HTML5 Javascript游戏
[英]HTML5 Javascript game
问题描述
I'm trying to make a HTML5 game in javascript. 
我正在尝试用javascript制作HTML5游戏。 Similar to pong, but once the bubble hits the paddle or bottom screen it "bursts" or disappears. 类似于乒乓球，但一旦气泡击中桨或底部屏幕，它就会“爆裂”或消失。 I cant seem to get the Bubble to disappear or burst in my code. 我似乎无法让我的代码中的Bubble消失或破灭。 Could anyone help me? 谁能帮助我？
var canvasColor;
var x,y,radius,color;
var x=50, y=30
var bubbles=[];
var counter;
var lastBubble=0;
var steps=0, burst=0, escaped=0;
var batonMovement = 200;
var moveBatonRight = false;
var moveBatonLeft = false;
function startGame()
{
var r,g,b;
var canvas,color;
//Initialize
canvasColor = '#EAEDDC';
x = 10;
y = 10;
radius = 10;
clearScreen();
counter=0;
while (counter <100)
{
//make bubble appear randomly
x=Math.floor(Math.random()*450)
//Set up a random color
r = Math.floor(Math.random()*256);
g = Math.floor(Math.random()*256);
b = Math.floor(Math.random()*256);
color='rgb('+r+','+g+','+b+')';
bubbles[counter] = new Bubble(x,y,radius,color);
counter+=1;
}
setInterval('drawForever()',50);
}
function Bubble (x,y,radius,color)
{
this.x=x;
this.y=y;
this.radius=radius;
this.color=color;
this.active=false;
}
function drawForever()
{
var canvas, pen;
canvas = document.getElementById('myCanvas');
pen = canvas.getContext('2d');
steps +=1
clearScreen();
if (steps%20==0 && lastBubble < 100){
bubbles[lastBubble].active=true;
lastBubble +=1;
}
drawBaton();
counter=0;
while (counter <100)
{
if (bubbles[counter].active==true){
pen.fillStyle = bubbles[counter].color;
pen.beginPath();
pen.arc(bubbles[counter].x,
bubbles[counter].y,
bubbles[counter].radius,
0,
2*Math.PI);
pen.fill();
bubbles[counter].y+=2;
}
if (y>=240 && y<=270 && x>=batonMovement-10 && x<=batonMovement+60)
{
bubbles[lastBubble]=false;
}
else if (y>=450)
{
bubbles[lastBubble]=false;
}
counter +=1;
}
}
function clearScreen()
{
var canvas, pen;
canvas = document.getElementById('myCanvas');
pen = canvas.getContext('2d');
pen.fillStyle = canvasColor;
pen.fillRect(0,0,450,300);
}
function drawBaton()
{
var canvas, pen;
if (moveBatonLeft == true && batonMovement > 0)
{
batonMovement -= 20;
}
else if (moveBatonRight == true && batonMovement < 400)
{
batonMovement += 20;
}
//draw Baton (rectangle)
canvas = document.getElementById('myCanvas');
pen = canvas.getContext('2d');
pen.fillStyle = '#0000FF';
pen.fillRect(batonMovement,250,50,10);
}
function moveLeft()
{
moveBatonLeft=true;
}
function moveRight()
{
moveBatonRight=true;
}
function stopMove()
{
moveBatonLeft=false;
moveBatonRight=false;
}
Below is the HTML code... 以下是HTML代码......
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Bubble Burster</title>
<script type="text/javascript" src="project.js"></script>
</head>
<body onload="startGame();">
<div style="text-align:center;">
<h2>Bubble Burster</h2>
<canvas id="myCanvas" width="450" height="300" style="border:5px solid #000000; background-color: #f1f1f1;">
Your browser does not support the canvas element.
</canvas><br>
<button onmousedown="moveLeft();" onmouseup="stopMove();">LEFT</button>
<button onmousedown="moveRight();" onmouseup="stopMove();">RIGHT</button><br><br>
<form>
<input type="radio" name="difficulty" value="easy" onclick="check(this.value);" checked> Easy
<input type="radio" name="difficulty" value="moderate" onclick="check(this.value)"> Moderate
<input type="radio" name="difficulty" value="hard" onclick="check(this.value)"> Hard <br><br>
</form>
<span id="burst">Burst:</span>
<span id="escaped">Escaped: </span>
<span id="steps">Steps elapsed:</span>
<h3 id="output"></h3>
</div>
</body>
</html>
1 个解决方案
解决方案1
0 2017-05-09 23:26:31
You are referring to x , y which are not defined in the drawForever function. 您指的是未在drawForever函数中定义的x ， y 。 The global values of x and y may not refer to the right bubble. x和y的全局值可能不是指正确的泡沫。 In fact y is set to 10 in the startGame function and never altered subsequently. 实际上，在startGame函数中y被设置为10，并且随后不会改变。 You also probably want to refer to bubbles[counter] rather than bubbles[lastBubble] . 你也可能想要引用bubbles[counter]而不是bubbles[lastBubble] 。 The game seems to work if you make the changes below, referring to bubbles[counter].x and bubbles[counter].y instead of x and y . 如果您在下面进行更改，游戏似乎有效，指的是bubbles[counter].x和bubbles[counter].y而不是x和y 。
function drawForever() {
var canvas, pen;
canvas = document.getElementById('myCanvas');
pen = canvas.getContext('2d');
steps += 1
clearScreen();
if (steps % 20 == 0 && lastBubble < 100) {
bubbles[lastBubble].active = true;
lastBubble += 1;
}
drawBaton();
counter = 0;
while (counter < 100) {
if (bubbles[counter].active == true) {
pen.fillStyle = bubbles[counter].color;
pen.beginPath();
pen.arc(bubbles[counter].x,
bubbles[counter].y,
bubbles[counter].radius,
0,
2 * Math.PI);
pen.fill();
bubbles[counter].y += 2;
}
y = bubbles[counter].y; // ADDED (y was not defined in original code)
x = bubbles[counter].x; // ADDED (x was not defined in original code)
if (y >= 240 && y <= 270 && x >= batonMovement - 10 && x <= batonMovement + 60) {
bubbles[counter] = false; // ALTERED (burst the current bubble, not whatever lastBubble refers to
} else if (y >= 450) {
bubbles[counter] = false; // ALTERED (burst the current bubble, not whatever lastBubble refers to
}
counter += 1;
}
}
https://jsfiddle.net/acLot87q/4/ https://jsfiddle.net/acLot87q/4/
You should also make x and y local variables within each function; 您还应该在每个函数中创建x和y局部变量; they are not currently serving the purpose that you seem to think. 他们目前没有达到你想象中的目的。
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