feat(measure): add a body radius option so measurements work off Earth - #130
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MeasureControl derives distances and areas from lon/lat angles multiplied by a hardcoded 6371000 m, so on a Moon, Mars, or other planetary basemap every readout is wrong by that body's radius ratio (~1.88x on Mars). Add a `radius` option, plus `getRadius()`/`setRadius()`, that decides which body the readouts describe. `setRadius()` recomputes the measurements already on the map from their points, so switching bodies mid-session updates every result instead of leaving a mix of two bodies, and emits a new `radiuschange` event so a host that caches values derived from a measurement can refresh them. The default is unchanged, so Earth behaviour is byte-for-byte identical. Reported downstream in opengeos/GeoLibre#1128.
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📝 WalkthroughWalkthrough
ChangesConfigurable measurement radius
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟡 Moderate · up to The new radius option can be initialized with zero, negative, or non-finite values, producing invalid measurement readouts even though later updates reject them. Merge should wait for consistent validation of the initial value. Sequence Diagram(s)sequenceDiagram
participant Caller
participant MeasureControl
participant MeasurementStore
participant MeasurementDisplay
Caller->>MeasureControl: setRadius(radius)
MeasureControl->>MeasurementStore: recompute measurements
MeasurementStore-->>MeasureControl: updated distances and areas
MeasureControl->>MeasurementDisplay: refresh readouts and list
MeasureControl-->>Caller: emit radiuschange
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Actionable comments posted: 1
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Inline comments:
In `@src/lib/core/MeasureControl.ts`:
- Around line 1335-1339: Apply the same validation rule used by setRadius to the
constructor’s initial options.radius before storing it: reject non-finite and
non-positive values, including zero, negative, NaN, and infinities, and
normalize them to the existing valid default behavior. Keep positive finite
radii unchanged and ensure subsequent measurement recomputation never receives
an invalid initial radius.
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README.mdsrc/index.tssrc/lib/core/MeasureControl.tssrc/lib/core/types.tstests/MeasureControl.test.ts
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- Validate the constructor's `radius` option with the same rule `setRadius`
uses. `new MeasureControl({ radius: 0 })` previously produced zero-length
measurements, a negative radius flipped their sign, and NaN/Infinity made
every readout NaN, because only later changes were checked. Both paths now
share an `isUsableRadius` helper and fall back to Earth's radius.
- Cover the new normalization: an unusable `radius` option falls back to
Earth, a valid one is kept, and `setRadius` also rejects Infinity.
MeasureControl derives distances and areas from lon/lat angles multiplied
by a hardcoded 6371000 m, so on a Moon, Mars, or other planetary basemap
every readout is wrong by that body's radius ratio (~1.88x on Mars).
Add a
radiusoption, plusgetRadius()/setRadius(), that decideswhich body the readouts describe.
setRadius()recomputes themeasurements already on the map from their points, so switching bodies
mid-session updates every result instead of leaving a mix of two bodies,
and emits a new
radiuschangeevent so a host that caches values derivedfrom a measurement can refresh them.
The default is unchanged, so Earth behaviour is byte-for-byte identical.
Reported downstream in opengeos/GeoLibre#1128.
Summary by CodeRabbit
New Features
radiuschangeevent for tracking measurement-radius updates.Documentation