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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 Represents a gradient to be used with a Graphics implementor.
* @author arv@google.com (Erik Arvidsson)
*/
goog.provide('goog.graphics.LinearGradient');
goog.require('goog.asserts');
goog.require('goog.graphics.Fill');
/**
* Creates an immutable linear gradient fill object.
*
* @param {number} x1 Start X position of the gradient.
* @param {number} y1 Start Y position of the gradient.
* @param {number} x2 End X position of the gradient.
* @param {number} y2 End Y position of the gradient.
* @param {string} color1 Start color of the gradient.
* @param {string} color2 End color of the gradient.
* @param {?number=} opt_opacity1 Start opacity of the gradient, both or neither
* of opt_opacity1 and opt_opacity2 have to be set.
* @param {?number=} opt_opacity2 End opacity of the gradient.
* @constructor
* @extends {goog.graphics.Fill}
* @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.
* @final
*/
goog.graphics.LinearGradient = function(
x1, y1, x2, y2, color1, color2, opt_opacity1, opt_opacity2) {
/**
* Start X position of the gradient.
* @type {number}
* @private
*/
this.x1_ = x1;
/**
* Start Y position of the gradient.
* @type {number}
* @private
*/
this.y1_ = y1;
/**
* End X position of the gradient.
* @type {number}
* @private
*/
this.x2_ = x2;
/**
* End Y position of the gradient.
* @type {number}
* @private
*/
this.y2_ = y2;
/**
* Start color of the gradient.
* @type {string}
* @private
*/
this.color1_ = color1;
/**
* End color of the gradient.
* @type {string}
* @private
*/
this.color2_ = color2;
goog.asserts.assert(
goog.isNumber(opt_opacity1) == goog.isNumber(opt_opacity2),
'Both or neither of opt_opacity1 and opt_opacity2 have to be set.');
/**
* Start opacity of the gradient.
* @type {?number}
* @private
*/
this.opacity1_ = goog.isDef(opt_opacity1) ? opt_opacity1 : null;
/**
* End opacity of the gradient.
* @type {?number}
* @private
*/
this.opacity2_ = goog.isDef(opt_opacity2) ? opt_opacity2 : null;
};
goog.inherits(goog.graphics.LinearGradient, goog.graphics.Fill);
/**
* @return {number} The start X position of the gradient.
*/
goog.graphics.LinearGradient.prototype.getX1 = function() {
return this.x1_;
};
/**
* @return {number} The start Y position of the gradient.
*/
goog.graphics.LinearGradient.prototype.getY1 = function() {
return this.y1_;
};
/**
* @return {number} The end X position of the gradient.
*/
goog.graphics.LinearGradient.prototype.getX2 = function() {
return this.x2_;
};
/**
* @return {number} The end Y position of the gradient.
*/
goog.graphics.LinearGradient.prototype.getY2 = function() {
return this.y2_;
};
/**
* @override
*/
goog.graphics.LinearGradient.prototype.getColor1 = function() {
return this.color1_;
};
/**
* @override
*/
goog.graphics.LinearGradient.prototype.getColor2 = function() {
return this.color2_;
};
/**
* @return {?number} The start opacity of the gradient.
*/
goog.graphics.LinearGradient.prototype.getOpacity1 = function() {
return this.opacity1_;
};
/**
* @return {?number} The end opacity of the gradient.
*/
goog.graphics.LinearGradient.prototype.getOpacity2 = function() {
return this.opacity2_;
};
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