numStorms = 4;

terrain = [];

res = 5;

gridW = 64;

gridH = 64;

maxHt = 360;

minHt = 0;

​

function defineStorm(i){

  coord = [0,0];

  coord[0] = int(random(gridW))

  coord[1] = int(random(gridH))

  return coord

}

function setStorms(){

  for (i = 0; i < numStorms; i++){

    storms[i] = defineStorm(i)

  }

}

​

function make2Darray(cols, rows) {

  var arr = new Array(cols);

  for (var i = 0; i < arr.length; i++) {

    arr[i] = new Array(rows);

  }

  return arr;

}

​

function setup() {

  createCanvas(gridW*res, gridH * res);

  terrain = make2Darray(gridW, gridH);

  setTerrain();

  setStorms();

  stroke(0)

  strokeWeight(1)

  noLoop()

  colorMode(HSB, 255, 255, 255, 1);

}

​

function setTerrain(){

  for (i = 0; i< gridW ;  i += 1 ){

    for (j = 0;  j < gridH ; j += 1){

      ht = defineTerrain(i*res,j*res);

      terrain[i][j] = ht;

    }

  }

}

​

function drawTerrain(){

  for (i = 0; i< gridW ;  i += 1 ){

    for (j = 0;  j < gridH ; j += 1){

      fill(defineColor(terrain[i][j]));

      //defineColor(defineTerrain(x,y))

      rect(i*res,j*res,res,res)

    }

  }

}

​

function drawStorms(){

  for (i = 0; i < storms.length; i ++){

    storm = storms[i];

    stroke(150,255,255,1)

    fill(150,255,255,0.15)

    rect(storm[0]*res,storm[1]*res,res,res)

  }

}

function findLowestBelow(i,j,excludeSelf){

  minHtSoFar = terrain[i][j]

  minCellSoFar = [0][0]

  for (var deltaX in [-1,0,1]){

    for (var deltaY in [-1,0,1]){

      if (terrain[i+deltaX][j + deltaY] < minHtSoFar){

        minCellSoFar = [deltaX][deltaY]

      }

    }

  }

  return minCellSoFar

}

​

function findLowestAbove(i,j,excludeSelf){

}

function moveRain(){

}

function drawRain(){

}

function draw() {

  background(220);

  drawTerrain();

  drawStorms();

  drawRain();

}

​

function defineTerrain(x,y){

  //ht is height of point at (x,y)

  ht = random(360)

  return max(minHt,min(maxHt,ht));

}

​

function defineColor(ht){

  colHue = 255;

  colSat = 0;

  colBright = ht;

  col = color(colHue,colSat,colBright,1)

  return col;

}

​

​