Public evidence

apps.bar-graph

Machine-checked verification for runtime version 2.1.0.

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Verification

13/13 runtime tests

Golden tests 8 / 8
Boundary tests 5 / 5
Published UI cases 2 documented
Runtime tested Yes
Source checked Yes

Fingerprint sha256:e5984c3a1a3aafcc7bdbb4c52bc9af015f8a68bce71e656ff81d401279e4b533

Build & scope

Engine identity and declared limitations.

Tool: bar-graph
Engine: bar-graph-runtime
Engine build: —
Evidence core: 2026-08-19T22:32:15.117Z
Rendered: 2026-08-19T22:32:15.117Z
Last reviewed: 2026-08-20

Assumptions

Scale domain is [min(0, min(values)), max(0, max(values))].
Positive bars grow away from the zero baseline toward domainMax; negative bars toward domainMin.
If every value is 0, domain is [0, 1] and all bars have length 0.

Limitations

One series per chart. Malformed lines are skipped.
Axis labels longer than about 8–10 characters are truncated on the canvas.
PNG export is a local canvas snapshot, not a server-rendered image.

Sources

Standards and references supporting this runtime specification. Methods are listed separately — they are algorithms, not bibliographic sources.

Vega-Lite — Bar Chart with Negative Values and a Zero-Baseline
Supports: Negative bars cross a zero baseline in the opposite direction
Vega-Lite — Scale
Supports: Quantitative bar scale includes zero unless explicitly disabled

Verification disclosure

Aggregate outcomes, scope and artifact commitments are public. Complete test inputs, expected values, execution records and oracle infrastructure are retained privately. This summary does not independently reproduce the full verification run.