学习Javascript和D3。
尝试创建一个图形,在该图形中绘制一系列的每条线,一次绘制一次,也可以按延迟的间隔绘制一次。
到目前为止,我已经掌握了什么(本文末尾的相关代码)
https://jsfiddle.net/jimdholland/5n6xrLk0/180/
我的数据是每个系列为12行的结构。当您阅读它时,该对象看起来像
mydata = [
{NumDays01: "0", NumDays02: "0", NumDays03: "0", NumDays04: "0", NumDays05: "0",Numdays06: 30}
1: {NumDays01: "0", NumDays02: "0", NumDays03: "0", NumDays04: "0",...
]
我可以得到它来创建线,但是它可以一次绘制所有路径。同样,我尝试了一个循环,但是仍然可以一次绘制它们。还尝试了d3.timer和类似的结果。但是我很难理解计时器回调的内容并正确创建这些函数。
除了FlowingData的图表之外,我还没有找到另一个可以真正研究的示例,该图表在我的联赛中有很多风吹草动。 https://flowingdata.com/2019/02/01/how-many-kids-we-have-and-when-we-have-them/
任何帮助或提示都将不胜感激。
var svg = d3.select("#chart").select("svg"),
margin = { top: 30, right: 20, bottom: 10, left: 40 },
width = parseInt(d3.select("#chart").style('width'), 10) - margin.left - margin.right;
d3.tsv("https://s3.us-east-2.amazonaws.com/jamesdhollandwebfiles/data/improvementTest.tsv", function(error, data) {
if (error) throw error;
console.log(data);
myData = data;
var t = d3.timer(pathMaker);
}); // @end d3.tsv()
function pathMaker() {
var peeps = myData[rowToRun];
var coords = [];
var lineToRemove = [];
for (var nameIter in dayList) {
coords.push({ x: x(nameIter), y: y(peeps[dayList[nameIter]])})
}
var improvementPath = g.append("path")
.datum(coords)
.attr("id", "path" + peeps.caseid)
.attr("d", lineMaker)
.attr("stroke", "#90c6e4")
.attr("fill", "none")
.attr("stroke-width", 2);
var total_length = improvementPath.node().getTotalLength();
var startPoint = pathStartPoint(improvementPath);
improvementPath = improvementPath
.attr("stroke-dasharray", total_length + " " + total_length)
.attr("stroke-dashoffset", total_length)
.transition() // Call Transition Method
.duration(4000) // Set Duration timing (ms)
.ease(d3.easeLinear) // Set Easing option
.attr("stroke-dashoffset", 0); // Set final value of dash-offset for transition
rowToRun += 1;
if (rowToRun == 5) {rowToRun = 0;}
}
//Get path start point for placing marker
function pathStartPoint(Mypath) {
var d = Mypath.attr("d"),
dsplitted = d.split(/M|L/)[1];
return dsplitted;
}
答案 0 :(得分:1)
有一些问题。我尝试尽可能少地配置您的代码以使其正常工作。如果您需要进一步的解释,请告诉我
d3.tsv("https://s3.us-east-2.amazonaws.com/jamesdhollandwebfiles/data/improvementTest.tsv", function(error, data) {
if (error) throw error;
console.log(data);
myData = data;
pathMaker()
}); // @end d3.tsv()
function pathMaker() {
var peeps = myData[rowToRun];
var coords_data = [];
var lineToRemove = [];
for (let i = 0; i < myData.length; i++) {
var coords = [];
for (var nameIter in dayList) {
coords.push({ x: x(nameIter), y: y(myData[i][dayList[nameIter]])})
}
coords_data.push(coords)
}
console.log(coords_data)
var improvementPath = g.selectAll("path")
.data(coords_data)
.enter()
.append("path")
.attr("d", lineMaker)
.attr("stroke", "#90c6e4")
.attr("fill", "none")
.attr("stroke-width", 2);
improvementPath = improvementPath.each(function (d,i) {
var total_length = this.getTotalLength();
var startPoint = pathStartPoint(improvementPath);
const path = d3.select(this)
.attr("stroke-dasharray", total_length + " " + total_length)
.attr("stroke-dashoffset", total_length)
.transition() // Call Transition Method
.duration(4000) // Set Duration timing (ms)
.delay(i*4000)
.ease(d3.easeLinear) // Set Easing option
.attr("stroke-dashoffset", 0); // Set final value of dash-offset for transition
})
rowToRun += 1;
if (rowToRun == 5) {rowToRun = 0;}
}