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Basic Bomberman Game
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Basic Bomberman Game
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<!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>