我正在尝试创建一种散点图形式。我有一个自定义的 x 轴和两个 a 轴的特定比例。我也为它实现了缩放功能。到目前为止一切都很好，但是当我最终尝试将我的数据绘制为圆圈时，出现了两个错误:

.

我的图可以在这个网站上看到:http://servers.binf.ku.dk/hemaexplorerbeta/ (圆圈很大，因为我想确保在设计它们之前大致知道它们的位置)

我根据从 MYSQL 服务器读取的数据创建我的圈子。我检查了我所有的数据，数字是正确的。他们要么绘制错误，要么我的比例/缩放有问题。

您可能还会注意到，我最初使用一些值创建轴和比例，然后立即在某些函数中更改它们。这是因为我计划在网站上加载一个空图，用户可以在其中决定要加载的数据集，其中的函数必须为要加载的数据自定义比例和轴。

我已经在下面粘贴了我的源代码:

    //Setting generic width and height values for our SVG.
    var margin = {top: 60, right: 0, bottom: 70, left: 40},

        genWidth = 1024;
        genHeight = 768;

        width = genWidth - 70 - margin.left - margin.right,
        height = genHeight - 100 - margin.top - margin.bottom;

     //Other variable declarations.
     var valueY = 0;
     var graphData = Array();


    //Creating scales used to scale everything to the size of the SVG.
    var xScale = d3.scale.linear()
        .domain([0, genWidth])
        .range([0, width-margin.right]);

    var yScale = d3.scale.linear()
        .domain([0, genHeight])
        .range([height, margin.bottom]);

    var xAxis = d3.svg.axis()
        .scale(xScale)
        .orient("bottom");

    var yAxis = d3.svg.axis()
        .scale(yScale)
        .orient("left");

    //Zoom command ...
    var zoom = d3.behavior.zoom()
        .x(xScale)
        .y(yScale)
        .scaleExtent([1,10])
        .on("zoom", zoomTargets);

    // The mark '#' indicates an ID. IF '#' isn't included argument expected is a tag such as "svg" or "p" etc..
    var SVG = d3.select("#mainSVG")
                .attr("class", "SVG")
                .attr("width", width + margin.left + margin.right)
                .attr("height", height + margin.top + margin.bottom)
                .attr("pointer-events", "all")
                .append("g")
                .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

    //This creates a body with a clippath inside the svg where all element in the graph will be. This prevents elemnts on the graph to go past the axis.
    var SVGbody = SVG.append("g")
        .attr("clip-path", "url(#clip)")
        .call(zoom);


    //Create background. The mouse must be over an object on the graph for the zoom to work. The rectangle will cover the entire graph.
    var rect = SVGbody.append("rect")
        .attr("width", width)
        .attr("height", height);

    //Showing the axis that we created earlier in the script for both X and Y.
    SVG.append("g")
        .attr("class", "x axis")
        .attr("transform", "translate(0," + height + ")")
        .call(xAxis)
            .selectAll("text")
                .style("text-anchor", "end")
                .attr("transform", function(d) {
                return "rotate(-30)" 
                });;

    SVG.append("g")
        .attr("class", "y axis")
        .call(yAxis);


    d3.json("getdata.php?type=load&gene=CCL5&data=human", function(error, data) {
        var arrayValues = [];
        if(error){ return console.log(error); }

        data.forEach( function(d) { 
            arrayValues.push(d.gene_name);
            valueY = getValueY(d.gene_data);
            var string = JSON.stringify(d.gene_data);
            graphData.push(string.split(" "));
        });

        //console.log(graphData);

        arrayValues = removeDuplicatesInPlace(arrayValues);
        updateScaleX(arrayValues.length);
        updateAxisX(arrayValues);
        //console.log(arrayValues);

        updateScaleY(valueY);

        //This selects 4 circles (non-existent, there requires data-binding) and appends them all below enter.
        //The amount of numbers in data is the amount of circles to be appended in the enter() section. 
        for(var i = 0;i <= graphData.length;i++){
            var circle = SVGbody
                .selectAll("circle")
                .data(graphData[i])
                .enter()
                    .append("circle")
                    .attr("cx",function(d){return xScale((i*100)+100);})
                    .attr("cy",function(d){return yScale(d)})
                    .attr("r",20);
        }



    });

    //Clipping is defined here used to prevent elements from the graph from going past the axis.
    var clip = SVG.append("defs").append("svg:clipPath")
        .attr("id", "clip")
        .append("svg:rect")
        .attr("id", "clip-rect")
        .attr("x", "0")
        .attr("y", "0")
        .attr("width", width)
        .attr("height", height);

    //Resets zoom when click on circle object. Zoom work now, should be changed to a button instead of click on circle though.
    SVG.selectAll("circle").on("click", function() {
        zoom.scale(1);
        zoom.translate([0,0]);
        zoomTargets();
    });

    //The function handleling the zoom. Nothing is zoomed automatically, every elemnt must me defined here.
    function zoomTargets() {

        var translate = zoom.translate(),
        scale = zoom.scale();

        tx = Math.min(0, Math.max(width * (1 - scale), translate[0]));
        ty = Math.min(0, Math.max(height * (1 - scale), translate[1]));

        //This line applies the tx and ty which prevents the graphs from moving out of the limits. This means it can't be moved until zoomed in first.
        zoom.translate([tx, ty]);

        SVG.select(".x.axis").call(xAxis)
            .selectAll("text")
                .style("text-anchor", "end")
                .attr("transform", function(d) {
                return "rotate(-30)" 
                });
        SVG.select(".y.axis").call(yAxis);
        SVG.selectAll("circle").attr("cx",function(d){return xScale(d)}).attr("cy",function(d){return yScale(d)});
    }

    function resetZoom() {
        zoom.scale(1); 
        zoom.translate([0,0]);
        zoomTargets();
    }

    function updateAxisX(arr) {
        var formatAxis = function(d, i) { return arr[i]; }

        xAxis = d3.svg.axis()
            .scale(xScale)
            .orient("bottom")
            .tickValues(createTickValuesArray(arr.length))
            .tickFormat(formatAxis);

        SVG.select(".x.axis")
            .call(xAxis)
            .selectAll("text")
                .style("text-anchor", "end")
                .attr("transform", function(d) {
                return "rotate(-30)" 
                });
    }

    function updateScaleX(newWidth){

        genWidth = newWidth;
        xScale = d3.scale.linear()
            .domain([0, (newWidth*100)+50])
            .range([0, width-margin.right]);

        SVG.selectAll("circle").attr("cx",function(d){return xScale(d)}).attr("cy",function(d){return yScale(d)});
        zoom.x(xScale);
    }

    function updateScaleY(newHeight){

        console.log(newHeight);
        var yScale = d3.scale.linear()
            .domain([0, newHeight])
            .range([height, margin.bottom]);

        yAxis = d3.svg.axis()
            .scale(yScale)
            .orient("left");

        SVG.select(".y.axis").call(yAxis);
        SVG.selectAll("circle").attr("cx",function(d){return xScale(d)}).attr("cy",function(d){return yScale(d)});
        zoom.y(yScale);
    }

    function createTickValuesArray(amountOfTicks){
        var tickValuesArr = [];
        for(var i = 1;i<=amountOfTicks;i++){
            tickValuesArr[i-1] = 100*i;
        }
        return tickValuesArr;
    }

    function getValueY(coordinates){
        return d3.max(coordinates, Number);
    }

     //Custom functions used for specific uses.
    var removeDuplicatesInPlace = function (arr) {
        var i, j, cur, found;
        for (i = arr.length - 1; i >= 0; i--) {
            cur = arr[i];
            found = false;
            for (j = i - 1; !found && j >= 0; j--) {
                if (cur === arr[j]) {
                    if (i !== j) {
                        arr.splice(i, 1);
                    }
                    found = true;
                }
            }
        }
        return arr;
    };

最佳答案

graphData 中每个数组的第一个和最后一个元素在解析为数字时由于附加引号而导致错误
例如，graphData 的第七个数组如下所示:

console.log(graphData[6])    // [""5.149230", "4.965121""]

原因似乎是在获取数据时不必要的 JSON.stringfiy() 调用

d3.json("getdata.php?type=load&gene=CCL5&data=human", function(error, data) {
    var arrayValues = [];
    if(error){ return console.log(error); }

    data.forEach( function(d) { 
        arrayValues.push(d.gene_name);
        valueY = getValueY(d.gene_data);
        var string = JSON.stringify(d.gene_data);    // <-- this one
        graphData.push(string.split(" "));
    });

d.gene_data 已经是一个字符串，因此当您删除 JSON.stringify()

关于javascript - 使用 D3.js 的 <circle> 属性 cx =“NaN” 的值无效，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/22846599/