HTML5 Canvas + js游戏 |死亡重置游戏会改变游戏速度吗？

Question

我正在尝试使用 HTML5 的 canvas 和 javascript 制作游戏。我相信我一直在做所有事情 "okay" 直到我需要在死亡时重置游戏。我不太确定是什么导致了意外行为，但我有想法。

差不多，游戏以 'x' 速度运行，然后当它重置时一切都移动得更快。我没有改变任何速度的任何变量，在调试和检查我的代码时，新创建的对象的速度与游戏第一次启动时的速度相同，但它们移动得更快。如果您再次死亡，它会再次重置并运行得更快。死亡、冲洗、重复，它一直在加速，直到页面可能达到 "not responding" 状态。

我不确定我做错了什么导致速度差异或至少是速度差异的错觉。我有一个想法，它与我的游戏循环有关运行每次重置时都会多次进入永远，但我不明白 how/why 它会那样做。感谢任何反馈。

此外，如果您需要的代码比我在下面发布的更多，您可以访问我的测试页面查看所有代码：game test playground

var windowx,
windowy,
canvas,
player,
quadTree,
ctx;

var drawObjects;
var keyState;

var mainloop;
var animFrame;
var ONE_FRAME_TIME;

var reset = function () {

//get canvas and set height and width
canvas = document.getElementById('canvas');
canvas.setAttribute('width', windowx / 2);
canvas.setAttribute('height', windowy / 2);
ctx = canvas.getContext("2d");
drawObjects = [];
keyState = {};
quadTree = new Quadtree(quadTreeBounds);


//make the friendly square
player = new Rectangle(20, 20, 40, 40, 0, 0, XPhysicsBehaviorNormal, YPhysicsBehaviorNormal, XBoundaryBehaviorInCanvas, YBoundaryBehaviorInCanvas, playerObjectType, '#580000', null);
drawObjects.push(player);
drawObjects.push(new Rectangle(40, 100, canvas.width + (distanceOutsideCanvasBeforeDie / 2), canvas.clientHeight - 100, defaultEnemyRectangleVelocity, 0, null, YPhysicsBehaviorNormal, null, YBoundaryBehaviorInCanvas, enemyObjectType, null, OutOfCanvasDieBehavior));


backgroundMusicAudio.play();

//define main loop
mainloop = function () {
    buildQuadTree();
    updateGame();
    drawGame();
};

//define the windowanimationframeobject
animFrame = window.requestAnimationFrame ||
    window.webkitRequestAnimationFrame ||
    window.mozRequestAnimationFrame ||
    window.oRequestAnimationFrame ||
    window.msRequestAnimationFrame ||
    null;

if (animFrame !== null) {
    var recursiveAnim = function () {
        mainloop();
        animFrame(recursiveAnim, canvas);
    };

    // start the mainloop
    animFrame(recursiveAnim, canvas);
} else {
    // fallback to setInterval if the browser doesn't support requestAnimationFrame
    ONE_FRAME_TIME = 1000.0 / 60.0;
    setInterval(mainloop, ONE_FRAME_TIME);
}
}

$(function () {
//get window width and height;
windowx = window.innerWidth;
windowy = window.innerHeight;

reset();

$(document).on('change', '#sound-enabled-toggle', function() {
    var isChecked = $(this).is(':checked');
    $('#sound-enabled-toggle').blur();
    if (isChecked) {
        backgroundMusicAudio.play();
        playerJumpAudio = playerJumpMusicAudioSetup();
        playerBlinkAudio = playerBlinkMusicAudioSetup();
    } else {
        backgroundMusicAudio.pause();
        playerJumpAudio = new Audio('');
        playerBlinkAudio = new Audio('');
    }
});
});

//left the function here in case I need to do anything else but for now it's  just clearing.
function buildQuadTree() {
    quadTree.clear();
}

function updateGame() {

//determine if there are any keys pushed at the current point
keyPressActions();

//loop for calculating and updating all objects positions/values.
for (var i = 0; i < drawObjects.length; i++) {
    var object = drawObjects[i];
    quadTree.insert(new SimpleRectangle(object.x, object.y, object.width || (object.radius * 2), object.height || (object.radius * 2), object.name));
    object.update();

    //roundFloatingPoints Numbers to 2 decimal places
    roundObjectVelocitiesAndPoints(object);
}
PlayerDeathTrigger(player);
}

function drawGame() {
//clear the canvas
ctx.clearRect(0, 0, canvas.width, canvas.height);
ctx.font = "20px Verdana";
ctx.fillText("100,000", (canvas.width * .8), (canvas.clientHeight * .1));
ctx.font = "15px Verdana";
ctx.fillText("Temp Score", (canvas.width * .8), (canvas.clientHeight * .05));

//draw all objects in drawObjects
for (var i = 0; i < drawObjects.length; i++) {
    var object = drawObjects[i];
    object.draw();
}
}

Answer 1

总的来说，我建议重构这段代码，这样您的重置函数就不会重新创建那么多对象。基本上重置功能只是重新创建大量的游戏逻辑。

您发现的具体问题似乎是由于您在每次重置时调用 setInterval 而没有清除之前的间隔。请参阅下面的代码，并进行最少的更改以防止出现此问题。

var windowx,
    windowy,
    canvas,
    player,
    quadTree,
    ctx,
    gameLoop;

var drawObjects;
var keyState;

var mainloop;
var animFrame;
var ONE_FRAME_TIME;

var reset = function() {

    // Remove our old game loop
    clearInterval(gameLoop);

    //get canvas and set height and width
    canvas = document.getElementById('canvas');
    canvas.setAttribute('width', windowx / 2);
    canvas.setAttribute('height', windowy / 2);
    ctx = canvas.getContext("2d");
    drawObjects = [];
    keyState = {};
    quadTree = new Quadtree(quadTreeBounds);


    //make the friendly square
    player = new Rectangle(20, 20, 40, 40, 0, 0, XPhysicsBehaviorNormal, YPhysicsBehaviorNormal, XBoundaryBehaviorInCanvas, YBoundaryBehaviorInCanvas, playerObjectType, '#580000', null);
    drawObjects.push(player);
    drawObjects.push(new Rectangle(40, 100, canvas.width + (distanceOutsideCanvasBeforeDie / 2), canvas.clientHeight - 100, defaultEnemyRectangleVelocity, 0, null, YPhysicsBehaviorNormal, null, YBoundaryBehaviorInCanvas, enemyObjectType, null, OutOfCanvasDieBehavior));


    backgroundMusicAudio.play();

    //define main loop
    mainloop = function() {
        buildQuadTree();
        updateGame();
        drawGame();
    };

    //define the windowanimationframeobject
    animFrame = window.requestAnimationFrame ||
        window.webkitRequestAnimationFrame ||
        window.mozRequestAnimationFrame ||
        window.oRequestAnimationFrame ||
        window.msRequestAnimationFrame ||
        null;

    if (animFrame !== null) {
        var recursiveAnim = function() {
            mainloop();
            animFrame(recursiveAnim, canvas);
        };

        // start the mainloop
        animFrame(recursiveAnim, canvas);
    } else {
        // fallback to setInterval if the browser doesn't support requestAnimationFrame
        ONE_FRAME_TIME = 1000.0 / 60.0;
        gameLoop = setInterval(mainloop, ONE_FRAME_TIME);
    }
}

$(function() {
    //get window width and height;
    windowx = window.innerWidth;
    windowy = window.innerHeight;

    reset();

    $(document).on('change', '#sound-enabled-toggle', function() {
        var isChecked = $(this).is(':checked');
        $('#sound-enabled-toggle').blur();
        if (isChecked) {
            backgroundMusicAudio.play();
            playerJumpAudio = playerJumpMusicAudioSetup();
            playerBlinkAudio = playerBlinkMusicAudioSetup();
        } else {
            backgroundMusicAudio.pause();
            playerJumpAudio = new Audio('');
            playerBlinkAudio = new Audio('');
        }
    });
});

//left the function here in case I need to do anything else but for now it's  just clearing.
function buildQuadTree() {
    quadTree.clear();
}

function updateGame() {

    //determine if there are any keys pushed at the current point
    keyPressActions();

    //loop for calculating and updating all objects positions/values.
    for (var i = 0; i < drawObjects.length; i++) {
        var object = drawObjects[i];
        quadTree.insert(new SimpleRectangle(object.x, object.y, object.width || (object.radius * 2), object.height || (object.radius * 2), object.name));
        object.update();

        //roundFloatingPoints Numbers to 2 decimal places
        roundObjectVelocitiesAndPoints(object);
    }
    PlayerDeathTrigger(player);
}

function drawGame() {
    //clear the canvas
    ctx.clearRect(0, 0, canvas.width, canvas.height);
    ctx.font = "20px Verdana";
    ctx.fillText("100,000", (canvas.width * .8), (canvas.clientHeight * .1));
    ctx.font = "15px Verdana";
    ctx.fillText("Temp Score", (canvas.width * .8), (canvas.clientHeight * .05));

    //draw all objects in drawObjects
    for (var i = 0; i < drawObjects.length; i++) {
        var object = drawObjects[i];
        object.draw();
    }
}

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