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tentone.escher.js
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    <h1 class="page-title">Source: Object2D.js</h1>

    
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            <pre class="prettyprint source linenums"><code>import {Vector2} from "./math/Vector2.js";
import {Matrix} from "./math/Matrix.js";
import {UUID} from "./math/UUID.js";

/**
 * Base object class, implements all the object positioning and scaling features.
 *
 * Stores all the base properties shared between all objects as the position, transformation properties, children etc.
 *
 * Object2D object can be used as a group to the other objects drawn.
 *
 * @class
 */
function Object2D()
{
	/**
	 * UUID of the object.
	 *
	 * @type {string}
	 */
	this.uuid = UUID.generate(); 

	/**
	 * List of children objects attached to the object.
	 *
	 * @type {Object2D[]}
	 */
	this.children = [];

	/**
	 * Parent object, the object position is affected by its parent position.
	 *
	 * @type {Object2D}
	 */
	this.parent = null;

	/**
	 * Depth level in the object tree, objects with higher depth are drawn on top.
	 *
	 * The layer value is considered first.
	 *
	 * @type {number}
	 */
	this.level = 0;

	/**
	 * Position of the object.
	 *
	 * The world position of the object is affected by its parent transform.
	 *
	 * @type {Vector2}
	 */
	this.position = new Vector2(0, 0);

	/**
	 * Origin of the object used as point of rotation.
	 *
	 * @type {Vector2}
	 */
	this.origin = new Vector2(0, 0);

	/**
	 * Scale of the object.
	 *
	 * The world scale of the object is affected by the parent transform.
	 *
	 * @type {Vector2}
	 */
	this.scale = new Vector2(1, 1);

	/**
	 * Rotation of the object relative to its center.
	 *
	 * The world rotation of the object is affected by the parent transform.
	 *
	 * @type {number}
	 */
	this.rotation = 0.0;

	/**
	 * Indicates if the object is visible.
	 *
	 * @type {boolean}
	 */
	this.visible = true;

	/**
	 * Layer of this object, objects are sorted by layer value.
	 *
	 * Lower layer value is draw first, higher layer value is drawn on top.
	 *
	 * @type {number}
	 */
	this.layer = 0;

	/**
	 * Local transformation matrix applied to the object.
	 *
	 * @type {Matrix}
	 */
	this.matrix = new Matrix();

	/**
	 * Global transformation matrix multiplied by the parent matrix.
	 *
	 * Used to transform the object before projecting into screen coordinates.
	 *
	 * @type {Matrix}
	 */
	this.globalMatrix = new Matrix();

	/**
	 * Inverse of the global (world) transform matrix.
	 *
	 * Used to convert pointer input points (viewport space) into object coordinates.
	 *
	 * @type {Matrix}
	 */
	this.inverseGlobalMatrix = new Matrix();

	/**
	 * Mask objects being applied to this object. Used to mask/subtract portions of this object when rendering.
	 *
	 * Multiple masks can be used simultaneously. Same mask might be reused for multiple objects.
	 *
	 * @type {Mask[]}
	 */
	this.masks = [];

	/**
	 * Indicates if the transform matrix should be automatically updated every frame.
	 *
	 * Set this false for better performance. But if you do so dont forget to set matrixNeedsUpdate every time that a transform attribute is changed.
	 *
	 * @type {boolean}
	 */
	this.matrixAutoUpdate = true;

	/**
	 * Indicates if the matrix needs to be updated, should be set true after changes to the object position, scale or rotation.
	 *
	 * The matrix is updated before rendering the object, after the matrix is updated this attribute is automatically reset to false.
	 *
	 * @type {boolean}
	 */
	this.matrixNeedsUpdate = true;

	/**
	 * Draggable controls if its possible to drag the object around. Set this true to enable dragging events on this object.
	 *
	 * The onPointerDrag callback is used to update the state of the object while being dragged, by default it just updates the object position.
	 *
	 * @type {boolean}
	 */
	this.draggable = false;

	/**
	 * Indicates if this object uses pointer events.
	 *
	 * Can be set false to skip the pointer interaction events, better performance if pointer events are not required.
	 *
	 * @type {boolean}
	 */
	this.pointerEvents = true;

	/**
	 * Flag to indicate whether this object ignores the viewport transformation.
	 *
	 * @type {boolean}
	 */
	this.ignoreViewport = false;

	/**
	 * Flag to indicate if the context of canvas should be saved before render.
	 *
	 * @type {boolean}
	 */
	this.saveContextState = true;

	/**
	 * Flag to indicate if the context of canvas should be restored after render.
	 *
	 * @type {boolean}
	 */
	this.restoreContextState = true;

	/**
	 * Flag indicating if the pointer is inside of the element.
	 *
	 * Used to control object event.
	 *
	 * @type {boolean}
	 */
	this.pointerInside = false;

	/**
	 * Flag to indicate if the object is currently being dragged.
	 *
	 * @type {boolean}
	 */
	this.beingDragged = false;

	/**
	 * Indicates if the object should be serialized or not as a child of another object.
	 *
	 * Used to prevent duplicate serialization data on custom objects. Should be set false for objects added on constructor.
	 *
	 * @type {boolean}
	 */
	this.serializable = true;
}

Object2D.prototype.constructor = Object2D;

/**
 * Type of the object, used for data serialization and/or checking the object type.
 *
 * The name used should match the object constructor name. But it is not required.
 *
 * If this type is from an external library you can add the library name to the object type name to prevent collisions.
 *
 * @type {string}
 */
Object2D.prototype.type = "Object2D";

/**
 * List of available object types known by the application. Stores the object constructor by object type.
 *
 * Newly created types should be introduced in this map for data serialization support.
 *
 * New object types should be added using the Object2D.register() method.
 *
 * @static
 * @type {Map&lt;string, Function>}
 */
Object2D.types = new Map([[Object2D.prototype.type, Object2D]]);

/**
 * Register a object type into the application. Associates the type string to the object constructor.
 *
 * Should be called for every new object class implemented if you want to be able to serialize and parse data.
 *
 * @static
 * @param {Function} constructor Object constructor.
 * @param {string} type Object type name.
 */
Object2D.register = function(constructor, type)
{
	Object2D.types.set(type, constructor);
};

/**
 * Check if a point in world coordinates intersects this object or its children and get a list of the objects intersected.
 *
 * @param {Vector2} point Point in world coordinates.
 * @param {Object2D[]} list List of objects intersected passed to children objects recursively.
 * @return {Object2D[]} List of object intersected by this point.
 */
Object2D.prototype.getWorldPointIntersections = function(point, list)
{
	if(list === undefined)
	{
		list = [];
	}

	// Calculate the pointer position in the object coordinates
	var localPoint = this.inverseGlobalMatrix.transformPoint(point);
	if(this.isInside(localPoint))
	{
		list.push(this);
	}

	// Iterate trough the children
	for(var i = 0; i &lt; this.children.length; i++)
	{
		this.children[i].getWorldPointIntersections(point, list);
	}

	return list;
};

/**
 * Check if a point in world coordinates intersects this object or some of its children.
 *
 * @param {Vector2} point Point in world coordinates.
 * @param {boolean} recursive If set to true it will also check intersections with the object children.
 * @return {boolean} Returns true if the point in inside of the object.
 */
Object2D.prototype.isWorldPointInside = function(point, recursive)
{
	// Calculate the pointer position in the object coordinates
	var localPoint = this.inverseGlobalMatrix.transformPoint(point);
	if(this.isInside(localPoint))
	{
		return true;
	}

	// Iterate trough the children
	if(recursive)
	{
		for(var i = 0; i &lt; this.children.length; i++)
		{
			if(this.children[i].isWorldPointInside(point, true))
			{
				return true;
			}
		}
	}

	return false;
};


/**
 * Destroy the object, removes it from the parent object.
 */
Object2D.prototype.destroy = function()
{
	if(this.parent !== null)
	{
		this.parent.remove(this);
	}
};

/**
 * Traverse the object tree and run a function for all objects.
 *
 * @param {Function} callback Callback function that receives the object as parameter.
 */
Object2D.prototype.traverse = function(callback)
{
	callback(this);

	for(var i = 0; i &lt; this.children.length; i++)
	{
		this.children[i].traverse(callback);
	}
};

/**
 * Get a object from its children list by its UUID.
 *
 * @param {string} uuid UUID of the object to get.
 * @return {Object2D} The object that has the UUID specified, null if the object was not found.
 */
Object2D.prototype.getChildByUUID = function(uuid)
{
	var object = null;

	this.traverse(function(child)
	{
		if(child.uuid === uuid)
		{
			object = child;
		}
	});

	return object;
};

/**
 * Attach a children to this object.
 *
 * The object is set as children of this object and the transformations applied to this object are traversed to its children.
 *
 * @param {Object2D} object Object to attach to this object.
 */ 
Object2D.prototype.add = function(object)
{
	object.parent = this;
	object.level = this.level + 1;

	object.traverse(function(child)
	{
		if(child.onAdd !== null)
		{
			child.onAdd(this);
		}
	});

	this.children.push(object);
};

/**
 * Remove object from the children list.
 * 
 * Resets the parent of the object to null and resets its level.
 *
 * @param {Object2D} children Object to be removed.
 */
Object2D.prototype.remove = function(children)
{
	var index = this.children.indexOf(children);
	
	if(index !== -1)
	{
		var object = this.children[index];
		object.parent = null;
		object.level = 0;

		object.traverse(function(child)
		{
			if(child.onRemove !== null)
			{
				child.onRemove(this);
			}
		});

		this.children.splice(index, 1)
	}
};

/**
 * Check if a point is inside of the object. Used by the renderer check for pointer collision (required for the object to properly process pointer events).
 *
 * Point should be in local object coordinates.
 *
 * To check if a point in world coordinates intersects the object the inverseGlobalMatrix should be applied to that point before calling this method.
 *
 * @param {Vector2} point Point in local object coordinates.
 * @return {boolean} True if the point is inside of the object.
 */
Object2D.prototype.isInside = function(point)
{
	return false;
};

/**
 * Update the transformation matrix of the object.
 *
 * @param {CanvasRenderingContext2D} context Canvas 2d drawing context.
 */
Object2D.prototype.updateMatrix = function(context)
{
	if(this.matrixAutoUpdate || this.matrixNeedsUpdate)
	{
		this.matrix.compose(this.position.x, this.position.y, this.scale.x, this.scale.y, this.origin.x, this.origin.y, this.rotation);
		this.globalMatrix.copy(this.matrix);

		if(this.parent !== null)
		{	
			this.globalMatrix.premultiply(this.parent.globalMatrix);
		}

		this.inverseGlobalMatrix = this.globalMatrix.getInverse()
		this.matrixNeedsUpdate = false;
	}
};

/**
 * Apply the transform to the rendering context, it is assumed that the viewport transform is pre-applied to the context.
 *
 * This is called before style() and draw(). It can also be used for some pre-rendering logic.
 *
 * @param {CanvasRenderingContext2D} context Canvas 2d drawing context.
 * @param {Viewport} viewport Viewport applied to the canvas.
 * @param {Element} canvas DOM canvas element where the content is being drawn.
 * @param {Renderer} renderer Renderer object being used to draw the object into the canvas.
 */
Object2D.prototype.transform = function(context, viewport, canvas, renderer)
{
	this.globalMatrix.tranformContext(context);
};

/**
 * Style is called right before draw() it should not draw any content into the canvas, all context styling should be applied here (colors, fonts, etc).
 *
 * The draw() and style() methods can be  useful for objects that share the same styling attributes but are drawing differently.
 *
 * Should be implemented by underlying classes.
 *
 * @param {CanvasRenderingContext2D} context Canvas 2d drawing context.
 * @param {Viewport} viewport Viewport used to view the canvas content.
 * @param {Element} canvas DOM canvas element where the content is being drawn.
 */
Object2D.prototype.style = null; // function(context, viewport, canvas){};

/**
 * Draw the object into the canvas, this is called transform() and style(), should be where the content is actually drawn into the canvas.
 *
 * Should be implemented by underlying classes.
 *
 * @param {CanvasRenderingContext2D} context Canvas 2d drawing context.
 * @param {Viewport} viewport Viewport used to view the canvas content.
 * @param {Element} canvas DOM canvas element where the content is being drawn.
 */
Object2D.prototype.draw = null; // function(context, viewport, canvas){};

/**
 * Callback method while the object is being dragged across the screen.
 *
 * By default is adds the delta value to the object position (making it follow the mouse movement).
 *
 * Delta is the movement of the pointer already translated into local object coordinates.
 *
 * To detect when the object drag stops the onPointerDragEnd() method can be used.
 *
 * @param {Pointer} pointer Pointer object that receives the user input.
 * @param {Viewport} viewport Viewport where the object is drawn.
 * @param {Vector2} delta Pointer movement diff in world space since the last frame.
 * @param {Vector2} positionWorld Position of the dragging pointer in world coordinates.
 */
Object2D.prototype.onPointerDrag = function(pointer, viewport, delta, positionWorld)
{
	this.position.add(delta);
};

/**
 * Callback method called when the pointer drag start after the button was pressed
 *
 * @param {Pointer} pointer Pointer object that receives the user input.
 * @param {Viewport} viewport Viewport where the object is drawn.
 */
Object2D.prototype.onPointerDragStart = null;

/**
 * Callback method called when the pointer drag ends after the button has been released.
 *
 * @param {Pointer} pointer Pointer object that receives the user input.
 * @param {Viewport} viewport Viewport where the object is drawn.
 */
Object2D.prototype.onPointerDragEnd = null;

/**
 * Method called when the object its added to a parent.
 *
 * @param {Object2D} parent Parent object were it was added.
 */
Object2D.prototype.onAdd = null;

/**
 * Method called when the object gets removed from its parent
 *
 * @param {Object2D} parent Parent object from were the object is being removed.
 */
Object2D.prototype.onRemove = null;

/**
 * Callback method called every time before the object is draw into the canvas.
 *
 * Should be used to run object logic, any preparation code, move the object, etc.
 *
 * This method is called for every object before rendering.
 */
Object2D.prototype.onUpdate = null;

/**
 * Callback method called when the pointer enters the object.
 *
 * It is not called while the pointer is inside of the object, just on the first time that the pointer enters the object for that use onPointerOver()
 *
 * @param {Pointer} pointer Pointer object that receives the user input.
 * @param {Viewport} viewport Viewport where the object is drawn.
 */
Object2D.prototype.onPointerEnter = null;

/**
 * Method called when the was inside of the object and leaves the object.
 *
 * @param {Pointer} pointer Pointer object that receives the user input.
 * @param {Viewport} viewport Viewport where the object is drawn.
 */
Object2D.prototype.onPointerLeave = null;

/**
 * Method while the pointer is over (inside) of the object.
 *
 * @param {Pointer} pointer Pointer object that receives the user input.
 * @param {Viewport} viewport Viewport where the object is drawn.
 */
Object2D.prototype.onPointerOver = null;

/**
 * Method called while the pointer button is pressed.
 *
 * @param {Pointer} pointer Pointer object that receives the user input.
 * @param {Viewport} viewport Viewport where the object is drawn.
 */
Object2D.prototype.onButtonPressed = null;

/**
 * Method called while the pointer button is double clicked.
 *
 * @param {Pointer} pointer Pointer object that receives the user input.
 * @param {Viewport} viewport Viewport where the object is drawn.
 */
Object2D.prototype.onDoubleClick = null;

/**
 * Callback method called when the pointer button is pressed down (single time).
 *
 * @param {Pointer} pointer Pointer object that receives the user input.
 * @param {Viewport} viewport Viewport where the object is drawn.
 */
Object2D.prototype.onButtonDown = null;

/**
 * Method called when the pointer button is released (single time).
 *
 * @param {Pointer} pointer Pointer object that receives the user input.
 * @param {Viewport} viewport Viewport where the object is drawn.
 */
Object2D.prototype.onButtonUp = null;

/**
 * Serialize the object data into a JSON object. That can be written into a file, sent using HTTP request etc.
 *
 * All required attributes to recreate the object in its current state should be stored. Relations between children should be stored by their UUID only.
 *
 * Data has to be parsed back into a usable object.
 *
 * @param {boolean} recursive If set false the children list is not serialized, otherwise all children are serialized.
 * @return {Object} Serialized object data.
 */
Object2D.prototype.serialize = function(recursive)
{
	var data = {
		uuid: this.uuid,
		type: this.type,
		position: this.position.toArray(),
		origin: this.origin.toArray(),
		scale: this.scale.toArray(),
		rotation: this.rotation,
		visible: this.visible,
		layer: this.layer,
		matrix: this.matrix.m,
		globalMatrix: this.globalMatrix.m,
		inverseGlobalMatrix: this.inverseGlobalMatrix.m,
		matrixAutoUpdate: this.matrixAutoUpdate,
		draggable: this.draggable,
		pointerEvents: this.pointerEvents,
		ignoreViewport: this.ignoreViewport,
		saveContextState: this.saveContextState,
		restoreContextState: this.restoreContextState,
		children: [],
		masks: []
	};

	if(recursive !== false)
	{
		for(var i = 0; i &lt; this.children.length; i++)
		{
			if(this.children[i].serializable)
			{
				data.children.push(this.children[i].serialize());
			}
		}
	}

	for(var i = 0; i &lt; this.masks.length; i++)
	{
		data.masks.push(this.masks[i].uuid);
	}

	return data;
};

/**
 * Parse serialized object data and fill the object attributes.
 *
 * Implementations of this method should only load the attributes added to the structure, the based method already loads common attributes.
 *
 * Dont forget to register object types using the Object2D.register() method.
 *
 * @param {Object} data Object data loaded from JSON.
 * @param {Object2D} root Root object being loaded can be used to get references to other objects.
 */
Object2D.prototype.parse = function(data, root)
{
	this.uuid = data.uuid;
	this.position.fromArray(data.position);
	this.origin.fromArray(data.origin);
	this.scale.fromArray(data.scale);
	this.rotation = data.rotation;
	this.visible = data.visible;
	this.layer = data.layer;
	this.matrix = new Matrix(data.matrix);
	this.globalMatrix = new Matrix(data.globalMatrix);
	this.inverseGlobalMatrix = new Matrix(data.inverseGlobalMatrix);
	this.matrixAutoUpdate = data.matrixAutoUpdate;
	this.draggable = data.draggable;
	this.pointerEvents = data.pointerEvents;
	this.ignoreViewport = data.ignoreViewport;
	this.saveContextState = data.saveContextState;
	this.restoreContextState = data.restoreContextState;

	for(var i = 0; i &lt; this.masks.length; i++)
	{
		data.masks.push(root.getChildByUUID(data.masks[i]));
	}
};

/**
 * Create objects from serialized object data into the proper data structures.
 *
 * All objects should implement serialization methods to serialize and load data properly.
 *
 * First all objects instances are created to ensure that object trying to get references to other object can have the data accessible, only then the parse method is called.
 *
 * @static
 * @param {Object} data Object data loaded from JSON.
 * @return {Object2D} Parsed object data.
 */
Object2D.parse = function(data)
{
	// List of objects created stored as pairs of object, data to be later parsed.
	var objects = [];

	// Parse all objects from the data object recursively and create the correct instances.
	function createObjectInstances(data)
	{
		if(!Object2D.types.has(data.type))
		{
			throw new Error("Object type " + data.type + " unknown. Cannot parse data.");
		}

		var Constructor = Object2D.types.get(data.type);
		var object = new Constructor();
		object.uuid = data.uuid;

		objects.push({object: object, data: data});

		for(var i = 0; i &lt; data.children.length; i++)
		{
			object.add(createObjectInstances(data.children[i]));
		}

		return object;
	}

	var root = createObjectInstances(data);

	// Parse objects data
	for(var i = 0; i &lt; objects.length; i++)
	{
		objects[i].object.parse(objects[i].data, root);
	}

	return root;
};

export {Object2D};
</code></pre>
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