Javascript d3.js动画线条绘制按预期的相反方向进行
我在d3.js中有一个简单的线图,我希望为线的绘制设置动画。小提琴:。动画方面的工作,但我希望线是从左到右,而不是从右到左的小提琴。为什么这条线是从结尾到开头而不是从反面画出来的Javascript d3.js动画线条绘制按预期的相反方向进行,javascript,svg,d3.js,Javascript,Svg,D3.js,我在d3.js中有一个简单的线图,我希望为线的绘制设置动画。小提琴:。动画方面的工作,但我希望线是从左到右,而不是从右到左的小提琴。为什么这条线是从结尾到开头而不是从反面画出来的 /*canvas setup*/ var margin = {top: 20, right: 20, bottom: 70, left: 100}, width = 960 - margin.left - margin.right, height = 500 - marg
/*canvas setup*/
var margin = {top: 20, right: 20, bottom: 70, left: 100},
width = 960 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;
var svg = d3.select("body").append("svg").attr("id","chart")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("class","container")
.attr("transform",translate(margin.left,margin.bottom));
function translate(a,b){
return "translate(" + a + "," + b + ")";
}
/*data*/
var data = [{
"time": "2013-03-12 15:09:04",
"value": "5"
}, {
"time": "2013-03-12 14:59:06",
"value": "65"
}, {
"time": "2013-03-12 14:49:04",
"value": "15"
}, {
"time": "2013-03-12 14:39:06",
"value": "25"
},{
"time": "2013-03-12 14:29:03",
"value": "5"
}];
/*end data*/
var parseDate = d3.time.format("%Y-%m-%d %H:%M:%S").parse;
data.forEach(function(d) {
d.time = parseDate(d.time);
d.value = +d.value;
});
//create scales
var xScale = d3.time.scale()
.range([0,width])
.domain(d3.extent(data,function(d){ return d.time})),
yScale = d3.scale.linear()
.range([height,0])
.domain([0,d3.max(data,function(d){ return +d.value})]);
//create axes
var xAxis = d3.svg.axis()
.scale(xScale)
.orient("bottom")
.tickFormat(d3.time.format("%H:%m"));
//create line
var line = d3.svg.line()
.x(function(d){return xScale(d.time)})
.y(function(d){ return yScale(d.value)});
var _line; //path that will be appended to the chart
var yAxis = d3.svg.axis()
.scale(yScale)
.orient("left");
var _x = svg.append("g")
.attr("class","xAxis")
.attr("transform",translate(0,height))
.call(xAxis);
var _y = svg.append("g")
.attr("class","yAxis")
.call(yAxis);
//draw line
function drawLine(){
_line = svg.append("path")
.attr("d", line(data))
.attr("stroke", "steelblue")
.attr("stroke-width", "2")
.attr("fill", "none");
var totalLength = _line.node().getTotalLength();
_line.attr("stroke-dasharray", totalLength + " " + totalLength)
.attr("stroke-dashoffset", totalLength)
.transition()
.duration(750)
.ease("swing")
.attr("stroke-dashoffset", 0);
}
setTimeout(function(){
drawLine();
},500)
该行是从右侧设置动画的,因为从偏移量
totalLength
设置动画为0。因此,动画起点是:线从终点开始,动画终点是线从实际起点开始。
您只需通过设置.attr(“stroke dashoffset”,-totalLength)来改变此逻辑,使其以负偏移量开始
我用这个小改动更新了你的