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dinoGame.js
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dinoGame.js
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const canvas=document.getElementById('canvas');
const ctx=canvas.getContext('2d');
const imageNames=['bird','cactus','dino'];
//グローバルなgameオブジェクト
const game={
counter: 0,
backGrounds:[],
bgm1:new Audio('bgm/fieldSong.mp3'),
bgm2:new Audio('bgm/jump.mp3'),
enemys: [],
enemyCountdown:0,
image:{},
state:'loading',
score: 0,
timer: null
};
game.bgm1.loop=true;
//複数画像読み込み
let imageLoadCounter=0;
for(const imageName of imageNames){
const imagePath=`image/${imageName}.png`;
game.image[imageName]=new Image();
game.image[imageName].src=imagePath;
game.image[imageName].onload=()=>{
imageLoadCounter+=1;
if(imageLoadCounter===imageNames.length){
console.log('画像のロードが完了しました。');
init();
}
}
}
function init(){
game.counter=0;
game.enemys=[];
game.enemyCountdown=0;
game.score=0;
game.state='init';
//画面クリア
ctx.clearRect(0,0,canvas.width,canvas.height);
createDino();
drawDino();
//背景の描画
createBackGround();
drawBackGrounds();
//文章の表示
ctx.fillStyle='black';
ctx.font='bold 60px serif';
ctx.fillText(`Press Space key`,60,150);
ctx.fillText(`to start.`,150,230);
}
function start(){
game.state='gaming';
game.bgm1.play();
game.timer=setInterval(ticker,30);
}
function ticker(){
//画面クリア
ctx.clearRect(0,0,canvas.width,canvas.height);
//背景の作成
if(game.counter%10===0){
createBackGround();
}
//敵キャラクタの生成
createEnemys();
//キャラクタの移動
moveBackGrounds();
moveDino();
moveEnemys();
//描画
drawBackGrounds();
drawDino();
drawEnemys();
drawScore();
//あたり判定
hitCheck();
//カウンタの更新
game.score+=1;
game.counter=(game.counter+1)%1000000;
game.enemyCountdown-=1;
}
function createDino(){
game.dino={
x:game.image.dino.width/2,
y:canvas.height-game.image.dino.height/2,
moveY:0,
width:game.image.dino.width,
height:game.image.dino.height,
image:game.image.dino
}
}
function createBackGround(){
game.backGrounds=[];
for(let x=0;x<=canvas.width;x+=200){
game.backGrounds.push({
x:x,
y:canvas.height,
width:200,
moveX:-20
});
}
}
function createCactus(createX){
game.enemys.push({
x:createX,
y:canvas.height-game.image.cactus.height/2,
width:game.image.cactus.width,
height:game.image.cactus.height,
moveX:-10,
image:game.image.cactus
});
}
function createBird(){
const birdY=Math.random()*(300-game.image.bird.height)+150;
game.enemys.push({
x:canvas.width+game.image.bird.width/2,
y:birdY,
width:game.image.bird.width,
height:game.image.bird.height,
moveX:-15,
image:game.image.bird
});
}
function createEnemys(){
if(game.enemyCountdown===0){
game.enemyCountdown=60-Math.floor(game.score/100);
if(game.enemyCountdown<=30)game.enemyCountdown=30;
switch(Math.floor(Math.random()*3)){
case 0:
createCactus(canvas.width+game.image.cactus.width/2);
break;
case 1:
createCactus(canvas.width+game.image.cactus.width/2);
createCactus(canvas.width+game.image.cactus.width*3/2);
break;
case 2:
createBird();
break;
}
}
}
function moveBackGrounds(){
for (const backGround of game.backGrounds){
backGround.x+=backGround.moveX;
}
}
function moveDino(){
game.dino.y+=game.dino.moveY;
if(game.dino.y>=canvas.height-game.dino.height/2){
game.dino.y=canvas.height-game.dino.height/2;
game.dino.moveY=0;
} else{
game.dino.moveY+=3;
}
}
function moveEnemys(){
for(const enemy of game.enemys){
enemy.x+=enemy.moveX;
}
//画面の外にでたキャラクタを配列から排除
game.enemys=game.enemys.filter(enemy => enemy.x >-enemy.width);
}
function drawEnemys(){
for(const enemy of game.enemys){
ctx.drawImage(enemy.image,enemy.x-enemy.width/2,enemy.y-enemy.height/2);
}
}
function drawBackGrounds(){
ctx.fillStyle='sienna';
for(const backGround of game.backGrounds){
ctx.fillRect(backGround.x,backGround.y-5,backGround.width,5);
ctx.fillRect(backGround.x+20,backGround.y-10,backGround.width-40,5);
ctx.fillRect(backGround.x+50,backGround.y-15,backGround.width-100,5);
}
}
function drawDino(){
ctx.drawImage(game.image.dino,game.dino.x-game.dino.width/2,game.dino.y-game.dino.height/2);
}
function drawScore()
{
ctx.fillStyle='black';
ctx.font='24px serif';
ctx.fillText(`score: ${game.score}`,0,30)
}
function hitCheck(){
for(const enemy of game.enemys){
if(
Math.abs(game.dino.x-enemy.x)<game.dino.width*0.8/2+enemy.width*0.9/2 &&
Math.abs(game.dino.y-enemy.y)<game.dino.height*0.5/2+enemy.height*0.9/2
){
game.state='gameover';
game.bgm1.pause();
ctx.fillStyle='black';
ctx.font='bold 100px serif';
ctx.fillText(`Game Over!`, 150,200);
clearInterval(game.timer);
}
}
}
document.onkeydown = (e) =>{
if(e.code==='Space' && game.state==='init'){
start();
}
if(e.code==='Space' && game.dino.moveY===0){
game.dino.moveY=-41;
game.bgm2.play();
}
if(e.code==='Enter' && game.state==='gameover'){
init();
}
};