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/**
* 折线
* @author Kener (@Kener-林峰, kener.linfeng@gmail.com)
* @module zrender/shape/Polyline
* @example
* var Polyline = require('zrender/shape/Polyline');
* var shape = new Polyline({
* style: {
* pointList: [[0, 0], [100, 100], [100, 0]],
* smooth: 'bezier',
* strokeColor: 'purple'
* }
* });
* zr.addShape(shape);
*/
/**
* @typedef {Object} IPolylineStyle
* @property {Array.<number>} pointList 顶点坐标数组
* @property {string} [smooth=''] 是否做平滑插值, 平滑算法可以选择 bezier, spline
* @property {number} [smoothConstraint] 平滑约束
* @property {string} [strokeColor='#000000'] 描边颜色
* @property {string} [lineCape='butt'] 线帽样式，可以是 butt, round, square
* @property {string} [lineJoin='miter'] 线段连接样式，可以是 miter, round, bevel
* @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 smoothSpline = require('./util/smoothSpline');
var smoothBezier = require('./util/smoothBezier');
var dashedLineTo = require('./util/dashedLineTo');
/**
* @alias module:zrender/shape/Polyline
* @constructor
* @extends module:zrender/shape/Base
* @param {Object} options
*/
var Polyline = function(options) {
this.brushTypeOnly = 'stroke'; // 线条只能描边，填充后果自负
this.textPosition = 'end';
Base.call(this, options);
/**
* 贝赛尔曲线绘制样式
* @name module:zrender/shape/Polyline#style
* @type {module:zrender/shape/Polyline~IPolylineStyle}
*/
/**
* 贝赛尔曲线高亮绘制样式
* @name module:zrender/shape/Polyline#highlightStyle
* @type {module:zrender/shape/Polyline~IPolylineStyle}
*/
};
Polyline.prototype = {
type: 'polyline',
/**
* 创建多边形路径
* @param {CanvasRenderingContext2D} ctx
* @param {module:zrender/shape/Polyline~IPolylineStyle} style
*/
buildPath : function(ctx, style) {
var pointList = style.pointList;
if (pointList.length < 2) {
// 少于2个点就不画了~
return;
}
var len = Math.min(
style.pointList.length,
Math.round(style.pointListLength || style.pointList.length)
);
if (style.smooth && style.smooth !== 'spline') {
var controlPoints = smoothBezier(
pointList, style.smooth, false, style.smoothConstraint
);
ctx.moveTo(pointList[0][0], pointList[0][1]);
var cp1;
var cp2;
var p;
for (var i = 0; i < len - 1; i++) {
cp1 = controlPoints[i * 2];
cp2 = controlPoints[i * 2 + 1];
p = pointList[i + 1];
ctx.bezierCurveTo(
cp1[0], cp1[1], cp2[0], cp2[1], p[0], p[1]
);
}
}
else {
if (style.smooth === 'spline') {
pointList = smoothSpline(pointList);
len = pointList.length;
}
if (!style.lineType || style.lineType == 'solid') {
// 默认为实线
ctx.moveTo(pointList[0][0], pointList[0][1]);
for (var i = 1; i < len; i++) {
ctx.lineTo(pointList[i][0], pointList[i][1]);
}
}
else if (style.lineType == 'dashed'
|| style.lineType == 'dotted'
) {
var dashLength = (style.lineWidth || 1)
* (style.lineType == 'dashed' ? 5 : 1);
ctx.moveTo(pointList[0][0], pointList[0][1]);
for (var i = 1; i < len; i++) {
dashedLineTo(
ctx,
pointList[i - 1][0], pointList[i - 1][1],
pointList[i][0], pointList[i][1],
dashLength
);
}
}
}
return;
},
/**
* 计算返回折线包围盒矩形。
* @param {IZRenderBezierCurveStyle} style
* @return {module:zrender/shape/Base~IBoundingRect}
*/
getRect : function(style) {
return require('./Polygon').prototype.getRect(style);
}
};
require('../tool/util').inherits(Polyline, Base);
return Polyline;
}
);