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js-vine.js
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js-vine.js
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/*
Copyright (C) 2011 by J. David Eisenberg
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>
*/
var novel_script;
/*
A Character is an actor that can speak and be displayed.
name: the name of the character
escName: the escape() version of name; used as an id="" attribute
color: text color for this character
image: an Image object containing the image to display
imageElement: an <img> element to go into the DOM
src: the current source attribute
prevSrc: previous source (in order to detect changes)
domRef: a reference to the <img> element once inserted into the DOM
position: where to display the character
prevPosition: last place displayed (in order to detect changes)
alpha: transparency (0 = transparent, 1.0 = opaque)
visibility: either "visible" or "hidden" (as in CSS)
*/
function Character(characterName)
{
this.name = characterName;
if (characterName == '')
{
characterName = "anon" + novel.anonymous++;
}
this.escName = escape(characterName);
this.color = "#000000";
this.image = new Image();
this.imageElement = document.createElement("img");
this.imageElement.setAttribute("id", this.escName);
this.src = null;
this.prevSrc = null;
this.avatar = "";
this.domRef = null;
this.position = new Position(0, 0, true);
this.prevPosition = new Position(0, 0, true);
this.alpha = 1.0;
this.visibility = "visible";
/*
If a second argument is given, it is an anonymous
object giving the initial image and position of this
character.
*/
if (arguments.length > 1)
{
var obj = arguments[1];
this.color = obj.color || this.color;
if (obj.image)
{
this.image.setAttribute("src", novel.imagePath +
obj.image.replace(/{{(.*?)}}/g, novel_interpolator));
}
this.position = obj.position || new Position(0, 0, true);
}
}
/*
If the <img> for this character isn't already in the DOM,
add it to the tableau, and push it into the novel's array
of actors that are on the screen.
*/
Character.prototype.display = function(param)
{
var closure = this;
var displayImage = true;
/*
If the parameter is an object, set the character's properties
to the properties given in the parameter
*/
if (param && param.constructor == Object)
{
for (var property in param)
{
if (property == "image")
{
if (param.image != null)
{
this.image.src = novel.imagePath +
param.image.replace(/{{(.*?)}}/g, novel_interpolator);
}
else
{
displayImage = false;
}
}
else if (property != "say")
{
this[property] = param[property];
}
}
}
/*
The image's width and height don't get set immediately if the
image isn't cached, so wait 30 milliseconds to finish the display.
*/
novel.paused = true;
// novel.frame -= 2; // playNovel will increment this...
setTimeout( function() { return closure.finishDisplay.apply( closure, [param, displayImage] ); }, 30 );
}
Character.prototype.finishDisplay = function(param, displayImage)
{
if (this.image.complete)
{
/*
Has width, height, or position changed?
If so, hide this character.
*/
var pos = this.position;
var el = this.domRef;
var xPos = pos.x;
var yPos = pos.y;
var changed = false;
if (this.domRef == null)
{
this.imageElement.style.visibility = 'hidden';
novel.tableau.appendChild(this.imageElement);
novel.actors.push(this);
this.domRef = document.getElementById(this.escName);
el = this.domRef;
changed = true;
}
else
{
changed = (!pos.equals(this.prevPosition) ||
this.image.width != this.domRef.width ||
this.image.height != this.domRef.height)
}
el.src = this.image.src; // load in the new picture
if (changed && displayImage)
{
/*
Then set its position, visiblity, and transparency
*/
if (pos.xRelative)
{
xPos *= novel.width;
}
if (pos.yRelative)
{
yPos *= novel.height;
}
novel.waitCount = 0;
xPos -= Math.floor(pos.xAnchor * this.image.width);
yPos -= Math.floor(pos.yAnchor * this.image.height);
el.style.position = "absolute";
el.style.left = xPos + "px";
el.style.top = yPos + "px";
el.style.visibility = this.visibility;
this.prevPosition = this.position.clone();
}
if (displayImage)
{
novel_setAlpha(this.domRef, this.alpha);
}
if (param && param.say)
{
this.say(param.say);
if (param.noPause)
{
playNovel();
}
}
else
{
playNovel();
}
}
else
{
/* Image isn't loaded yet; try again in 30 milliseconds */
novel.waitCount++;
var closure = this;
setTimeout( function() {
return closure.finishDisplay.apply( closure, [param, displayImage] );
}, 30 );
}
}
/*
A convenience method; parameter is either true or false
to show or hide a character
*/
Character.prototype.show = function(visible)
{
if (this.domRef)
{
this.domRef.style.visibility = (visible) ? "visible" : "hidden";
}
}
/*
Set the transparency. If the picture is completely opaque,
we must remove the style information, as IE blurs the picture
even when alpha is 100.
*/
Character.prototype.setAlpha = function(alpha)
{
novel_setAlpha(this, alpha);
}
/*
Show the character' name (if any) and the
given string in the <div id="dialog"> area.
Anything in {{ }} is interpolated.
*/
Character.prototype.say = function(str)
{
var htmlStr = "";
var interpolatedString = str;
clearDialog();
if (this.avatar != "")
{
htmlStr += '<img src="' +
novel.imagePath +
this.avatar.replace(/{{(.*?)}}/g, novel_interpolator) +
'" class="avatar"/>';
}
if (this.name != "")
{
htmlStr += '<span style="color: ' + this.color + '">' +
this.name + ':</span><br />';
}
if (str.indexOf("{{") >= 0)
{
str = str.replace(/{{(.*?)}}/g, novel_interpolator);
}
htmlStr += str;
novel.dialog.innerHTML = htmlStr;
novel.paused = true;
// novel.paused = (arguments.length == 1) ? true : (!arguments[1]);
}
/*
The novel tells the characters to do some action. If
the parameter is a string, then the character is speaking;
if it's an object, then the character is being displayed.
*/
Character.prototype.doAction = function(param)
{
if (param == null || param == "" || param.constructor == Object)
{
this.display(param);
}
else if (param.constructor == String)
{
this.say(param);
}
}
/* ============================================== */
/*
A TextBlock is a block of text that can be displayed.
name: the name for this text block
escName: the escape() of the name; used as an id="" attribute
color: text color for this block
backgroundColor: background color for this block
div: a <div class="textClass"> element that holds the text
domRef: a reference to the <div> once inserted into the DOM
position: where to display this text block
align: text alignment, as in CSS
border: a border specification as in CSS
font: the font to use to display the text
width: % of width of the window; range from 0 to 1.0
visibility: "visible" or "hidden", as in CSS
text: actually, an HTML string to display inside the text area
*/
function TextBlock(textName)
{
if (textName == '')
{
textName = "anon" + novel.anonymous++;
}
this.escName = escape(textName);
this.color = "#000000";
this.div = document.createElement("div");
this.div.setAttribute("id", this.escName);
this.div.setAttribute("class", "textClass");
this.div.setAttribute("className", "textClass");
this.domRef = null;
this.position = new Position(0, 0, true);
this.align = "left";
this.font = '20px "Deja Vu Sans", Helvetica, Arial, sans-serif';
this.width = 1.0; // decimal percentage
this.visibility = "visible";
this.text = "";
/*
If given a second parameter, use its fields
to set the TextBlock's fields
*/
if (arguments.length > 1)
{
var param = arguments[1];
for (var property in param)
{
this[property] = param[property];
}
}
}
/*
Convenience method to set the HTML within a text block
*/
TextBlock.prototype.setText = function(html)
{
this.domRef.innerHTML = html;
}
/*
Set the transparency. If the picture is completely opaque,
we must remove the style information, as IE blurs the picture
even when alpha is 100.
*/
TextBlock.prototype.setAlpha = function(alpha)
{
novel_setAlpha(this, alpha);
}
/*
Display the text block on the screen
*/
TextBlock.prototype.display = function(param)
{
/*
If the <div> isn't in the DOM yet, insert it,
and add it to the list of actors in the tableau.
*/
if (this.domRef == null)
{
novel.tableau.appendChild(this.div);
novel.actors.push(this);
}
this.domRef = document.getElementById(this.escName);
novel_textEntity_display(this, param);
}
function novel_textEntity_display(obj, param)
{
/*
Hide the text, then look at the parameter and take
appropriate action depending upon its type
*/
var el = obj.domRef;
var xPos;
var yPos;
el.style.visibility = "hidden";
if (param != null)
{
if (param.constructor == Position)
{
obj.position = param;
}
else if (param.constructor == String)
{
obj.text = param;
}
else if (param.constructor == Object)
{
for (var propertyName in param)
{
obj[propertyName] = param[propertyName];
}
}
}
// set the text
el.innerHTML = obj.text.replace(/{{(.*?)}}/g,
novel_interpolator);
xPos = obj.position.x;
yPos = obj.position.y;
// and its position and attributes
if (obj.position.xRelative)
{
xPos *= novel.width;
}
if (obj.position.yRelative)
{
yPos *= novel.height;
}
if (obj.color)
{
el.style.color = obj.color;
}
if (obj.backgroundColor)
{
el.style.backgroundColor = obj.backgroundColor;
}
if (obj.font)
{
el.style.font = obj.font;
}
if (obj.border)
{
el.style.border = obj.border;
}
if (obj.padding)
{
el.style.padding = obj.padding;
}
if (obj.align)
{
el.style.textAlign = obj.align;
}
if (!obj.visibility)
{
obj.visibility = "visible";
}
el.style.position = "absolute";
el.style.width = Math.floor(obj.width * 100) + "%";
el.style.left = xPos + "px";
el.style.top = yPos + "px";
el.style.visibility = obj.visibility; // then reveal (if visible)
}
/*
A convenience method; parameter is either true or false
to show or hide a text block
*/
TextBlock.prototype.show = function(visible)
{
if (this.domRef)
{
this.domRef.style.visibility = (visible) ? "visible" : "hidden";
}
}
/*
At this moment, the only action a text block can
take is to display itself.
*/
TextBlock.prototype.doAction = function(param)
{
this.display(param);
}
/*
A Input is a block of text that can be displayed.
name: the name for this text block
escName: the escape() of the name; used as an id="" attribute
color: text color for this block
backgroundColor: background color for this block
inputElement: a <input type="text" class="textClass"> element that holds the text
domRef: a reference to the <div> once inserted into the DOM
position: where to display this text block
align: text alignment, as in CSS
border: a border specification as in CSS
font: the font to use to display the text
width: % of width of the window; range from 0 to 1.0
visibility: "visible" or "hidden", as in CSS
text: initial value of text field
*/
function Input(textName)
{
if (textName == '')
{
textName = "anon" + novel.anonymous++;
}
this.escName = escape(textName);
this.color = "#000000";
this.inputElement = document.createElement("input");
this.inputElement.setAttribute("type", "text");
this.inputElement.setAttribute("id", this.escName);
this.inputElement.setAttribute("class", "textClass");
this.inputElement.setAttribute("className", "textClass");
if (this.inputElement.addEventListener)
{
this.inputElement.addEventListener("change", novel_inputChange, false);
}
else
{
this.inputElement.attachEvent("onchange", novel_inputChange);
}
this.domRef = null;
this.position = new Position(0, 0, true);
this.align = "left";
this.font = '20px "Deja Vu Sans", Helvetica, Arial, sans-serif';
this.width = 1.0; // decimal percentage
this.visibility = "visible";
this.text = "";
/*
If given a second parameter, use its fields
to set the Input's fields
*/
if (arguments.length > 1)
{
var param = arguments[1];
for (var property in param)
{
this[property] = param[property];
}
}
}
/*
Convenience method to set the initial value of the input field
*/
Input.prototype.setValue = function(txt)
{
this.domRef.value = txt;
}
/*
Set the transparency.
*/
Input.prototype.setAlpha = function(alpha)
{
novel_setAlpha(this, alpha);
}
/*
Display the text block on the screen
*/
Input.prototype.display = function(param)
{
/*
If the <input> isn't in the DOM yet, insert it,
and add it to the list of actors in the tableau.
*/
if (this.domRef == null)
{
novel.tableau.appendChild(this.inputElement);
novel.actors.push(this);
}
this.domRef = document.getElementById(this.escName);
this.domRef.value = this.text;
this.domRef.focus();
novel_textEntity_display(this, param);
novel.paused = true;
novel.ignoreClicks = true;
}
/*
A convenience method; parameter is either true or false
to show or hide a text block
*/
Input.prototype.show = function(visible)
{
this.domRef.style.visibility = (visible) ? "visible" : "hidden";
}
/*
At this moment, the only action a text block can
take is to display itself.
*/
Input.prototype.doAction = function(param)
{
this.display(param);
}
function novel_inputChange(evt)
{
var inputObj;
var str;
var actor;
if (!evt)
{
evt = window.event;
}
inputObj = evt.target;
str = inputObj.value;
str = str.replace(/&/g, '&');
str = str.replace(/</g, '<');
str = str.replace(/>/g, '>');
novel.userVar[inputObj.id] = str;
evt.cancelBubble = true;
if (evt.stopPropagation)
{
evt.stopPropagation();
}
novel.ignoreClicks = false;
actor = novel.actors.pop();
inputObj = actor.domRef;
if (inputObj != null)
{
inputObj.parentNode.removeChild(inputObj);
}
actor.domRef = null;
playNovel();
}
/* ============================================== */
/*
A MenuItem is an actor, but unlike a Character
or a TextBlock, it doesn't have methods; instead,
the menu function handles everything associated
with menus.
*/
function MenuItem(n, text, label)
{
this.domRef = document.createElement("div");
this.domRef.setAttribute("id", "menuItem" + n);
this.domRef.setAttribute("class", "menuItem");
this.domRef.setAttribute("className", "menuItem");
this.text = text;
this.label = label;
}
/* ============================================== */
/*
A Position specifies an item's screen position
(x, y); whether the coordinates are absolute (pixels)
or relative (decimal percent in range 0-1.0).
xAnchor and yAnchor are used to offset the "top left"
point of an image.
Presume an image that is 200 x 150 would ordinarily
be displayed with its upper left corner at (300, 400).
If xAnchor is .2 and yAnchor is .5, then the image
will display at the upper left coordinate
of (300 - (200 * .2), 400 - (150 * .5)), or (260, 325).
*/
function Position(x, y)
{
this.x = x
this.y = y
this.xRelative = (x <= 1.0);
this.yRelative = (y <= 1.0);
this.xAnchor = (arguments.length >= 3) ? arguments[2] : 0;
this.yAnchor = (arguments.length >= 4) ? arguments[3] : 0;
}
/*
Compare two Position objects for equality; returns
true or false
*/
Position.prototype.equals = function(other)
{
return (this.x == other.x && this.y == other.y &&
this.relative == other.relative &&
this.xAnchor == other.xAnchor && this.yAnchor == other.yAnchor);
}
/*
Creates a duplicate of a Position; needed to make sure
that the current and previous positions of a Character
are two separate objects.
*/
Position.prototype.clone = function()
{
var newPos = new Position(this.x, this.y, this.relative);
newPos.xAnchor = this.xAnchor;
newPos.yAnchor = this.yAnchor;
return newPos;
}
/* =========================================================== */
/*
These are the functions for driving the novel.
Even though there is only one novel, I create an object for it
to avoid polluting the variables namespace. Further than it
already is polluted, that is.
frame: the current frame that is onscreen
tableau: the <div id="novel"> (Name comes from card games)
dialog: the <div id="dialog"> where characters "speak"
audio: the <div id="audio"> (if any, for music)
audioLoop: a boolean telling whether audio is looped or not
paused: awaiting a click. We need this because JavaScript can't
wait() or sleep().
history: keeps track of path through novel (not used yet)
historyPos: position in history (not used yet)
ignoreClicks: is a menu or input on screen? (If so, ignore clicks in tableau/dialog)
labels: associative array of all labels defined in the script
subs: associative array of all subroutines defined in the script
callStack: keep track of call statements (to "subroutines" in script)
anonymous: how many un-named text blocks or actors have we created?
actors: the list of characters and textblocks currently in the tableau
userVar: "variables" defined in the script (associative array)
scriptStack: current script stack; used in menus
ifStack: keeps track of whether you are in then or else part of nested if
backgroundImage: background image array; in order to fade/dissolve
background, it has to be an image rather than a background CSS style
pendingBackgroundImage: this is the background image that is waiting to load
activeBG: which background is active (0 or 1)?
bgAlpha: the transparency of the backgroundImage (0=transparent, 1=opaque)
waitCount: # of times waiting to complete picture loading (used for
debugging)
pauseTimer: a timer for the pause command
mappedImage: which image (if any) has an imageMap attached to it
lastClick: used to ensure at least 1/4 second between clicks
*/
function Novel() {
this.frame = 0;
this.tableau = null;
this.dialog = null;
this.audio = null;
this.audioLoop = false;
this.paused = false;
this.history = new Array();
this.historyPos = 0;
this.ignoreClicks = false;
this.labels = new Array();
this.subs = new Array();
this.callStack = new Array();
this.anonymous = 0;
this.actors = new Array(); // who is on screen right now?
this.userVar = new Object();
this.ifLevel = 0;
this.ifStack = new Array();
this.scriptStack = new Array();
this.backgroundImage = new Array(2);
this.pendingBackgroundImage;
this.activeBG = 0;
this.bgAlpha = 1.0;
this.waitCount = 0;
this.pauseTimer = null;
this.mappedImage = null;
this.lastClick = new Date().getTime();
}
/*
In order to avoid binding problems with "this",
the remaining functions are globals. Functions that
the scripts call directly aren't prefixed; functions
that are internal begin with novel_, again to avoid
polluting the namespace. Further.
*/
/*
This method interpolates {{...}} expressions
in strings.
*/
function novel_interpolator(str, p1, offset, s)
{
return eval(p1);
}
/*
Remove all menu items from the tableau
*/
function novel_clearMenuItems()
{
var actor;
var domObject;
var i;
if (novel)
{
i = 0;
while (i < novel.actors.length)
{
if (novel.actors[i].constructor == MenuItem)
{
domObject = novel.actors[i].domRef;
if (domObject != null)
{
domObject.parentNode.removeChild(domObject);
}
novel.actors[i].domRef = null;
novel.actors.splice(i, 1);
}
else
{
i++;
}
}
}
}
/*
When user clicks a menu item, it invokes the novel_menuJump
function. This function attaches the appropriate onclick.
*/
function novel_addOnClick(el, value)
{
el.onclick = function(e) { novel_menuJump.apply(window, [value, e]); return false;};
}
/*
Handle a click on a menu item. Stop event propagation
so that the tableau doesn't intercept the event.
Set novel_script to the menu's script, and the frame
to the first command in that script. Then
start playing the novel.
*/
function novel_menuJump(menuScript, evt)
{
if (!evt)
{
evt = window.event;
}
evt.cancelBubble = true;
if (evt.stopPropagation)
{
evt.stopPropagation();
}
novel_clearMenuItems();
novel.dialog.style.textAlign = "left";
novel.ignoreClicks = false;
novel_pushScript();
novel_script = menuScript;
novel.frame = 0;
playNovel();
}
/*
Fade out the background image by decreasing
its alpha by 10% every 0.1 seconds. When totally
transparent, swap to the new background image source,
and start fading in.
*/
function novel_fadeBgOut(targetAlpha)
{
var bg = document.getElementById("background" + novel.activeBG);
novel.bgAlpha -= 0.1;
bg.style.filter = "alpha(opacity=" + Math.floor(novel.bgAlpha*100) + ")";
bg.style.opacity = novel.bgAlpha;
if (novel.bgAlpha > 0)
{
setTimeout("novel_fadeBgOut(" + targetAlpha + ")", 100);
}
else
{
bg.src = novel.imagePath + novel.backgroundImage[novel.activeBG];
novel.pendingBackgroundImage = bg;
novel.paused = true;
setTimeout('novel_finishLoadingBackground("fade", ' + targetAlpha + ')', 30);
}
}
/*
Fade in the background image by increasing
its alpha by 10% every 0.1 seconds. When totally
opaque, restart playing the novel.
*/
function novel_fadeBgIn(targetAlpha)
{
var bg = document.getElementById("background" + novel.activeBG);
novel.bgAlpha += 0.1;
if (novel.bgAlpha < targetAlpha)
{
bg.style.filter = "alpha(opacity=" +
Math.floor(novel.bgAlpha*100) + ")";
bg.style.opacity = novel.bgAlpha;
setTimeout("novel_fadeBgIn(" + targetAlpha + ")", 100);
}
else
{
novel_setAlpha(bg, targetAlpha);
novel.bgAlpha = targetAlpha;
playNovel();
}
}
/*
Dissolve between background images by altering each one's
alpha by 10% every 0.1 seconds. When one is totally
transparent, the other will be totally opaque.
*/
function novel_dissolveIn(targetAlpha, n)
{
var bgA = document.getElementById("background" + novel.activeBG);
var bgB = document.getElementById("background" + (1 - novel.activeBG));
n++;
novel_setAlpha(bgA, novel.bgAlpha * (10 - n) / 10);
novel_setAlpha(bgB, targetAlpha * n / 10);
if (n < 10)
{
setTimeout("novel_dissolveIn(" + targetAlpha + "," + n + ")", 100);
}
else
{
novel_setAlpha(bgA, 0);
novel_setAlpha(bgB, targetAlpha);
novel.activeBG = 1 - novel.activeBG;
novel.bgAlpha = targetAlpha;
playNovel();
}
}
/*
Create the associative array of the labels and
their frame numbers in the main script. Only the
main script labels are scanned; labels in
menus or if statements are ignored.
*/
function novel_collectLabels()
{
for (var i = 0; i < novel_script.length; i += 2)
{
if (novel_script[i] == label)
{
novel.labels[novel_script[i + 1]] = i;
}
else if (novel_script[i] == sub)
{
novel.subs[novel_script[i+1]] = i;
}
}
}
/*
Save a reference to the script array
and the frame
*/
function novel_pushScript()
{
novel.scriptStack.push(novel_script);
novel.scriptStack.push(novel.frame);
}
/*
Restore the script array and frame.
*/
function novel_popScript()
{
if (novel.scriptStack.length > 0)
{
novel.frame = novel.scriptStack.pop() + 2;
novel_script = novel.scriptStack.pop();
}
}
/*
Set the transparency. If the picture is completely opaque,
we must remove the style information, as IE blurs the picture
even when alpha is 100.
*/
function novel_setAlpha(domRef, alpha)
{
if (alpha != 1.0)
{
domRef.style.filter = "alpha(opacity=" +
Math.floor(alpha*100) + ")";
domRef.style.opacity = alpha;
}
else
{
domRef.style.filter = null;
domRef.style.opacity = null;
}
}
function novel_handleClick(evt)
{
var now = new Date().getTime();
var ok;
if (!evt)
{
evt = window.event;
}
evt.cancelBubble = true;
if (evt.stopPropagation)
{
evt.stopPropagation();
}
/*
Don't allow two clicks within 1/4 second of each other
*/
ok = (now - novel.lastClick > 250);
novel.lastClick = now;
if (ok)
{
playNovel();
}
}
function novel_disableSelection(target)
{
if (target.onselectstart)
{
target.onselectstart = function() {return false;}; // IE