我目前正在开发一个小游戏,并尝试在撞到障碍物时实现“游戏结束”功能。但每次添加完整的代码以实现该功能后,它都会破坏一切。如果有人能帮助我,我会非常感激。我不确定问题出在哪里。
这是全部代码(仅 JS 部分):
这是全部代码(仅 JS 部分):
var myGamePiece;
var myObstacle;
function startGame() {
myGamePiece = new component(30, 30, "red", 225, 225);
myObstacle = new component(40, 40, "green", 300, 120);
myGameArea.start();
}
var myGameArea = {
canvas : document.createElement("canvas"),
start : function() {
this.canvas.width = 1000;
this.canvas.height = 890;
this.context = this.canvas.getContext("2d");
document.body.insertBefore(this.canvas, document.body.childNodes[0]);
this.frameNo = 0;
this.interval = setInterval(updateGameArea, 20);
window.addEventListener('keydown', function (e) {
e.preventDefault();
myGameArea.keys = (myGameArea.keys || []);
myGameArea.keys[e.keyCode] = (e.type == "keydown");
})
window.addEventListener('keyup', function (e) {
myGameArea.keys[e.keyCode] = (e.type == "keydown");
})
},
stop : function() {
clearInterval(this.interval);
},
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.width = width;
this.height = height;
this.speed = 0;
this.angle = 0;
this.moveAngle = 0;
this.x = x;
this.y = y;
this.update = function() {
ctx = myGameArea.context;
ctx.save();
ctx.translate(this.x, this.y);
ctx.rotate(this.angle);
ctx.fillStyle = color;
ctx.fillRect(this.width / -2, this.height / -2, this.width, this.height);
ctx.restore();
}
this.newPos = function() {
this.angle += this.moveAngle * Math.PI / 180;
this.x += this.speed * Math.sin(this.angle);
this.y -= this.speed * Math.cos(this.angle);
}
}
function updateGameArea() {
myGameArea.clear();
myGamePiece.moveAngle = 0;
myGamePiece.speed = 0;
myObstacle.update();
if (myGameArea.keys && myGameArea.keys[37]) {myGamePiece.moveAngle = -2; }
if (myGameArea.keys && myGameArea.keys[39]) {myGamePiece.moveAngle = 2; }
if (myGameArea.keys && myGameArea.keys[38]) {myGamePiece.speed= 2; }
if (myGameArea.keys && myGameArea.keys[40]) {myGamePiece.speed= -2; }
myGamePiece.newPos();
myGamePiece.update();
}
startGame();