今天我们来画折线图 效果图
以下为模拟数据
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首先创建filterData方法 用于过滤数据 text文本 line线段 area圆 tag暂时用不到 今天说的是折线所以创建zrLine 方法
filterData(){ const data = chartData data.forEach(el => { switch (el.type) { case "text": // this.zrText(el) break; case "line": this.zrLine(el) break; case "area": this.zrPolyline(el) break; case "tag": this.zrTag(el) break; default: break; } }); }
我们在新增一个文件夹创建utli.js这个文件夹的作用为我们把创建线创建圆的公共方法写在这个js文件里
utli.js 我们先说 createLine createCircle
createLine 需要传5个参数分别为开始点的横纵坐标 结束点的横纵坐标 还有线的样式
createCircle 需要传4个参数分别为 圆点的横纵坐标 圆的半径 和样式
addHover 也需要 这时我们需要在init 方法里添加一段代码(上一章创建的初始化方法) 这段代码为创建一个div到时我们鼠标移到圆上会弹出文本信息的时候回用到
var div = document.createElement("div") div.classList.add("tips") document.getElementById("main").append(div)
utli.js
//线段 export const createLine = (x1,y1,x2,y2,style)=>{ return new zrender.Line({ shape:{ x1:x1, y1:y1, x2:x2, y2:y2 }, style:style, }); }; // cx 横坐标 cy纵坐标 r半径 空心圆 export const createCircle = (cx,cy,r,style)=>{ return new zrender.Circle({ shape:{ cx:cx, cy:cy, r:r }, style:style, zlevel:4 }) } //添加horver事件 el 元素对象 config 一些配置项 x x轴坐标 y y轴坐标 shapeOn鼠标移入一些属性配置 shapeOn鼠标移出一些属性配置 shape配置项看官网 export const addHover = (el,config,x,y,shapeOn,shapeOut) => { const domTips = document.getElementsByClassName("tips") el.on('mouseover',function(){ domTips[0].innerHTML = config.tips domTips[0].setAttribute("style",`position:absolute;top:${y-13}px;left:${x}px;display:block;font-size:10px;background-color:rgba(0,0,0,.7);padding:3px;border-radius:3px;color:#fff`) el.animateTo({ shape:shapeOn },100,0) }).on('mouseout',function () { domTips[0].setAttribute("style",`display:none`) el.animateTo({ shape:shapeOut },100,0) }) } //多边形 export const createPolygon = (points,style) => { return new zrender.Polyline({ shape:{ points:points, }, style:style }) }
zrLine方法里的第一段代码 判断这个折线拐点是需要空心圆还是实心圆还是其他的形状 都通过shape决定 color为圆的边框颜色填充色为白色 先定义一个style变量到时好实现自定义
var style = {} switch (data.shape) { case "x-circle": style = { stroke:data.color, fill:"#fff", text:"x", } break; case "empty-circle": style = { stroke:data.color, fill:"#fff", text:"", } break; default: break; }
这里需要在添加2个方法
getX
//获取X坐标 data当前时间点 getX(data){ let XShareOne = this.XShareOne() return data * XShareOne },
transformY
//转换y轴坐标点为正确坐标点 因为y轴坐标是顶点为0递增的 所有用总高度减去原来坐标的高度剩下的高度就是正确坐标点 //i代表一个格子代表几个高度 transformY(data,i){ let YHeight = this.YShareOne() //计算出剩余高度 let surplusHeight = this.canavsHeight - (YHeight/i) * data return surplusHeight },
这段代码意思是先把数据遍历出来 在通过time属性计算出x坐标 value值计算出y坐标 x轴左边基本是以time为基本来计算的 y轴坐标可能会随数据变化而有所改变 Break属性为是否断线 如果需要断线就位true
data.array.forEach((el,i) =>{ if (i > 0) { let XShareOne = this.XShareOne() let firstX = this.getX(data.array[i-1].time) let firstY = this.transformY(data.array[i-1].value,1) let x = this.getX(data.array[i].time) let y = this.transformY(data.array[i].value,1) if (data.array[i-1].Break == "false") { let line = createLine(firstX,firstY,x,y,{ stroke:"#af2377", lineWidth:2, }) this.zr.add(line) } } if (el.extraArr && el.extraArr.length > 0) { el.extraArr.forEach((item,a) => { let x = this.getX(el.time) let y = this.transformY(el.value,1) let lastY = this.transformY(item.extra,1) let dottedLine = createLine(x,y,x,lastY,{ stroke:"#af2377", lineWidth:2, lineDash:[2,2] }) this.zr.add(dottedLine) el.extraArr.forEach((item,a) => { let getY = this.transformY(item.extra,1) let Circle = createCircle(x,getY,5,{ stroke:item.extraColor, fill:"#fff", }) this.zr.add(Circle) addHover(Circle,{ tips:item.extraTips, },x,getY,{ r:8, },{ r:5, }) }) }) } let getX = this.getX(el.time) let getY = this.transformY(el.value,1) let Circle = createCircle(getX,getY,5,style) this.zr.add(Circle) addHover(Circle,el,getX,getY,{ r:8, },{ r:5, }) })
这步完成折线图应该就画好了
下次我们讲阴影的画法 