第一次寫俄羅斯方塊的時候已經是1年多前了，也是我剛剛學js不久。
爲了加強對js的理解又加上對遊戲的愛好，於是在沒有參考他人的思路和代碼下，自己用最基本的js代碼寫出了基於canvas的俄羅斯方塊。
在大三的暑假，我又用了es6的語法進行了改進，包含了class的語法糖、箭頭函數等，進一步增加自己對es6的理解，代碼有400+行
想要做這個小遊戲，必須先熟悉H5的canvas，js對數組的處理，鍵盤事件監聽和處理，定時器的使用等，其他的就是基本的邏輯處理了。
遊戲的規則就是核心，也是我們代碼的重中之重
這裏的邏輯核心是需要判斷方塊是否碰撞（當前運動的方塊和已經定位好的方塊有碰撞以致於當前的運動的方塊不能在向下走，因爲我們的方塊默認是向下走的，如果不能向下走，是視爲已經定位好的方塊，然後在生成一個新的方塊從初始位置繼續往下走）。
而且這個碰撞還需要應用在方塊變形的時候，同樣地，如果方塊在變形的過程中和其他定位好的方塊進行碰撞，則我們應該阻止這個方塊進行變形成功，
附上代碼，歡迎討論和指正
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>es6-重構俄羅斯方塊(基於canvas)</title>
<style type="text/css">
#tetris{ margin: 10px 250px;}
</style>
</head>
<body>
<canvas width="700" height="525" id="tetris"></canvas>
<div id="text" style='color: red;font-size: 30px;'>當前分數：0</div>
<script type="text/javascript">
/**
* [一個完整的俄羅斯方塊類 design by magic_xiang]
* @param {number} side [每個方塊邊長(px),默認35]
* @param {number} width [一行包含的方塊數(個),默認20]
* @param {number} height [一列包含的方塊數(個),默認15]
* @param {number} speed [方塊下落移動速度(ms),默認400]
*/
class tetris{
constructor(side=35, width=20, height=15, speed=400){
this.side = side // 每個方塊邊長
this.width = width // 一行包含的方塊數
this.height = height // 一列包含的方塊數
this.speed = speed // 方塊下落移動速度
this.num_blcok // 當前方塊類型的數字變量
this.type_color // 當前顏色類型的字符串變量
this.ident // setInterval的標識
this.direction = 1 // 方塊方向,初始化爲1，默認狀態
this.grade = 0 // 用來計算分數
this.over = false // 遊戲是否結束
this.arr_bX = [] // 存放當前方塊的X座標
this.arr_bY = [] // 存放當前方塊的Y座標
this.arr_store_X = [] // 存放到達底部所有方塊的X座標
this.arr_store_Y = [] // 存放到達底部所有方塊的Y座標
this.arr_store_color = [] // 存放到達底部所有方塊的顏色
this.paints = document.getElementById('tetris').getContext('2d')
//獲取畫筆
self = this
}
// 封裝paints方法，讓代碼更簡潔
paintfr(x, y, scale=1){
this.paints.fillRect(x*this.side, y*this.side, scale*this.side, scale*this.side)
}
// 遊戲開始
gameStart(){
this.init()
this.run()
}
// 初始化工作
init(){
this.initBackground()
this.initBlock()
}
// 方塊自動下落
run(){
this.ident = setInterval("self.down_speed_up()", this.speed)
}
// 初始化地圖
initBackground(){
this.paints.beginPath()
this.paints.fillStyle='#000000' //地圖填充顏色爲黑色
for(let i = 0; i < this.height; i++){
for(let j = 0; j < this.width; j++){
this.paintfr(j, i)
}
}
this.paints.closePath()
}
// 初始化方塊的位置和顏色
initBlock(){
this.paints.beginPath()
this.createRandom('rColor') //生成顏色字符串，
this.paints.fillStyle = this.type_color
this.createRandom('rBlock') //生成方塊類型數字
this.arr_bX.forEach((item, index) => {
this.paintfr(item, this.arr_bY[index], 0.9)
})
this.paints.closePath()
}
// 利用數組畫方塊
drawBlock(color){
this.paints.beginPath()
this.paints.fillStyle = color
this.arr_bX.forEach((item, index) => {
this.paintfr(item, this.arr_bY[index], 0.9)
})
this.paints.closePath()
}
// 畫已經在定位好的方塊
drawStaticBlock(){
this.arr_store_X.forEach((item, index) => {
this.paints.beginPath()
this.paints.fillStyle = this.arr_store_color[index]
this.paintfr(item, this.arr_store_Y[index], 0.9)
this.paints.closePath()
})
}
// 生成隨機數返回方塊類型或顏色類型
createRandom(type){
let temp = this.width/2-1
if (type == 'rBlock'){ //如果是方塊類型
this.num_blcok = Math.round(Math.random()*4+1)
switch(this.num_blcok){
case 1:
this.arr_bX.push(temp,temp-1,temp,temp+1)
this.arr_bY.push(0,1,1,1)
break
case 2:
this.arr_bX.push(temp,temp-1,temp-1,temp+1)
this.arr_bY.push(1,0,1,1)
break
case 3:
this.arr_bX.push(temp,temp-1,temp+1,temp+2)
this.arr_bY.push(0,0,0,0)
break
case 4:
this.arr_bX.push(temp,temp-1,temp,temp+1)
this.arr_bY.push(0,0,1,1)
break
case 5:
this.arr_bX.push(temp,temp+1,temp,temp+1)
this.arr_bY.push(0,0,1,1)
break
}
}
if (type == 'rColor'){ //如果是顏色類型
let num_color = Math.round(Math.random()*8+1)
switch(num_color){
case 1:
this.type_color='#3EF72A'
break
case 2:
this.type_color='yellow'
break
case 3:
this.type_color='#2FE0BF'
break
case 4:
this.type_color='red'
break
case 5:
this.type_color='gray'
break
case 6:
this.type_color='#C932C6'
break
case 7:
this.type_color= '#FC751B'
break
case 8:
this.type_color= '#6E6EDD'
break
case 9:
this.type_color= '#F4E9E1'
break
}
}
}
// 判斷方塊之間是否碰撞(下)，以及變形時是否越過下邊界
judgeCollision_down(){
for(let i = 0; i < this.arr_bX.length; i++){
if (this.arr_bY[i] + 1 == this.height){ //變形時是否越過下邊界
return false
}
if (this.arr_store_X.length != 0) { //判斷方塊之間是否碰撞(下)
for(let j = 0; j < this.arr_store_X.length; j++){
if (this.arr_bX[i] == this.arr_store_X[j]) {
if (this.arr_bY[i] + 1 == this.arr_store_Y[j]) {
return false
}
}
}
}
}
return true
}
//判斷方塊之間是否碰撞(左右)，以及變形時是否越過左右邊界
judgeCollision_other(num){
for(let i = 0; i < this.arr_bX.length; i++){
if (num == 1) { //變形時是否越過右邊界
if (this.arr_bX[i] == this.width - 1)
return false
}
if (num == -1) { //變形時是否越過左邊界
if (this.arr_bX[i] == 0)
return false
}
if (this.arr_store_X.length != 0) { //判斷方塊之間是否碰撞(左右)
for(let j = 0; j < this.arr_store_X.length; j++){
if (this.arr_bY[i] == this.arr_store_Y[j]) {
if (this.arr_bX[i] + num == this.arr_store_X[j]) {
return false
}
}
}
}
}
return true;
}
//方向鍵爲下的加速函數
down_speed_up(){
let flag_all_down = true
flag_all_down = this.judgeCollision_down()
if (flag_all_down) {
this.initBackground()
for(let i = 0; i < this.arr_bY.length; i++){
this.arr_bY[i] = this.arr_bY[i] + 1
}
}
else{
for(let i=0; i < this.arr_bX.length; i++){
this.arr_store_X.push(this.arr_bX[i])
this.arr_store_Y.push(this.arr_bY[i])
this.arr_store_color.push(this.type_color)
}
this.arr_bX.splice(0,this.arr_bX.length)
this.arr_bY.splice(0,this.arr_bY.length)
this.initBlock()
}
this.clearUnderBlock()
this.drawBlock(this.type_color)
this.drawStaticBlock()
this.gameover()
}
//方向鍵爲左右的左移動函數
move(dir_temp){
this.initBackground()
if (dir_temp == 1) { //右
let flag_all_right = true
flag_all_right = this.judgeCollision_other(1)
if (flag_all_right) {
for(let i = 0; i < this.arr_bY.length; i++){
this.arr_bX[i] = this.arr_bX[i]+1
}
}
}
else{
let flag_all_left = true
flag_all_left = this.judgeCollision_other(-1)
if (flag_all_left) {
for(let i=0; i < this.arr_bY.length; i++){
this.arr_bX[i] = this.arr_bX[i]-1
}
}
}
this.drawBlock(this.type_color)
this.drawStaticBlock()
}
//方向鍵爲空格的變換方向函數
up_change_direction(num_blcok){
if (num_blcok == 5) {
return
}
let arr_tempX = []
let arr_tempY = []
//因爲不知道是否能夠變形成功，所以先存儲起來
for(let i = 0;i < this.arr_bX.length; i++){
arr_tempX.push(this.arr_bX[i])
arr_tempY.push(this.arr_bY[i])
}
this.direction++
//將中心座標提取出來，變形都以當前中心爲準
let ax_temp = this.arr_bX[0]
let ay_temp = this.arr_bY[0]
this.arr_bX.splice(0, this.arr_bX.length) //將數組清空
this.arr_bY.splice(0, this.arr_bY.length)
if (num_blcok == 1) {
switch(this.direction%4){
case 1:
this.arr_bX.push(ax_temp,ax_temp-1,ax_temp,ax_temp+1)
this.arr_bY.push(ay_temp,ay_temp+1,ay_temp+1,ay_temp+1)
break
case 2:
this.arr_bX.push(ax_temp,ax_temp-1,ax_temp,ax_temp)
this.arr_bY.push(ay_temp,ay_temp,ay_temp-1,ay_temp+1)
break
case 3:
this.arr_bX.push(ax_temp,ax_temp-1,ax_temp,ax_temp+1)
this.arr_bY.push(ay_temp,ay_temp,ay_temp+1,ay_temp)
break
case 0:
this.arr_bX.push(ax_temp,ax_temp,ax_temp,ax_temp+1)
this.arr_bY.push(ay_temp,ay_temp-1,ay_temp+1,ay_temp)
break
}
}
if (num_blcok == 2) {
switch(this.direction%4){
case 1:
this.arr_bX.push(ax_temp,ax_temp-1,ax_temp-1,ax_temp+1)
this.arr_bY.push(ay_temp,ay_temp,ay_temp-1,ay_temp)
break
case 2:
this.arr_bX.push(ax_temp,ax_temp,ax_temp,ax_temp-1)
this.arr_bY.push(ay_temp,ay_temp-1,ay_temp+1,ay_temp+1)
break
case 3:
this.arr_bX.push(ax_temp,ax_temp-1,ax_temp+1,ax_temp+1)
this.arr_bY.push(ay_temp,ay_temp,ay_temp,ay_temp+1)
break
case 0:
this.arr_bX.push(ax_temp,ax_temp,ax_temp,ax_temp+1)
this.arr_bY.push(ay_temp,ay_temp-1,ay_temp+1,ay_temp-1)
break
}
}
if (num_blcok == 3) {
switch(this.direction%4){
case 1:
this.arr_bX.push(ax_temp,ax_temp-1,ax_temp+1,ax_temp+2)
this.arr_bY.push(ay_temp,ay_temp,ay_temp,ay_temp)
break
case 2:
this.arr_bX.push(ax_temp,ax_temp,ax_temp,ax_temp)
this.arr_bY.push(ay_temp,ay_temp-1,ay_temp+1,ay_temp+2)
break
case 3:
this.arr_bX.push(ax_temp,ax_temp-1,ax_temp+1,ax_temp+2)
this.arr_bY.push(ay_temp,ay_temp,ay_temp,ay_temp)
break
case 0:
this.arr_bX.push(ax_temp,ax_temp,ax_temp,ax_temp)
this.arr_bY.push(ay_temp,ay_temp-1,ay_temp+1,ay_temp+2)
break
}
}
if (num_blcok == 4) {
switch(this.direction%4){
case 1:
this.arr_bX.push(ax_temp,ax_temp-1,ax_temp,ax_temp+1)
this.arr_bY.push(ay_temp,ay_temp,ay_temp+1,ay_temp+1)
break
case 2:
this.arr_bX.push(ax_temp,ax_temp,ax_temp+1,ax_temp+1)
this.arr_bY.push(ay_temp,ay_temp+1,ay_temp,ay_temp-1)
break
case 3:
this.arr_bX.push(ax_temp,ax_temp,ax_temp-1,ax_temp+1)
this.arr_bY.push(ay_temp,ay_temp-1,ay_temp,ay_temp-1)
break
case 0:
this.arr_bX.push(ax_temp,ax_temp,ax_temp+1,ax_temp+1)
this.arr_bY.push(ay_temp,ay_temp-1,ay_temp,ay_temp+1)
break
}
}
if (! (this.judgeCollision_other(-1) && this.judgeCollision_down() && this.judgeCollision_other(1) )) { //如果變形不成功則執行下面代碼
this.arr_bX.splice(0, this.arr_bX.length)
this.arr_bY.splice(0, this.arr_bY.length)
for(let i=0; i< arr_tempX.length; i++){
this.arr_bX.push(arr_tempX[i])
this.arr_bY.push(arr_tempY[i])
}
}
this.drawStaticBlock()
}
//一行滿了清空方塊，上面方塊Y座標+1
clearUnderBlock(){
//刪除低層方塊
let arr_row=[]
let line_num
if (this.arr_store_X.length != 0) {
for(let j = this.height-1; j >= 0; j--){
for(let i = 0; i < this.arr_store_color.length; i++){
if (this.arr_store_Y[i] == j) {
arr_row.push(i)
}
}
if (arr_row.length == this.width) {
line_num = j
break
}else{
arr_row.splice(0, arr_row.length)
}
}
}
if (arr_row.length == this.width) {
//計算成績grade
this.grade++
document.getElementById('text').innerHTML = '當前成績：'+this.grade
for(let i = 0; i < arr_row.length; i++){
this.arr_store_X.splice(arr_row[i]-i, 1)
this.arr_store_Y.splice(arr_row[i]-i, 1)
this.arr_store_color.splice(arr_row[i]-i, 1)
}
//讓上面的方塊往下掉一格
for(let i = 0; i < this.arr_store_color.length; i++){
if (this.arr_store_Y[i] < line_num) {
this.arr_store_Y[i] = this.arr_store_Y[i]+1
}
}
}
}
//判斷遊戲結束
gameover(){
for(let i=0; i < this.arr_store_X.length; i++){
if (this.arr_store_Y[i] == 0) {
clearInterval(this.ident)
this.over = true
}
}
}
}
let tetrisObj = new tetris()
tetrisObj.gameStart()
//方向鍵功能函數
document.onkeydown = (e) => {
if (tetrisObj.over)
return
switch(e.keyCode){
case 40: // 方向爲下
tetrisObj.down_speed_up()
break
case 32: // 空格換方向
tetrisObj.initBackground() //重畫地圖
tetrisObj.up_change_direction(tetrisObj.num_blcok)
tetrisObj.drawBlock(tetrisObj.type_color)
break
case 37: // 方向爲左
tetrisObj.initBackground()
tetrisObj.move(-1)
tetrisObj.drawBlock(tetrisObj.type_color)
break
case 39: // 方向爲右
tetrisObj.initBackground()
tetrisObj.move(1)
tetrisObj.drawBlock(tetrisObj.type_color)
break
}
}
</script>
</body>
</html>