cake-chart
Interactive multi-layer pie chart
Demo
Install
> npm i -S cake-chart
Simple Example
import CakeChart from 'cake-chart';
const TREE = {
value: 100,
label: 'SUM = 100',
children: [{
value: 50,
children: [{
value: 10
},
{
value: 20
}]
}, {
value: 30
}, {
value: 20
}]
};
...
render () {
return (
<CakeChart data={TREE} />
);
}
Advanced Example
Tree Navigation
CakeChart is a quite dumb component that renders provided tree, but doesn't navigate through it, so you have to implement that part yourself. Which is not hard though.
const TREE = { ... };
/* finds parent of the selected node -
you can just store parent in the node itself, for example */
function findParentNode(node, child, parent = null) {
if (node === child) return parent;
for (let c of child.children || []) {
const p = findParent(node, c, child);
if (p) return p;
}
}
class InteractiveCakeChart extends React.Component {
constructor(props) {
super(props);
this.state = {
selectedNode: TREE
}
}
render() {
return (
<CakeChart data={this.state.selectedNode}
onClick={this.handleClick} />
);
}
handleClick = (node) => {
if (node === this.state.selectedNode) {
/* user clicked on the chart center - rendering parent node */
this.setState({ selectedNode: findParentNode(node, TREE) || TREE });
} else {
this.setState({ selectedNode: node });
}
}
}Customization
function getSliceProps(slice, props) {
return { ...props, fill: (slice.level % 2) ? '#FF0000' : '#0000FF' };
}
function getLabel(slice, label) {
return slice.level === 0 ? `Value: ${slice.node.value}` : label;
}
function getLabelProps(slice, props) {
return { ...props, style: { background: (slice.level % 2) ? '#FF0000' : '#0000FF' } };
}
class CustomizedCakeChart extends React.Component {
render() {
return (
<CakeChart data={TREE}
coreRadius={120}
ringWidth={80}
ringWidthFactor={0.6}
getSliceProps={getSliceProps}
getLabelProps={getLabelProps}
getLabel={getLabel} />
);
}
}