//

//W and H are the width and height of Atari screen 

//(i.e. H is # of scanlines...)

//

// PIXW and PIXH are how many pixels are used in canvas here

// to make it look roughly like the atari screen

//

​

​

const W = 32;

const H = 11;

​

​

const PIXW = 24;

const PIXH = 48;

​

​

const grid = Array();

​

let isDrawing = false;

let sx,sy,ex,ey;

function setup() {

  for (let x = 0; x < W; x++) {

    grid[x] = Array();

  }

​

  createCanvas(W * PIXW, H * PIXH);

}

​

function draw() {

  background(40);

  noStroke();

  fill(255);

  for (let x = 0; x < W; x++) {

    for (let y = 0; y < H; y++) {

      if (grid[x][y]) rect(x * PIXW, y * PIXH, PIXW, PIXH);

    }

​

  }

  stroke(random(255));

  strokeWeight(1);

  let x = int(mouseX/PIXW); 

  let y = int(mouseY/PIXH);

  noFill();

  rect(x * PIXW, y * PIXH, PIXW, PIXH);

  stroke(255,0,0);

}

​

​

​

function mousePressed() {

  x = int(mouseX / PIXW);

  y = int(mouseY / PIXH);

  isDrawing = !grid[x][y];

​

  grid[x][y] = isDrawing;

  // loop();

}

​

function mouseDragged() {

  // loop();

  sx = pmouseX;

  sy = pmouseY;

  ex = mouseX;

  ey = mouseY;

  //catch all the spots in the line between the drag endpints

  for(let i = 0; i < 100; i++){

      const tx = map(i,1,100,sx,ex); 

      const ty = map(i,1,100,sy,ey); 

      const x = int(tx / PIXW);

      const y = int(ty / PIXH);

      if(x >= 0 && x < W && y >= 0 && y < H) {

        grid[x][y] = isDrawing;

      }

​

  }

}

​

function keyPressed() {

  let buf = `    set kernel_options no_blank_lines

startLoop

​

    COLUPF = $0E

​

      playfield:\n`;

  for (let y = 0; y < H; y++) {

    buf += '   ';

    for (let x = 0; x < W; x++) {

      buf += grid[x][y] ? 'X':'.';

    }

    buf += '\n';

  }

  buf += `end 

​

 drawscreen

 goto startLoop`;

  print(buf);

​

}