The step's label along the category axis.
Running total before this step.
Running total after this step.
The signed contribution, end - start.
Carried rather than derived because a producer may round the two totals for display, and a delta recomputed from rounded ends is not the number the chart's own label shows.
Whether the step adds, subtracts, or restates the total.
One step of a waterfall chart.
A waterfall answers "how did we get from here to there", so a step carries two numbers that a bar chart would conflate: the contribution it made (
delta) and the running total it produced (end). The bar is drawn floating betweenstartandend, which is why neither alone describes it — the height is the contribution and the position is the total.startandendare absolute positions on the value axis, so a producer that only knows offsets has to accumulate them before emitting, the same way ErrorBarPoint fixes absolute bounds.