Question

我需要在这里添加什么代码，以便在英雄触及墙壁时游戏将重新启动。我需要一些帮助。

// Create the canvas
var canvas = document.createElement("canvas");
var ctx = canvas.getContext("2d");
canvas.width = 512;
canvas.height = 480;
document.body.appendChild(canvas);
// Background image
var bgReady = false;
var bgImage = new Image();
bgImage.onload = function () {
    bgReady = true;
};
bgImage.src = "images/bg.jpg";

// Hero image
var heroReady = false;
var heroImage = new Image();
heroImage.onload = function () {
    heroReady = true;
};
heroImage.src = "images/hero.jpg";

// Monster image
var monsterReady = false;
var monsterImage = new Image();
monsterImage.onload = function () {
    monsterReady = true;
};
monsterImage.src = "images/monster.jpg";

// Game objects
var hero = {
    speed: 256 // movement in pixels per second
};
var monster = {};
var monstersCaught = 0;

// Handle keyboard controls
var keysDown = {};
addEventListener("keydown", function (e) {
    keysDown[e.keyCode] = true;
}, false);
addEventListener("keyup", function (e) {
    delete keysDown[e.keyCode];
}, false);

// Reset the game when the player catches a monster
var reset = function () {
    hero.x = canvas.width / 2;
    hero.y = canvas.height / 2;

    // Throw the monster somewhere on the screen randomly
    monster.x = 32 + (Math.random() * (canvas.width - 64));
    monster.y = 32 + (Math.random() * (canvas.height - 64));

};

// Update game objects
var update = function (modifier) {
    if (38 in keysDown) { // Player holding up
        hero.y -= hero.speed * modifier;
    }
    if (40 in keysDown) { // Player holding down
        hero.y += hero.speed * modifier;
    }
    if (37 in keysDown) { // Player holding left
        hero.x -= hero.speed * modifier;
    }
    if (39 in keysDown) { // Player holding right
        hero.x += hero.speed * modifier;
    }

    // Are they touching?
    if (
    hero.x <= (monster.x + 32) && monster.x <= (hero.x + 32) && hero.y <= (monster.y + 32) && monster.y <= (hero.y + 32)) {
        ++monstersCaught;
        reset();
    }
};

// Draw everything
var render = function () {
    if (bgReady) {
        ctx.drawImage(bgImage, 0, 0);
    }
    if (heroReady) {
        ctx.drawImage(heroImage, hero.x, hero.y);
    }
    if (monsterReady) {
        ctx.drawImage(monsterImage, monster.x, monster.y);
    }

    // Score
    ctx.fillStyle = "rgb(250, 250, 250)";
    ctx.font = "24px Helvetica";
    ctx.textAlign = "left";
    ctx.textBaseline = "top";
    ctx.fillText("Goblins caught: " + monstersCaught, 32, 32);
};

// The main game loop
var main = function () {
    var now = Date.now();
    var delta = now - then;
    update(delta / 1000);
    render();
    then = now;
    // Request to do this again ASAP
    requestAnimationFrame(main);
};

Answer 1

要检查播放器是否在画布之外，您可以执行此类操作

if( hero.x < -32 || hero.x > canvas.width + 32 || hero.y < -32 || hero.y > canvas.height + 32)
{
    reset();
}

如果这不起作用，请告诉我，您需要将此功能放在游戏循环中。要重置您的分数，只需更新您的reset函数以设置变量score = 0;您当然首先需要创建一个名为score的新变量：）

JQuery在编码方面需要帮助

1 个答案: