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// Copyright 2007 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/**
* @fileoverview A thin wrapper around the DOM element returned from
* the different draw methods of the graphics implementation, and
* all interfaces that the various element types support.
* @author arv@google.com (Erik Arvidsson)
*/
goog.provide('goog.graphics.Element');
goog.require('goog.asserts');
goog.require('goog.events');
goog.require('goog.events.EventTarget');
goog.require('goog.events.Listenable');
goog.require('goog.graphics.AffineTransform');
goog.require('goog.math');
/**
* Base class for a thin wrapper around the DOM element returned from
* the different draw methods of the graphics.
* You should not construct objects from this constructor. The graphics
* will return the object for you.
* @param {Element} element The DOM element to wrap.
* @param {goog.graphics.AbstractGraphics} graphics The graphics creating
* this element.
* @constructor
* @extends {goog.events.EventTarget}
* @deprecated goog.graphics is deprecated. It existed to abstract over browser
* differences before the canvas tag was widely supported. See
* http://en.wikipedia.org/wiki/Canvas_element for details.
*/
goog.graphics.Element = function(element, graphics) {
goog.events.EventTarget.call(this);
this.element_ = element;
this.graphics_ = graphics;
// Overloading EventTarget field to state that this is not a custom event.
// TODO(user) Should be handled in EventTarget.js (see bug 846824).
this[goog.events.Listenable.IMPLEMENTED_BY_PROP] = false;
};
goog.inherits(goog.graphics.Element, goog.events.EventTarget);
/**
* The graphics object that contains this element.
* @type {goog.graphics.AbstractGraphics?}
* @private
*/
goog.graphics.Element.prototype.graphics_ = null;
/**
* The native browser element this class wraps.
* @type {Element}
* @private
*/
goog.graphics.Element.prototype.element_ = null;
/**
* The transformation applied to this element.
* @type {goog.graphics.AffineTransform?}
* @private
*/
goog.graphics.Element.prototype.transform_ = null;
/**
* Returns the underlying object.
* @return {Element} The underlying element.
*/
goog.graphics.Element.prototype.getElement = function() {
return this.element_;
};
/**
* Returns the graphics.
* @return {goog.graphics.AbstractGraphics} The graphics that created the
* element.
*/
goog.graphics.Element.prototype.getGraphics = function() {
return this.graphics_;
};
/**
* Set the translation and rotation of the element.
*
* If a more general affine transform is needed than this provides
* (e.g. skew and scale) then use setTransform.
* @param {number} x The x coordinate of the translation transform.
* @param {number} y The y coordinate of the translation transform.
* @param {number} rotate The angle of the rotation transform.
* @param {number} centerX The horizontal center of the rotation transform.
* @param {number} centerY The vertical center of the rotation transform.
*/
goog.graphics.Element.prototype.setTransformation = function(
x, y, rotate, centerX, centerY) {
this.transform_ =
goog.graphics.AffineTransform
.getRotateInstance(goog.math.toRadians(rotate), centerX, centerY)
.translate(x, y);
this.getGraphics().setElementTransform(this, x, y, rotate, centerX, centerY);
};
/**
* @return {!goog.graphics.AffineTransform} The transformation applied to
* this element.
*/
goog.graphics.Element.prototype.getTransform = function() {
return this.transform_ ? this.transform_.clone() :
new goog.graphics.AffineTransform();
};
/**
* Set the affine transform of the element.
* @param {!goog.graphics.AffineTransform} affineTransform The
* transformation applied to this element.
*/
goog.graphics.Element.prototype.setTransform = function(affineTransform) {
this.transform_ = affineTransform.clone();
this.getGraphics().setElementAffineTransform(this, affineTransform);
};
/** @override */
goog.graphics.Element.prototype.addEventListener = function(
type, handler, opt_capture, opt_handlerScope) {
goog.events.listen(
this.element_, type, handler, opt_capture, opt_handlerScope);
};
/** @override */
goog.graphics.Element.prototype.removeEventListener = function(
type, handler, opt_capture, opt_handlerScope) {
goog.events.unlisten(
this.element_, type, handler, opt_capture, opt_handlerScope);
};
/** @override */
goog.graphics.Element.prototype.disposeInternal = function() {
goog.graphics.Element.superClass_.disposeInternal.call(this);
goog.asserts.assert(this.element_);
goog.events.removeAll(this.element_);
};
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