动态调整自定义C3片段图图例大小(使用D3?)
提问开始:
![]()
回答开始:得票数 0
我添加了一个使用名称、值和比率的自定义图例到C3片段图中。
目前使用固定宽度进行定位。有没有一种聪明的方法，比如使用D3，来动态计算图例行的像素宽度？
var columns = ['data11', 'data2', 'data347', 'data40091'];
var data = [150, 250, 300, 50];
var colors = ['#0065A3', '#767670', '#D73648', '#7FB2CE', '#00345B'];
var padding = 5;
var legendData = [];
var sumTotal = 0
//prepare pie data
var columnData = [];
var columnNames = {};
for (i = 0; i < columns.length; i++) {
columnData.push([columns[i]].concat(data[i]));
var val = (Array.isArray(data[i])) ? data[i].reduce(function(pv, cv) {
return pv + cv;
}, 0) : data[i];
sumTotal += val;
legendData.push({
id: columns[i],
value: val,
ratio: 0.0
});
}
legendData.forEach(function(el, i) {
el.ratio = el.value / sumTotal
columnNames[el.id] = [el.id, d3.format(",.0f")(el.value), d3.format(",.1%")(el.ratio)].join(';');
});
var chart = c3.generate({
bindto: d3.select('#chart'),
data: {
columns: [
[columns[0]].concat(data[0])
],
names: columnNames,
type: 'pie',
},
legend: {
position: 'right',
show: true
},
pie: {
label: {
threshold: 0.001,
format: function(value, ratio, id) {
return [id, d3.format(",.0f")(value), "[" + d3.format(",.1%")(ratio) + "]"].join(';');
}
}
},
color: {
pattern: colors
},
onrendered: function() {
redrawLabelBackgrounds();
redrawLegend();
}
});
function addLabelBackground(index) {
//get label text element
var textLabel = d3.select(".c3-target-" + columns[index] + " > text");
//add rect to parent
var labelNode = textLabel.node();
if (labelNode /*&& labelNode.innerHTML.length > 0*/ ) {
var p = d3.select(labelNode.parentNode).insert("rect", "text")
.style("fill", colors[index]);
}
}
for (var i = 0; i < columns.length; i++) {
if (i > 0) {
setTimeout(function(column) {
chart.load({
columns: [
columnData[column],
]
});
//chart.data.names(columnNames[column])
addLabelBackground(column);
}, (i * 5000 / columnData.length), i);
} else {
addLabelBackground(i);
}
}
function redrawLegend() {
d3.select('#chart').selectAll(".c3-legend-item > text").each(function(v) {
// get d3 node
var legendItem = d3.select(this);
legendItem.attr("style", "font-size: 8pt;");
var legendItemNode = legendItem.node();
//check if label is drawn
if (legendItemNode) {
if (legendItemNode.childElementCount === 0 && legendItemNode.innerHTML.length > 0) {
//build data
var data = legendItemNode.innerHTML.split(';');
legendItem.text("");
// TODO: size the "rows" dynamically
legendItem.append("tspan")
.text(data[0] + ": ")
.attr("class", "id-row")
.attr("text-anchor", "start");
legendItem.append("tspan")
.text(data[1] + " = ")
.attr("class", "value-row")
.attr("x", 170)
.attr("text-anchor", "end");
legendItem.append("tspan")
.text(data[2])
.attr("class", "ratio-row")
.attr("x", 200)
.attr("text-anchor", "end");
//.attr("transform", (n === 0) ? "translate(0,0)" : "translate(200,0)")
}
}
});
d3.select('#chart').selectAll(".c3-legend-item > rect").each(function(v) {
var legendItem = d3.select(this);
legendItem.attr("width", 170);
});
}
function redrawLabelBackgrounds() {
//for all label texts drawn yet
d3.select('#chart').selectAll(".c3-chart-arc > text").each(function(v) {
// get d3 node
var label = d3.select(this);
var labelNode = label.node();
//check if label is drawn
if (labelNode) {
if (labelNode.childElementCount === 0 && labelNode.innerHTML.length > 0) {
//build data
var data = labelNode.innerHTML.split(';');
label.text("");
data.forEach(function(i, n) {
label.append("tspan")
.text(i)
.attr("dy", (n === 0) ? 0 : "1.2em")
.attr("x", 0)
.attr("text-anchor", "middle");
}, label);
}
//check if element is visible
if (d3.select(labelNode.parentNode).style("display") !== 'none') {
//get pos of the label text
var pos = label.attr("transform").match(/-?\d+(\.\d+)?/g);
if (pos) {
//get surrounding box of the label
var bbox = labelNode.getBBox();
//now draw and move the rects
d3.select(labelNode.parentNode).select("rect")
.attr("transform", "translate(" + (pos[0] - (bbox.width + padding) / 2) +
"," + (pos[1] - bbox.height / labelNode.childElementCount) + ")")
.attr("width", bbox.width + padding)
.attr("height", bbox.height + padding);
}
}
}
});
}<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/5.7.0/d3.min.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/c3/0.6.9/c3.min.css" rel="stylesheet" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/c3/0.6.9/c3.min.js"></script>
<div id="chart">
</div>
这个问题基于我以前提出的关于自定义图例/标签重叠的问题：C3/D3 pie legend format / label overlap
我想出了如何解决这个问题，尽管可能有更聪明的解决方案。我现在使用每个tspan节点的"getComputedTextLength“来计算最大值。
var columns = ['data11', 'data2', 'data347', 'data40098'];
var data = [150, 250, 300, 50];
var colors = ['#0065A3', '#767670', '#D73648', '#7FB2CE', '#00345B'];
var padding = 5;
var legendData = [];
var sumTotal = 0
//prepare pie data
var columnData = [];
var columnNames = {};
for (i = 0; i < columns.length; i++) {
columnData.push([columns[i]].concat(data[i]));
var val = (Array.isArray(data[i])) ? data[i].reduce(function(pv, cv) {
return pv + cv;
}, 0) : data[i];
sumTotal += val;
legendData.push({
id: columns[i],
value: val,
ratio: 0.0
});
}
legendData.forEach(function(el, i) {
el.ratio = el.value / sumTotal
columnNames[el.id] = [el.id, d3.format(",.0f")(el.value), d3.format(",.1%")(el.ratio)].join(';');
});
var chart = c3.generate({
bindto: d3.select('#chart'),
data: {
columns: [
[columns[0]].concat(data[0])
],
names: columnNames,
type: 'pie',
},
legend: {
position: 'right',
show: true
},
pie: {
label: {
threshold: 0.001,
format: function(value, ratio, id) {
return [id, d3.format(",.0f")(value), "[" + d3.format(",.1%")(ratio) + "]"].join(';');
}
}
},
color: {
pattern: colors
},
onrendered: function() {
redrawLabelBackgrounds();
redrawLegend();
}
});
function addLabelBackground(index) {
//get label text element
var textLabel = d3.select(".c3-target-" + columns[index] + " > text");
//add rect to parent
var labelNode = textLabel.node();
if (labelNode /*&& labelNode.innerHTML.length > 0*/ ) {
var p = d3.select(labelNode.parentNode).insert("rect", "text")
.style("fill", colors[index]);
}
}
for (var i = 0; i < columns.length; i++) {
if (i > 0) {
setTimeout(function(column) {
chart.load({
columns: [
columnData[column],
]
});
//chart.data.names(columnNames[column])
addLabelBackground(column);
}, (i * 5000 / columnData.length), i);
} else {
addLabelBackground(i);
}
}
function redrawLegend() {
var maxIdRowWidth = 0,
maxValueRowWidth = 0,
maxRatioRowWidth = 0;
d3.select('#chart').selectAll(".c3-legend-item > text").each(function() {
// get d3 node
var legendItem = d3.select(this);
var legendItemNode = legendItem.node();
//check if label is drawn
if (legendItemNode) {
if (legendItemNode.childElementCount === 0 && legendItemNode.innerHTML.length > 0) {
//build data
var data = legendItemNode.innerHTML.split(';');
legendItem.text("");
var idRowWidth = legendItem.append("tspan")
.text(data[0] + ":")
.attr("class", "id-row")
.attr("text-anchor", "start")
.node().getComputedTextLength();
maxIdRowWidth = Math.max(maxIdRowWidth, idRowWidth);
var valueRowWidth = legendItem.append("tspan")
.text(data[1] + " =")
.attr("class", "value-row")
.attr("text-anchor", "end")
.node().getComputedTextLength();
maxValueRowWidth = Math.max(maxValueRowWidth, valueRowWidth);
var ratioRowWidth = legendItem.append("tspan")
.text(data[2])
.attr("class", "ratio-row")
.attr("text-anchor", "end")
.node().getComputedTextLength();
maxRatioRowWidth = Math.max(maxRatioRowWidth, ratioRowWidth);
}
}
});
var xOffset = parseInt(d3.select('#chart').select(".c3-legend-item > text").attr("x"));
var padding = 2;
d3.select('#chart').selectAll(".id-row")
.attr("width", Math.round(maxIdRowWidth));
d3.select('#chart').selectAll(".value-row")
.attr("x", Math.round(maxValueRowWidth+maxIdRowWidth)+xOffset+padding)
.attr("width", Math.round(maxValueRowWidth));
d3.select('#chart').selectAll(".ratio-row")
.attr("x", Math.round(maxValueRowWidth+maxIdRowWidth+maxRatioRowWidth)+xOffset+2*padding)
.attr("width", Math.round(maxRatioRowWidth));
d3.select('#chart').selectAll(".c3-legend-item > rect")
.attr("width", Math.round(maxValueRowWidth+maxIdRowWidth+maxRatioRowWidth));
}
function redrawLabelBackgrounds() {
//for all label texts drawn yet
d3.select('#chart').selectAll(".c3-chart-arc > text").each(function(v) {
// get d3 node
var label = d3.select(this);
var labelNode = label.node();
//check if label is drawn
if (labelNode) {
if (labelNode.childElementCount === 0 && labelNode.innerHTML.length > 0) {
//build data
var data = labelNode.innerHTML.split(';');
label.text("");
data.forEach(function(i, n) {
label.append("tspan")
.text(i)
.attr("dy", (n === 0) ? 0 : "1.2em")
.attr("x", 0)
.attr("text-anchor", "middle");
}, label);
}
//check if element is visible
if (d3.select(labelNode.parentNode).style("display") !== 'none') {
//get pos of the label text
var pos = label.attr("transform").match(/-?\d+(\.\d+)?/g);
if (pos) {
//get surrounding box of the label
var bbox = labelNode.getBBox();
//now draw and move the rects
d3.select(labelNode.parentNode).select("rect")
.attr("transform", "translate(" + (pos[0] - (bbox.width + padding) / 2) +
"," + (pos[1] - bbox.height / labelNode.childElementCount) + ")")
.attr("width", bbox.width + padding)
.attr("height", bbox.height + padding);
}
}
}
});
}<link href="https://cdnjs.cloudflare.com/ajax/libs/c3/0.6.12/c3.min.css" rel="stylesheet" />
<script src="https://d3js.org/d3.v5.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/c3/0.6.12/c3.min.js"></script>
<div id="chart">
</div>
你可能想看：