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<div id="main">
<h1 class="page-title">Source: src/pixi/display/DisplayObject.js</h1>
<section>
<article>
<pre class="sunlight-highlight-javascript linenums">/**
* @author Mat Groves http://matgroves.com/ @Doormat23
*/
/**
* The base class for all objects that are rendered on the screen.
* This is an abstract class and should not be used on its own rather it should be extended.
*
* @class DisplayObject
* @constructor
*/
PIXI.DisplayObject = function()
{
/**
* The coordinate of the object relative to the local coordinates of the parent.
*
* @property position
* @type Point
*/
this.position = new PIXI.Point(0, 0);
/**
* The scale factor of the object.
*
* @property scale
* @type Point
*/
this.scale = new PIXI.Point(1, 1);
/**
* The pivot point of the displayObject that it rotates around
*
* @property pivot
* @type Point
*/
this.pivot = new PIXI.Point(0, 0);
/**
* The rotation of the object in radians.
*
* @property rotation
* @type Number
*/
this.rotation = 0;
/**
* The opacity of the object.
*
* @property alpha
* @type Number
*/
this.alpha = 1;
/**
* The visibility of the object.
*
* @property visible
* @type Boolean
*/
this.visible = true;
/**
* This is the defined area that will pick up mouse / touch events. It is null by default.
* Setting it is a neat way of optimising the hitTest function that the interactionManager will use (as it will not need to hit test all the children)
*
* @property hitArea
* @type Rectangle|Circle|Ellipse|Polygon
*/
this.hitArea = null;
/**
* Can this object be rendered
*
* @property renderable
* @type Boolean
*/
this.renderable = false;
/**
* [read-only] The display object container that contains this display object.
*
* @property parent
* @type DisplayObjectContainer
* @readOnly
*/
this.parent = null;
/**
* [read-only] The stage the display object is connected to, or undefined if it is not connected to the stage.
*
* @property stage
* @type Stage
* @readOnly
*/
this.stage = null;
/**
* [read-only] The multiplied alpha of the displayObject
*
* @property worldAlpha
* @type Number
* @readOnly
*/
this.worldAlpha = 1;
/**
* [read-only] Current transform of the object based on world (parent) factors
*
* @property worldTransform
* @type Matrix
* @readOnly
* @private
*/
this.worldTransform = new PIXI.Matrix();
/**
* The position of the Display Object based on the world transform.
* This value is updated at the end of updateTransform and takes all parent transforms into account.
*
* @property worldPosition
* @type Point
* @readOnly
*/
this.worldPosition = new PIXI.Point(0, 0);
/**
* The scale of the Display Object based on the world transform.
* This value is updated at the end of updateTransform and takes all parent transforms into account.
*
* @property worldScale
* @type Point
* @readOnly
*/
this.worldScale = new PIXI.Point(1, 1);
/**
* The rotation of the Display Object, in radians, based on the world transform.
* This value is updated at the end of updateTransform and takes all parent transforms into account.
*
* @property worldRotation
* @type Number
* @readOnly
*/
this.worldRotation = 0;
/**
* cached sin rotation and cos rotation
*
* @property _sr
* @type Number
* @private
*/
this._sr = 0;
/**
* cached sin rotation and cos rotation
*
* @property _cr
* @type Number
* @private
*/
this._cr = 1;
/**
* The area the filter is applied to like the hitArea this is used as more of an optimisation
* rather than figuring out the dimensions of the displayObject each frame you can set this rectangle
*
* @property filterArea
* @type Rectangle
*/
this.filterArea = null;
/**
* The original, cached bounds of the object
*
* @property _bounds
* @type Rectangle
* @private
*/
this._bounds = new PIXI.Rectangle(0, 0, 1, 1);
/**
* The most up-to-date bounds of the object
*
* @property _currentBounds
* @type Rectangle
* @private
*/
this._currentBounds = null;
/**
* The original, cached mask of the object
*
* @property _mask
* @type Rectangle
* @private
*/
this._mask = null;
/**
* Cached internal flag.
*
* @property _cacheAsBitmap
* @type Boolean
* @private
*/
this._cacheAsBitmap = false;
/**
* Cached internal flag.
*
* @property _cacheIsDirty
* @type Boolean
* @private
*/
this._cacheIsDirty = false;
};
// constructor
PIXI.DisplayObject.prototype.constructor = PIXI.DisplayObject;
/**
* Destroy this DisplayObject.
* Removes all references to transformCallbacks, its parent, the stage, filters, bounds, mask and cached Sprites.
*
* @method destroy
*/
PIXI.DisplayObject.prototype.destroy = function()
{
if (this.children)
{
var i = this.children.length;
while (i--)
{
this.children[i].destroy();
}
this.children = [];
}
this.hitArea = null;
this.parent = null;
this.stage = null;
this.worldTransform = null;
this.filterArea = null;
this._bounds = null;
this._currentBounds = null;
this._mask = null;
// In case Pixi is still going to try and render it even though destroyed
this.renderable = false;
this._destroyCachedSprite();
};
/**
* [read-only] Indicates if the sprite is globally visible.
*
* @property worldVisible
* @type Boolean
*/
Object.defineProperty(PIXI.DisplayObject.prototype, 'worldVisible', {
get: function() {
var item = this;
do
{
if (!item.visible) return false;
item = item.parent;
}
while(item);
return true;
}
});
/**
* Sets a mask for the displayObject. A mask is an object that limits the visibility of an object to the shape of the mask applied to it.
* In PIXI a regular mask must be a PIXI.Graphics object. This allows for much faster masking in canvas as it utilises shape clipping.
* To remove a mask, set this property to null.
*
* @property mask
* @type Graphics
*/
Object.defineProperty(PIXI.DisplayObject.prototype, 'mask', {
get: function() {
return this._mask;
},
set: function(value) {
if (this._mask) this._mask.isMask = false;
this._mask = value;
if (this._mask) this._mask.isMask = true;
}
});
/**
* Sets the filters for the displayObject.
* IMPORTANT: This is a webGL only feature and will be ignored by the Canvas renderer.
*
* To remove filters simply set this property to 'null'.
*
* You cannot have a filter and a multiply blend mode active at the same time. Setting a filter will reset
* this objects blend mode to NORMAL.
*
* @property filters
* @type Array(Filter)
*/
Object.defineProperty(PIXI.DisplayObject.prototype, 'filters', {
get: function() {
return this._filters;
},
set: function(value) {
if (value)
{
// now put all the passes in one place..
var passes = [];
for (var i = 0; i < value.length; i++)
{
var filterPasses = value[i].passes;
for (var j = 0; j < filterPasses.length; j++)
{
passes.push(filterPasses[j]);
}
}
// TODO change this as it is legacy
this._filterBlock = { target: this, filterPasses: passes };
}
this._filters = value;
if (this.blendMode && this.blendMode === PIXI.blendModes.MULTIPLY)
{
this.blendMode = PIXI.blendModes.NORMAL;
}
}
});
/**
* Set if this display object is cached as a bitmap.
* This basically takes a snap shot of the display object as it is at that moment. It can provide a performance benefit for complex static displayObjects.
* To remove simply set this property to 'null'
* @property cacheAsBitmap
* @type Boolean
*/
Object.defineProperty(PIXI.DisplayObject.prototype, 'cacheAsBitmap', {
get: function() {
return this._cacheAsBitmap;
},
set: function(value) {
if (this._cacheAsBitmap === value)
{
return;
}
if (value)
{
this._generateCachedSprite();
}
else
{
this._destroyCachedSprite();
}
this._cacheAsBitmap = value;
}
});
/*
* Updates the object transform for rendering.
*
* If the object has no parent, and no parent parameter is provided, it will default to Phaser.Game.World as the parent.
* If that is unavailable the transform fails to take place.
*
* The `parent` parameter has priority over the actual parent. Use it as a parent override.
* Setting it does **not** change the actual parent of this DisplayObject, it just uses the parent for the transform update.
*
* @method updateTransform
* @param {DisplayObject} [parent] - Optional parent to parent this DisplayObject transform from.
*/
PIXI.DisplayObject.prototype.updateTransform = function(parent)
{
if (!parent && !this.parent && !this.game)
{
return;
}
var p = this.parent;
if (parent)
{
p = parent;
}
else if (!this.parent)
{
p = this.game.world;
}
// create some matrix refs for easy access
var pt = p.worldTransform;
var wt = this.worldTransform;
// temporary matrix variables
var a, b, c, d, tx, ty;
// so if rotation is between 0 then we can simplify the multiplication process..
if (this.rotation % PIXI.PI_2)
{
// check to see if the rotation is the same as the previous render. This means we only need to use sin and cos when rotation actually changes
if (this.rotation !== this.rotationCache)
{
this.rotationCache = this.rotation;
this._sr = Math.sin(this.rotation);
this._cr = Math.cos(this.rotation);
}
// get the matrix values of the displayobject based on its transform properties..
a = this._cr * this.scale.x;
b = this._sr * this.scale.x;
c = -this._sr * this.scale.y;
d = this._cr * this.scale.y;
tx = this.position.x;
ty = this.position.y;
// check for pivot.. not often used so geared towards that fact!
if (this.pivot.x || this.pivot.y)
{
tx -= this.pivot.x * a + this.pivot.y * c;
ty -= this.pivot.x * b + this.pivot.y * d;
}
// concat the parent matrix with the objects transform.
wt.a = a * pt.a + b * pt.c;
wt.b = a * pt.b + b * pt.d;
wt.c = c * pt.a + d * pt.c;
wt.d = c * pt.b + d * pt.d;
wt.tx = tx * pt.a + ty * pt.c + pt.tx;
wt.ty = tx * pt.b + ty * pt.d + pt.ty;
}
else
{
// lets do the fast version as we know there is no rotation..
a = this.scale.x;
d = this.scale.y;
tx = this.position.x - this.pivot.x * a;
ty = this.position.y - this.pivot.y * d;
wt.a = a * pt.a;
wt.b = a * pt.b;
wt.c = d * pt.c;
wt.d = d * pt.d;
wt.tx = tx * pt.a + ty * pt.c + pt.tx;
wt.ty = tx * pt.b + ty * pt.d + pt.ty;
}
// multiply the alphas..
this.worldAlpha = this.alpha * p.worldAlpha;
this.worldPosition.set(wt.tx, wt.ty);
this.worldScale.set(wt.a, wt.d);
this.worldRotation = Math.atan2(wt.c, wt.d);
// reset the bounds each time this is called!
this._currentBounds = null;
// Custom callback?
if (this.transformCallback)
{
this.transformCallback.call(this.transformCallbackContext, wt, pt);
}
};
// performance increase to avoid using call.. (10x faster)
PIXI.DisplayObject.prototype.displayObjectUpdateTransform = PIXI.DisplayObject.prototype.updateTransform;
/**
* Retrieves the bounds of the displayObject as a rectangle object
*
* @method getBounds
* @param matrix {Matrix}
* @return {Rectangle} the rectangular bounding area
*/
PIXI.DisplayObject.prototype.getBounds = function(matrix)
{
matrix = matrix;//just to get passed js hinting (and preserve inheritance)
return PIXI.EmptyRectangle;
};
/**
* Retrieves the local bounds of the displayObject as a rectangle object
*
* @method getLocalBounds
* @return {Rectangle} the rectangular bounding area
*/
PIXI.DisplayObject.prototype.getLocalBounds = function()
{
return this.getBounds(PIXI.identityMatrix);///PIXI.EmptyRectangle();
};
/**
* Sets the object's stage reference, the stage this object is connected to
*
* @method setStageReference
* @param stage {Stage} the stage that the object will have as its current stage reference
*/
PIXI.DisplayObject.prototype.setStageReference = function(stage)
{
this.stage = stage;
};
/**
* Empty, to be overridden by classes that require it.
*
* @method preUpdate
*/
PIXI.DisplayObject.prototype.preUpdate = function()
{
};
/**
* Useful function that returns a texture of the displayObject object that can then be used to create sprites
* This can be quite useful if your displayObject is static / complicated and needs to be reused multiple times.
*
* @method generateTexture
* @param resolution {Number} The resolution of the texture being generated
* @param scaleMode {Number} See {{#crossLink "PIXI/scaleModes:property"}}PIXI.scaleModes{{/crossLink}} for possible values
* @param renderer {CanvasRenderer|WebGLRenderer} The renderer used to generate the texture.
* @return {RenderTexture} a texture of the graphics object
*/
PIXI.DisplayObject.prototype.generateTexture = function(resolution, scaleMode, renderer)
{
var bounds = this.getLocalBounds();
var renderTexture = new PIXI.RenderTexture(bounds.width | 0, bounds.height | 0, renderer, scaleMode, resolution);
PIXI.DisplayObject._tempMatrix.tx = -bounds.x;
PIXI.DisplayObject._tempMatrix.ty = -bounds.y;
renderTexture.render(this, PIXI.DisplayObject._tempMatrix);
return renderTexture;
};
/**
* Generates and updates the cached sprite for this object.
*
* @method updateCache
*/
PIXI.DisplayObject.prototype.updateCache = function()
{
this._generateCachedSprite();
};
/**
* Calculates the global position of the display object
*
* @method toGlobal
* @param position {Point} The world origin to calculate from
* @return {Point} A point object representing the position of this object
*/
PIXI.DisplayObject.prototype.toGlobal = function(position)
{
// don't need to u[date the lot
this.displayObjectUpdateTransform();
return this.worldTransform.apply(position);
};
/**
* Calculates the local position of the display object relative to another point
*
* @method toLocal
* @param position {Point} The world origin to calculate from
* @param [from] {DisplayObject} The DisplayObject to calculate the global position from
* @return {Point} A point object representing the position of this object
*/
PIXI.DisplayObject.prototype.toLocal = function(position, from)
{
if (from)
{
position = from.toGlobal(position);
}
// don't need to u[date the lot
this.displayObjectUpdateTransform();
return this.worldTransform.applyInverse(position);
};
/**
* Internal method.
*
* @method _renderCachedSprite
* @param renderSession {Object} The render session
* @private
*/
PIXI.DisplayObject.prototype._renderCachedSprite = function(renderSession)
{
this._cachedSprite.worldAlpha = this.worldAlpha;
if (renderSession.gl)
{
PIXI.Sprite.prototype._renderWebGL.call(this._cachedSprite, renderSession);
}
else
{
PIXI.Sprite.prototype._renderCanvas.call(this._cachedSprite, renderSession);
}
};
/**
* Internal method.
*
* @method _generateCachedSprite
* @private
*/
PIXI.DisplayObject.prototype._generateCachedSprite = function()
{
this._cacheAsBitmap = false;
var bounds = this.getLocalBounds();
// Round it off and force non-zero dimensions
bounds.width = Math.max(1, Math.ceil(bounds.width));
bounds.height = Math.max(1, Math.ceil(bounds.height));
this.updateTransform();
if (!this._cachedSprite)
{
var renderTexture = new PIXI.RenderTexture(bounds.width, bounds.height);
this._cachedSprite = new PIXI.Sprite(renderTexture);
this._cachedSprite.worldTransform = this.worldTransform;
}
else
{
this._cachedSprite.texture.resize(bounds.width, bounds.height);
}
// Remove filters
var tempFilters = this._filters;
this._filters = null;
this._cachedSprite.filters = tempFilters;
// PIXI.DisplayObject._tempMatrix.identity();
PIXI.DisplayObject._tempMatrix.tx = -bounds.x;
PIXI.DisplayObject._tempMatrix.ty = -bounds.y;
this._cachedSprite.texture.render(this, PIXI.DisplayObject._tempMatrix, true);
this._cachedSprite.anchor.x = -(bounds.x / bounds.width);
this._cachedSprite.anchor.y = -(bounds.y / bounds.height);
this._filters = tempFilters;
this._cacheAsBitmap = true;
};
/**
* Destroys the cached sprite.
*
* @method _destroyCachedSprite
* @private
*/
PIXI.DisplayObject.prototype._destroyCachedSprite = function()
{
if (!this._cachedSprite) return;
this._cachedSprite.texture.destroy(true);
// TODO could be object pooled!
this._cachedSprite = null;
};
/**
* Renders the object using the WebGL renderer
*
* @method _renderWebGL
* @param renderSession {RenderSession}
* @private
*/
PIXI.DisplayObject.prototype._renderWebGL = function(renderSession)
{
// OVERWRITE;
// this line is just here to pass jshinting :)
renderSession = renderSession;
};
/**
* Renders the object using the Canvas renderer
*
* @method _renderCanvas
* @param renderSession {RenderSession}
* @private
*/
PIXI.DisplayObject.prototype._renderCanvas = function(renderSession)
{
// OVERWRITE;
// this line is just here to pass jshinting :)
renderSession = renderSession;
};
/**
* The position of the displayObject on the x axis relative to the local coordinates of the parent.
*
* @property x
* @type Number
*/
Object.defineProperty(PIXI.DisplayObject.prototype, 'x', {
get: function() {
return this.position.x;
},
set: function(value) {
this.position.x = value;
}
});
/**
* The position of the displayObject on the y axis relative to the local coordinates of the parent.
*
* @property y
* @type Number
*/
Object.defineProperty(PIXI.DisplayObject.prototype, 'y', {
get: function() {
return this.position.y;
},
set: function(value) {
this.position.y = value;
}
});
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