Matrices, tables and analysis panels
Risk/priority matrix with threshold bands
A heatmap whose colours come from declared thresholds: green/amber/red by band, not by raw magnitude.
matrix.heatmap@1New DDN source
Why use it?
Reviewers ask "is it bad?" before "how big?" — bands answer the first question without hiding the second.
When it helps
Risk registers, SLO dashboards, priority triage.
How to read it
- Band boundaries are data, declared in the view — read them before the colours.
- A cell near a boundary is a judgement call, not a colour.
What you need
- The measure
- The thresholds
- The items on the axes
Things to check
- Do not tune a threshold to make a cell change colour without saying so.
- Do not use red/green without a non-colour cue.
Scope of this diagram
Declared bands from declared data; the thresholds are policy, not statistics.
Work with the converted example
- Open the viewer and select
heat_bands. Inspect the rendered view and its source. - Open the designer. Keep the selected profile and inspect its legal palette and property controls.
- Change one displayed title or an appropriate data value. Apply the edit and check the resulting diagram.
- Run the verifier and review its diagnostics before moving complete content into review.
- Download your edited DDN source to retain the change.
The example uses the indentation-based ddn-next-1 dialect. The language guide explains reusable definitions, dotted data rows and explicit property blocks.