import EventEmitter from 'eventemitter3';
import { TRANSFORM_MODE } from '../const';
import settings from '../settings';
import TransformStatic from './TransformStatic';
import Transform from './Transform';
import Bounds from './Bounds';
import { Rectangle } from '../math';
// _tempDisplayObjectParent = new DisplayObject();
/**
* 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
* @extends EventEmitter
* @memberof PIXI
*/
export default class DisplayObject extends EventEmitter
{
/**
*
*/
constructor()
{
super();
const TransformClass = settings.TRANSFORM_MODE === TRANSFORM_MODE.STATIC ? TransformStatic : Transform;
this.tempDisplayObjectParent = null;
// TODO: need to create Transform from factory
/**
* World transform and local transform of this object.
* This will become read-only later, please do not assign anything there unless you know what are you doing
*
* @member {PIXI.TransformBase}
*/
this.transform = new TransformClass();
/**
* The opacity of the object.
*
* @member {number}
*/
this.alpha = 1;
/**
* The visibility of the object. If false the object will not be drawn, and
* the updateTransform function will not be called.
*
* Only affects recursive calls from parent. You can ask for bounds or call updateTransform manually
*
* @member {boolean}
*/
this.visible = true;
/**
* Can this object be rendered, if false the object will not be drawn but the updateTransform
* methods will still be called.
*
* Only affects recursive calls from parent. You can ask for bounds manually
*
* @member {boolean}
*/
this.renderable = true;
/**
* The display object container that contains this display object.
*
* @member {PIXI.Container}
* @readonly
*/
this.parent = null;
/**
* The multiplied alpha of the displayObject
*
* @member {number}
* @readonly
*/
this.worldAlpha = 1;
/**
* The area the filter is applied to. This is used as more of an optimisation
* rather than figuring out the dimensions of the displayObject each frame you can set this rectangle
*
* Also works as an interaction mask
*
* @member {PIXI.Rectangle}
*/
this.filterArea = null;
this._filters = null;
this._enabledFilters = null;
/**
* The bounds object, this is used to calculate and store the bounds of the displayObject
*
* @member {PIXI.Rectangle}
* @private
*/
this._bounds = new Bounds();
this._boundsID = 0;
this._lastBoundsID = -1;
this._boundsRect = null;
this._localBoundsRect = null;
/**
* The original, cached mask of the object
*
* @member {PIXI.Graphics|PIXI.Sprite}
* @private
*/
this._mask = null;
/**
* If the object has been destroyed via destroy(). If true, it should not be used.
*
* @member {boolean}
* @private
* @readonly
*/
this._destroyed = false;
/**
* Fired when this DisplayObject is added to a Container.
*
* @event PIXI.DisplayObject#added
* @param {PIXI.Container} container - The container added to.
*/
/**
* Fired when this DisplayObject is removed from a Container.
*
* @event PIXI.DisplayObject#removed
* @param {PIXI.Container} container - The container removed from.
*/
}
/**
* @private
* @member {PIXI.DisplayObject}
*/
get _tempDisplayObjectParent()
{
if (this.tempDisplayObjectParent === null)
{
this.tempDisplayObjectParent = new DisplayObject();
}
return this.tempDisplayObjectParent;
}
/**
* Updates the object transform for rendering
*
* TODO - Optimization pass!
*/
updateTransform()
{
this.transform.updateTransform(this.parent.transform);
// multiply the alphas..
this.worldAlpha = this.alpha * this.parent.worldAlpha;
this._bounds.updateID++;
}
/**
* recursively updates transform of all objects from the root to this one
* internal function for toLocal()
*/
_recursivePostUpdateTransform()
{
if (this.parent)
{
this.parent._recursivePostUpdateTransform();
this.transform.updateTransform(this.parent.transform);
}
else
{
this.transform.updateTransform(this._tempDisplayObjectParent.transform);
}
}
/**
* Retrieves the bounds of the displayObject as a rectangle object.
*
* @param {boolean} skipUpdate - setting to true will stop the transforms of the scene graph from
* being updated. This means the calculation returned MAY be out of date BUT will give you a
* nice performance boost
* @param {PIXI.Rectangle} rect - Optional rectangle to store the result of the bounds calculation
* @return {PIXI.Rectangle} the rectangular bounding area
*/
getBounds(skipUpdate, rect)
{
if (!skipUpdate)
{
if (!this.parent)
{
this.parent = this._tempDisplayObjectParent;
this.updateTransform();
this.parent = null;
}
else
{
this._recursivePostUpdateTransform();
this.updateTransform();
}
}
if (this._boundsID !== this._lastBoundsID)
{
this.calculateBounds();
}
if (!rect)
{
if (!this._boundsRect)
{
this._boundsRect = new Rectangle();
}
rect = this._boundsRect;
}
return this._bounds.getRectangle(rect);
}
/**
* Retrieves the local bounds of the displayObject as a rectangle object
*
* @param {PIXI.Rectangle} [rect] - Optional rectangle to store the result of the bounds calculation
* @return {PIXI.Rectangle} the rectangular bounding area
*/
getLocalBounds(rect)
{
const transformRef = this.transform;
const parentRef = this.parent;
this.parent = null;
this.transform = this._tempDisplayObjectParent.transform;
if (!rect)
{
if (!this._localBoundsRect)
{
this._localBoundsRect = new Rectangle();
}
rect = this._localBoundsRect;
}
const bounds = this.getBounds(false, rect);
this.parent = parentRef;
this.transform = transformRef;
return bounds;
}
/**
* Calculates the global position of the display object
*
* @param {PIXI.Point} position - The world origin to calculate from
* @param {PIXI.Point} [point] - A Point object in which to store the value, optional
* (otherwise will create a new Point)
* @param {boolean} [skipUpdate=false] - Should we skip the update transform.
* @return {PIXI.Point} A point object representing the position of this object
*/
toGlobal(position, point, skipUpdate = false)
{
if (!skipUpdate)
{
this._recursivePostUpdateTransform();
// this parent check is for just in case the item is a root object.
// If it is we need to give it a temporary parent so that displayObjectUpdateTransform works correctly
// this is mainly to avoid a parent check in the main loop. Every little helps for performance :)
if (!this.parent)
{
this.parent = this._tempDisplayObjectParent;
this.displayObjectUpdateTransform();
this.parent = null;
}
else
{
this.displayObjectUpdateTransform();
}
}
// don't need to update the lot
return this.worldTransform.apply(position, point);
}
/**
* Calculates the local position of the display object relative to another point
*
* @param {PIXI.Point} position - The world origin to calculate from
* @param {PIXI.DisplayObject} [from] - The DisplayObject to calculate the global position from
* @param {PIXI.Point} [point] - A Point object in which to store the value, optional
* (otherwise will create a new Point)
* @param {boolean} [skipUpdate=false] - Should we skip the update transform
* @return {PIXI.Point} A point object representing the position of this object
*/
toLocal(position, from, point, skipUpdate)
{
if (from)
{
position = from.toGlobal(position, point, skipUpdate);
}
if (!skipUpdate)
{
this._recursivePostUpdateTransform();
// this parent check is for just in case the item is a root object.
// If it is we need to give it a temporary parent so that displayObjectUpdateTransform works correctly
// this is mainly to avoid a parent check in the main loop. Every little helps for performance :)
if (!this.parent)
{
this.parent = this._tempDisplayObjectParent;
this.displayObjectUpdateTransform();
this.parent = null;
}
else
{
this.displayObjectUpdateTransform();
}
}
// simply apply the matrix..
return this.worldTransform.applyInverse(position, point);
}
/**
* Renders the object using the WebGL renderer
*
* @param {PIXI.WebGLRenderer} renderer - The renderer
*/
renderWebGL(renderer) // eslint-disable-line no-unused-vars
{
// OVERWRITE;
}
/**
* Renders the object using the Canvas renderer
*
* @param {PIXI.CanvasRenderer} renderer - The renderer
*/
renderCanvas(renderer) // eslint-disable-line no-unused-vars
{
// OVERWRITE;
}
/**
* Set the parent Container of this DisplayObject
*
* @param {PIXI.Container} container - The Container to add this DisplayObject to
* @return {PIXI.Container} The Container that this DisplayObject was added to
*/
setParent(container)
{
if (!container || !container.addChild)
{
throw new Error('setParent: Argument must be a Container');
}
container.addChild(this);
return container;
}
/**
* Convenience function to set the position, scale, skew and pivot at once.
*
* @param {number} [x=0] - The X position
* @param {number} [y=0] - The Y position
* @param {number} [scaleX=1] - The X scale value
* @param {number} [scaleY=1] - The Y scale value
* @param {number} [rotation=0] - The rotation
* @param {number} [skewX=0] - The X skew value
* @param {number} [skewY=0] - The Y skew value
* @param {number} [pivotX=0] - The X pivot value
* @param {number} [pivotY=0] - The Y pivot value
* @return {PIXI.DisplayObject} The DisplayObject instance
*/
setTransform(x = 0, y = 0, scaleX = 1, scaleY = 1, rotation = 0, skewX = 0, skewY = 0, pivotX = 0, pivotY = 0)
{
this.position.x = x;
this.position.y = y;
this.scale.x = !scaleX ? 1 : scaleX;
this.scale.y = !scaleY ? 1 : scaleY;
this.rotation = rotation;
this.skew.x = skewX;
this.skew.y = skewY;
this.pivot.x = pivotX;
this.pivot.y = pivotY;
return this;
}
/**
* Base destroy method for generic display objects. This will automatically
* remove the display object from its parent Container as well as remove
* all current event listeners and internal references. Do not use a DisplayObject
* after calling `destroy`.
*
*/
destroy()
{
this.removeAllListeners();
if (this.parent)
{
this.parent.removeChild(this);
}
this.transform = null;
this.parent = null;
this._bounds = null;
this._currentBounds = null;
this._mask = null;
this.filterArea = null;
this.interactive = false;
this.interactiveChildren = false;
this._destroyed = true;
}
/**
* The position of the displayObject on the x axis relative to the local coordinates of the parent.
* An alias to position.x
*
* @member {number}
*/
get x()
{
return this.position.x;
}
set x(value) // eslint-disable-line require-jsdoc
{
this.transform.position.x = value;
}
/**
* The position of the displayObject on the y axis relative to the local coordinates of the parent.
* An alias to position.y
*
* @member {number}
*/
get y()
{
return this.position.y;
}
set y(value) // eslint-disable-line require-jsdoc
{
this.transform.position.y = value;
}
/**
* Current transform of the object based on world (parent) factors
*
* @member {PIXI.Matrix}
* @readonly
*/
get worldTransform()
{
return this.transform.worldTransform;
}
/**
* Current transform of the object based on local factors: position, scale, other stuff
*
* @member {PIXI.Matrix}
* @readonly
*/
get localTransform()
{
return this.transform.localTransform;
}
/**
* The coordinate of the object relative to the local coordinates of the parent.
* Assignment by value since pixi-v4.
*
* @member {PIXI.Point|PIXI.ObservablePoint}
*/
get position()
{
return this.transform.position;
}
set position(value) // eslint-disable-line require-jsdoc
{
this.transform.position.copy(value);
}
/**
* The scale factor of the object.
* Assignment by value since pixi-v4.
*
* @member {PIXI.Point|PIXI.ObservablePoint}
*/
get scale()
{
return this.transform.scale;
}
set scale(value) // eslint-disable-line require-jsdoc
{
this.transform.scale.copy(value);
}
/**
* The pivot point of the displayObject that it rotates around.
* Assignment by value since pixi-v4.
*
* @member {PIXI.Point|PIXI.ObservablePoint}
*/
get pivot()
{
return this.transform.pivot;
}
set pivot(value) // eslint-disable-line require-jsdoc
{
this.transform.pivot.copy(value);
}
/**
* The skew factor for the object in radians.
* Assignment by value since pixi-v4.
*
* @member {PIXI.ObservablePoint}
*/
get skew()
{
return this.transform.skew;
}
set skew(value) // eslint-disable-line require-jsdoc
{
this.transform.skew.copy(value);
}
/**
* The rotation of the object in radians.
*
* @member {number}
*/
get rotation()
{
return this.transform.rotation;
}
set rotation(value) // eslint-disable-line require-jsdoc
{
this.transform.rotation = value;
}
/**
* Indicates if the object is globally visible.
*
* @member {boolean}
* @readonly
*/
get worldVisible()
{
let 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 or a PIXI.Sprite object. This allows for much faster masking in canvas as it
* utilises shape clipping. To remove a mask, set this property to null.
*
* @todo For the moment, PIXI.CanvasRenderer doesn't support PIXI.Sprite as mask.
*
* @member {PIXI.Graphics|PIXI.Sprite}
*/
get mask()
{
return this._mask;
}
set mask(value) // eslint-disable-line require-jsdoc
{
if (this._mask)
{
this._mask.renderable = true;
this._mask.isMask = false;
}
this._mask = value;
if (this._mask)
{
this._mask.renderable = false;
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'
*
* @member {PIXI.Filter[]}
*/
get filters()
{
return this._filters && this._filters.slice();
}
set filters(value) // eslint-disable-line require-jsdoc
{
this._filters = value && value.slice();
}
}
// performance increase to avoid using call.. (10x faster)
DisplayObject.prototype.displayObjectUpdateTransform = DisplayObject.prototype.updateTransform;