/**
 * @module zrender/shape/Heart
 * @author Kener (@Kener-林峰, kener.linfeng@gmail.com)
 * @example
 *   var Heart = require('zrender/shape/Heart');
 *   var shape = new Heart({
 *       style: {
 *           x: 100,
 *           y: 100,
 *           a: 40,
 *           b: 40,
 *           brushType: 'both',
 *           color: 'blue',
 *           strokeColor: 'red',
 *           lineWidth: 3,
 *           text: 'Heart'
 *       }    
 *   });
 *   zr.addShape(shape);
 */

/**
 * @typedef {Object} IHeartStyle
 * @property {number} x 心形内部尖端横坐标
 * @property {number} y 心形内部尖端纵坐标
 * @property {number} a 心形横宽（中轴线到水平边缘最宽处距离）
 * @property {number} b 心形纵高（内尖到外尖距离）
 * @property {string} [brushType='fill']
 * @property {string} [color='#000000'] 填充颜色
 * @property {string} [strokeColor='#000000'] 描边颜色
 * @property {string} [lineCape='butt'] 线帽样式，可以是 butt, round, square
 * @property {number} [lineWidth=1] 描边宽度
 * @property {number} [opacity=1] 绘制透明度
 * @property {number} [shadowBlur=0] 阴影模糊度，大于0有效
 * @property {string} [shadowColor='#000000'] 阴影颜色
 * @property {number} [shadowOffsetX=0] 阴影横向偏移
 * @property {number} [shadowOffsetY=0] 阴影纵向偏移
 * @property {string} [text] 图形中的附加文本
 * @property {string} [textColor='#000000'] 文本颜色
 * @property {string} [textFont] 附加文本样式，eg:'bold 18px verdana'
 * @property {string} [textPosition='end'] 附加文本位置, 可以是 inside, left, right, top, bottom
 * @property {string} [textAlign] 默认根据textPosition自动设置，附加文本水平对齐。
 *                                可以是start, end, left, right, center
 * @property {string} [textBaseline] 默认根据textPosition自动设置，附加文本垂直对齐。
 *                                可以是top, bottom, middle, alphabetic, hanging, ideographic
 */
module.exports = function (require) {
  'use strict';

  var Base = require('./Base');

  var PathProxy = require('./util/PathProxy');

  var area = require('../tool/area');
  /**
   * @alias module:zrender/shape/Heart
   * @constructor
   * @extends module:zrender/shape/Base
   * @param {Object} options
   */


  var Heart = function (options) {
    Base.call(this, options);
    this._pathProxy = new PathProxy();
    /**
     * 心形绘制样式
     * @name module:zrender/shape/Heart#style
     * @type {module:zrender/shape/Heart~IHeartStyle}
     */

    /**
     * 心形高亮绘制样式
     * @name module:zrender/shape/Heart#highlightStyle
     * @type {module:zrender/shape/Heart~IHeartStyle}
     */
  };

  Heart.prototype = {
    type: 'heart',

    /**
     * 创建扇形路径
     * @param {CanvasRenderingContext2D} ctx
     * @param {module:zrender/shape/Heart~IHeartStyle} style
     */
    buildPath: function (ctx, style) {
      var path = this._pathProxy || new PathProxy();
      path.begin(ctx);
      path.moveTo(style.x, style.y);
      path.bezierCurveTo(style.x + style.a / 2, style.y - style.b * 2 / 3, style.x + style.a * 2, style.y + style.b / 3, style.x, style.y + style.b);
      path.bezierCurveTo(style.x - style.a * 2, style.y + style.b / 3, style.x - style.a / 2, style.y - style.b * 2 / 3, style.x, style.y);
      path.closePath();
      return;
    },

    /**
     * 计算返回心形的包围盒矩形
     * @param {module:zrender/shape/Heart~IHeartStyle} style
     * @return {module:zrender/shape/Base~IBoundingRect}
     */
    getRect: function (style) {
      if (style.__rect) {
        return style.__rect;
      }

      if (!this._pathProxy.isEmpty()) {
        this.buildPath(null, style);
      }

      return this._pathProxy.fastBoundingRect();
    },
    isCover: function (x, y) {
      var originPos = this.transformCoordToLocal(x, y);
      x = originPos[0];
      y = originPos[1];

      if (this.isCoverRect(x, y)) {
        return area.isInsidePath(this._pathProxy.pathCommands, this.style.lineWidth, this.style.brushType, x, y);
      }
    }
  };

  require('../tool/util').inherits(Heart, Base);

  return Heart;
}(require);