/*
* Stage
* Visit http://createjs.com/ for documentation, updates and examples.
*
* Copyright (c) 2010 gskinner.com, inc.
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
(function(window) {
/**
* A stage is the root level Container for a display list. Each time its tick method is called, it will render its display
* list to its target canvas.
* @class Stage
* @extends Container
* @constructor
* @param {HTMLCanvasElement} canvas The canvas the stage will render to.
**/
var Stage = function(canvas) {
this.initialize(canvas);
}
var p = Stage.prototype = new Container();
// static properties:
/**
* @property _snapToPixelEnabled
* @protected
* @static
* @type Boolean
* @default false
**/
Stage._snapToPixelEnabled = false; // snapToPixelEnabled is temporarily copied here during a draw to provide global access.
// public properties:
/**
* Indicates whether the stage should automatically clear the canvas before each render. You can set this to false to manually
* control clearing (for generative art, or when pointing multiple stages at the same canvas for example).
* @property autoClear
* @type Boolean
* @default true
**/
p.autoClear = true;
/** The canvas the stage will render to. Multiple stages can share a single canvas, but you must disable autoClear for all but the
* first stage that will be ticked (or they will clear each other's render).
* @property canvas
* @type HTMLCanvasElement
**/
p.canvas = null;
/**
* READ-ONLY. The current mouse X position on the canvas. If the mouse leaves the canvas, this will indicate the most recent
* position over the canvas, and mouseInBounds will be set to false.
* @property mouseX
* @type Number
* @final
**/
p.mouseX = null;
/** READ-ONLY. The current mouse Y position on the canvas. If the mouse leaves the canvas, this will indicate the most recent
* position over the canvas, and mouseInBounds will be set to false.
* @property mouseY
* @type Number
* @final
**/
p.mouseY = null;
/** The onMouseMove callback is called when the user moves the mouse over the canvas. The handler is passed a single param
* containing the corresponding MouseEvent instance.
* @event onMouseMove
* @param {MouseEvent} event A MouseEvent instance with information about the current mouse event.
**/
p.onMouseMove = null;
/**
* The onMouseUp callback is called when the user releases the mouse button anywhere that the page can detect it. The handler
* is passed a single param containing the corresponding MouseEvent instance.
* @event onMouseUp
* @param {MouseEvent} event A MouseEvent instance with information about the current mouse event.
**/
p.onMouseUp = null;
/**
* The onMouseDown callback is called when the user presses the mouse button over the canvas. The handler is passed a single
* param containing the corresponding MouseEvent instance.
* @event onMouseDown
* @param {MouseEvent} event A MouseEvent instance with information about the current mouse event.
**/
p.onMouseDown = null;
/**
* Indicates whether this stage should use the snapToPixel property of display objects when rendering them.
* @property snapToPixelEnabled
* @type Boolean
* @default false
**/
p.snapToPixelEnabled = false;
/** Indicates whether the mouse is currently within the bounds of the canvas.
* @property mouseInBounds
* @type Boolean
* @default false
**/
p.mouseInBounds = false;
/** If false, tick callbacks will be called on all display objects on the stage prior to rendering to the canvas.
* @property tickOnUpdate
* @type Boolean
* @default false
**/
p.tickOnUpdate = true;
// private properties:
/**
* @property _activeMouseEvent
* @protected
* @type MouseEvent
**/
p._activeMouseEvent = null;
/**
* @property _activeMouseTarget
* @protected
* @type DisplayObject
**/
p._activeMouseTarget = null;
/**
* @property _mouseOverIntervalID
* @protected
* @type Number
**/
p._mouseOverIntervalID = null;
/**
* @property _mouseOverX
* @protected
* @type Number
**/
p._mouseOverX = 0;
/**
* @property _mouseOverY
* @protected
* @type Number
**/
p._mouseOverY = 0;
/**
* @property _mouseOverTarget
* @protected
* @type DisplayObject
**/
p._mouseOverTarget = null;
// constructor:
/**
* @property DisplayObject_initialize
* @type Function
* @private
**/
p.Container_initialize = p.initialize;
/**
* Initialization method.
* @method initialize
* param {HTMLCanvasElement} canvas A canvas object, or the string id of a canvas object in the current document.
* @protected
**/
p.initialize = function(canvas) {
this.Container_initialize();
this.canvas = (canvas instanceof HTMLCanvasElement) ? canvas : document.getElementById(canvas);
this._enableMouseEvents(true);
}
// public methods:
/**
* @event tick
* Broadcast to children when the stage is updated.
**/
/**
* Each time the update method is called, the stage will tick any descendants exposing a tick method (ex. BitmapAnimation)
* and render its entire display list to the canvas.
* @method update
**/
p.update = function(data) {
if (!this.canvas) { return; }
if (this.autoClear) { this.clear(); }
Stage._snapToPixelEnabled = this.snapToPixelEnabled;
if (this.tickOnUpdate) {
this._tick(data);
}
this.draw(this.canvas.getContext("2d"), false, this.getConcatenatedMatrix(this._matrix));
}
/**
* Calls the update method. Useful for adding stage as a listener to Ticker directly.
* @property tick
* @private
* @type Function
**/
p.tick = p.update;
/**
* Clears the target canvas. Useful if autoClear is set to false.
* @method clear
**/
p.clear = function() {
if (!this.canvas) { return; }
var ctx = this.canvas.getContext("2d");
ctx.setTransform(1, 0, 0, 1, 0, 0);
ctx.clearRect(0, 0, this.canvas.width, this.canvas.height);
}
/**
* Returns a data url that contains a Base64 encoded image of the contents of the stage. The returned data url can be
* specified as the src value of an image element.
* @method toDataURL
* @param {String} backgroundColor The background color to be used for the generated image. The value can be any value HTML color
* value, including HEX colors, rgb and rgba. The default value is a transparent background.
* @param {String} mimeType The MIME type of the image format to be create. The default is "image/png". If an unknown MIME type
* is passed in, or if the browser does not support the specified MIME type, the default value will be used.
* @return {String} a Base64 encoded image.
**/
p.toDataURL = function(backgroundColor, mimeType) {
if(!mimeType) {
mimeType = "image/png";
}
var ctx = this.canvas.getContext('2d');
var w = this.canvas.width;
var h = this.canvas.height;
var data;
if(backgroundColor) {
//get the current ImageData for the canvas.
data = ctx.getImageData(0, 0, w, h);
//store the current globalCompositeOperation
var compositeOperation = ctx.globalCompositeOperation;
//set to draw behind current content
ctx.globalCompositeOperation = "destination-over";
//set background color
ctx.fillStyle = backgroundColor;
//draw background on entire canvas
ctx.fillRect(0, 0, w, h);
}
//get the image data from the canvas
var dataURL = this.canvas.toDataURL(mimeType);
if(backgroundColor) {
//clear the canvas
ctx.clearRect (0, 0, w, h);
//restore it with original settings
ctx.putImageData(data, 0, 0);
//reset the globalCompositeOperation to what it was
ctx.globalCompositeOperation = compositeOperation;
}
return dataURL;
}
/**
* Enables or disables (by passing a frequency of 0) mouse over handlers (onMouseOver and onMouseOut) for this stage's display
* list. These events can be expensive to generate, so they are disabled by default, and the frequency of the events
* can be controlled independently of mouse move events via the optional frequency parameter.
* @method enableMouseOver
* @param {Number} frequency Optional param specifying the maximum number of times per second to broadcast mouse over/out events. Set to 0 to disable mouse
* over events completely. Maximum is 50. A lower frequency is less responsive, but uses less CPU. Default is 20.
**/
p.enableMouseOver = function(frequency) {
if (this._mouseOverIntervalID) {
clearInterval(this._mouseOverIntervalID);
this._mouseOverIntervalID = null;
}
if (frequency == null) { frequency = 20; }
else if (frequency <= 0) { return; }
var o = this;
this._mouseOverIntervalID = setInterval(function(){ o._testMouseOver(); }, 1000/Math.min(50,frequency));
this._mouseOverX = NaN;
this._mouseOverTarget = null;
}
/**
* Returns a clone of this Stage.
* @return {Stage} A clone of the current Container instance.
**/
p.clone = function() {
var o = new Stage(null);
this.cloneProps(o);
return o;
}
/**
* Returns a string representation of this object.
* @method toString
* @return {String} a string representation of the instance.
**/
p.toString = function() {
return "[Stage (name="+ this.name +")]";
}
// private methods:
/**
* @method _enableMouseEvents
* @protected
* @param {Boolean} enabled
**/
p._enableMouseEvents = function() {
var o = this;
var evtTarget = window.addEventListener ? window : document;
evtTarget.addEventListener("mouseup", function(e) { o._handleMouseUp(e); }, false);
evtTarget.addEventListener("mousemove", function(e) { o._handleMouseMove(e); }, false);
evtTarget.addEventListener("dblclick", function(e) { o._handleDoubleClick(e); }, false);
// this is to facilitate extending Stage:
if (this.canvas) { this.canvas.addEventListener("mousedown", function(e) { o._handleMouseDown(e); }, false); }
}
/**
* @method _handleMouseMove
* @protected
* @param {MouseEvent} e
**/
p._handleMouseMove = function(e) {
if (!this.canvas) {
this.mouseX = this.mouseY = null;
return;
}
if(!e){ e = window.event; }
var inBounds = this.mouseInBounds;
this._updateMousePosition(e.pageX, e.pageY);
if (!inBounds && !this.mouseInBounds) { return; }
var evt = new MouseEvent("onMouseMove", this.mouseX, this.mouseY, this, e);
if (this.onMouseMove) { this.onMouseMove(evt); }
if (this._activeMouseEvent && this._activeMouseEvent.onMouseMove) { this._activeMouseEvent.onMouseMove(evt); }
}
/**
* @method _updateMousePosition
* @protected
* @param {Number} pageX
* @param {Number} pageY
**/
p._updateMousePosition = function(pageX, pageY) {
var o = this.canvas;
do {
pageX -= o.offsetLeft;
pageY -= o.offsetTop;
} while (o = o.offsetParent);
this.mouseInBounds = (pageX >= 0 && pageY >= 0 && pageX < this.canvas.width && pageY < this.canvas.height);
if (this.mouseInBounds) {
this.mouseX = pageX;
this.mouseY = pageY;
}
}
/**
* @method _handleMouseUp
* @protected
* @param {MouseEvent} e
**/
p._handleMouseUp = function(e) {
var evt = new MouseEvent("onMouseUp", this.mouseX, this.mouseY, this, e);
if (this.onMouseUp) { this.onMouseUp(evt); }
if (this._activeMouseEvent && this._activeMouseEvent.onMouseUp) { this._activeMouseEvent.onMouseUp(evt); }
if (this._activeMouseTarget && this._activeMouseTarget.onClick &&
this._getObjectsUnderPoint(this.mouseX, this.mouseY, null, true, (this._mouseOverIntervalID ? 3 : 1)) == this._activeMouseTarget) {
this._activeMouseTarget.onClick(new MouseEvent("onClick", this.mouseX, this.mouseY, this._activeMouseTarget, e));
}
this._activeMouseEvent = this._activeMouseTarget = null;
}
/**
* @method _handleMouseDown
* @protected
* @param {MouseEvent} e
**/
p._handleMouseDown = function(e) {
if (this.onMouseDown) {
this.onMouseDown(new MouseEvent("onMouseDown", this.mouseX, this.mouseY, this, e));
}
var target = this._getObjectsUnderPoint(this.mouseX, this.mouseY, null, (this._mouseOverIntervalID ? 3 : 1));
if (target) {
if (target.onPress instanceof Function) {
var evt = new MouseEvent("onPress", this.mouseX, this.mouseY, target, e);
target.onPress(evt);
if (evt.onMouseMove || evt.onMouseUp) { this._activeMouseEvent = evt; }
}
this._activeMouseTarget = target;
}
}
/**
* @method _testMouseOver
* @protected
**/
p._testMouseOver = function() {
if (this.mouseX == this._mouseOverX && this.mouseY == this._mouseOverY && this.mouseInBounds) { return; }
var target = null;
if (this.mouseInBounds) {
target = this._getObjectsUnderPoint(this.mouseX, this.mouseY, null, 3);
this._mouseOverX = this.mouseX;
this._mouseOverY = this.mouseY;
}
if (this._mouseOverTarget != target) {
if (this._mouseOverTarget && this._mouseOverTarget.onMouseOut) {
this._mouseOverTarget.onMouseOut(new MouseEvent("onMouseOut", this.mouseX, this.mouseY, this._mouseOverTarget));
}
if (target && target.onMouseOver) {
target.onMouseOver(new MouseEvent("onMouseOver", this.mouseX, this.mouseY, target));
}
this._mouseOverTarget = target;
}
}
/**
* @method _handleDoubleClick
* @protected
* @param {MouseEvent} e
**/
p._handleDoubleClick = function(e) {
if (this.onDoubleClick) {
this.onDoubleClick(new MouseEvent("onDoubleClick", this.mouseX, this.mouseY, this, e));
}
var target = this._getObjectsUnderPoint(this.mouseX, this.mouseY, null, (this._mouseOverIntervalID ? 3 : 1));
if (target) {
if (target.onDoubleClick instanceof Function) {
target.onDoubleClick(new MouseEvent("onPress", this.mouseX, this.mouseY, target, e));
}
}
}
window.Stage = Stage;
}(window));