// Cloned by Nithin Sai K J on 21 Sep 2023 from World "One Cube World (P5)" by Starter user 
// Please leave this clone trail here.
 
 
const objectsize    = 200;      // size of object   

const anglechange   = 0.01;     // how much the rotate angle changes each step 

var angle = 0;                  // rotate angle starts at 0  

var img;

var cols, rows;
var scl = 20;
var w = ABWorld.fullwidth();
var h = 1600;

var flying = 0;
var terrain;

function preload() 
{
   img = loadImage ( '/uploads/nithinsai/world1.jpg' );
}


function setup()
{
  createCanvas ( ABWorld.fullwidth(), ABWorld.fullheight(),  WEBGL );
  cols = w / scl;
  rows = h / scl;
  terrain = create2DArray(cols, rows);
  rectMode(CENTER);
}

function draw()
{
    background(0); 
    noFill();
    stroke(255);
    texture(img); 
           
    // rotateX(angle);
    // rotateY(angle);
    // rotateZ(angle);
  
    box(objectsize);
  
    angle = angle + anglechange;
    
    // rotateX(0);
    // rotateY(0);
    // rotateZ(0);
    
    flying -= 0.1;
  
      var yoff = flying;
      for (let y = 0; y < rows; y++) {
        var xoff = 0;
        for (let x = 0; x < cols; x++) {
          terrain[x][y] = map(noise(xoff, yoff), 0, 1, -100, 100);
          xoff += 0.2;
        }
        yoff += 0.2;
      }
      
    translate(width / 2, height / 2);
    rotateX(PI / 3);
    translate(-width, -height / 2 + 50);
    for (let y = 0; y < rows - 1; y++) {
        beginShape(TRIANGLE_STRIP);
        for (let x = 0; x < cols; x++) {
            vertex(x * scl, y * scl, terrain[x][y]);
            vertex(x * scl, (y + 1) * scl, terrain[x][y + 1]);
            // rect(x * scl, y * scl, scl, scl);
        }
        endShape();
    }
}

function create2DArray(numArrays, numSubArrays) {
    var arr = new Array(numArrays);
    for (var i = 0; i < numArrays; i++) {
        arr[i] = new Array(numSubArrays);
    }
    return arr;
}