如果源json已更新(添加或删除项目),则动态更新D3 Sunburst

Question

我是D3的新手,如果修改了源json,我会尝试动态更新图表.但我无法做到这一点.

请检查这个plunkr

JS:

var width = 500,
    height = 500,
    radius = Math.min(width, height) / 2;

var x = d3.scale.linear()
    .range([0, 2 * Math.PI]);

var y = d3.scale.sqrt()
    .range([0, radius]);

var color = d3.scale.category10();

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height)
    .append("g")
    .attr("transform", "translate(" + width / 2 + "," + (height / 2 + 10) + ") rotate(-90 0 0)");

var partition = d3.layout.partition()
    .value(function(d) {
        return d.size;
    });

var arc = d3.svg.arc()
    .startAngle(function(d) {
        return Math.max(0, Math.min(2 * Math.PI, x(d.x)));
    })
    .endAngle(function(d) {
        return Math.max(0, Math.min(2 * Math.PI, x(d.x + d.dx)));
    })
    .innerRadius(function(d) {
        return Math.max(0, y(d.y));
    })
    .outerRadius(function(d) {
        return Math.max(0, y(d.y + d.dy));
    });

//d3.json("/d/4063550/flare.json", function(error, root) {
var root = initItems;

var g = svg.selectAll("g")
    .data(partition.nodes(root))
    .enter().append("g");

var path = g.append("path")
    .attr("d", arc)
    .style("fill", function(d) {
        return color((d.children ? d : d.parent).name);
    })
    .on("click", click)
    .each(function(d) {
        this.x0 = d.x;
        this.dx0 = d.dx;
    });


//.append("text")
var text = g.append("text")
    .attr("x", function(d) {
        return y(d.y);
    })
    .attr("dx", "6") // margin
    .attr("dy", ".35em") // vertical-align
    .attr("transform", function(d) {
        return "rotate(" + computeTextRotation(d) + ")";
    })
    .text(function(d) {
        return d.name;
    })
    .style("fill", "white");

function computeTextRotation(d) {
    var angle = x(d.x + d.dx / 2) - Math.PI / 2;
    return angle / Math.PI * 180;
}



function click(d) {
    console.log(d)
    // fade out all text elements
    if (d.size !== undefined) {
        d.size += 100;
    };
    text.transition().attr("opacity", 0);

    path.transition()
        .duration(750)
        .attrTween("d", arcTween(d))
        .each("end", function(e, i) {
            // check if the animated element's data e lies within the visible angle span given in d
            if (e.x >= d.x && e.x < (d.x + d.dx)) {
                // get a selection of the associated text element
                var arcText = d3.select(this.parentNode).select("text");
                // fade in the text element and recalculate positions
                arcText.transition().duration(750)
                    .attr("opacity", 1)
                    .attr("transform", function() {
                        return "rotate(" + computeTextRotation(e) + ")"
                    })
                    .attr("x", function(d) {
                        return y(d.y);
                    });
            }
        });
} //});

// Word wrap!
var insertLinebreaks = function(t, d, width) {
    alert(0)
    var el = d3.select(t);
    var p = d3.select(t.parentNode);
    p.append("g")
        .attr("x", function(d) {
            return y(d.y);
        })
        //    .attr("dx", "6") // margin
        //.attr("dy", ".35em") // vertical-align
        .attr("transform", function(d) {
            return "rotate(" + computeTextRotation(d) + ")";
        })
        //p
        .append("foreignObject")
        .attr('x', -width / 2)
        .attr("width", width)
        .attr("height", 200)
        .append("xhtml:p")
        .attr('style', 'word-wrap: break-word; text-align:center;')
        .html(d.name);
    alert(1)
    el.remove();
    alert(2)
};

//g.selectAll("text")
//    .each(function(d,i){ insertLinebreaks(this, d, 50 ); });


d3.select(self.frameElement).style("height", height + "px");

// Interpolate the scales!
function arcTween(d) {
    var xd = d3.interpolate(x.domain(), [d.x, d.x + d.dx]),
        yd = d3.interpolate(y.domain(), [d.y, 1]),
        yr = d3.interpolate(y.range(), [d.y ? 20 : 0, radius]);
    return function(d, i) {
        return i ? function(t) {
            return arc(d);
        } : function(t) {
            x.domain(xd(t));
            y.domain(yd(t)).range(yr(t));
            return arc(d);
        };
    };
}

function arcTweenUpdate(a) {
    console.log(path);
    var _self = this;
    var i = d3.interpolate({ x: this.x0, dx: this.dx0 }, a);
    return function(t) {
        var b = i(t);
        console.log(window);
        _self.x0 = b.x;
        _self.dx0 = b.dx;
        return arc(b);
    };
}

setTimeout(function() {
    path.data(partition.nodes(newItems))
        .transition()
        .duration(750)
        .attrTween("d", arcTweenUpdate)

}, 2000);

Answer 1

除了@Cyril建议删除以下行之外:

d3.select(self.frameElement).style("height", height + "px");

我对你的小提琴做了进一步的修改:工作小提琴

这里使用的想法是添加一个函数updateChart,它接受items然后生成图表:

var updateChart = function (items) {
    // code to update the chart with new items
}

updateChart(initItems);

setTimeout(function () { updateChart(newItems); }, 2000);

这不会使用arcTweenUpdate您创建的函数,但我将尝试解释基本概念:

首先,您需要JOIN使用现有数据获取新数据:

// DATA JOIN - Join new data with old elements, if any.
var gs = svg.selectAll("g").data(partition.nodes(root));

然后,ENTER根据需要创建新元素:

// ENTER
var g = gs.enter().append("g").on("click", click);

但是,我们还需要UPDATE现有的/ new path和text带有新数据的节点:

// UPDATE
var path = g.append("path");

 gs.select('path')
  .style("fill", function(d) {
      return color((d.children ? d : d.parent).name);
  })
  //.on("click", click)
  .each(function(d) {
      this.x0 = d.x;
      this.dx0 = d.dx;
  })
  .transition().duration(500)
  .attr("d", arc);


  var text = g.append("text");

  gs.select('text')
  .attr("x", function(d) {
      return y(d.y);
  })
  .attr("dx", "6") // margin
  .attr("dy", ".35em") // vertical-align
  .attr("transform", function(d) {
      return "rotate(" + computeTextRotation(d) + ")";
  })
  .text(function(d) {
      return d.name;
  })
  .style("fill", "white");

并且,在创建/更新所有内容后,删除g未使用的节点,即EXIT:

// EXIT - Remove old elements as needed.
gs.exit().transition().duration(500).style("fill-opacity", 1e-6).remove();

JOIN + ENTER + UPDATE + EXITMike Bostock在以下文章中展示了这整个模式:

1. 一般更新模式 - 我
2. 一般更新模式 - II
3. 一般更新模式 - III