我正在完成一项学校作业，你必须使用Javascript，HTML和CSS制作游戏，而不是Jquery。我正在做Pong，但我不能让我的球反弹。 这是弹跳位：
function ballBounce()
{
if(ball.y == -200)
{
ball.speedY = 1;
ball.speedX = 1;
ball.y += 1;
console.log("Bounce 1");
ball.y == -1;
}
else if(ball.y == 200)
{
ball.y - 1;
ball.speedY = -1;
ball.speedX = -1;
ball.y += -1;
console.log("Bounce 2");
ball.y == 1;
}
else if(ball.x == -200)
{
ball.y + 1;
ball.speedY = 1;
ball.speedX = 1;
ball.x += 1;
console.log("Bounce 3");
ball.x == -1;
}
else if(ball.x == 200)
{
ball.y - 1;
ball.speedY = -1;
ball.speedX = -1;
ball.y += -1;
console.log("Bounce 4");
ball.x == 1;
}
}
这就是我的所有代码：
var paddle1;
var paddle2;
var line;
var ball;
var W = 0;
var H = 0;
function startGame()
{
myGameArea.start();
paddle1 = new component(10, 50, "white", 10, 325);
paddle2 = new component(10, 50, "white", 980, 325);
line = new component(1, 700, "white", 500, 0);
ball = new component(12, 12, "white", 495, 325);
}
var myGameArea = {
canvas: document.createElement("canvas"),
start: function() {
this.canvas.width = 1000;
this.canvas.height = 690;
this.context = this.canvas.getContext("2d");
document.body.insertBefore(this.canvas, document.body.childNodes[0]);
this.interval = setInterval(updateGameArea, 20);
window.addEventListener('keydown', function(e) {
myGameArea.key = e.keyCode;
})
window.addEventListener('keyup', function(e) {
myGameArea.key = false;
})
},
clear: function() {
this.context.clearRect(0, 0, this.canvas.width, this.canvas.height);
}
}
function component(width, height, color, x, y, type)
{
this.type = type;
this.gamearea = myGameArea;
this.width = width;
this.height = height;
this.speedX = 0;
this.speedY = 0;
this.x = x;
this.y = y;
this.gravity = 0.1;
this.gravitySpeed = 0;
this.bounce = 0.6;
this.update = function() {
ctx = myGameArea.context;
ctx.fillStyle = color;
ctx.fillRect(this.x, this.y, this.width, this.height);
}
this.newPos = function() {
this.x += this.speedX;
this.y += this.speedY;
}
this.hitBottom = function() {
var rockbottom = myGameArea.canvas.height - this.height;
if (this.by > rockbottom) {
this.by = rockbottom;
this.gravitySpeed = -(this.gravitySpeed * this.bounce);
}
}
}
function updateGameArea()
{
myGameArea.clear();
paddle1.speedX = 0;
paddle1.speedY = 0;
ballBounce();
console.log(ball.y + " + " + ball.x);
ball.y += 5;
ball.x += 5;
ball.speedY = 1;
ball.speedX = -1;
if(myGameArea.key == 38)
{
paddle1.speedY = -5;
paddle2.y += 5;
H = H + 1;
score1 = document.getElementById("score").innerHTML = H;
if (H >= 68) {
paddle1.speedY = 0;
H = 68;
score1 = document.getElementById("score").innerHTML = H;
}
}
if(myGameArea.key == 40)
{
paddle1.speedY = 5;
paddle2.y -= 5;
H = H - 1;
score2 = document.getElementById("score").innerHTML = H;
if (H <= -68) {
paddle1.speedY = 0;
H = -68;
score2 = document.getElementById("score").innerHTML = H;
}
}
paddle1.newPos();
paddle1.update();
ball.newPos();
ball.update();
paddle2.newPos();
paddle2.update();
line.update();
function ballBounce()
{
if (ball.y == -200) {
ball.speedY = 1;
ball.speedX = 1;
ball.y += 1;
console.log("Bounce 1");
ball.y == -1;
} else if (ball.y == 200) {
ball.y - 1;
ball.speedY = -1;
ball.speedX = -1;
ball.y += -1;
console.log("Bounce 2");
ball.y == 1;
} else if (ball.x == -200) {
ball.y + 1;
ball.speedY = 1;
ball.speedX = 1;
ball.x += 1;
console.log("Bounce 3");
ball.x == -1;
} else if (ball.x == 200) {
ball.y - 1;
ball.speedY = -1;
ball.speedX = -1;
ball.y += -1;
console.log("Bounce 4");
ball.x == 1;
}
}
}
整件事：
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
<style>
body {
position: fixed;
padding: 0;
background-color: blue;
font-family: Pong;
}
@font-face {
font-family: Pong;
src: url(Pong.ttf);
}
canvas {
border: 1px solid grey;
background-color: black;
margin: auto;
padding-left: 0;
padding-right: 0;
margin-left: auto;
margin-right: auto;
display: block;
}
#score {
position: absolute;
left: 400px;
top: 0px;
font-size: 50px;
color: white;
}
#score2 {
position: absolute;
right: 400px;
top: 0px;
font-size: 50px;
color: white;
}
</style>
</head>
<body onload="startGame()">
<p id="score">0</p>
<p id="score2">0</p>
<script>
var paddle1;
var paddle2;
var line;
var ball;
var W = 0;
var H = 0;
function startGame() {
myGameArea.start();
paddle1 = new component(10, 50, "white", 10, 325);
paddle2 = new component(10, 50, "white", 980, 325);
line = new component(1, 700, "white", 500, 0);
ball = new component(12, 12, "white", 495, 325);
}
var myGameArea = {
canvas : document.createElement("canvas"),
start : function() {
this.canvas.width = 1000;
this.canvas.height = 690;
this.context = this.canvas.getContext("2d");
document.body.insertBefore(this.canvas, document.body.childNodes[0]);
this.interval = setInterval(updateGameArea, 20);
window.addEventListener('keydown', function (e) {
myGameArea.key = e.keyCode;
})
window.addEventListener('keyup', function (e) {
myGameArea.key = false;
})
},
clear : function(){
this.context.clearRect(0, 0, this.canvas.width, this.canvas.height);
}
}
function component(width, height, color, x, y, type) {
this.type = type;
this.gamearea = myGameArea;
this.width = width;
this.height = height;
this.speedX = 0;
this.speedY = 0;
this.x = x;
this.y = y;
this.gravity = 0.1;
this.gravitySpeed = 0;
this.bounce = 0.6;
this.update = function() {
ctx = myGameArea.context;
ctx.fillStyle = color;
ctx.fillRect(this.x, this.y, this.width, this.height);
}
this.newPos = function() {
this.x += this.speedX;
this.y += this.speedY;
}
this.hitBottom = function() {
var rockbottom = myGameArea.canvas.height - this.height;
if (this.by > rockbottom) {
this.by = rockbottom;
this.gravitySpeed = -(this.gravitySpeed * this.bounce);
}
}
}
function updateGameArea() {
myGameArea.clear();
//BallDir();
paddle1.speedX = 0;
paddle1.speedY = 0;
ballBounce();
//console.log(ball.y + " + " + ball.x);
ball.y += 5;
ball.x += 5;
ball.speedY = 1;
ball.speedX = -1;
//console.log("Ball.y: " + ball.y + " Ball.x: " + ball.x);
if (myGameArea.key == 38) {
paddle1.speedY = -5;
paddle2.y += 5;
H = H + 1;
score1 = document.getElementById("score").innerHTML = H;
if (H >= 68) {
paddle1.speedY = 0;
H = 68;
score1 = document.getElementById("score").innerHTML = H;
}
}
if (myGameArea.key == 40) {
paddle1.speedY = 5;
paddle2.y -= 5;
H = H - 1;
score2 = document.getElementById("score").innerHTML = H;
if (H <= -68) {
paddle1.speedY = 0;
H = -68;
score2 = document.getElementById("score").innerHTML = H;
}
}
//if (ball.H > 500) {
// ball.x -= 1;
//} else {
// ball.x += 1;
//}
paddle1.newPos();
paddle1.update();
ball.newPos();
ball.update();
paddle2.newPos();
paddle2.update();
line.update();
function ballBounce() {
if( ball.y < -200) {
ball.y += 1;
ball.speedY = 1;
console.log("Bounce 1");
}
if (ball.y > 200) {
ball.y -= 1;
ball.speedY = -1;
console.log("Bounce 2");
}
if( ball.x < -200) {
ball.x += 1;
ball.speedX = 1;
console.log("Bounce 3");
}
if (ball.x > 200) {
ball.x -= 1;
ball.speedX = -1;
console.log("Bounce 4");
}
}
}
/*if (ball.x == paddle2.x || ball.y == paddle2.y ) {
ball.speedX = 10;
ball.speedY = 10;
ball.x += 10;
ball.y += 10;
} */
/*function BallDir() {
var x = Math.floor((Math.random() * 4) + 1);
//console.log("Ball.y: " + ball.y)
// console.log("X: " + x)
if (x == 1) {
ball.y += 5;
ball.x += 5;
ball.speedY = 1;
ball.speedX = -1;
} else if (x == 2) {
ball.y -= 5;
ball.x -= 5;
ball.speedY = -1;
ball.speedX = 1;
} else if (x == 3) {
ball.y += 5;
ball.x -= 5;
ball.speedY = 1;
ball.speedX = 1;
} else {
ball.y -= 5;
ball.x += 5;
ball.speedY = -1;
ball.speedX = -1;
}
}*/
</script>
</body>
</html>
提前致谢