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index.html
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<!DOCTYPE html>
<html>
<head>
<title>JS13K</title>
</head>
<meta name="viewport" content="user-scalable=0"/>
<body style="background-color: #000">
<div style="width: 600px; margin: 0 auto; padding-top: 20px;">
<canvas id="canvas" width="600" height="200"></canvas>
<p style="color: #fff">HOW TO PLAY: Press "A" or "D" to punch.</p>
<p style="color: #fff">When you see the word 'Reverse' the punch buttons reverse.</p>
</div>
<script>
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
var width = canvas.width;
var height = canvas.height;
var enemies = [];
// Screen Shake
var shakeTimeInterval = 100;
var screenShakeDistance = "5px";
// Spawn enemies and reverse game
var reverseGame = false;
var countToReverse = 0;
var nextWaveReady = true;
var spawnWaveInterval = 1000;
var reverseFlipTime = 1000;
var killsToFlip = 10;
var ground = {
width: canvas.width,
height: 100,
pos: {
x: 0,
y: 100
},
draw: function(){
ctx.fillStyle = returnFillColor();
ctx.fillRect(this.pos.x, this.pos.y, this.width, this.height);
}
};
var player = {
width: 25,
height: 25,
pos: {
x: 288,
y: 75
},
score: 0,
draw: function() {
ctx.font = "24px serif";
ctx.fillStyle = "#000";
ctx.fillText("Score: " + this.score, 260, 25);
if ( !this.isDead ) {
ctx.fillStyle = returnFillColor();
ctx.fillRect(this.pos.x, this.pos.y, this.width, this.height);
if ( this.punchLeft && !this.hasPunched ) {
ctx.fillRect( this.pos.x - 30, this.pos.y + 10, 30, 10);
setTimeout( function() {
cancelPunchLeft();
}, 100);
}
else if ( this.punchRight && !this.hasPunched ) {
ctx.fillRect( this.pos.x + 25, this.pos.y + 8, 30, 10);
setTimeout( function() {
cancelPunchRight();
}, 100);
}
if ( reverseGame ) {
ctx.font = "48px serif";
ctx.fillStyle = '#000';
ctx.fillText("REVERSE!", 185, 150);
}
} else {
ctx.font = "48px serif";
ctx.fillStyle = '#fff';
ctx.fillText("GAME OVER", 160, 145);
ctx.font = "22px serif";
ctx.fillText("Press 'space' to play again", 185, 170);
ctx.fillText("Or click here", 245, 195);
}
},
punchRight: false,
punchLeft: false,
hasPunched: false,
isDead: false
};
function createEnemy() {
var enemy = {
width: 20,
height: 40,
pos: {
x: 0,
y: 60
},
speed: 2,
draw: function(){
if ( !this.isDead ) {
ctx.fillStyle = returnFillColor();
ctx.fillRect(this.pos.x, this.pos.y, this.width, this.height);
if ( !player.isDead && !this.headingRight ) {
this.pos.x += this.speed;
} else if ( !player.isDead && this.headingRight ) {
this.pos.x -= this.speed;
}
} else if ( this.isDead && !this.playedDeathAnim ) {
var particleCount = 0;
for ( var i = 0; i < this.deathAnim.length; i++ ) {
if ( !this.deathAnim[ i ].isDead ) {
this.deathAnim[ i ].draw();
} else if ( this.deathAnim[ i ].isDead ) {
particleCount++;
}
}
if ( particleCount === this.deathAnim.length ) {
this.playedDeathAnim = true;
}
}
},
isDead: true,
headingRight: false,
playedDeathAnim: true,
deathAnim: []
};
return enemy;
}
for ( var i = 0; i < 6; i++ ) {
var temp = createEnemy();
if ( i%2 === 0 ) {
temp.headingRight = true;
temp.pos.x = 600;
}
enemies.push( temp );
}
function setupBlocks( coords, isFlipped ) {
var blocks = [];
var posX = coords.x + 20; // enemy width
var posY = coords.y + 50; // enemy height / 2
for ( var i = 0; i < 6; i++ ) {
var tempY = posY - ( i * 15 );
var temp = {
width: 10,
height: 10,
pos: {
x: posX,
y: tempY
},
draw: function(){
if ( !this.isDead ) {
ctx.fillStyle = returnFillColor();
ctx.fillRect(this.pos.x, this.pos.y, this.width, this.height);
if ( !player.isDead ) {
if ( this.flip ) {
this.pos.x += getRandomInt(5, 10);
} else {
this.pos.x -= getRandomInt(5, 10);
}
if ( this.id < 2 ) {
this.pos.y += 0.5;
}else{
this.pos.y -= 0.5;
}
if ( this.TTL < 0 ) {
this.isDead = true;
}
this.width -= 0.25;
this.height -= 0.25;
this.TTL--;
}
}
},
id: i,
isDead: false,
TTL: 50,
flip: isFlipped
}
blocks.push(temp);
}
return blocks;
};
var leftButton = {
width: 100,
height: 100,
pos: {
x: 50,
y: 100
},
draw: function() {
if ( this.isPressed ) {
ctx.fillStyle = returnFillColor();
ctx.fillRect(this.pos.x + 20, this.pos.y + 20, this.width - 40, this.height - 40);
}else{
ctx.fillStyle = '#686868';
ctx.fillRect(this.pos.x, this.pos.y, this.width, this.height);
ctx.font = "48px serif";
ctx.fillStyle = '#fff';
if ( reverseGame ) {
ctx.fillText("D", this.pos.x + 35, this.pos.y + 65);
}else{
ctx.fillText("A", this.pos.x + 35, this.pos.y + 65);
}
}
},
isPressed: false
};
var rightButton = {
width: 100,
height: 100,
pos: {
x: 450,
y: 100
},
draw: function() {
if ( this.isPressed ) {
ctx.fillStyle = returnFillColor();
ctx.fillRect(this.pos.x + 20, this.pos.y + 20, this.width - 40, this.height - 40);
}else{
ctx.fillStyle = '#686868';
ctx.fillRect(this.pos.x, this.pos.y, this.width, this.height);
ctx.font = "48px serif";
ctx.fillStyle = '#fff';
if ( reverseGame ) {
ctx.fillText("A", this.pos.x + 35, this.pos.y + 65);
}else{
ctx.fillText("D", this.pos.x + 35, this.pos.y + 65);
}
}
},
isPressed: false
};
//ctx.fillRect(160, 100, 280, 100);
var restartButton = {
width: 280,
height: 100,
pos: {
x: 160,
y: 100
}
};
function checkAgainstEnemies() {
for ( var i = 0; i < enemies.length; i++ ) {
if ( ( enemies[ i ].pos.x + enemies[ i ].width ) > player.pos.x &&
!enemies[ i ].headingRight ) {
player.isDead = true;
}
if ( enemies[ i ].pos.x < ( player.pos.x + player.width ) &&
enemies[ i ].headingRight ) {
player.isDead = true;
}
if ( player.punchLeft && enemies[ i ].pos.x > (player.pos.x - 60) &&
enemies[ i ].pos.x < (player.pos.x + player.width) &&
!enemies[ i ].isDead && !player.isDead ) {
player.score++;
screenShake();
enemies[ i ].isDead = true;
countToReverse++;
enemies[ i ].deathAnim = setupBlocks( enemies[ i ].pos, enemies[ i ].headingRight );
}
if ( player.punchRight && enemies[ i ].pos.x < (player.pos.x + 60) &&
enemies[ i ].pos.x > (player.pos.x + player.width) &&
!enemies[ i ].isDead && !player.isDead ) {
player.score++;
screenShake();
enemies[ i ].isDead = true;
countToReverse++;
enemies[ i ].deathAnim = setupBlocks( enemies[ i ].pos, enemies[ i ].headingRight );
}
}
}
function drawEnemies() {
for ( var i = 0; i < enemies.length; i++ ) {
enemies[ i ].draw();
}
}
function spawnEnemies() {
if ( !nextWaveReady && !player.isDead ) return;
for ( var i = 0; i < enemies.length; i++ ) {
if ( enemies[ i ].isDead && enemies[ i ].playedDeathAnim ) {
enemies[ i ].pos.x = 0;
if ( enemies[ i ].headingRight ) {
enemies[ i ].pos.x = 600;
}
enemies[ i ].isDead = false;
enemies[ i ].playedDeathAnim = false;
enemies[ i ].speed = getRandomInt(1, 3);
break;
}
}
nextWaveReady = false;
setTimeout( function() {
nextWaveReady = true;
}, spawnWaveInterval);
if ( countToReverse > killsToFlip && !reverseGame ) {
reverseGame = true;
setTimeout( function() {
reverseGame = false;
countToReverse = 0;
killsToFlip = getRandomInt(4, 10);
reverseFlipTime = getRandomInt(1000, 3000);
spawnWaveInterval = getRandomInt(1000, 3000);
}, reverseFlipTime );
}
}
function update() {
checkAgainstEnemies();
spawnEnemies();
}
function render() {
ground.draw();
player.draw();
leftButton.draw();
rightButton.draw();
drawEnemies();
}
function restartGame() {
player.isDead = false;
player.score = 0;
for ( var i = 0; i < enemies.length; i++ ) {
enemies[ i ].pos.x = 0;
if ( enemies[ i ].headingRight ) {
enemies[ i ].pos.x = width;
}
enemies[ i ].isDead = true;
enemies[ i ].playedDeathAnim = true;
}
}
function animate() {
if ( reverseGame ) {
ctx.fillStyle = '#000';
}else{
ctx.fillStyle = '#fff';
}
ctx.fillRect(0, 0, width, height);
window.requestAnimationFrame( animate );
update();
render();
}
function setPunchLeft() {
player.punchLeft = true;
leftButton.isPressed = true;
}
function setPunchRight() {
player.punchRight = true;
player.hasPunched = false;
rightButton.isPressed = true;
}
function cancelPunchLeft() {
player.punchLeft = false;
player.hasPunched = false;
leftButton.isPressed = false;
}
function cancelPunchRight() {
player.punchRight = false;
rightButton.isPressed = false;
}
function getRandomInt(min, max) {
return Math.floor(Math.random() * (max - min)) + min;
}
window.requestAnimationFrame( animate );
window.addEventListener('keydown', function(e) {
if ( e.keyCode === 65 ) { // 65 - Left
if ( reverseGame ) {
setPunchRight();
}else{
setPunchLeft();
}
}else if ( e.keyCode === 68 ) { // 68 - Right
if ( reverseGame ) {
setPunchLeft();
}else{
setPunchRight();
}
}
});
window.addEventListener('keyup', function(e) {
if ( e.keyCode === 65 ) {
if ( reverseGame ) {
cancelPunchRight();
}else{
cancelPunchLeft();
}
}else if ( e.keyCode === 68 ) {
if ( reverseGame ) {
cancelPunchLeft();
}else{
cancelPunchRight();
}
}
if ( e.keyCode === 32 && player.isDead ) {
restartGame();
}
});
window.addEventListener('mouseup', function(e) {
cancelPunchLeft();
cancelPunchRight();
});
function checkBtnCollision ( mouseCoords, rect2 ) {
if ( mouseCoords.x > rect2.pos.x &&
mouseCoords.x < ( rect2.pos.x + rect2.width ) &&
mouseCoords.y > rect2.pos.y &&
mouseCoords.y < ( rect2.pos.y + rect2.height ) ) {
return true;
}
return false;
}
window.addEventListener('mousedown', function(e) {
processEvent( e );
});
window.addEventListener('touchstart', function(e) {
for ( var i = 0; i < e.touches.length; i++ ) {
checkUITouch( e.touches[ i ] );
}
});
function checkUITouch( e ) {
processEvent( e );
}
function processEvent( e ) {
var X = e.clientX - canvas.offsetLeft;
var Y = e.clientY - canvas.offsetTop;
var temp = {
x: X,
y: Y
}
if ( checkBtnCollision( temp, leftButton) ) {
if ( reverseGame ) {
setPunchRight();
}else{
setPunchLeft();
}
}
if ( checkBtnCollision( temp, rightButton) ) {
if ( reverseGame ) {
setPunchLeft();
}else{
setPunchRight();
}
}
if ( player.isDead ) {
if ( checkBtnCollision( temp, restartButton ) ) {
restartGame();
}
}
}
window.addEventListener('touchend', function(e) {
cancelPunchLeft();
cancelPunchRight();
});
function screenShake() {
canvas.style.marginLeft = screenShakeDistance;
setTimeout( function() {
canvas.style.marginLeft = "0";
setTimeout( function() {
canvas.style.marginRight = screenShakeDistance;
setTimeout( function() {
canvas.style.marginRight = "0";
}, shakeTimeInterval);
}, shakeTimeInterval);
}, shakeTimeInterval);
}
function returnFillColor () {
if ( reverseGame ) {
return '#fff';
}
return '#000';
}
</script>
</body>
</html>