Overview

The @vesium/plot package is Vesium's plotting layer.

It does not render raw Cesium primitives directly. Instead, it composes a plotting session, reusable plot definitions, interaction skeletons, and measurement helpers into a single workflow that can be restored, edited, and measured.

At a high level:

• usePlot owns the active plotting session and coordinates plot creation, restoration, cleanup, and updates.
• scheme defines what a plot looks like, how it completes, and which interaction skeletons it uses.
• skeleton defines how the user edits a plot after it appears on the scene.
• measure bundles ready-made measurement schemes and the low-level helpers that support them.

How the pieces fit together

Layer	What it really owns	Common collaborators
usePlot	The session state: current plots, timeline, active operate() call, restoration, cancellation, and lifecycle cleanup	PlotScheme, PlotSkeleton, PlotFeature, SampledPlotProperty, @vesium/core
scheme	The visual and logical definition of a plot: initial entity setup, per-frame render updates, completion rules, and attached skeletons	@vesium/geometry, @vesium/shared, skeleton
skeleton	The editing affordances: vertex dragging, midpoint insertion, whole-shape translation, and keyboard nudging	Cesium scene picking, coordinate conversion helpers
measure	Measurement-oriented schemes plus the distance/area/clamping helpers they rely on	scheme, skeleton, distance, area, lerpArray

Typical flow

import { PlotSchemePolygon, schemeMeasureDistance, usePlot } from 'vesium';

const { operate } = usePlot();

await operate(PlotSchemePolygon);
await operate(schemeMeasureDistance);

1. usePlot() creates or restores a plot session.
2. A PlotScheme describes the visual and logical behavior of the current plot, including when it is considered complete.
3. PlotSkeleton instances expose the handles the user can drag, insert, or move.
4. Measurement helpers compute distances, areas, and clamped positions when the plot needs numeric output.

Related packages

• @vesium/core provides the viewer lifecycle used by plot interactions.
• @vesium/shared provides coordinate conversion, throttling, and runtime helpers.
• @vesium/geometry provides polygon and tactical-arrow geometry generators used by some schemes.

Type Definitions

export * from './measure';
export * from './scheme';
export * from './skeleton';
export * from './usePlot';
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