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/**
* 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
*/
define(
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;
}
);