straker/README.md

## README.md

      
    Raw
  

              README.md
            
          
    Basic Bomberman HTML and JavaScript Game

This is a basic implementation of the NES game Bomberman, but it's missing a few things intentionally and they're left as further exploration for the reader.

Further Exploration


Player death

The player should die when it is hit by an explosion from a bomb


Powerups

Add powerups that increase the bomb size and the number of bombs the player can place. The powerups should spawn randomly after a soft wall is blown up


2nd Player

Add a 2nd player to the game in the opposite corner and add additional controls so they can be played by someone else


Important note: I will answer questions about the code but will not add more features or answer questions about adding more features. This series is meant to give a basic outline of the game but nothing more.
License

(CC0 1.0 Universal) You're free to use this game and code in any project, personal or commercial. There's no need to ask permission before using these. Giving attribution is not required, but appreciated.
Other Basic Games


Snake
Pong
Breakout
Tetris
Frogger
Missile Command
Sokoban
Doodle Jump
Puzzle Bobble
Helicopter
Block Dude

Support

Basic HTML Games are made possible by users like you. When you become a Patron, you get access to behind the scenes development logs, the ability to vote on which games I work on next, and early access to the next Basic HTML Game.
Top Patrons


Karar Al-Remahy
UnbrandedTech
Innkeeper Games
Nezteb


## bomberman.html
<!DOCTYPE html>
<html>
<head>
  <title>Basic Bomberman HTML Game</title>
  <meta charset="UTF-8">
  <style>
  html, body {
    height: 100%;
    margin: 0;
  }

  body {
    background: black;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  canvas {
    background: forestgreen;
  }
  </style>
</head>
<body>
<canvas width="960" height="832" id="game"></canvas>
<script>
const canvas = document.getElementById('game');
const context = canvas.getContext('2d');
const grid = 64;
const numRows = 13;
const numCols = 15;

// create a new canvas and draw the soft wall image. then we can use this
// canvas to draw the images later on
const softWallCanvas = document.createElement('canvas');
const softWallCtx = softWallCanvas.getContext('2d');
softWallCanvas.width = softWallCanvas.height = grid;

softWallCtx.fillStyle = 'black';
softWallCtx.fillRect(0, 0, grid, grid);
softWallCtx.fillStyle = '#a9a9a9';

// 1st row brick
softWallCtx.fillRect(1, 1, grid - 2, 20);

// 2nd row bricks
softWallCtx.fillRect(0, 23, 20, 18);
softWallCtx.fillRect(22, 23, 42, 18);

// 3rd row bricks
softWallCtx.fillRect(0, 43, 42, 20);
softWallCtx.fillRect(44, 43, 20, 20);

// create a new canvas and draw the soft wall image. then we can use this
// canvas to draw the images later on
const wallCanvas = document.createElement('canvas');
const wallCtx = wallCanvas.getContext('2d');
wallCanvas.width = wallCanvas.height = grid;

wallCtx.fillStyle = 'black';
wallCtx.fillRect(0, 0, grid, grid);
wallCtx.fillStyle = 'white';
wallCtx.fillRect(0, 0, grid - 2, grid - 2);
wallCtx.fillStyle = '#a9a9a9';
wallCtx.fillRect(2, 2, grid - 4, grid - 4);

// create a mapping of object types
const types = {
  wall: '▉',
  softWall: 1,
  bomb: 2
};

// keep track of all entities
let entities = [];

// keep track of what is in every cell of the game using a 2d array. the
// template is used to note where walls are and where soft walls cannot spawn.
// '▉' represents a wall
// 'x' represents a cell that cannot have a soft wall (player start zone)
let cells = [];
const template = [
  ['▉','▉','▉','▉','▉','▉','▉','▉','▉','▉','▉','▉','▉','▉','▉'],
  ['▉','x','x',   ,   ,   ,   ,   ,   ,   ,   ,   ,'x','x','▉'],
  ['▉','x','▉',   ,'▉',   ,'▉',   ,'▉',   ,'▉',   ,'▉','x','▉'],
  ['▉','x',   ,   ,   ,   ,   ,   ,   ,   ,   ,   ,   ,'x','▉'],
  ['▉',   ,'▉',   ,'▉',   ,'▉',   ,'▉',   ,'▉',   ,'▉',   ,'▉'],
  ['▉',   ,   ,   ,   ,   ,   ,   ,   ,   ,   ,   ,   ,   ,'▉'],
  ['▉',   ,'▉',   ,'▉',   ,'▉',   ,'▉',   ,'▉',   ,'▉',   ,'▉'],
  ['▉',   ,   ,   ,   ,   ,   ,   ,   ,   ,   ,   ,   ,   ,'▉'],
  ['▉',   ,'▉',   ,'▉',   ,'▉',   ,'▉',   ,'▉',   ,'▉',   ,'▉'],
  ['▉','x',   ,   ,   ,   ,   ,   ,   ,   ,   ,   ,   ,'x','▉'],
  ['▉','x','▉',   ,'▉',   ,'▉',   ,'▉',   ,'▉',   ,'▉','x','▉'],
  ['▉','x','x',   ,   ,   ,   ,   ,   ,   ,   ,   ,'x','x','▉'],
  ['▉','▉','▉','▉','▉','▉','▉','▉','▉','▉','▉','▉','▉','▉','▉']
];

// populate the level with walls and soft walls
function generateLevel() {
  cells = [];

  for (let row = 0; row < numRows; row++) {
    cells[row] = [];

    for (let col = 0; col < numCols; col++) {

      // 90% chance cells will contain a soft wall
      if (!template[row][col] && Math.random() < 0.90) {
        cells[row][col] = types.softWall;
      }
      else if (template[row][col] === types.wall) {
        cells[row][col] = types.wall;
      }
    }
  }
}

// blow up a bomb and its surrounding tiles
function blowUpBomb(bomb) {

  // bomb has already exploded so don't blow up again
  if (!bomb.alive) return;

  bomb.alive = false;

  // remove bomb from grid
  cells[bomb.row][bomb.col] = null;

  // explode bomb outward by size
  const dirs = [{
    // up
    row: -1,
    col: 0
  }, {
    // down
    row: 1,
    col: 0
  }, {
    // left
    row: 0,
    col: -1
  }, {
    // right
    row: 0,
    col: 1
  }];
  dirs.forEach((dir) => {
    for (let i = 0; i < bomb.size; i++) {
      const row = bomb.row + dir.row * i;
      const col = bomb.col + dir.col * i;
      const cell = cells[row][col];

      // stop the explosion if it hit a wall
      if (cell === types.wall) {
        return;
      }

      // center of the explosion is the first iteration of the loop
      entities.push(new Explosion(row, col, dir, i === 0 ? true : false));
      cells[row][col] = null;

      // bomb hit another bomb so blow that one up too
      if (cell === types.bomb) {

        // find the bomb that was hit by comparing positions
        const nextBomb = entities.find((entity) => {
          return (
            entity.type === types.bomb &&
            entity.row === row && entity.col === col
          );
        });
        blowUpBomb(nextBomb);
      }

      // stop the explosion if hit anything
      if (cell) {
        return;
      }
    }
  });
}

// bomb constructor function
function Bomb(row, col, size, owner) {
  this.row = row;
  this.col = col;
  this.radius = grid * 0.4;
  this.size = size;    // the size of the explosion
  this.owner = owner;  // which player placed this bomb
  this.alive = true;
  this.type = types.bomb;

  // bomb blows up after 3 seconds
  this.timer = 3000;

  // update the bomb each frame
  this.update = function(dt) {
    this.timer -= dt;

    // blow up bomb if timer is done
    if (this.timer <= 0) {
      return blowUpBomb(this);
    }

    // change the size of the bomb every half second. we can determine the size
    // by dividing by 500 (half a second) and taking the ceiling of the result.
    // then we can check if the result is even or odd and change the size
    const interval = Math.ceil(this.timer / 500);
    if (interval % 2 === 0) {
      this.radius = grid * 0.4;
    }
    else {
      this.radius = grid * 0.5;
    }
  };

  // render the bomb each frame
  this.render = function() {
    const x = (this.col + 0.5) * grid;
    const y = (this.row + 0.5) * grid;

    // draw bomb
    context.fillStyle = 'black';
    context.beginPath();
    context.arc(x, y, this.radius, 0, 2 * Math.PI);
    context.fill();

    // draw bomb fuse moving up and down with the bomb size
    const fuseY = (this.radius === grid * 0.5 ? grid * 0.15 : 0);
    context.strokeStyle = 'white';
    context.lineWidth = 5;
    context.beginPath();
    context.arc(
      (this.col + 0.75) * grid,
      (this.row + 0.25) * grid - fuseY,
      10, Math.PI, -Math.PI / 2
    );
    context.stroke();
  };
}

// explosion constructor function
function Explosion(row, col, dir, center) {
  this.row = row;
  this.col = col;
  this.dir = dir;
  this.alive = true;

  // show explosion for 0.3 seconds
  this.timer = 300;

  // update the explosion each frame
  this.update = function(dt) {
    this.timer -= dt;

    if (this.timer <=0) {
      this.alive = false;
    }
  };

  // render the explosion each frame
  this.render = function() {
    const x = this.col * grid;
    const y = this.row * grid;
    const horizontal = this.dir.col;
    const vertical = this.dir.row;

    // create a fire effect by stacking red, orange, and yellow on top of
    // each other using progressively smaller rectangles
    context.fillStyle = '#D72B16';  // red
    context.fillRect(x, y, grid, grid);

    context.fillStyle = '#F39642';  // orange

    // determine how to draw based on if it's vertical or horizontal
    // center draws both ways
    if (center || horizontal) {
      context.fillRect(x, y + 6, grid, grid - 12);
    }
    if (center || vertical) {
      context.fillRect(x + 6, y, grid - 12, grid);
    }

    context.fillStyle = '#FFE5A8';  // yellow

    if (center || horizontal) {
      context.fillRect(x, y + 12, grid, grid - 24);
    }
    if (center || vertical) {
      context.fillRect(x + 12, y, grid - 24, grid);
    }
  };
}

// player character (just a simple circle)
const player = {
  row: 1,
  col: 1,
  numBombs: 1,
  bombSize: 3,
  radius: grid * 0.35,
  render() {
    const x = (this.col + 0.5) * grid;
    const y = (this.row + 0.5) * grid;

    context.save();
    context.fillStyle = 'white';
    context.beginPath();
    context.arc(x, y, this.radius, 0, 2 * Math.PI);
    context.fill();
  }
}

// game loop
let last;
let dt;
function loop(timestamp) {
  requestAnimationFrame(loop);
  context.clearRect(0,0,canvas.width,canvas.height);

  // calculate the time difference since the last update. requestAnimationFrame
  // passes the current timestamp as a parameter to the loop
  if (!last) {
    last = timestamp;
  }
  dt = timestamp - last;
  last = timestamp;

  // update and render everything in the grid
  for (let row = 0; row < numRows; row++) {
    for (let col = 0; col < numCols; col++) {
      switch(cells[row][col]) {
        case types.wall:
          context.drawImage(wallCanvas, col * grid, row * grid);
          break;
        case types.softWall:
          context.drawImage(softWallCanvas, col * grid, row * grid);
          break;
      }
    }
  }

  // update and render all entities
  entities.forEach((entity) => {
    entity.update(dt);
    entity.render();
  });

  // remove dead entities
  entities = entities.filter((entity) => entity.alive);

  player.render();
}

// listen to keyboard events to move the snake
document.addEventListener('keydown', function(e) {
  let row = player.row;
  let col = player.col;

  // left arrow key
  if (e.which === 37) {
    col--;
  }
  // up arrow key
  else if (e.which === 38) {
    row--;
  }
  // right arrow key
  else if (e.which === 39) {
    col++;
  }
  // down arrow key
  else if (e.which === 40) {
    row++;
  }
  // space key (bomb)
  else if (
    e.which === 32 && !cells[row][col] &&
    // count the number of bombs the player has placed
    entities.filter((entity) => {
      return entity.type === types.bomb && entity.owner === player
    }).length < player.numBombs
  ) {
    // place bomb
    const bomb = new Bomb(row, col, player.bombSize, player);
    entities.push(bomb);
    cells[row][col] = types.bomb;
  }

  // don't move the player if something is already at that position
  if (!cells[row][col]) {
    player.row = row;
    player.col = col;
  }
});

// start the game
generateLevel();
requestAnimationFrame(loop);
</script>
</body>
</html>
	<!DOCTYPE html>
	<html>
	<head>
	<title>Basic Bomberman HTML Game</title>
	<meta charset="UTF-8">
	<style>
	html, body {
	height: 100%;
	margin: 0;
	}

	body {
	background: black;
	display: flex;
	align-items: center;
	justify-content: center;
	}

	canvas {
	background: forestgreen;
	}
	</style>
	</head>
	<body>
	<canvas width="960" height="832" id="game"></canvas>
	<script>
	const canvas = document.getElementById('game');
	const context = canvas.getContext('2d');
	const grid = 64;
	const numRows = 13;
	const numCols = 15;

	// create a new canvas and draw the soft wall image. then we can use this
	// canvas to draw the images later on
	const softWallCanvas = document.createElement('canvas');
	const softWallCtx = softWallCanvas.getContext('2d');
	softWallCanvas.width = softWallCanvas.height = grid;

	softWallCtx.fillStyle = 'black';
	softWallCtx.fillRect(0, 0, grid, grid);
	softWallCtx.fillStyle = '#a9a9a9';

	// 1st row brick
	softWallCtx.fillRect(1, 1, grid - 2, 20);

	// 2nd row bricks
	softWallCtx.fillRect(0, 23, 20, 18);
	softWallCtx.fillRect(22, 23, 42, 18);

	// 3rd row bricks
	softWallCtx.fillRect(0, 43, 42, 20);
	softWallCtx.fillRect(44, 43, 20, 20);

	// create a new canvas and draw the soft wall image. then we can use this
	// canvas to draw the images later on
	const wallCanvas = document.createElement('canvas');
	const wallCtx = wallCanvas.getContext('2d');
	wallCanvas.width = wallCanvas.height = grid;

	wallCtx.fillStyle = 'black';
	wallCtx.fillRect(0, 0, grid, grid);
	wallCtx.fillStyle = 'white';
	wallCtx.fillRect(0, 0, grid - 2, grid - 2);
	wallCtx.fillStyle = '#a9a9a9';
	wallCtx.fillRect(2, 2, grid - 4, grid - 4);

	// create a mapping of object types
	const types = {
	wall: '▉',
	softWall: 1,
	bomb: 2
	};

	// keep track of all entities
	let entities = [];

	// keep track of what is in every cell of the game using a 2d array. the
	// template is used to note where walls are and where soft walls cannot spawn.
	// '▉' represents a wall
	// 'x' represents a cell that cannot have a soft wall (player start zone)
	let cells = [];
	const template = [
	['▉','▉','▉','▉','▉','▉','▉','▉','▉','▉','▉','▉','▉','▉','▉'],
	['▉','x','x', , , , , , , , , ,'x','x','▉'],
	['▉','x','▉', ,'▉', ,'▉', ,'▉', ,'▉', ,'▉','x','▉'],
	['▉','x', , , , , , , , , , , ,'x','▉'],
	['▉', ,'▉', ,'▉', ,'▉', ,'▉', ,'▉', ,'▉', ,'▉'],
	['▉', , , , , , , , , , , , , ,'▉'],
	['▉', ,'▉', ,'▉', ,'▉', ,'▉', ,'▉', ,'▉', ,'▉'],
	['▉', , , , , , , , , , , , , ,'▉'],
	['▉', ,'▉', ,'▉', ,'▉', ,'▉', ,'▉', ,'▉', ,'▉'],
	['▉','x', , , , , , , , , , , ,'x','▉'],
	['▉','x','▉', ,'▉', ,'▉', ,'▉', ,'▉', ,'▉','x','▉'],
	['▉','x','x', , , , , , , , , ,'x','x','▉'],
	['▉','▉','▉','▉','▉','▉','▉','▉','▉','▉','▉','▉','▉','▉','▉']
	];

	// populate the level with walls and soft walls
	function generateLevel() {
	cells = [];

	for (let row = 0; row < numRows; row++) {
	cells[row] = [];

	for (let col = 0; col < numCols; col++) {

	// 90% chance cells will contain a soft wall
	if (!template[row][col] && Math.random() < 0.90) {
	cells[row][col] = types.softWall;
	}
	else if (template[row][col] === types.wall) {
	cells[row][col] = types.wall;
	}
	}
	}
	}

	// blow up a bomb and its surrounding tiles
	function blowUpBomb(bomb) {

	// bomb has already exploded so don't blow up again
	if (!bomb.alive) return;

	bomb.alive = false;

	// remove bomb from grid
	cells[bomb.row][bomb.col] = null;

	// explode bomb outward by size
	const dirs = [{
	// up
	row: -1,
	col: 0
	}, {
	// down
	row: 1,
	col: 0
	}, {
	// left
	row: 0,
	col: -1
	}, {
	// right
	row: 0,
	col: 1
	}];
	dirs.forEach((dir) => {
	for (let i = 0; i < bomb.size; i++) {
	const row = bomb.row + dir.row * i;
	const col = bomb.col + dir.col * i;
	const cell = cells[row][col];

	// stop the explosion if it hit a wall
	if (cell === types.wall) {
	return;
	}

	// center of the explosion is the first iteration of the loop
	entities.push(new Explosion(row, col, dir, i === 0 ? true : false));
	cells[row][col] = null;

	// bomb hit another bomb so blow that one up too
	if (cell === types.bomb) {

	// find the bomb that was hit by comparing positions
	const nextBomb = entities.find((entity) => {
	return (
	entity.type === types.bomb &&
	entity.row === row && entity.col === col
	);
	});
	blowUpBomb(nextBomb);
	}

	// stop the explosion if hit anything
	if (cell) {
	return;
	}
	}
	});
	}

	// bomb constructor function
	function Bomb(row, col, size, owner) {
	this.row = row;
	this.col = col;
	this.radius = grid * 0.4;
	this.size = size; // the size of the explosion
	this.owner = owner; // which player placed this bomb
	this.alive = true;
	this.type = types.bomb;

	// bomb blows up after 3 seconds
	this.timer = 3000;

	// update the bomb each frame
	this.update = function(dt) {
	this.timer -= dt;

	// blow up bomb if timer is done
	if (this.timer <= 0) {
	return blowUpBomb(this);
	}

	// change the size of the bomb every half second. we can determine the size
	// by dividing by 500 (half a second) and taking the ceiling of the result.
	// then we can check if the result is even or odd and change the size
	const interval = Math.ceil(this.timer / 500);
	if (interval % 2 === 0) {
	this.radius = grid * 0.4;
	}
	else {
	this.radius = grid * 0.5;
	}
	};

	// render the bomb each frame
	this.render = function() {
	const x = (this.col + 0.5) * grid;
	const y = (this.row + 0.5) * grid;

	// draw bomb
	context.fillStyle = 'black';
	context.beginPath();
	context.arc(x, y, this.radius, 0, 2 * Math.PI);
	context.fill();

	// draw bomb fuse moving up and down with the bomb size
	const fuseY = (this.radius === grid * 0.5 ? grid * 0.15 : 0);
	context.strokeStyle = 'white';
	context.lineWidth = 5;
	context.beginPath();
	context.arc(
	(this.col + 0.75) * grid,
	(this.row + 0.25) * grid - fuseY,
	10, Math.PI, -Math.PI / 2
	);
	context.stroke();
	};
	}

	// explosion constructor function
	function Explosion(row, col, dir, center) {
	this.row = row;
	this.col = col;
	this.dir = dir;
	this.alive = true;

	// show explosion for 0.3 seconds
	this.timer = 300;

	// update the explosion each frame
	this.update = function(dt) {
	this.timer -= dt;

	if (this.timer <=0) {
	this.alive = false;
	}
	};

	// render the explosion each frame
	this.render = function() {
	const x = this.col * grid;
	const y = this.row * grid;
	const horizontal = this.dir.col;
	const vertical = this.dir.row;

	// create a fire effect by stacking red, orange, and yellow on top of
	// each other using progressively smaller rectangles
	context.fillStyle = '#D72B16'; // red
	context.fillRect(x, y, grid, grid);

	context.fillStyle = '#F39642'; // orange

	// determine how to draw based on if it's vertical or horizontal
	// center draws both ways
	if (center \|\| horizontal) {
	context.fillRect(x, y + 6, grid, grid - 12);
	}
	if (center \|\| vertical) {
	context.fillRect(x + 6, y, grid - 12, grid);
	}

	context.fillStyle = '#FFE5A8'; // yellow

	if (center \|\| horizontal) {
	context.fillRect(x, y + 12, grid, grid - 24);
	}
	if (center \|\| vertical) {
	context.fillRect(x + 12, y, grid - 24, grid);
	}
	};
	}

	// player character (just a simple circle)
	const player = {
	row: 1,
	col: 1,
	numBombs: 1,
	bombSize: 3,
	radius: grid * 0.35,
	render() {
	const x = (this.col + 0.5) * grid;
	const y = (this.row + 0.5) * grid;

	context.save();
	context.fillStyle = 'white';
	context.beginPath();
	context.arc(x, y, this.radius, 0, 2 * Math.PI);
	context.fill();
	}
	}

	// game loop
	let last;
	let dt;
	function loop(timestamp) {
	requestAnimationFrame(loop);
	context.clearRect(0,0,canvas.width,canvas.height);

	// calculate the time difference since the last update. requestAnimationFrame
	// passes the current timestamp as a parameter to the loop
	if (!last) {
	last = timestamp;
	}
	dt = timestamp - last;
	last = timestamp;

	// update and render everything in the grid
	for (let row = 0; row < numRows; row++) {
	for (let col = 0; col < numCols; col++) {
	switch(cells[row][col]) {
	case types.wall:
	context.drawImage(wallCanvas, col * grid, row * grid);
	break;
	case types.softWall:
	context.drawImage(softWallCanvas, col * grid, row * grid);
	break;
	}
	}
	}

	// update and render all entities
	entities.forEach((entity) => {
	entity.update(dt);
	entity.render();
	});

	// remove dead entities
	entities = entities.filter((entity) => entity.alive);

	player.render();
	}

	// listen to keyboard events to move the snake
	document.addEventListener('keydown', function(e) {
	let row = player.row;
	let col = player.col;

	// left arrow key
	if (e.which === 37) {
	col--;
	}
	// up arrow key
	else if (e.which === 38) {
	row--;
	}
	// right arrow key
	else if (e.which === 39) {
	col++;
	}
	// down arrow key
	else if (e.which === 40) {
	row++;
	}
	// space key (bomb)
	else if (
	e.which === 32 && !cells[row][col] &&
	// count the number of bombs the player has placed
	entities.filter((entity) => {
	return entity.type === types.bomb && entity.owner === player
	}).length < player.numBombs
	) {
	// place bomb
	const bomb = new Bomb(row, col, player.bombSize, player);
	entities.push(bomb);
	cells[row][col] = types.bomb;
	}

	// don't move the player if something is already at that position
	if (!cells[row][col]) {
	player.row = row;
	player.col = col;
	}
	});

	// start the game
	generateLevel();
	requestAnimationFrame(loop);
	</script>
	</body>
	</html>