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在Techan.JS图表上加载旧数据

• 问答

我想根据用户需要加载旧的（以前的）数据。

概念是这样的：

  • 当用户第一次加载图表时，他会看到最近的数据
  • 然后，他可以从左向右拖动图表以检查以前的数据
  • 当他到达最后一个数据时，先进行检测，然后加载较旧的数据，将它们重新绘制到图表中，刷新缩放比例等等……

我的目标是在用户到达最后一个数据并拖动时检测事件，以便他显示前一个数据...我只需要检测该事件即可。

以下是我要应用更改的示例：

<!DOCTYPE html>
<meta charset="utf-8">
<style>

    body {
        font: 10px sans-serif;
    }

    text {
        fill: #000;
    }

    text.symbol {
        fill: #BBBBBB;
    }

    path {
        fill: none;
        stroke-width: 1;
    }

    path.candle {
        stroke: #000000;
    }

    path.candle.body {
        stroke-width: 0;
    }

    path.candle.up {
        fill: #00AA00;
        stroke: #00AA00;
    }

    path.candle.down {
        fill: #FF0000;
        stroke: #FF0000;
    }

    .close.annotation.up path {
        fill: #00AA00;
    }

    path.volume {
        fill: #DDDDDD;
    }

    .indicator-plot path.line {
        fill: none;
        stroke-width: 1;
    }

    .ma-0 path.line {
        stroke: #1f77b4;
    }

    .ma-1 path.line {
        stroke: #aec7e8;
    }

    .ma-2 path.line {
        stroke: #ff7f0e;
    }

    button {
        position: absolute;
        right: 110px;
        top: 25px;
    }

    path.macd {
        stroke: #0000AA;
    }

    path.signal {
        stroke: #FF9999;
    }

    path.zero {
        stroke: #BBBBBB;
        stroke-dasharray: 0;
        stroke-opacity: 0.5;
    }

    path.difference {
        fill: #BBBBBB;
        opacity: 0.5;
    }

    path.rsi {
        stroke: #000000;
    }

    path.overbought,path.oversold {
        stroke: #FF9999;
        stroke-dasharray: 5,5;
    }

    path.middle,path.zero {
        stroke: #BBBBBB;
        stroke-dasharray: 5,5;
    }

    .analysis path,.analysis circle {
        stroke: blue;
        stroke-width: 0.8;
    }

    .trendline circle {
        stroke-width: 0;
        display: none;
    }

    .mouseover .trendline path {
        stroke-width: 1.2;
    }

    .mouseover .trendline circle {
        stroke-width: 1;
        display: inline;
    }

    .dragging .trendline path,.dragging .trendline circle {
        stroke: darkblue;
    }

    .interaction path,.interaction circle {
        pointer-events: all;
    }

    .interaction .body {
        cursor: move;
    }

    .trendlines .interaction .start,.trendlines .interaction .end {
        cursor: nwse-resize;
    }

    .supstance path {
        stroke-dasharray: 2,2;
    }

    .supstances .interaction path {
        pointer-events: all;
        cursor: ns-resize;
    }

    .mouseover .supstance path {
        stroke-width: 1.5;
    }

    .dragging .supstance path {
        stroke: darkblue;
    }

    .crosshair {
        cursor: crosshair;
    }

    .crosshair path.wire {
        stroke: #DDDDDD;
        stroke-dasharray: 1,1;
    }

    .crosshair .axisannotation path {
        fill: #DDDDDD;
    }

    .tradearrow path.tradearrow {
        stroke: none;
    }

    .tradearrow path.buy {
        fill: #0000FF;
    }

    .tradearrow path.sell {
        fill: #9900FF;
    }

    .tradearrow path.highlight {
        fill: none;
        stroke-width: 2;
    }

    .tradearrow path.highlight.buy {
        stroke: #0000FF;
    }

    .tradearrow path.highlight.sell {
        stroke: #9900FF;
    }

</style>
<body>
<button>Reset</button>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="http://techanjs.org/techan.min.js"></script>
<script>

    var dim = {
        width: 960,height: 500,margin: { top: 20,right: 50,bottom: 30,left: 50 },ohlc: { height: 305 },indicator: { height: 65,padding: 5 }
    };
    dim.plot = {
        width: dim.width - dim.margin.left - dim.margin.right,height: dim.height - dim.margin.top - dim.margin.bottom
    };
    dim.indicator.top = dim.ohlc.height+dim.indicator.padding;
    dim.indicator.bottom = dim.indicator.top+dim.indicator.height+dim.indicator.padding;

    var indicatorTop = d3.scaleLinear()
            .range([dim.indicator.top,dim.indicator.bottom]);

    var parseDate = d3.timeParse("%d-%b-%y");

    var zoom = d3.zoom()
            .on("zoom",zoomed);

    var x = techan.scale.financetime()
            .range([0,dim.plot.width]);

    var y = d3.scaleLinear()
            .range([dim.ohlc.height,0]);


    var yPercent = y.copy();   // Same as y at this stage,will get a different domain later

    var yInit,yPercentInit,zoomableInit;

    var yVolume = d3.scaleLinear()
            .range([y(0),y(0.2)]);

    var candlestick = techan.plot.candlestick()
            .xScale(x)
            .yScale(y);

    var tradearrow = techan.plot.tradearrow()
            .xScale(x)
            .yScale(y)
            .y(function(d) {
                // Display the buy and sell arrows a bit above and below the price,so the price is still visible
                if(d.type === 'buy') return y(d.low)+5;
                if(d.type === 'sell') return y(d.high)-5;
                else return y(d.price);
            });

    var sma0 = techan.plot.sma()
            .xScale(x)
            .yScale(y);

    var sma1 = techan.plot.sma()
            .xScale(x)
            .yScale(y);

    var ema2 = techan.plot.ema()
            .xScale(x)
            .yScale(y);

    var volume = techan.plot.volume()
            .accessor(candlestick.accessor())   // Set the accessor to a ohlc accessor so we get highlighted bars
            .xScale(x)
            .yScale(yVolume);

    var trendline = techan.plot.trendline()
            .xScale(x)
            .yScale(y);

    var supstance = techan.plot.supstance()
            .xScale(x)
            .yScale(y);

    var xAxis = d3.axisBottom(x);

    var timeAnnotation = techan.plot.axisannotation()
            .axis(xAxis)
            .orient('bottom')
            .format(d3.timeFormat('%Y-%m-%d'))
            .width(65)
            .translate([0,dim.plot.height]);

    var yAxis = d3.axisRight(y);

    var ohlcAnnotation = techan.plot.axisannotation()
            .axis(yAxis)
            .orient('right')
            .format(d3.format(',.2f'))
            .translate([x(1),0]);

    var closeAnnotation = techan.plot.axisannotation()
            .axis(yAxis)
            .orient('right')
            .accessor(candlestick.accessor())
            .format(d3.format(',0]);

    var percentAxis = d3.axisLeft(yPercent)
            .tickFormat(d3.format('+.1%'));

    var percentAnnotation = techan.plot.axisannotation()
            .axis(percentAxis)
            .orient('left');

    var volumeAxis = d3.axisRight(yVolume)
            .ticks(3)
            .tickFormat(d3.format(",.3s"));

    var volumeAnnotation = techan.plot.axisannotation()
            .axis(volumeAxis)
            .orient("right")
            .width(35);

    var macdScale = d3.scaleLinear()
            .range([indicatorTop(0)+dim.indicator.height,indicatorTop(0)]);

    var rsiScale = macdScale.copy()
            .range([indicatorTop(1)+dim.indicator.height,indicatorTop(1)]);

    var macd = techan.plot.macd()
            .xScale(x)
            .yScale(macdScale);

    var macdAxis = d3.axisRight(macdScale)
            .ticks(3);

    var macdAnnotation = techan.plot.axisannotation()
            .axis(macdAxis)
            .orient("right")
            .format(d3.format(',0]);

    var macdAxisLeft = d3.axisLeft(macdScale)
            .ticks(3);

    var macdAnnotationLeft = techan.plot.axisannotation()
            .axis(macdAxisLeft)
            .orient("left")
            .format(d3.format(',.2f'));

    var rsi = techan.plot.rsi()
            .xScale(x)
            .yScale(rsiScale);

    var rsiAxis = d3.axisRight(rsiScale)
            .ticks(3);

    var rsiAnnotation = techan.plot.axisannotation()
            .axis(rsiAxis)
            .orient("right")
            .format(d3.format(',0]);

    var rsiAxisLeft = d3.axisLeft(rsiScale)
            .ticks(3);

    var rsiAnnotationLeft = techan.plot.axisannotation()
            .axis(rsiAxisLeft)
            .orient("left")
            .format(d3.format(',.2f'));

    var ohlcCrosshair = techan.plot.crosshair()
            .xScale(timeAnnotation.axis().scale())
            .yScale(ohlcAnnotation.axis().scale())
            .xAnnotation(timeAnnotation)
            .yAnnotation([ohlcAnnotation,percentAnnotation,volumeAnnotation])
            .verticalWireRange([0,dim.plot.height]);

    var macdCrosshair = techan.plot.crosshair()
            .xScale(timeAnnotation.axis().scale())
            .yScale(macdAnnotation.axis().scale())
            .xAnnotation(timeAnnotation)
            .yAnnotation([macdAnnotation,macdAnnotationLeft])
            .verticalWireRange([0,dim.plot.height]);

    var rsiCrosshair = techan.plot.crosshair()
            .xScale(timeAnnotation.axis().scale())
            .yScale(rsiAnnotation.axis().scale())
            .xAnnotation(timeAnnotation)
            .yAnnotation([rsiAnnotation,rsiAnnotationLeft])
            .verticalWireRange([0,dim.plot.height]);

    var svg = d3.select("body").append("svg")
            .attr("width",dim.width)
            .attr("height",dim.height);

    var defs = svg.append("defs");

    defs.append("clipPath")
            .attr("id","ohlcClip")
        .append("rect")
            .attr("x",0)
            .attr("y",0)
            .attr("width",dim.plot.width)
            .attr("height",dim.ohlc.height);

    defs.selectAll("indicatorClip").data([0,1])
        .enter()
            .append("clipPath")
            .attr("id",function(d,i) { return "indicatorClip-" + i; })
        .append("rect")
            .attr("x",i) { return indicatorTop(i); })
            .attr("width",dim.indicator.height);

    svg = svg.append("g")
            .attr("transform","translate(" + dim.margin.left + "," + dim.margin.top + ")");

    svg.append('text')
            .attr("class","symbol")
            .attr("x",20)
            .text("Facebook,Inc. (FB)");

    svg.append("g")
            .attr("class","x axis")
            .attr("transform","translate(0," + dim.plot.height + ")");

    var ohlcSelection = svg.append("g")
            .attr("class","ohlc")
            .attr("transform",0)");

    ohlcSelection.append("g")
            .attr("class","axis")
            .attr("transform","translate(" + x(1) + ",0)")
        .append("text")
            .attr("transform","rotate(-90)")
            .attr("y",-12)
            .attr("dy",".71em")
            .style("text-anchor","end")
            .text("Price ($)");

    ohlcSelection.append("g")
            .attr("class","close annotation up");

    ohlcSelection.append("g")
            .attr("class","volume")
            .attr("clip-path","url(#ohlcClip)");

    ohlcSelection.append("g")
            .attr("class","candlestick")
            .attr("clip-path","indicator sma ma-0")
            .attr("clip-path","indicator sma ma-1")
            .attr("clip-path","indicator ema ma-2")
            .attr("clip-path","percent axis");

    ohlcSelection.append("g")
            .attr("class","volume axis");

    var indicatorSelection = svg.selectAll("svg > g.indicator").data(["macd","rsi"]).enter()
             .append("g")
                .attr("class",function(d) { return d + " indicator"; });

    indicatorSelection.append("g")
            .attr("class","axis right")
            .attr("transform",0)");

    indicatorSelection.append("g")
            .attr("class","axis left")
            .attr("transform","translate(" + x(0) + ","indicator-plot")
            .attr("clip-path",i) { return "url(#indicatorClip-" + i + ")"; });

    // Add trendlines and other interactions last to be above zoom pane
    svg.append('g')
            .attr("class","crosshair ohlc");

    svg.append("g")
            .attr("class","tradearrow")
            .attr("clip-path","url(#ohlcClip)");

    svg.append('g')
            .attr("class","crosshair macd");

    svg.append('g')
            .attr("class","crosshair rsi");

    svg.append("g")
            .attr("class","trendlines analysis")
            .attr("clip-path","url(#ohlcClip)");
    svg.append("g")
            .attr("class","supstances analysis")
            .attr("clip-path","url(#ohlcClip)");

    d3.select("button").on("click",reset);

    d3.csv("data.csv",function(error,data) {
        var accessor = candlestick.accessor(),indicatorPreRoll = 33;  // Don't show where indicators don't have data

        data = data.map(function(d) {
            return {
                date: parseDate(d.Date),open: +d.Open,high: +d.High,low: +d.Low,close: +d.Close,volume: +d.Volume
            };
        }).sort(function(a,b) { return d3.ascending(accessor.d(a),accessor.d(b)); });

        x.domain(techan.scale.plot.time(data).domain());
        y.domain(techan.scale.plot.ohlc(data.slice(indicatorPreRoll)).domain());
        yPercent.domain(techan.scale.plot.percent(y,accessor(data[indicatorPreRoll])).domain());
        yVolume.domain(techan.scale.plot.volume(data).domain());

        var trendlineData = [
            { start: { date: new Date(2014,2,11),value: 72.50 },end: { date: new Date(2014,5,9),value: 63.34 } },{ start: { date: new Date(2013,10,21),value: 43 },17),value: 70.50 } }
        ];

        var supstanceData = [
            { start: new Date(2014,end: new Date(2014,value: 63.64 },{ start: new Date(2013,value: 55.50 }
        ];

        var trades = [
            { date: data[67].date,type: "buy",price: data[67].low,low: data[67].low,high: data[67].high },{ date: data[100].date,type: "sell",price: data[100].high,low: data[100].low,high: data[100].high },{ date: data[130].date,price: data[130].low,low: data[130].low,high: data[130].high },{ date: data[170].date,price: data[170].low,low: data[170].low,high: data[170].high }
        ];

        var macddata = techan.indicator.macd()(data);
        macdScale.domain(techan.scale.plot.macd(macddata).domain());
        var rsiData = techan.indicator.rsi()(data);
        rsiScale.domain(techan.scale.plot.rsi(rsiData).domain());

        svg.select("g.candlestick").datum(data).call(candlestick);
        svg.select("g.close.annotation").datum([data[data.length-1]]).call(closeAnnotation);
        svg.select("g.volume").datum(data).call(volume);
        svg.select("g.sma.ma-0").datum(techan.indicator.sma().period(10)(data)).call(sma0);
        svg.select("g.sma.ma-1").datum(techan.indicator.sma().period(20)(data)).call(sma1);
        svg.select("g.ema.ma-2").datum(techan.indicator.ema().period(50)(data)).call(ema2);
        svg.select("g.macd .indicator-plot").datum(macddata).call(macd);
        svg.select("g.rsi .indicator-plot").datum(rsiData).call(rsi);

        svg.select("g.crosshair.ohlc").call(ohlcCrosshair).call(zoom);
        svg.select("g.crosshair.macd").call(macdCrosshair).call(zoom);
        svg.select("g.crosshair.rsi").call(rsiCrosshair).call(zoom);
        svg.select("g.trendlines").datum(trendlineData).call(trendline).call(trendline.drag);
        svg.select("g.supstances").datum(supstanceData).call(supstance).call(supstance.drag);

        svg.select("g.tradearrow").datum(trades).call(tradearrow);

        // Stash for zooming
        zoomableInit = x.zoomable().domain([indicatorPreRoll,data.length]).copy(); // zoom in a little to hide indicator preroll
        yInit = y.copy();
        yPercentInit = yPercent.copy();

        draw();
    });

    function reset() {
        zoom.scale(1);
        zoom.translate([0,0]);
        draw();
    }

    function zoomed() {
        x.zoomable().domain(d3.event.transform.rescaleX(zoomableInit).domain());
        y.domain(d3.event.transform.rescaleY(yInit).domain());
        yPercent.domain(d3.event.transform.rescaleY(yPercentInit).domain());

        draw();
    }

    function draw() {
        svg.select("g.x.axis").call(xAxis);
        svg.select("g.ohlc .axis").call(yAxis);
        svg.select("g.volume.axis").call(volumeAxis);
        svg.select("g.percent.axis").call(percentAxis);
        svg.select("g.macd .axis.right").call(macdAxis);
        svg.select("g.rsi .axis.right").call(rsiAxis);
        svg.select("g.macd .axis.left").call(macdAxisLeft);
        svg.select("g.rsi .axis.left").call(rsiAxisLeft);

        // We know the data does not change,a simple refresh that does not perform data joins will suffice.
        svg.select("g.candlestick").call(candlestick.refresh);
        svg.select("g.close.annotation").call(closeAnnotation.refresh);
        svg.select("g.volume").call(volume.refresh);
        svg.select("g .sma.ma-0").call(sma0.refresh);
        svg.select("g .sma.ma-1").call(sma1.refresh);
        svg.select("g .ema.ma-2").call(ema2.refresh);
        svg.select("g.macd .indicator-plot").call(macd.refresh);
        svg.select("g.rsi .indicator-plot").call(rsi.refresh);
        svg.select("g.crosshair.ohlc").call(ohlcCrosshair.refresh);
        svg.select("g.crosshair.macd").call(macdCrosshair.refresh);
        svg.select("g.crosshair.rsi").call(rsiCrosshair.refresh);
        svg.select("g.trendlines").call(trendline.refresh);
        svg.select("g.supstances").call(supstance.refresh);
        svg.select("g.tradearrow").call(tradearrow.refresh);
    }

</script>

在此处找到完整的示例以及（data.csv）文件：

http://bl.ocks.org/andredumas/edf630690c10b89be390

因此，当用户拖动最后一个端点时，我将用另一个csv文件（data2.csv）等替换图表...

您的帮助将不胜感激。

chlinboy 回答：在Techan.JS图表上加载旧数据
暂时没有好的解决方案，如果你有好的解决方案，请发邮件至：iooj@foxmail.com
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