src/charts/donut.js
function initHighlightSlice() {
            highlightedSlice = svg.selectAll('.chart-group .arc path')
                .select(filterHighlightedSlice).node();

            if (highlightedSlice) {
                drawLegend(highlightedSlice.__data__);
                tweenGrowth(highlightedSlice, externalRadius, pieDrawingTransitionDuration);
            }
        }
function initHighlightSlice() {
            highlightedSlice = svg.selectAll('.chart-group .arc path')
                .select(filterHighlightedSlice).node();

            if (highlightedSlice) {
                drawLegend(highlightedSlice.__data__);
                tweenGrowth(highlightedSlice, externalRadius, pieDrawingTransitionDuration);
            }
        }
function initHighlightSlice ( ) { highlightedSlice = svg . selectAll ( '.chart-group .arc path' ) . select ( filterHighlightedSlice ) . node ( ) ; if ( highlightedSlice ) { drawLegend ( highlightedSlice . __data__ ) ; tweenGrowth ( highlightedSlice , externalRadius , pieDrawingTransitionDuration ) ; } }
Find the slice by id and growth it if needed
@private
Find the slice by id and growth it if needed