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103 lines
3.3 KiB
103 lines
3.3 KiB
/**
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* zrender
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*
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* @author Kener (@Kener-林峰, kener.linfeng@gmail.com)
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*
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* shape类：支持半平滑的polygon，折线面积图使用
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* 可配图形属性：
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{
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// 基础属性
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shape : 'halfSmoothPolygon', // 必须，shape类标识，需要显式指定
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id : {string}, // 必须，图形唯一标识，可通过'zrender/tool/guid'方法生成
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zlevel : {number}, // 默认为0，z层level，决定绘画在哪层canvas中
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invisible : {boolean}, // 默认为false，是否可见
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// 样式属性，默认状态样式样式属性
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style : {
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pointList : {Array}, // 必须，多边形各个顶角坐标
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},
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// 样式属性，高亮样式属性，当不存在highlightStyle时使用基于默认样式扩展显示
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highlightStyle : {
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// 同style
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}
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// 交互属性，详见shape.Base
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// 事件属性，详见shape.Base
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}
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例子：
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{
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shape : 'halfSmoothPolygon',
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id : '123456',
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zlevel : 1,
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style : {
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pointList : [[10, 10], [300, 20], [298, 400], [50, 450]]
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color : '#eee',
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text : 'Baidu'
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},
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myName : 'kener', // 可自带任何有效自定义属性
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clickable : true,
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onClick : function (eventPacket) {
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alert(eventPacket.target.myName);
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}
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}
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*/
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define(function (require) {
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var Base = require('zrender/shape/Base');
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var smoothBezier = require('zrender/shape/util/smoothBezier');
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var zrUtil = require('zrender/tool/util');
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function HalfSmoothPolygon(options) {
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Base.call(this, options);
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}
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HalfSmoothPolygon.prototype = {
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type : 'half-smooth-polygon',
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/**
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* 创建多边形路径
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* @param {Context2D} ctx Canvas 2D上下文
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* @param {Object} style 样式
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*/
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buildPath : function (ctx, style) {
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var pointList = style.pointList;
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if (pointList.length < 2) {
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// 少于2个点就不画了~
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return;
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}
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if (style.smooth) {
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var controlPoints = smoothBezier(
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pointList.slice(0, -2), style.smooth, false, style.smoothConstraint
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);
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ctx.moveTo(pointList[0][0], pointList[0][1]);
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var cp1;
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var cp2;
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var p;
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var l = pointList.length;
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for (var i = 0; i < l - 3; i++) {
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cp1 = controlPoints[i * 2];
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cp2 = controlPoints[i * 2 + 1];
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p = pointList[i + 1];
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ctx.bezierCurveTo(
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cp1[0], cp1[1], cp2[0], cp2[1], p[0], p[1]
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);
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}
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ctx.lineTo(pointList[l - 2][0], pointList[l - 2][1]);
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ctx.lineTo(pointList[l - 1][0], pointList[l - 1][1]);
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ctx.lineTo(pointList[0][0], pointList[0][1]);
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}
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else {
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require('zrender/shape/Polygon').prototype.buildPath(
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ctx, style
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);
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}
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return;
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}
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};
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zrUtil.inherits(HalfSmoothPolygon, Base);
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return HalfSmoothPolygon;
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});
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