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

/**
 * @typedef {Object} ICircleStyle
 * @property {number} x 圆心x坐标
 * @property {number} y 圆心y坐标
 * @property {number} r 半径
 * @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');
  /**
   * @alias module:zrender/shape/Circle
   * @constructor
   * @extends module:zrender/shape/Base
   * @param {Object} options
   */


  var Circle = function (options) {
    Base.call(this, options);
    /**
     * 圆形绘制样式
     * @name module:zrender/shape/Circle#style
     * @type {module:zrender/shape/Circle~ICircleStyle}
     */

    /**
     * 圆形高亮绘制样式
     * @name module:zrender/shape/Circle#highlightStyle
     * @type {module:zrender/shape/Circle~ICircleStyle}
     */
  };

  Circle.prototype = {
    type: 'circle',

    /**
     * 创建圆形路径
     * @param {CanvasRenderingContext2D} ctx
     * @param {module:zrender/shape/Circle~ICircleStyle} style
     */
    buildPath: function (ctx, style) {
      // Better stroking in ShapeBundle
      ctx.moveTo(style.x + style.r, style.y);
      ctx.arc(style.x, style.y, style.r, 0, Math.PI * 2, true);
      return;
    },

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

      var lineWidth;

      if (style.brushType == 'stroke' || style.brushType == 'fill') {
        lineWidth = style.lineWidth || 1;
      } else {
        lineWidth = 0;
      }

      style.__rect = {
        x: Math.round(style.x - style.r - lineWidth / 2),
        y: Math.round(style.y - style.r - lineWidth / 2),
        width: style.r * 2 + lineWidth,
        height: style.r * 2 + lineWidth
      };
      return style.__rect;
    }
  };

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

  return Circle;
}(require);