/**
 * 直线
 * @module zrender/shape/Line
 * @author Kener (@Kener-林峰, kener.linfeng@gmail.com)
 * @example
 *   var Line = require('zrender/shape/Line');
 *   var shape = new Line({
 *       style: {
 *           xStart: 0,
 *           yStart: 0,
 *           xEnd: 100,
 *           yEnd: 100,
 *           strokeColor: '#000',
 *           lineWidth: 10
 *       }
 *   });
 *   zr.addShape(line);
 */

/**
 * @typedef {Object} ILineStyle
 * @property {number} xStart 起点x坐标
 * @property {number} yStart 起点y坐标
 * @property {number} xEnd 终止点x坐标
 * @property {number} yEnd 终止点y坐标
 * @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) {
  var Base = require('./Base');

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


  var Line = function (options) {
    this.brushTypeOnly = 'stroke'; // 线条只能描边，填充后果自负

    this.textPosition = 'end';
    Base.call(this, options);
    /**
     * 直线绘制样式
     * @name module:zrender/shape/Line#style
     * @type {module:zrender/shape/Line~ILineStyle}
     */

    /**
     * 直线高亮绘制样式
     * @name module:zrender/shape/Line#highlightStyle
     * @type {module:zrender/shape/Line~ILineStyle}
     */
  };

  Line.prototype = {
    type: 'line',

    /**
     * 创建线条路径
     * @param {CanvasRenderingContext2D} ctx
     * @param {module:zrender/shape/Line~ILineStyle} style
     */
    buildPath: function (ctx, style) {
      if (!style.lineType || style.lineType == 'solid') {
        // 默认为实线
        ctx.moveTo(style.xStart, style.yStart);
        ctx.lineTo(style.xEnd, style.yEnd);
      } else if (style.lineType == 'dashed' || style.lineType == 'dotted') {
        var dashLength = (style.lineWidth || 1) * (style.lineType == 'dashed' ? 5 : 1);
        dashedLineTo(ctx, style.xStart, style.yStart, style.xEnd, style.yEnd, dashLength);
      }
    },

    /**
     * 计算返回线条的包围盒矩形
     * @param {module:zrender/shape/Line~ILineStyle} style
     * @return {module:zrender/shape/Base~IBoundingRect}
     */
    getRect: function (style) {
      if (style.__rect) {
        return style.__rect;
      }

      var lineWidth = style.lineWidth || 1;
      style.__rect = {
        x: Math.min(style.xStart, style.xEnd) - lineWidth,
        y: Math.min(style.yStart, style.yEnd) - lineWidth,
        width: Math.abs(style.xStart - style.xEnd) + lineWidth,
        height: Math.abs(style.yStart - style.yEnd) + lineWidth
      };
      return style.__rect;
    }
  };

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

  return Line;
}(require);