plot - d3.js 缩放/拖动散点图

Question

我正在处理 d3.js 散点图，我希望它可以在不调整点大小的情况下进行缩放。我基于 http://static.cybercommons.org/js/d3/examples/zoom-pan/zoom-pan.html它具有可缩放的网格线，但到目前为止，我也无法获得要缩放的点。当我缩放/平移时，每个点都会返回以下控制台警报:

Unexpected value translate(NaN,0) parsing transform attribute.

你可以在这里看到完整的内容，下面是设计的截图(点击“在新窗口中打开”查看整个内容):
http://bl.ocks.org/242dcfc83d98743d8589

JS的简化版本在这里:

d3.csv("js/AllOccupations.csv", function(data) {

    var margin = {top: 30, right: 10, bottom: 50, left: 60},
        width = 960 - margin.left - margin.right,
        height = 500 - margin.top - margin.bottom;

    var xMax = d3.max(data, function(d) { return +d.TotalEmployed2011; }),
        xMin = 0,
        yMax = d3.max(data, function(d) { return +d.MedianSalary2011; }),
        yMin = 0;

    //Define scales
    var x = d3.scale.linear()
        .domain([xMin, xMax])
        .range([0, width]);

    var y = d3.scale.linear()
        .domain([yMin, yMax])
        .range([height, 0]);

    var colourScale = function(val){
        var colours = ['#9d3d38','#c5653a','#f9b743','#9bd6d7'];
        if (val > 30) {
            return colours[0];
        } else if (val > 10) {
            return colours[1];
        } else if (val > 0) {
            return colours[2];
        } else {
            return colours[3];
        }
    };


    //Define X axis
    var xAxis = d3.svg.axis()
        .scale(x)
        .orient("bottom")
        .tickSize(-height)
        .tickFormat(d3.format("s"));

    //Define Y axis
    var yAxis = d3.svg.axis()
        .scale(y)
        .orient("left")
        .ticks(5)
        .tickSize(-width)
        .tickFormat(d3.format("s"));

    var svg = d3.select("#chart").append("svg")
        .attr("width", width + margin.left + margin.right)
        .attr("height", height + margin.top + margin.bottom)
        .append("g")
        .attr("transform", "translate(" + margin.left + "," + margin.top + ")")
        .call(d3.behavior.zoom().x(x).y(y).scaleExtent([1, 8]).on("zoom", zoom));

    svg.append("rect")
        .attr("width", width)
        .attr("height", height);

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

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

    // Create points
    svg.selectAll("polygon")
        .data(data)
        .enter()
        .append("polygon")
        .attr("transform", function(d, i) {
            return "translate("+x(d.TotalEmployed2011)+","+y(d.MedianSalary2011)+")";
        })
        .attr('points','4.569,2.637 0,5.276 -4.569,2.637 -4.569,-2.637 0,-5.276 4.569,-2.637')
        .attr("opacity","0.8")
        .attr("fill",function(d) {
            return colourScale(d.ProjectedGrowth2020);
        });

    // Create X Axis label
    svg.append("text")
        .attr("class", "x label")
        .attr("text-anchor", "end")
        .attr("x", width)
        .attr("y", height + margin.bottom - 10)
        .text("Total Employment in 2011");

    // Create Y Axis label
    svg.append("text")
        .attr("class", "y label")
        .attr("text-anchor", "end")
        .attr("y", -margin.left)
        .attr("x", 0)
        .attr("dy", ".75em")
        .attr("transform", "rotate(-90)")
        .text("Median Annual Salary in 2011 ($)");


    function zoom() {
      svg.select(".x.axis").call(xAxis);
      svg.select(".y.axis").call(yAxis);
    }
});

任何帮助将不胜感激。

Answer 1

示例中的网格线实际上是轴刻度!所以你会注意到你的缩放功能会在鼠标事件上更新它们，但你永远不会更新点的位置。您应该将点定位线复制到缩放功能中(或将其分解为单独的功能)。

这是我的样子:

function zoom() {
    svg.select(".x.axis").call(xAxis);
    svg.select(".y.axis").call(yAxis);
    svg.selectAll("polygon")
        .attr("transform", function(d, i) {
            return "translate("+x(d.TotalEmployed2011)+","+y(d.MedianSalary2011)+")";
        })
        .attr('points','4.569,2.637 0,5.276 -4.569,2.637 -4.569,-2.637 0,-5.276 4.569,-2.637');
}

你可以试试 here