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main.js
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/* Dasca, an idle game by @CylonicRaider (github.com/CylonicRaider/dasca)
* Game implementation */
"use strict";
/* *** Utilities *** */
function $id(id) {
return document.getElementById(id);
}
function $idx(id, elem) {
return elem.querySelector("#" + id);
}
function $sel(sel, elem) {
return (elem || document).querySelector(sel);
}
function $selAll(sel, elem) {
return (elem || document).querySelectorAll(sel);
}
function $listen(elem, event, callback) {
if (typeof elem == "string") elem = $id(elem);
elem.addEventListener(event, callback);
}
function $query(str) {
str = str.replace(/^[#?]/, "");
var ret = {}, entries = str.split("&");
for (var i = 0; i < entries.length; i++) {
var m = /^([^=]*)(?:=(.*))?$/.exec(entries[i]);
var name = m[1], value = m[2] || null;
ret[decodeURIComponent(name)] =
(value) ? decodeURIComponent(value) : value;
}
return ret;
}
var QUERY = $query(location.search);
/* Create a DOM element */
function $makeNode(tag, className, attrs, children) {
/* Allow omitting parameters */
if (Array.isArray(className)) {
if (! attrs && ! children) {
children = className;
attrs = null;
className = null;
}
} else if (typeof className == "object" && className != null) {
if (! children) {
children = attrs;
attrs = className;
className = null;
}
} else if (Array.isArray(attrs) || typeof attrs == "string") {
if (! children) {
children = attrs;
attrs = null;
}
}
/* Create node */
var ret = document.createElement(tag);
/* Set classes */
if (className) ret.className = className;
/* Set additional attributes */
if (attrs) {
for (var name in attrs) {
if (! attrs.hasOwnProperty(name)) continue;
ret.setAttribute(name, attrs[name]);
}
}
/* Add children */
if (children) {
if (typeof children == "string") children = [children];
for (var i = 0; i < children.length; i++) {
var e = children[i];
if (! e) {
/* Allow conditional node omission */
} else if (typeof e == "string") {
/* Strings become text nodes */
ret.appendChild(document.createTextNode(e));
} else if (typeof e != "object") {
/* Other primitive types are not allowed */
throw new Error("Bad child encountered during DOM node creation");
} else if (Array.isArray(e)) {
/* Arrays are handled recursively */
ret.appendChild($makeNode.apply(null, e));
} else {
/* Everything else is assumed to be a DOM node */
ret.appendChild(e);
}
}
}
return ret;
}
/* Replace a CSS class with another */
function $replaceClass(elem, fromCls, toCls) {
if (elem.classList.contains(fromCls)) {
elem.classList.remove(fromCls);
elem.classList.add(toCls);
}
}
/* Round a numeric value for display */
function displayRound(v) {
return Math.round(v * 1e4) / 1e4;
}
/* base64-encode a string with line wrapping */
function b64encw(s) {
// "Binary" to "ASCII"?
return btoa(s).replace(/.{78}/g, "$&\n").trim();
}
/* Undo b64encw */
function b64decw(s) {
// atob is tolerant enough. :}
return atob(s);
}
/* *** UI control functions *** */
/* Show the given UI element, hiding any siblings and showing all its
* showable parents */
function showNode(node) {
if (! node) return;
/* Resolve ID-s */
if (typeof node == "string") node = $id(node);
/* Hide siblings */
var prev = node.previousElementSibling, next = node.nextElementSibling;
while (prev) {
if (prev.classList.contains("selectable"))
prev.classList.remove("selected");
prev = prev.previousElementSibling;
}
while (next) {
if (next.classList.contains("selectable"))
next.classList.remove("selected");
next = next.nextElementSibling;
}
/* Show parent */
showNode(node.parentNode);
/* Show node */
if (node.classList && node.classList.contains("selectable"))
node.classList.add("selected");
}
/* Hide all selectable children of node
*
* Approximate opposite of showNode. */
function hideChildren(node) {
if (! node) return;
/* Resolve ID-s */
if (typeof node == "string") node = $id("node");
/* Hide children */
for (var ch = node.firstElementChild; ch; ch = ch.nextElementSibling) {
if (ch.classList.contains("selectable"))
ch.classList.remove("selected");
}
}
/* *** Game mechanics *** */
/* The main game object
*
* state is a game state to restore (see below for details); storage is a
* StorageCell instance used for state persistence (or absent for none).
* If state is falsy, a new one is created; otherwise, state is deserialized.
* If storage is truthy and state is null, the constructor attempts to load
* a state from the storage (thus, passing an empty string as the state
* forces creating a new one). */
function Game(state, storage) {
this._env = Object.create(window);
this._env.game = this;
if (storage && state == null) {
state = storage.loadRaw();
}
if (! state) {
this.state = new GameState(this);
this.state.scheduler.addContTask(this.createTask("_updateVars"));
} else {
this.state = deserialize(state, this._env);
}
this.state.scheduler._onerror = this._onerror.bind(this);
this.storage = storage;
this.ui = new GameUI(this);
this.story = new GameStory(this);
this.animator = new Animator(0.2);
this.running = true;
this.paused = false;
this.ui.render();
if (state) {
this.pause(false);
} else {
this.story.init();
}
this.state.scheduler.run();
this.animator.run();
}
Game.prototype = {
/* Save the game state into a string */
save: function() {
var st = serialize(this.state);
if (this.storage) this.storage.saveRaw(st);
return st;
},
/* Mount the game into the given node */
mount: function(node) {
return this.ui.mount(node);
},
/* Unmount the game from its current parent node, if any */
unmount: function() {
return this.ui.unmount();
},
/* Get the value of a flag */
getFlag: function(name) {
return this.state.flags.get(name);
},
/* Set a flag; return whether the value changed */
setFlag: function(name) {
return this.state.flags.set(name, true);
},
/* Clear a flag; return whether the value changed */
clearFlag: function(name) {
return this.state.flags.set(name, false);
},
/* Toggle a flag */
toggleFlag: function(name) {
this.state.flags.set(name, ! this.state.flags.get(name));
},
/* Create a task for addTask
*
* Arguments are passed as an array. */
createTaskEx: function(method, args) {
var m = ("game." + method).match(/^(.+)\.([^.]+)$/);
return new CachingAction(m[1], m[2], args, this._env);
},
/* Create a task for addTask
*
* Arguments are passed variadically. */
createTask: function(method) {
return this.createTaskEx(method,
Array.prototype.slice.call(arguments, 1));
},
/* Schedule an Action to be run */
addTaskEx: function(delay, subject, method, args) {
var task = new CachingAction(subject, method, args, this._env);
return this.state.scheduler.addTaskIn(task, delay);
},
/* Convenience wrapper for addTaskEx()
*
* Arguments are passed variadically. */
addTask: function(delay, method) {
var m = ("game." + method).match(/^(.+)\.([^.]+)$/);
var args = Array.prototype.slice.call(arguments, 2);
return this.addTaskEx(delay, m[1], m[2], args);
},
/* Schedule an Action to be run repeatedly */
addContTaskEx: function(subject, method, args) {
var task = new CachingAction(subject, method, args, this._env);
return this.state.scheduler.addContTask(task);
},
/* Schedule a function to be run repeatedly
*
* Arguments are passed variadically. */
addContTask: function(method) {
var m = ("game." + method).match(/^(.+)\.([^.]+)$/);
var args = Array.prototype.slice.call(arguments, 2);
return this.addContTaskEx(m[1], m[2], args);
},
/* Show a log message */
showMessage: function(msg) {
this.state.messages.push(msg);
this.ui._showMessage(msg);
},
/* Add a UI tab */
addTab: function(name, dispname, options) {
if (! options) options = {};
options.name = dispname;
if (! options.items) options.items = [];
if (! options.gauges) options.gauges = [];
if (this.state.tabOrder.indexOf(name) == -1)
this.state.tabOrder.push(name);
this.state.tabs[name] = options;
this.ui._addTab(name, dispname, options);
this.ui._updateItems(name, "items");
this.ui._updateItems(name, "gauges");
},
/* Select a UI tab */
showTab: function(name, hidden) {
if (hidden != null) this.state.tabs[name].hidden = hidden;
this.state.currentTab = name;
this.ui._updateItems(name, "items");
this.ui._updateItems(name, "gauges");
this.ui._showTab(name, this.state.tabs[name].hidden);
},
/* Create a Variable */
makeVariable: function(name, value, min, max) {
var v = new Variable(value, min, max);
this.state.variables[name] = v;
return v;
},
/* Return an object to hook up to other Variables as a derivative */
makeVariableHandler: function(name, factor) {
return this.createTaskEx("state.variables." + name + ".getValue",
factor);
},
/* Return the Variable with the given name */
getVariable: function(name) {
return this.state.variables[name];
},
/* Add an item */
addItem: function(type, name) {
var ctor = Item[type];
// HACK HACK HACK: Behold the finest JS magic!
var args = [null, this].concat(
Array.prototype.slice.call(arguments, 1));
var item = new (ctor.bind.apply(ctor, args))();
this.state.items[name] = item;
return item;
},
/* Show an item in a given UI tab, or hide it from there
*
* Items can be in multiple tabs; their nodes are transparently reparented
* on tab switches. */
showItem: function(tab, name, show) {
if (show == null) show = true;
var items = this.state.tabs[tab].items;
var idx = items.indexOf(name);
if (idx != -1) items.splice(idx, 1);
if (show) items.push(name);
this.ui._showItem(tab, name);
},
/* Hide the given item from sight */
hideItem: function(tab, name) {
/* Actually already implemented */
this.showItem(tab, name, false);
},
/* Remove the named item from storage and display */
removeItem: function(name) {
if (this.state.items[name])
this.state.items[name].__remove__();
delete this.state.items[name];
for (var t in this.state.tabs) {
if (! this.state.tabs.hasOwnProperty(t)) continue;
var items = this.state.tabs[t].items;
var idx = items.indexOf(name);
if (idx != -1) items.splice(idx, 1);
var gauges = this.state.tabs[t].gauges;
idx = gauges.indexOf(name);
if (idx != -1) gauges.splice(idx, 1);
}
this.ui._removeItem(name);
},
/* Show a gauge in a given UI tab or hide it */
showGauge: function(tab, name, show) {
if (show == null) show = true;
var items = this.state.tabs[tab].gauges;
var idx = items.indexOf(name);
if (idx != -1) items.splice(idx, 1);
if (show) items.push(name);
this.ui._showGauge(tab, name);
},
/* Hide the given gauge from sight */
hideGauge: function(tab, name) {
this.showGauge(tab, name, false);
},
/* Remove the given gauge from storage and display */
removeGauge: function(name) {
this.removeItem(name);
},
/* Pause the game */
pause: function(doPause) {
if (doPause == null) doPause = (! this.paused);
this.paused = doPause;
this.state.scheduler.running = (! doPause);
this.ui._updatePause();
if (! doPause) this.state.scheduler.run();
},
/* Stop running the game */
exit: function() {
this.save();
this.running = false;
this.state.scheduler.stop();
this.animator.stop();
},
/* Update the variables */
_updateVars: function(now) {
var v = this.state.variables, s = this.state.scheduler;
for (var name in v) {
if (! v.hasOwnProperty(name)) continue;
v[name].update(s);
}
for (var name in v) {
if (! v.hasOwnProperty(name)) continue;
v[name].updateLate();
}
},
/* Error handler */
_onerror: function(exc) {
console.error("Error in game:", exc);
this.state.scheduler.stop();
},
constructor: Game
};
/* Story-oriented functionality */
function GameStory(game) {
this.game = game;
}
GameStory.prototype = {
/* Intro sequence */
INTRO: [
[null, 1],
[["i", null, "Darkness."], 2],
[["i", null, "Silence."], 2],
[["i", null, "Confinement."], 3],
[["i", null, "Amnesia."], 2],
[null, 0, "story._finishIntro"]
],
/* Description of surroundings */
DESCRIPTION_START: [
["You are on the bridge of a spacecraft."],
["The windows would provide a wide panorama onto (presumably) space " +
"if they were not blocked by dark shutters."],
["The large instrument panel is lifeless; all needles are resting at " +
"zero."],
["You are strapped into a comfortable chair."],
["Behind you, there is a plain wall, pierced by a closed rectangular " +
"door, through which a round window peeks into a dark room."],
[null, 0, "story._finishLookAroundStart"]
],
/* Description of corridor */
DESCRIPTION_CORRIDOR: [
["The room's walls are covered by semitranslucent panels. The labels " +
"are hardly decipherable under the weak light."],
["Three doors lead out of the room; apart from the one to the bridge, " +
"there is one opposite to it, and one leads through the " +
"\u201cfloor\u201d."],
["On the wall to the bridge, one particular panel stands out."],
[null, 0, "story._finishLookAroundCorridor"]
],
/* Show a story fragment */
_showStoryFragment: function(parts, delayIfNot) {
this.game.state.scheduler.addContTask(new StoryFragment(this.game,
parts, delayIfNot));
},
/* Create a Task for invoking a particular method of the story */
_createTask: function(funcname) {
return this.game.createTaskEx("story." + funcname,
Array.prototype.slice.call(arguments, 1));
},
/* Start */
init: function() {
this.game.addTab("start", "Bridge", {hidden: true});
this._showStoryFragment(this.INTRO);
},
/* Show the first tab */
_finishIntro: function() {
this.game.ui.showControls();
this.game.addItem("Button", "show-lighter", "Check pockets",
"story.showLighter");
this.game.showItem("start", "show-lighter");
this.game.showTab("start");
},
/* Show the lighter */
showLighter: function() {
this.game.removeItem("show-lighter");
this.game.showMessage("You find a lighter.");
this.game.addItem("Lighter", "lighter", 100, 70).bindFlag("lighter-lit");
this.game.state.flags.derive("lit", "or", "lighter-lit");
this.game.state.flags.addLateHandler("lit",
this._createTask("_updateLighting"));
this.game.showItem("start", "lighter");
this.game.addItem("Button", "look-around-start", "Look around",
"story.lookAroundStart").showWhenActive("start", "lighter");
},
/* Write a message when lighting conditions change */
_updateLighting: function(state) {
if (! state) {
this.game.showMessage("It is dark again.");
}
},
/* Gather first impressions of the player's surroundings */
lookAroundStart: function() {
this.game.showTab("start", false);
this.game.removeItem("look-around-start");
this._showStoryFragment(this.DESCRIPTION_START,
"state.items.lighter.active");
},
/* Finish the first story fragment */
_finishLookAroundStart: function() {
this.game.addItem("Button", "pass-door", "Float through door",
"story.goToCorridor");
this.game.showItem("start", "pass-door");
},
/* Move to the next room */
goToCorridor: function() {
this.game.removeItem("pass-door");
if (this.game.state.items.lighter.active)
this.game.showMessage("The air flow lets the flame flare to a " +
"bright yellow.");
this.game.showMessage("You open the door and float through it.");
this.game.addTab("corridor", "Corridor");
this.game.showItem("corridor", "lighter");
this.game.addItem("Button", "look-around-corridor", "Look around",
"story.lookAroundCorridor").showWhenActive("corridor", "lighter");
this.game.showTab("corridor");
},
/* Look around there */
lookAroundCorridor: function() {
this.game.removeItem("look-around-corridor");
this._showStoryFragment(this.DESCRIPTION_CORRIDOR,
"state.items.lighter.active");
},
/* Finish looking around the corridor */
_finishLookAroundCorridor: function() {
this.game.makeVariable("energy", 0, 0, null);
this.game.addItem("Crank", "crank", 1, 2, 1).attachTo("energy");
var r = this.game.addItem("Reactor", "reactor");
r.attachTo("energy");
r.getVariable("power").addLateHandler(
this._createTask("_checkReactorPower"));
this.game.addItem("Button", "toggle-crank-display", "Open cover",
"toggleFlag", "crank-visible");
this.game.state.flags.addLateHandler("crank-visible",
this._createTask("_updateCrankDisplay"));
this.game.showItem("corridor", "toggle-crank-display");
this.game.addItem("Gauge", "energy-gauge", "energy", 1, "ENERGY",
[10, 100, 1000, 10000]);
this.game.showGauge("corridor", "energy-gauge");
},
/* Show or hide the crank and reactor depending on the state of the
* corresponding flag */
_updateCrankDisplay: function(visible) {
if (visible) {
if (this.game.setFlag("crank-intro-written"))
this.game.showMessage("There is a small handcrank nearby. It looks " +
"stiff, but still operational.");
this.game.showItem("corridor", "crank");
this.game.showItem("corridor", "reactor");
} else {
this.game.hideItem("corridor", "crank");
this.game.hideItem("corridor", "reactor");
}
var text = (visible) ? "Close cover" : "Open cover";
this.game.state.items["toggle-crank-display"].setText(text);
},
/* Check if the reactor has reached full power output */
_checkReactorPower: function(value, variable) {
if (value == variable.max && this.game.setFlag("reactor-full-power"))
this.toBeContinued();
},
/* Story is not developed beyond this point */
toBeContinued: function() {
this.game.showMessage(["i", null, "\u2014 T.B.C. \u2014"]);
},
constructor: GameStory
};
/* Show some messages with delays and optionally perform actions */
function StoryFragment(game, parts, delayIfNot) {
this._game = game;
this.parts = parts;
this.delayIfNot = delayIfNot;
this.nextTime = null;
this.nextIndex = 0;
}
StoryFragment.prototype = {
/* Estimation of reading speed based on old manually adjusted timings,
* in characters per second */
READ_SPEED: 10,
/* Check whether a new story fragment should be displayed
*
* ...And do so if necessary. Return true when nothing further has to be
* done. */
cb: function(now, scheduler) {
// Debugging hook.
if (this.nextTime != null && now < this.nextTime && ! QUERY.fast) return;
if (this.nextIndex >= this.parts.length) return true;
if (this.delayIfNot && ! findObject(this.delayIfNot, this._game)) {
this.nextTime = now + 1;
return;
}
var part = this.parts[this.nextIndex++];
if (part[0] != null) this._game.showMessage(part[0]);
var delay = part[1];
if (delay == null)
delay = (part[0] == null) ? 0 : part[0].length / this.READ_SPEED;
this.nextTime = now + delay;
if (part.length > 2) {
var task = this._game.createTaskEx.apply(this._game, part.slice(2));
task.cb.apply(task, arguments);
}
},
constructor: StoryFragment,
/* Deserialization */
__reinit__: function(env) {
this._game = env.game;
}
};
/* The (serializable) state of a game
*
* The constructor creates a new state; for restoring a saved one, use the
* deserialization function (in a suitable environment, which is created by
* the constructor of Game). */
function GameState(game) {
this._game = game;
// Scheduler.
this.scheduler = new Scheduler(10);
// FlagSet. Can be used to show one-off messages.
this.flags = new FlagSet();
// [string]. Stores log messages.
this.messages = [];
// {string -> Item}. The home of the items.
this.items = {};
// {string -> {string -> *}}. Name is the codename of a tab; value contains
// the display name of the tab as "name", the names of the items in this
// tab as "items", the names of the gauges in this tab as "gauges", and,
// optionally, whether its button should not be displayed as "hidden".
this.tabs = {};
// [string]. The order in which the tab buttons should be arranged.
this.tabOrder = [];
// string. Contains the codename of the current tab, or null for none.
this.currentTab = null;
// {string -> Variable}. The home of the variables.
this.variables = {};
// {string -> *}. Miscellaneous values.
this.misc = {};
}
GameState.prototype = {
constructor: GameState,
/* Deserialization */
__reinit__: function(env) {
this._game = env.game;
}
};
/* The DOM-based user interface of the game */
function GameUI(game) {
this.game = game;
this.root = null;
this.parent = null;
this._tabs = {};
this._tabButtons = {};
this._items = {};
}
GameUI.prototype = {
/* Produce the DOM tree corresponding to this object */
render: function() {
if (this.root == null) {
this.root = $makeNode("div", {id: "game-content"}, [
["div", "pane row-all", {id: "game-layers"}, [
["div", "layer selected row", [
["div", "col col-3of10 scroll-inset", [
["div", {id: "messagebar", lang: "en-US"}]
]],
["div", "col col-all", [
["div", "row row-small row-btn inset", {id: "tabbar"}],
["div", "row row-all pane", {id: "mainpane"}]
]]
]],
["div", "selectable layer text-popup shade", {id: "pausescreen"}, [
["h3", null, "Paused"]
]]
]],
["div", "row row-small inset hidden", {id: "bottombar"}, [
["button", "btn btn-small dim", {id: "credits-game"}, "Credits"],
["div", "col col-all"],
["button", "btn btn-small", {id: "pause-game"}, "Pause"],
["hr"],
["button", "btn btn-small", {id: "exit-game",
title: "Save game and exit"}, "Exit"]
]]
]);
$listen($idx("pause-game", this.root), "click", function() {
this.game.pause();
}.bind(this));
$listen($idx("exit-game", this.root), "click", function() {
this.game.exit();
showNode("titlescreen");
}.bind(this));
$listen($idx("credits-game", this.root), "click", function() {
this.game.pause(true);
showNode("creditscreen");
}.bind(this));
var state = this.game.state;
if (state.messages.length) {
var m = state.messages;
for (var i = 0; i < m.length; i++)
this._showMessage(m[i]);
}
for (var key in state.tabs) {
if (! state.tabs.hasOwnProperty(key)) continue;
this._addTab(key, state.tabs[key].name, state.tabs[key]);
}
var curTab = this.game.state.currentTab;
if (curTab) {
this._updateItems(curTab, "items");
this._updateItems(curTab, "gauges");
this._showTab(curTab, this.game.state.tabs[curTab].hidden);
}
if (this.game.getFlag('controlsVisible')) {
$idx("bottombar", this.root).classList.remove("hidden");
}
this._updatePause();
}
return this.root;
},
/* Perform additional adjustments that must happen when the root node is in
* the DOM */
_postRender: function() {
var msgbar = $idx("messagebar", this.root);
msgbar.scrollTop = msgbar.scrollHeight;
},
/* Embed the game's UI into the given DOM node
*
* If not already done, the UI is constructed. */
mount: function(parent) {
this.parent = parent;
parent.appendChild(this.render());
this._postRender();
return this.root;
},
/* Remove the game's UI from the given DOM node */
unmount: function() {
if (! this.root || ! this.parent) return;
var oldParent = this.parent;
this.parent.removeChild(this.root);
this.parent = null;
return oldParent;
},
/* Reveal the game controls */
showControls: function() {
var bar = $idx("bottombar", this.root);
this.game.setFlag('controlsVisible');
bar.classList.remove("hidden");
},
/* Message showing backend */
_showMessage: function(text) {
var msgnode = $makeNode("p", "log-message", [text]);
var msgbar = $idx("messagebar", this.root);
msgbar.appendChild(msgnode);
msgbar.scrollTop = msgbar.scrollHeight;
},
/* Add a UI tab */
_addTab: function(name, dispname, options) {
if (! options) options = {};
this._tabButtons[name] = $makeNode("button",
"btn btn-small fade-in", {id: "tabbtn-" + name}, [dispname]);
$listen(this._tabButtons[name], "click", function() {
this.game.showTab(name);
}.bind(this));
var tabbar = $idx("tabbar", this.root);
if (! options.hidden && ! tabbar.contains(this._tabButtons[name])) {
$idx("tabbar", this.root).appendChild(this._tabButtons[name]);
this._sortTabs();
}
this._tabs[name] = $makeNode("div", "selectable layer inset game-tab col",
{id: "tab-" + name}, [
["div", "items row-all"],
["div", "gauges row row-wrap"]
]);
$idx("mainpane", this.root).appendChild(this._tabs[name]);
},
/* Show a UI tab */
_showTab: function(name, hidden) {
function suppressAnimation(node) {
$replaceClass(node, "fade-in", "fade-in-suppressed");
}
var tabbtn = this._tabButtons[name];
var tabbar = $idx("tabbar", this.root);
if (! hidden && ! tabbar.contains(tabbtn)) {
tabbar.appendChild(tabbtn);
this._sortTabs();
}
Array.prototype.forEach.call($selAll("#tab-" + name + " > * > *",
this.root), suppressAnimation);
showNode(this._tabs[name]);
},
/* Ensure the UI tab buttons are in the correct order */
_sortTabs: function() {
var indices = {}, order = this.game.state.tabOrder;
for (var i = 0; i < order.length; i++)
indices[order[i]] = i + 1;
var last = order.length + 1;
var tabbar = $idx("tabbar", this.root);
var nodes = Array.prototype.slice.call(tabbar.children);
nodes.sort(function(a, b) {
var ka = indices[a.id.replace(/^tabbtn-/, "")] || last;
var kb = indices[b.id.replace(/^tabbtn-/, "")] || last;
return (ka < kb) ? -1 : (ka > kb) ? 1 : 0;
});
nodes.forEach(function(el) {
tabbar.appendChild(el);
});
},
/* Get the UI node of an item */
_getItem: function(name) {
if (! this._items.hasOwnProperty(name))
this._items[name] = this.game.state.items[name].render();
return this._items[name];
},
/* Show an item in a tab */
_showItem: function(tabname, name) {
if (tabname == this.game.state.currentTab)
$replaceClass(this._getItem(name), "fade-in-suppressed", "fade-in");
this._updateItems(tabname, "items");
},
/* Show a gauge in a tab */
_showGauge: function(tabname, name) {
if (tabname == this.game.state.currentTab)
$replaceClass(this._getItem(name), "fade-in-suppressed", "fade-in");
this._updateItems(tabname, "gauges");
},
/* Ensure all items are correctly present in a tab */
_updateItems: function(tabname, section) {
var container = $sel("#tab-" + tabname + " ." + section, this.root);
var order = this.game.state.tabs[tabname][section];
order = (order) ? order.slice() : [];
order.reverse();
var lastNode = null;
for (var i = 0; i < order.length; i++) {
var node = this._getItem(order[i]);
if (node.parentNode != container) {
container.insertBefore(node, lastNode);
}
while (node.nextElementSibling != lastNode) {
container.removeChild(node.nextElementSibling);
}
lastNode = node;
}
if (lastNode) {
while (lastNode.previousElementSibling)
container.removeChild(lastNode.previousElementSibling);
}
},
/* Remove the named item again */
_removeItem: function(name) {
var it = this._items[name];
if (it && it.parentNode) it.parentNode.removeChild(it);
delete this._items[name];
},
/* Update the text of the pause button */
_updatePause: function() {
var t = (this.game.paused) ? "Resume" : "Pause";
$idx("pause-game", this.root).textContent = t;
if (this.game.paused) {
showNode($idx("pausescreen", this.root));
} else {
hideChildren($idx("game-layers", this.root));
}
},
constructor: GameUI
};
/* An Item encapsulates a single object the player can interact with
*
* Item-s must be serializable; hence, non-serializable properties must be
* prefixed with underscores.
* Arguments after game and name are passed to the __init__ method (if any)
* variadically.
* The special method __remove__ is invoked with no arguments and the return
* value ignored when the item is being removed from the game; it should not
* be used thereafter. */
function Item(game, name) {
this._game = game;
this.name = name;
this._vars = {};
if (this.__init__)
this.__init__.apply(this, Array.prototype.slice.call(arguments, 2));
}
Item.prototype = {
/* Return the DOM node representing the UI of the item or null if none */
render: function() {
if (this._node === undefined && this._render)
this._node = this._render();
return this._node;
},
/* Use the item in some specific way */
use: function() {
/* NOP */
},
/* Return a wrapper around a method of this item */
_makeAction: function(method) {
return this._game.createTaskEx("state.items." + this.name + "." + method,
Array.prototype.slice.call(arguments, 1));
},
/* Create a Variable for this item */
_makeVariable: function(name, value, min, max) {
var ret = this._game.makeVariable(this.name + "/" + name, value,
min, max);
this._vars[name] = ret;
return ret;
},
/* Create a handler for a Variable tracking the value of another Variable */
_makeVariableHandler: function(name, factor) {
return this._game.makeVariableHandler(this.name + "/" + name, factor);
},
/* Retrieve a Variable on this item */
getVariable: function(name) {
if (! (name in this._vars)) {
this._vars[name] = this._game.getVariable(this.name + "/" + name);
}
return this._vars[name];
},
constructor: Item,
/* Deserialize an item */
__reinit__: function(env) {
this._game = env.game;
this._vars = {};
}
};
/* An item that can be activated and deactivated
*
* The use() method is specified to toggle the activity state (subtypes may
* override this); changing the activity triggers listeners. */
function ActiveItem(game, name) {
this.active = false;