pie = d3
.pie()
.value(function (d) {
return d;
})
.sort(null)
arc = d3
.arc()
.innerRadius(100 - 20)
.outerRadius(100)
d = pie([1])
arc(d[0])
pieChart = {
const pie = new PieChart()
.container(chartContainer)
.svgHeight(400)
.data(apples)
.render();
setInterval((d) => {
pie.data(apples.map((d) => d * Math.random())).render();
}, 1000);
return pie;
}
class PieChart {
constructor() {
const attrs = {
id: "ID" + Math.floor(Math.random() * 1000000),
svgWidth: 400,
svgHeight: 200,
marginTop: 5,
marginBottom: 5,
marginRight: 5,
marginLeft: 5,
container: "body",
defaultTextFill: "#2C3E50",
defaultFont: "Helvetica",
data: null,
chartWidth: null,
chartHeight: null
};
this.getState = () => attrs;
this.setState = (d) => Object.assign(attrs, d);
Object.keys(attrs).forEach((key) => {
//@ts-ignore
this[key] = function (_) {
var string = `attrs['${key}'] = _`;
if (!arguments.length) {
return eval(`attrs['${key}'];`);
}
eval(string);
return this;
};
});
this.initializeEnterExitUpdatePattern();
}
initializeEnterExitUpdatePattern() {
d3.selection.prototype._add = function (params) {
var container = this;
var className = params.className;
var elementTag = params.tag;
var data = params.data || [className];
var exitTransition = params.exitTransition || null;
var enterTransition = params.enterTransition || null;
// Pattern in action
var selection = container
.selectAll("." + className)
.data(data, (d, i) => {
if (typeof d === "object") {
if (d.id) {
return d.id;
}
}
return i;
});
if (exitTransition) {
exitTransition(selection);
} else {
selection.exit().remove();
}
const enterSelection = selection.enter().append(elementTag);
if (enterTransition) {
enterTransition(enterSelection);
}
selection = enterSelection.merge(selection);
selection.attr("class", className);
return selection;
};
}
// ================== RENDERING ===================
render() {
this.setDynamicContainer();
this.calculateProperties();
this.drawSvgAndWrappers();
this.drawChart();
return this;
}
drawChart() {
const { chart, data, chartHeight, chartWidth } = this.getState();
var width = chartWidth,
height = chartHeight,
radius = Math.min(width, height) / 2;
var color = d3.schemeCategory10;
var pie = d3
.pie()
.value(function (d) {
return d;
})
.sort(null);
var arc = d3
.arc()
.innerRadius(radius - 20)
.outerRadius(radius);
var path = chart.selectAll("path").data(pie(data));
var pathEnter = path
.enter()
.append("path")
.attr("fill", function (d, i) {
return color[i];
})
.each(function (d) {
this._current = d;
});
path = path.merge(pathEnter);
path.exit().remove();
path.transition().duration(750).attrTween("d", arcTween);
// Store the displayed angles in _current.
// Then, interpolate from _current to the new angles.
// During the transition, _current is updated in-place by d3.interpolate.
function arcTween(a) {
var i = d3.interpolate(this._current, a);
this._current = i(0);
return function (t) {
console.log({ t, i, a, current: this._current, this: this });
return arc(i(t));
};
}
}
setDynamicContainer() {
const attrs = this.getState();
//Drawing containers
var d3Container = d3.select(attrs.container);
var containerRect = d3Container.node().getBoundingClientRect();
if (containerRect.width > 0) attrs.svgWidth = containerRect.width;
d3.select(window).on("resize." + attrs.id, (d) => {
var containerRect = d3Container.node().getBoundingClientRect();
if (containerRect.width > 0) attrs.svgWidth = containerRect.width;
this.render();
});
this.setState({ d3Container });
}
drawSvgAndWrappers() {
const {
d3Container,
svgWidth,
svgHeight,
defaultFont,
calc,
data,
chartWidth,
chartHeight
} = this.getState();
// Draw SVG
const svg = d3Container
._add({
tag: "svg",
className: "svg-chart-container"
})
.attr("width", svgWidth)
.attr("height", svgHeight)
.attr("font-family", defaultFont);
//Add container g element
var chart = svg
._add({
tag: "g",
className: "chart"
})
.attr(
"transform",
"translate(" +
(calc.chartLeftMargin + chartWidth / 2) +
"," +
(calc.chartTopMargin + chartHeight / 2) +
")"
);
this.setState({ chart, svg });
}
calculateProperties() {
const {
marginLeft,
marginTop,
marginRight,
marginBottom,
svgWidth,
svgHeight
} = this.getState();
//Calculated properties
var calc = {
id: null,
chartTopMargin: null,
chartLeftMargin: null,
chartWidth: null,
chartHeight: null
};
calc.id = "ID" + Math.floor(Math.random() * 1000000); // id for event handlings
calc.chartLeftMargin = marginLeft;
calc.chartTopMargin = marginTop;
const chartWidth = svgWidth - marginRight - calc.chartLeftMargin;
const chartHeight = svgHeight - marginBottom - calc.chartTopMargin;
this.setState({ calc, chartWidth, chartHeight });
}
}
d3 = require('d3')
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