​

// https://github.com/CodingTrain/website/blob/master/CodingChallenges/CC_011_PerlinNoiseTerrain_p5.js/sketch.js

​

// Daniel Shiffman

// http://codingtra.in

// http://patreon.com/codingtrain

// Code for: https://youtu.be/IKB1hWWedMk

​

// Edited by SacrificeProductions

​

// mod kll & monkstone / oct 2018

​

var cols, rows;

var scl = 40;

var w = 1000;

var h = 600;

var x,y;

​

var flying = 0;

var ang =0,speed= 0.07;

​

var terrain = {};

var lake=0, lowlim=-45;

​

var showStroke = false;

​

var showPlane = false;

var Px =0;

var plane_up=100;

​

​

function setup() {

  createCanvas(700, 600, WEBGL);

  cols = w / scl;

  rows = h / scl;

  ang = PI/5;

​

  print("cols "+cols+" rows "+rows);

  print("use mouseWheel to change view angle");

  print("( click on canvas window first and ) use [UP] [DOWN] key for water level");

  print("and [s] for stroke and [p] for plane");

  print("[a]  [d] for plane left right, [w] [z] for plane up down");

​

}

​

function draw() {

  make_terrain();

​

  background(20, 20, 180);

  if ( showStroke) { stroke(200,200,0); } else { noStroke(); }

  translate(0, 50);

  rotateX(ang);

  translate(-w/2, -h/2);

  draw_terrain();

  if (showPlane) { draw_plane(); }

}

​

​

function   make_terrain() {

  flying -= speed;

  var yoff = flying;

  for ( y = 0; y < rows; y++) {

    var xoff = 0;

    for ( x = 0; x < cols; x++) {

      terrain[hash_key(x, y)] = constrain(map(noise(xoff, yoff), 0, 1, -100, 100),lowlim,100);

      xoff += 0.2;

    }

    yoff += 0.2;

  }

}

​

function draw_terrain() {

  for ( y = 0; y < rows-1; y++) {

    beginShape(TRIANGLE_STRIP);

    for ( x = 0; x < cols; x++) {

      var one = terrain[hash_key(x, y)];

      var two = terrain[hash_key(x,y + 1)];

      if (one <= lowlim ) { lake = 80; } else { lake = 0; }  // lakes

      fill(50,150-int(one),50+lake);                    // mountain color green to grey

      vertex(x*scl, y*scl, one);

      vertex(x*scl, (y+1)*scl, two);

    }

    endShape();

  }

​

​

}

​

​

function draw_plane(){

​

  fill(180,100,80);

  translate(w/2, h/2+100);

  rotateX(PI);

  translate(Px,0,-plane_up);

  cylinder(20, 100);

  translate(0,65);

  cone(20,30);  

  translate(0,-165);  

  cone(20,-100);

  translate(0,115);

  box(300,40,5);

  translate(0,-115);

  box(80,20,5);

  box(5,20,60);

}

function mouseWheel(event) {

  ang += event.delta/50.0;

  print("ang "+nf(degrees(ang),1,1));

  return false;

}

​

function keyPressed() {

 if ( keyCode === UP_ARROW )   { lowlim += 5; print("lowlim: "+lowlim); } 

 if ( keyCode === DOWN_ARROW ) { lowlim -= 5; print("lowlim: "+lowlim); } 

 if ( key === "s" ) { showStroke = !showStroke; print("showStroke: "+showStroke);}

 if ( key === "p" ) { showPlane  = !showPlane;  print("showPlane: "+showPlane);}

​

 if ( key === "a" ) { Px  -= 3;  print("fly left: "+Px);}

 if ( key === "d" ) { Px  += 3;  print("fly right: "+Px);}

 if ( key === "w" ) { plane_up   += 3;  print("fly up: "  +plane_up);}

 if ( key === "z" ) { plane_up   -= 3;  print("fly down: "+plane_up);}

​

​

} 

​

​

function hash_key(x, y){

  return w * y + x;

}

​