    let pink = color(255, 102, 204);

    let wid = width*d*4;

    let high = height*d*4;

    let islandCount = random(6, 12);

    let islands = islandGen(islandCount);

    let maxsum = 0;

    let colordist = color("green");

    print("init");

    //

    loadPixels();

    //Thanks to *Coding Challenge #28: Metaballs! https://www.youtube.com/watch?v=ccYLb7cLB1I

    for (let y = 0; y < high; y += 4) {

      for (let x = 0; x < wid; x+= 4){

        let i = y * width*2 + x; 

        let sum = 0;

        for (let j = 0; j < islandCount; j++) {

          let distance = dist(x, y, islands[j].x*Pscale, islands[j].y*Pscale);

          sum += scaling* islands[j].r*islands[j].type/distance;

        }

​

        let colordist = calcIslandColor(sum, levels, levelsStep); 

        //let colordist = color(scaling*sum);

        pixels[i] = red(colordist);

        pixels[i + 1] = green(colordist);

        pixels[i + 2] = blue(colordist);

        pixels[i + 3] = alpha(colordist);

      }

    }

​

    updatePixels();

  /*debugg

  print(maxsum);

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

    islands[i].show();

  }

  */

  //FINAL UI-----------------------------------

  islands[0].show();

  //grids

  stroke(255);

  strokeWeight(1);

  for (let q = 0; q<6; q++) {

    line(q*width/6, 0, q*width/6, height);

    line(0, q*height/6, width, q*height/6);

  }

​

  //coordinates

  textFont('Helvetica');

  textStyle(BOLDITALIC);

  fill(255, 50, 50);

  textSize(18);

  noStroke();

  textAlign(LEFT, TOP);

  let NS = str(int(random(90))) + '° '+ str(int(random(1000, 9999))) + "' "+  str(int(random(90))) + '" ' + random(["N", "S"]);

  let EW = str(int(random(90))) + '° '+ str(int(random(1000, 9999))) + "' "+  str(int(random(90))) + '" ' + random(["E", "W"]);

  text(NS, 50, 50);

  text(EW, 50, 70);

  //legend

  strokeWeight(2);

  stroke(255);

  for (let i = 0; i < levels; i++) {

    fill(i*levelsStep);

    rect(590, 590 -i*20, 20, 20);

  }

  textFont('Helvetica');

  textStyle(BOLD);

  fill(255, 50, 50);

  noStroke();

  textSize(10);

  textAlign(RIGHT, TOP);

  text("-200", 580, 600);

  textAlign(RIGHT, BOTTOM);

  text("+500", 580, 480);

​

    boolDoRefresh = false;

  }

}

​

function mousePressed() {

  boolDoRefresh = true;

}9