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Limit zooming out when the chart is small

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This commit is contained in:
Przemek Wiech 2020-03-14 23:02:37 +01:00
parent 442de4c7c5
commit 09e8d19c7a
1 changed files with 10 additions and 1 deletions
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11
src/chart.tsx
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@ -201,13 +201,22 @@ export class Chart extends React.PureComponent<ChartProps, {}> {
const parent = d3.select('#svgContainer').node() as Element;
const scale = this.props.enableZoom ? d3.zoomTransform(parent).k : 1;
const zoomOutFactor = d3.min([
1,
scale,
parent.clientWidth / chartInfo.size[0],
parent.clientHeight / chartInfo.size[1],
])!;
const extent: [number, number] = this.props.enableZoom
? [d3.max([0.1, zoomOutFactor])!, 2]
: [1, 1];
d3.select(parent)
.on('scroll', () => scrolled(this.props.enableZoom))
.call(
d3
.zoom()
.scaleExtent(this.props.enableZoom ? [0.1, 2] : [1, 1])
.scaleExtent(extent)
.translateExtent([[0, 0], chartInfo.size])
.on('zoom', () => zoomed(chartInfo.size, this.props.enableZoom)),
);