C3/d3 Pie Legend Format / Label Overlap
I have a piechart using C3. I have changed the default legend names by adding values and percentages and now. I am looking for a way to format this legend nicely so that the valu
Solution 1:
It is possible to create a custom legend. Then you can create & style it as you like in either SVG or HTML.
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 datavar 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);
});
var chart = c3.generate({
bindto: d3.select('#chart'),
data: {
columns: [
[columns[0]].concat(data[0])
],
names: columnNames,
type: 'pie',
},
legend: {
position: 'right',
show: false
},
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: redrawLabelBackgrounds
});
functionaddLabelBackground(index) {
//get label text elementvar textLabel = d3.select(".c3-target-" + columns[index] + " > text");
//add rect to parentvar 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);
}
}
functionredrawLabelBackgrounds() {
//for all label texts drawn yet//for all label texts drawn yet
d3.select('#chart').selectAll(".c3-chart-arc > text").each(function(v) {
// get d3 nodevar label = d3.select(this);
var labelNode = label.node();
//check if label is drawnif (labelNode) {
if (labelNode.childElementCount === 0 && labelNode.innerHTML.length > 0) {
//build datavar 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 visibleif (d3.select(labelNode.parentNode).style("display") !== 'none') {
//get pos of the label textvar pos = label.attr("transform").match(/-?\d+(\.\d+)?/g);
if (pos) {
// TODO: mofify the pos of the text// pos[0] = (pos[0]/h*90000);// pos[1] = (pos[1]/h*90000);// remove dy and move label//d3.select(this).attr("dy", 0);//d3.select(this).attr("transform", "translate(" + pos[0] + "," + pos[1] + ")");//get surrounding box of the labelvar 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);
}
}
}
});
}
//console.log(columnData)functiontoggle(id) {
chart.toggle(id);
}
var table = d3.select('#chart')
.append('table').attr('class', 'legend')
var row = table.selectAll('row').data(columnData)
var rowEnter = row.enter().append('tr').attr('class', 'legend-row')
rowEnter.append('td').attr('style', (d, i) =>`width: 20px;background-color:${colors[i]}`)
rowEnter.append('td').text(d => d[0])
rowEnter.append('td').text(d => d[1])
rowEnter.on('mouseover', function(id) {
if (!this.classList.contains('legend-row-disabled')) {
rowEnter.classed('legend-row-inactive', true)
chart.focus(id);
}
});
rowEnter.on('mouseout', function(id) {
rowEnter.classed('legend-row-inactive', false)
if (!this.classList.contains('legend-row-disabled')) {
chart.focus()
}
})
rowEnter.on('click', function(id) {
chart.toggle(id);
this.classList.toggle('legend-row-disabled');
chart.focus()
});.legend {
font: 12px sans-serif;
border-collapse: collapse;
}
.legend.legend-row {
cursor: pointer;
}
.legend.legend-rowtd:first-child {
width: 14px!important;
}
.legend.legend-row.legend-row-inactive {
opacity: 0.3;
}
.legend.legend-row.legend-row-inactive:hover {
opacity: 1.0;
}
.legend.legend-row.legend-row-disabled,
.legend.legend-row.legend-row-disabled:hover {
opacity: 0.2;
}
.legendtd {
padding: 5px;
}<scriptsrc="https://cdnjs.cloudflare.com/ajax/libs/d3/5.7.0/d3.min.js"></script><linkhref="https://cdnjs.cloudflare.com/ajax/libs/c3/0.6.9/c3.min.css" /><scriptsrc="https://cdnjs.cloudflare.com/ajax/libs/c3/0.6.9/c3.min.js"></script><divid="chart"></div>Solution 2:
I know I can add a custom legend but I want to use the original SVG legendand I added tspans now:
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 datavar 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();
}
});
functionaddLabelBackground(index) {
//get label text elementvar textLabel = d3.select(".c3-target-" + columns[index] + " > text");
//add rect to parentvar 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);
}
}
functionredrawLegend() {
d3.select('#chart').selectAll(".c3-legend-item > text").each(function(v) {
// get d3 nodevar legendItem = d3.select(this);
legendItem.attr("style", "font-size: 8pt;");
var legendItemNode = legendItem.node();
//check if label is drawnif (legendItemNode) {
if (legendItemNode.childElementCount === 0 && legendItemNode.innerHTML.length > 0) {
//build datavar data = legendItemNode.innerHTML.split(';');
legendItem.text("");
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);
});
}
functionredrawLabelBackgrounds() {
//for all label texts drawn yet
d3.select('#chart').selectAll(".c3-chart-arc > text").each(function(v) {
// get d3 nodevar label = d3.select(this);
var labelNode = label.node();
//check if label is drawnif (labelNode) {
if (labelNode.childElementCount === 0 && labelNode.innerHTML.length > 0) {
//build datavar 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 visibleif (d3.select(labelNode.parentNode).style("display") !== 'none') {
//get pos of the label textvar pos = label.attr("transform").match(/-?\d+(\.\d+)?/g);
if (pos) {
// TODO: mofify the pos of the text// pos[0] = (pos[0]/h*90000);// pos[1] = (pos[1]/h*90000);// remove dy and move label//d3.select(this).attr("dy", 0);//d3.select(this).attr("transform", "translate(" + pos[0] + "," + pos[1] + ")");//get surrounding box of the labelvar 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);
}
}
}
});
}<scriptsrc="https://cdnjs.cloudflare.com/ajax/libs/d3/5.7.0/d3.min.js"></script><linkhref="https://cdnjs.cloudflare.com/ajax/libs/c3/0.6.9/c3.min.css"rel="stylesheet" /><scriptsrc="https://cdnjs.cloudflare.com/ajax/libs/c3/0.6.9/c3.min.js"></script><divid="chart"></div>This solves the Problem #1 to 98% ;)
Now I only need to figue our how to calculate the width of the spans dynamically depending on the content the most elegant way.
(and #2 of course)
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