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Когда я пытаюсь изменить табло с помощью переменной computerCount (как вы можете видеть в инструкции if в функции обновления для шаровой переменной), другие номера отображаются неправильно. Имейте в виду, что сначала 0 работает правильно.Как обновить текст, записанный на холсте
JSFiddle format - Вы можете изменить код, перейдя в правом верхнем углу, который говорит "Edit" в JSFiddle.
Код:
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Pong</title>
<!-- Basic styling, centering the canvas -->
<style>
canvas{
position: absolute;
margin: auto;
top:60px;
bottom:0;
right:0;
left:0;
}
#scoreBoard{
position: absolute;
margin: auto;
top:0;
bottom:640px;
right:720px;
left:20px;
}
</style>
</head>
<body>
<canvas id = "scoreBoard" width="500" height = "100"></canvas>
<script>
var WIDTH = 700
var HEIGHT = 600
var pi = Math.PI
var canvas
var ctx
var keystate
var upArrow = 38;
var downArrow = 40;
var computerCount = 0;
var playerCount = 0;
var player = {
x: null,
y: null,
width: 20,
height: 100,
/**
* Update the position depending on pressed keys
*/
update: function() {
if(keystate[upArrow]){
this.y-=7;
}
if(keystate[downArrow]){
this.y+=7;
}},
/**
* Draw the player paddle to the canvas
*/
draw: function() {
ctx.fillRect(this.x, this.y, this.width, this.height);
}
}
/**
* The ai paddle
*
* @type {Object}
*/
var ai = {
x: null,
y: null,
width: 20,
height: 100,
/**
* Update the position depending on the ball position
*/
update: function() {
var desty = ball.y-(this.height - ball.side)*0.5
this.y += (desty-this.y)*0.2;
},
draw: function() {
ctx.fillRect(this.x, this.y, this.width, this.height);
}
}
/**
* The ball object
*
* @type {Object}
*/
var ball = {
x: null,
y: null,
vel:null,
side: 20,
speed:5,
update: function() {
this.x += this.vel.x;
this.y += this.vel.y;
if(0>this.y || this.y+this.side>HEIGHT){
var offset = this.vel.y<0 ? 0-this.y : HEIGHT-(this.y+this.side);
this.y+=2*offset
this.vel.y*=-1;
}
var AABBIntersect = function(ax, ay, aw, ah, bx, by, bw, bh) {
return ax < bx+bw && ay < by+bh && bx < ax+aw && by < ay+ah;
};
var pdle = this.vel.x<0 ? player : ai;
if(AABBIntersect(pdle.x,pdle.y,pdle.width,pdle.height, this.x, this.y, this.side, this.side)){
this.x = pdle===player ? player.x + player.width : ai.x - this.side;
var n = (this.y+this.side-pdle.y)/(pdle.height+this.side)
var phi = 0.25*pi*(2*n - 1) // pi/4 = 45
this.x = pdle===player ? player.x+player.width : ai.x - this.side;
var n = (this.y+this.side - pdle.y)/(pdle.height+this.side);
var phi = 0.25*pi*(2*n - 1); // pi/4 = 45
this.vel.x = (pdle===player ? 1 : -1)*this.speed*Math.cos(phi);
this.vel.y = this.speed*Math.sin(phi);
}
if(ball.x<0){
computerCount =+1;
ball.x = (WIDTH - ball.side)/2;
ball.y = (HEIGHT - ball.side)/2;
}
},
// reset the ball when ball outside of the canvas in the
draw: function() {
ctx.fillRect(this.x, this.y, this.side, this.side);
}
}
function score(){
}
/**
* Starts the game
*/
function main() {
// create, initiate and append game canvas
canvas = document.createElement("canvas");
canvas.width = WIDTH;
canvas.height = HEIGHT;
ctx = canvas.getContext("2d");
document.body.appendChild(canvas);
canvas2 = document.createElement("canvas");
canvas2.setAttribute("id", "scoreBoard");
canvas2.width = 200;
canvas2.height = 100;
ctx2 = canvas2.getContext("2d");
document.body.appendChild(canvas2);
keystate = {};
document.addEventListener("keydown" , function(event){
keystate[event.keyCode] = true;
})
document.addEventListener("keyup" , function(event){
delete keystate[event.keyCode];
})
init();
var loop = function() {
update();
draw();
window.requestAnimationFrame(loop, canvas);
};
window.requestAnimationFrame(loop, canvas);
}
/**
* Initatite game objects and set start positions
*/
function init() {
player.x = player.width;
player.y = (HEIGHT - player.height)/2;
ai.x = WIDTH - (player.width + ai.width);
ai.y = (HEIGHT - ai.height)/2;
ball.x = (WIDTH - ball.side)/2;
ball.y = (HEIGHT - ball.side)/2;
ball.vel = {
x:ball.speed,
y: 0
}
}
/**
* Update all game objects
*/
function update() {
ball.update();
player.update();
ai.update();
}
function draw(){
ctx.fillStyle = "black"
ctx.fillRect(0,0,WIDTH,HEIGHT)
ctx.save();
ctx2.fillStyle = "red"
ctx2.fillText(String(computerCount),100,100)
ctx2.fillText("VS",120,100)
ctx2.fillText(String(playerCount),175,100)
ctx2.font = "bold 40px monaco"
ctx.fillStyle = "white"
ball.draw();
player.draw();
ai.draw();
var w=4;
var x= (WIDTH-w)*0.5;
var y=2;
var step = HEIGHT/20;
while(y<HEIGHT){
ctx.fillRect(x,y+step*0.25,w,step*0.5)
y+=step;
}
ctx.restore();
}
// start and run the game
main();
</script>
</body>
</html>
Как обычно Клейтон! Огромное спасибо! Теперь я постараюсь сделать игру Doodle Jump! –