games/2/js/index.js

var LEVELS = [
    ["                                                                                ",
        "                                                                                ",
        "                                                                                ",
        "                                                                                ",
        "                                                                                ",
        "                                                                                ",
        "                                                                  xxx           ",
        "                                                   xx      xx    xx!xx          ",
        "                                    o o      xx                  x!!!x          ",
        "                                                                 xx!xx          ",
        "                                   xxxxx                          xvx           ",
        "                                                                            xx  ",
        "  xx                                      o o                                x  ",
        "  x                     o                                                    x  ",
        "  x                                      xxxxx                             o x  ",
        "  x          xxxx       o                                                    x  ",
        "  x  @       x  x                                                xxxxx       x  ",
        "  xxxxxxxxxxxx  xxxxxxxxxxxxxxx   xxxxxxxxxxxxxxxxxxxx     xxxxxxx   xxxxxxxxx  ",
        "                              x   x                  x     x                    ",
        "                              x!!!x                  x!!!!!x                    ",
        "                              x!!!x                  x!!!!!x                    ",
        "                              xxxxx                  xxxxxxx                    ",
        "                                                                                ",
        "                                                                                "
    ],
    ["                                      x!!x                        xxxxxxx                                    x!x  ",
        "                                      x!!x                     xxxx     xxxx                                 x!x  ",
        "                                      x!!xxxxxxxxxx           xx           xx                                x!x  ",
        "                                      xx!!!!!!!!!!xx         xx             xx                               x!x  ",
        "                                       xxxxxxxxxx!!x         x                                    o   o   o  x!x  ",
        "                                                xx!x         x     o   o                                    xx!x  ",
        "                                                 x!x         x                                xxxxxxxxxxxxxxx!!x  ",
        "                                                 xvx         x     x   x                        !!!!!!!!!!!!!!xx  ",
        "                                                             xx  |   |   |  xx            xxxxxxxxxxxxxxxxxxxxx   ",
        "                                                              xx!!!!!!!!!!!xx            v                        ",
        "                                                               xxxx!!!!!xxxx                                      ",
        "                                               x     x            xxxxxxx        xxx         xxx                  ",
        "                                               x     x                           x x         x x                  ",
        "                                               x     x                             x         x                    ",
        "                                               x     x                             xx        x                    ",
        "                                               xx    x                             x         x                    ",
        "                                               x     x      o  o     x   x         x         x                    ",
        "               xxxxxxx        xxx   xxx        x     x               x   x         x         x                    ",
        "              xx     xx         x   x          x     x     xxxxxx    x   x   xxxxxxxxx       x                    ",
        "             xx       xx        x o x          x    xx               x   x   x               x                    ",
        "     @       x         x        x   x          x     x               x   x   x               x                    ",
        "    xxx      x         x        x   x          x     x               x   xxxxx   xxxxxx      x                    ",
        "    x x      x         x       xx o xx         x     x               x     o     x x         x                    ",
        "!!!!x x!!!!!!x         x!!!!!!xx     xx!!!!!!!!xx    x!!!!!!!!!!     x     =     x x         x                    ",
        "!!!!x x!!!!!!x         x!!!!!xx       xxxxxxxxxx     x!!!!!!!xx!     xxxxxxxxxxxxx xx  o o  xx                    ",
        "!!!!x x!!!!!!x         x!!!!!x    o                 xx!!!!!!xx !                    xx     xx                     ",
        "!!!!x x!!!!!!x         x!!!!!x                     xx!!!!!!xx  !                     xxxxxxx                      ",
        "!!!!x x!!!!!!x         x!!!!!xx       xxxxxxxxxxxxxx!!!!!!xx   !                                                  ",
        "!!!!x x!!!!!!x         x!!!!!!xxxxxxxxx!!!!!!!!!!!!!!!!!!xx    !                                                  ",
        "!!!!x x!!!!!!x         x!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!xx     !                                                  "
    ],
    ["                                                                                                              ",
        "                                                                                                              ",
        "                                                                                                              ",
        "                                                                                                              ",
        "                                                                                                              ",
        "                                        o                                                                     ",
        "                                                                                                              ",
        "                                        x                                                                     ",
        "                                        x                                                                     ",
        "                                        x                                                                     ",
        "                                        x                                                                     ",
        "                                       xxx                                                                    ",
        "                                       x x                 !!!        !!!  xxx                                ",
        "                                       x x                 !x!        !x!                                     ",
        "                                     xxx xxx                x          x                                      ",
        "                                      x   x                 x   oooo   x       xxx                            ",
        "                                      x   x                 x          x      x!!!x                           ",
        "                                      x   x                 xxxxxxxxxxxx       xxx                            ",
        "                                     xx   xx      x   x      x                                                ",
        "                                      x   xxxxxxxxx   xxxxxxxx              x x                               ",
        "                                      x   x           x                    x!!!x                              ",
        "                                      x   x           x                     xxx                               ",
        "                                     xx   xx          x                                                       ",
        "                                      x   x= = = =    x            xxx                                        ",
        "                                      x   x           x           x!!!x                                       ",
        "                                      x   x    = = = =x     o      xxx       xxx                              ",
        "                                     xx   xx          x                     x!!!x                             ",
        "                              o   o   x   x           x     x                xxv        xxx                   ",
        "                                      x   x           x              x                 x!!!x                  ",
        "                             xxx xxx xxx xxx     o o  x!!!!!!!!!!!!!!x                   vx                   ",
        "                             x xxx x x xxx x          x!!!!!!!!!!!!!!x                                        ",
        "                             x             x   xxxxxxxxxxxxxxxxxxxxxxx                                        ",
        "                             xx           xx                                         xxx                      ",
        "  xxx                         x     x     x                                         x!!!x                xxx  ",
        "  x x                         x    xxx    x                                          xxx                 x x  ",
        "  x                           x    xxx    xxxxxxx                        xxxxx                             x  ",
        "  x                           x           x                              x   x                             x  ",
        "  x                           xx          x                              x x x                             x  ",
        "  x                                       x       |xxxx|    |xxxx|     xxx xxx                             x  ",
        "  x                xxx             o o    x                              x         xxx                     x  ",
        "  x               xxxxx       xx          x                             xxx       x!!!x          x         x  ",
        "  x               oxxxo       x    xxx    x                             x x        xxx          xxx        x  ",
        "  x                xxx        xxxxxxxxxxxxx  x oo x    x oo x    x oo  xx xx                    xxx        x  ",
        "  x      @          x         x           x!!x    x!!!!x    x!!!!x    xx   xx                    x         x  ",
        "  xxxxxxxxxxxxxxxxxxxxxxxxxxxxx           xxxxxxxxxxxxxxxxxxxxxxxxxxxxx     xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx  ",
        "                                                                                                              ",
        "                                                                                                              "
    ],
    ["                                                                                                  xxx x       ",
        "                                                                                                      x       ",
        "                                                                                                  xxxxx       ",
        "                                                                                                  x           ",
        "                                                                                                  x xxx       ",
        "                          o                                                                       x x x       ",
        "                                                                                             o o oxxx x       ",
        "                   xxx                                                                                x       ",
        "       !  o  !                                                xxxxx xxxxx xxxxx xxxxx xxxxx xxxxx xxxxx       ",
        "       x     x                                                x   x x   x x   x x   x x   x x   x x           ",
        "       x= o  x            x                                   xxx x xxx x xxx x xxx x xxx x xxx x xxxxx       ",
        "       x     x                                                  x x   x x   x x   x x   x x   x x     x       ",
        "       !  o  !            o                                  xxxx xxxxx xxxxx xxxxx xxxxx xxxxx xxxxxxx       ",
        "                                                                                                              ",
        "          o              xxx                              xx                                                  ",
        "                                                                                                              ",
        "                                                                                                              ",
        "                                                      xx                                                      ",
        "                   xxx         xxx                                                                            ",
        "                                                                                                              ",
        "                          o                                                     x      x                      ",
        "                                                          xx     xx                                           ",
        "             xxx         xxx         xxx                                 x                  x                 ",
        "                                                                                                              ",
        "                                                                 ||                                           ",
        "  xxxxxxxxxxx                                                                                                 ",
        "  x         x o xxxxxxxxx o xxxxxxxxx o xx                                                x                   ",
        "  x         x   x       x   x       x   x                 ||                  x     x                         ",
        "  x  @      xxxxx   o   xxxxx   o   xxxxx                                                                     ",
        "  xxxxxxx                                     xxxxx       xx     xx     xxx                                   ",
        "        x=                  =                =x   x                     xxx                                   ",
        "        xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx   x!!!!!!!!!!!!!!!!!!!!!xxx!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!",
        "                                                  xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
        "                                                                                                              "
    ]
];


function Vector(x, y) {
    this.x = x;
    this.y = y;
}

Vector.prototype.plus = function(other) {
    return new Vector(this.x + other.x, this.y + other.y);
};

Vector.prototype.times = function(scale) {
    return new Vector(this.x * scale, this.y * scale);
};

// Note: uppercase words are used that means constructor are values
var actorchars = {
    "@": Player,
    "o": Coin,
    "=": Lava,
    "|": Lava,
    "v": Lava
};

function Player(pos) {
    this.pos = pos.plus(new Vector(0, -.5));
    this.size = new Vector(.5, 1);
    this.speed = new Vector(0, 0);
}
Player.prototype.type = "player";

function Lava(pos, ch) {
    this.pos = pos;
    this.size = new Vector(1, 1);
    if (ch === "=")
        this.speed = new Vector(2, 0);
    else if (ch === '|')
        this.speed = new Vector(0, 2);
    else if (ch === 'v') {
        this.speed = new Vector(0, 3);
        this.repeatPos = pos;
    }
}
Lava.prototype.type = "Lava";

function Coin(pos) {
    this.basePos = this.pos = pos;
    this.size = new Vector(.6, .6);
    // take a look back
    this.wobble = Math.random() * Math.PI * 2;
}
Coin.prototype.type = "coin";

Level.prototype.isFinished = function() {
    return this.status != null && this.finishDelay < 0;
};

function Level(plan) {
    this.width = plan[0].length;
    this.height = plan.length;
    this.grid = [];
    this.actors = [];

    for (var y = 0; y < this.height; y++) {
        var line = plan[y],
            gridLine = [];
        for (var x = 0; x < this.width; x++) {
            var ch = line[x],
                fieldType = null;
            var Actor = actorchars[ch];
            if (Actor)
                this.actors.push(new Actor(new Vector(x, y), ch));
            else if (ch === "x")
                fieldType = "wall";
            else if (ch === "!")
                fieldType = "lava";
            else if (ch === "|")
                fieldType = "lava";
            else if (ch === "=")
                fieldType = "lava";
            else if (ch === "v") {
                fieldType = "lava";
                console.log(fieldType);
            }
            gridLine.push(fieldType)
        }
        this.grid.push(gridLine);
    }
    this.player = this.actors.filter(function(actor) {
        return actor.type === "player"
    })[0];
    this.status = this.finishDelay = null;
}

function element(name, className) {
    var elem = document.createElement(name);
    if (className) elem.className = className;
    return elem;
}

function DOMDisplay(parent, level) {
    this.wrap = parent.appendChild(element("div", "game"));
    this.level = level;

    this.wrap.appendChild(this.drawBackground());
    this.actorLayer = null;
    this.drawFrame();
}


var scale = 15;


DOMDisplay.prototype.drawBackground = function() {
    var table = element("table", "background");
    table.style.width = this.level.width * scale + "px";
    table.style.height = this.level.height * scale + "px";
    this.level.grid.forEach(function(row) {
        var rowElement = table.appendChild(element("tr"));
        rowElement.style.height = scale + "px";
        row.forEach(function(type) {
            rowElement.appendChild(element("td", type));
        });
    });
    return table;
};

DOMDisplay.prototype.drawActors = function() {
    var wrap = element("div");
    this.level.actors.forEach(function(actor) {
        var rect = wrap.appendChild(element("div", "actor " + actor.type));
        rect.style.width = actor.size.x * scale + "px";
        rect.style.height = actor.size.y * scale + "px";
        rect.style.left = actor.pos.x * scale + "px";
        rect.style.top = actor.pos.y * scale + "px";
    });
    return wrap;
}

DOMDisplay.prototype.drawFrame = function() {
    if (this.actorLayer)
        this.wrap.removeChild(this.actorLayer);
    this.actorLayer = this.wrap.appendChild(this.drawActors());
    this.wrap.className = "game " + (this.level.status || "");
    this.scrollPlayerIntoView();
};


// clear it later
DOMDisplay.prototype.scrollPlayerIntoView = function() {
    var width = this.wrap.clientWidth;
    var height = this.wrap.clientHeight;
    var margin = width / 3;

    // The viewport
    var left = this.wrap.scrollLeft,
        right = left + width;
    var top = this.wrap.scrollTop,
        bottom = top + height;

    var player = this.level.player;
    var center = player.pos.plus(player.size.times(0.5))
        .times(scale);

    if (center.x < left + margin)
        this.wrap.scrollLeft = center.x - margin;
    else if (center.x > right - margin)
        this.wrap.scrollLeft = center.x + margin - width;
    if (center.y < top + margin)
        this.wrap.scrollTop = center.y - margin;
    else if (center.y > bottom - margin)
        this.wrap.scrollTop = center.y + margin - height;
};

DOMDisplay.prototype.clear = function() {
    this.wrap.parentNode.removeChild(this.wrap);
};

Level.prototype.obstacleAt = function(pos, size) {
    var xStart = Math.floor(pos.x);
    var xEnd = Math.ceil(pos.x + size.x);
    var yStart = Math.floor(pos.y);
    var yEnd = Math.ceil(pos.y + size.y);

    if (xStart < 0 || xEnd > this.width || yStart < 0)
        return "wall";
    if (yEnd > this.height)
        return "lava";
    for (var y = yStart; y < yEnd; y++) {
        for (var x = xStart; x < xEnd; x++) {
            var fieldType = this.grid[y][x];
            if (fieldType) return fieldType;
        }
    }
};

Level.prototype.actorAt = function(actor) {
    for (var i = 0; i < this.actors.length; i++) {
        var other = this.actors[i];
        if (other != actor &&
            actor.pos.x + actor.size.x > other.pos.x &&
            actor.pos.x < other.pos.x + other.size.x &&
            actor.pos.y + actor.size.y > other.pos.y &&
            actor.pos.y < other.pos.y + other.size.y)
            return other;
    }
};

var maxStep = 0.05;

Level.prototype.animate = function(step, keys) {
    if (this.status != null)
        this.finishDelay -= step;

    while (step > 0) {
        var thisStep = Math.min(step, maxStep);
        this.actors.forEach(function(actor) {
            actor.act(thisStep, this, keys);
        }, this);
        step -= thisStep;
    }
};


Lava.prototype.act = function(step, level) {
    var newPos = this.pos.plus(this.speed.times(step));
    if (!level.obstacleAt(newPos, this.size))
        this.pos = newPos;
    else if (this.repeatPos)
        this.pos = this.repeatPos;
    else
        this.speed = this.speed.times(-1);
};

var wobbleSpeed = 8,
    wobbleDist = 0.07;

Coin.prototype.act = function(step) {
    this.wobble += step * wobbleSpeed;
    var wobblePos = Math.sin(this.wobble) * wobbleDist;
    this.pos = this.basePos.plus(new Vector(0, wobblePos));
};


var playerXSpeed = 10;

Player.prototype.moveX = function(step, level, keys) {
    this.speed.x = 0;
    if (keys.left) this.speed.x -= playerXSpeed;
    if (keys.right) this.speed.x += playerXSpeed;

    var motion = new Vector(this.speed.x * step, 0);
    var newPos = this.pos.plus(motion);
    var obstacle = level.obstacleAt(newPos, this.size);
    if (obstacle)
        level.playerTouched(obstacle);
    else
        this.pos = newPos;
};

var gravity = 30;
var jumpSpeed = 17;

Player.prototype.moveY = function(step, level, keys) {
    this.speed.y += step * gravity;
    var motion = new Vector(0, this.speed.y * step);
    var newPos = this.pos.plus(motion);
    var obstacle = level.obstacleAt(newPos, this.size);
    if (obstacle) {
        level.playerTouched(obstacle);
        if (keys.up && this.speed.y > 0)
            this.speed.y = -jumpSpeed;
        else
            this.speed.y = 0;
    } else {
        this.pos = newPos;
    }
};

Player.prototype.act = function(step, level, keys) {
    this.moveX(step, level, keys);
    this.moveY(step, level, keys);

    var otherActor = level.actorAt(this);
    if (otherActor)
        level.playerTouched(otherActor.type, otherActor);

    // Losing animation
    if (level.status == "lost") {
        this.pos.y += step;
        this.size.y -= step;
    }
};

Level.prototype.playerTouched = function(type, actor) {
    if (type == "lava" && this.status == null) {
        this.status = "lost";
        this.finishDelay = 1;
    } else if (type == "coin") {
        this.actors = this.actors.filter(function(other) {
            return other != actor;
        });
        if (!this.actors.some(function(actor) {
                return actor.type == "coin";
            })) {
            this.status = "won";
            this.finishDelay = 1;
        }
    }
};

var arrowCodes = { 37: "left", 38: "up", 39: "right" };

function trackKeys(codes) {
    var pressed = Object.create(null);

    function handler(event) {
        if (codes.hasOwnProperty(event.keyCode)) {
            var down = event.type == "keydown";
            pressed[codes[event.keyCode]] = down;
            event.preventDefault();
        }
    }
    addEventListener("keydown", handler);
    addEventListener("keyup", handler);
    return pressed;
}

function runAnimation(frameFunc) {
    var lastTime = null;

    function frame(time) {
        var stop = false;
        if (lastTime != null) {
            var timeStep = Math.min(time - lastTime, 100) / 1000;
            stop = frameFunc(timeStep) === false;
        }
        lastTime = time;
        if (!stop)
            requestAnimationFrame(frame);
    }
    requestAnimationFrame(frame);
}

var arrows = trackKeys(arrowCodes);

function runLevel(level, Display, andThen) {
    var display = new Display(document.body, level);
    runAnimation(function(step) {
        level.animate(step, arrows);
        display.drawFrame(step);
        if (level.isFinished()) {
            display.clear();
            if (andThen)
                andThen(level.status);
            return false;
        }
    });
}

function runGame(plans, Display) {
    function startLevel(n) {
        runLevel(new Level(plans[n]), Display, function(status) {
            if (status == "lost")
                startLevel(n);
            else if (n < plans.length - 1)
                startLevel(n + 1);
            else
                alert("You win!");
        });
    }
    startLevel(0);
}

runGame(LEVELS, DOMDisplay);