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Editing Modes

EditModes provide a way of handling user interactions in order to manipulate GeoJSON features and geometries.

The following are the built-in EditModes provided by nebula.gl:

ViewMode

No edits are possible, but selection is still possible.

ModifyMode

User can move existing points, add intermediate points along lines, and remove points.

Edit Context

editContext argument to the onEdit callback contains the following properties:

  • positionIndexes (Array): An array of numbers representing the indexes of the edited position within the feature's coordinates array

  • position (Array): An array containing the ground coordinates (i.e. [lng, lat]) of the edited position

ExtrudeMode

User can move edge. Click and drag from anywhere between 2 points in edge.

ScaleMode

User can scale a feature about its centroid by clicking and dragging (inward or outward) the selected geometry. This mode supports multiple selections.

RotateMode

User can rotate a feature about its centroid by clicking and dragging the selected geometry. This mode supports multiple selections.

TranslateMode

The user can move a feature by selecting one or more features and dragging anywhere within the screen. Additionally, the user can initiate snapping by clicking and dragging the selected feature's vertex handles. If the vertex handle is close enough to another feature's vertex, the two features will snap together.

TransformMode

A single mode that provides translating, rotating, and scaling capabilities. Translation can be performed by clicking and dragging the selected feature itself. Rotating can be performed by clicking and dragging the top-most edit handle around a centroid pivot. Scaling can be performed by clicking and dragging one of the corner edit handles. Just like the individual modes, this mode supports multiple selections and feature snapping.

DuplicateMode

User can duplicate and translate a feature by clicking selected feature and dragging anywhere on the screen. This mode is extends TranslateMode. This mode supports multiple selections.

DrawPointMode

User can draw a new Point feature by clicking where the point is to be.

DrawLineStringMode

User can draw a new LineString feature by clicking positions to add. User finishes drawing by double-clicking.

ExtendLineStringMode

User can extend an existing LineString feature by clicking positions to add. A single LineString feature must be selected for this mode.

ModeConfig

The following options can be provided in the modeConfig object:

  • drawAtFront (optional): <boolean>
    • If true, will extend from the "beginning" of the line, i.e. relative to the start of the coordinates array.

Edit Context

editContext argument to the onEdit callback contains the following properties:

  • positionIndexes (Array): An array of numbers representing the indexes of the added position within the feature's coordinates array

  • position (Array): An array containing the ground coordinates (i.e. [lng, lat]) of the added position

ResizeCircleMode

User can resize an existing circular Polygon feature by clicking and dragging along the ring.

DrawPolygonMode

User can draw a new Polygon feature by clicking positions to add then closing the polygon (or double-clicking).

Edit Context

editContext argument to the onEdit callback contains the following properties:

  • positionIndexes (Array): An array of numbers representing the indexes of the added position within the feature's coordinates array

  • position (Array): An array containing the ground coordinates (i.e. [lng, lat]) of the added position

Draw90DegreePolygonMode

User can draw a new Polygon feature with 90 degree corners (right angle) by clicking positions to add then closing the polygon (or double-clicking). After clicking the 2 points, the draw mode guides/allows to have right angle polygon.

DrawPolygonByDraggingMode

User can draw a new Polygon feature by dragging (similar to the lasso tool commonly found in photo editing software).

ModeConfig

The following options can be provided in the modeConfig object:

  • throttleMs (optional): number
    • If provided, the dragging function will be throttled by the specified number of milliseconds.

DrawRectangleMode

User can draw a new rectangular Polygon feature by clicking two opposing corners of the rectangle.

ModeConfig

The following options can be provided in the modeConfig object:

  • dragToDraw (optional): boolean
    • If true, user can click and drag instead of clicking twice. Note however, that the user will not be able to pan the map while drawing.

DrawRectangleUsingThreePointsMode

User can draw a new rectangular Polygon feature by clicking three corners of the rectangle.

DrawSquareFromCenterMode

User can draw a new square-shaped Polygon feature by clicking the center and then along one of the corners of the square.

ModeConfig

The following options can be provided in the modeConfig object:

  • dragToDraw (optional): boolean
    • If true, user can click and drag instead of clicking twice. Note however, that the user will not be able to pan the map while drawing.

DrawCircleFromCenterMode

User can draw a new circular Polygon feature by clicking the center then along the ring.

ModeConfig

The following options can be provided in the modeConfig object:

  • steps (optional): x <number>
    • If steps: x means the circle will be drawn using x number of points.
  • dragToDraw (optional): boolean
    • If true, user can click and drag instead of clicking twice. Note however, that the user will not be able to pan the map while drawing.

DrawCircleByDiameterMode

User can draw a new circular Polygon feature by clicking the two ends of its diameter.

ModeConfig

The following options can be provided in the modeConfig object:

  • steps (optional): x <number>
    • If steps: x means the circle will be drawn using x number of points.
  • dragToDraw (optional): boolean
    • If true, user can click and drag instead of clicking twice. Note however, that the user will not be able to pan the map while drawing.

DrawEllipseByBoundingBoxMode

User can draw a new ellipse shape Polygon feature by clicking two corners of bounding box.

ModeConfig

The following options can be provided in the modeConfig object:

  • dragToDraw (optional): boolean
    • If true, user can click and drag instead of clicking twice. Note however, that the user will not be able to pan the map while drawing.

DrawEllipseUsingThreePointsMode

User can draw a new ellipse shape Polygon feature by clicking center and two corners of the ellipse.

SplitPolygonMode

User can split a polygon by drawing a new LineString feature on top of the polygon.

  • If the first and the last click is outside the polygon, it will split the polygon

  • If the clicked position is inside the polygon, it will not split the polygon

MeasureDistanceMode

User can measure a distance between two points.

ModeConfig

The following options can be provided in the modeConfig object:

  • turfOptions (Object, optional)

    • options object passed to turf's distance function
    • Default: undefined

  • formatTooltip (Function, optional)

    • Function to format tooltip text (argument is the numeric distance)
    • Default: (distance) => parseFloat(distance).toFixed(2) + units

  • measurementCallback (Function, optional)

    • Function to call as measurements are calculated
    • Default: undefined

MeasureAreaMode

User can measure an area by drawing an arbitrary polygon.

ModeConfig

The following options can be provided in the modeConfig object:

  • formatTooltip (Function, optional)

    • Function to format tooltip text (argument is the numeric area)
    • Default: (distance) => parseFloat(distance).toFixed(2) + units

  • measurementCallback (Function, optional)

    • Function to call as measurements are calculated
    • Default: undefined

MeasureAngleMode

User can measure an angle by drawing two lines.

ModeConfig

The following options can be provided in the modeConfig object:

  • formatTooltip (Function, optional)

    • Function to format tooltip text (argument is the numeric area)
    • Default: (distance) => parseFloat(angle).toFixed(2) + units

  • measurementCallback (Function, optional)

    • Function to call as measurements are calculated
    • Default: undefined

ElevationMode

User can move a point up and down.

ModeConfig

The following options can be provided in the modeConfig object:

  • minElevation (Number, optional)

    • The minimum elevation to allow
    • Default: 0

  • maxElevation (Number, optional)

    • The maximum elevation to allow
    • Default: 20000

  • calculateElevationChange (Function, optional)

    • A function to use to calculate the elevation change in response to mouse movement
    • Default: 10 * <vertical movement in pixels>
    • Configure to use movement based on viewport:
if (mode === 'elevation') {
  modeConfig.calculateElevationChange = (opts) =>
    ElevationMode.calculateElevationChangeWithViewport(viewport, opts);
}

Boolean Operations

For all polygon drawing modes, the following options can be provided in the modeConfig object:

  • booleanOperation (optional): null|'union'|'difference'|'intersection'
    • If non-null, requires a single Polygon or MultiPolygon selection
    • If null, the drawn Polygon is added as a new feature regardless of selection
    • If union, the drawn Polygon is unioned with the selected geometry
    • If difference, the drawn Polygon is subtracted from the selected geometry
    • If intersection, the drawn Polygon is intersected with the selected geometry

Composite Mode

Use CompositeMode to combine multiple modes. Not all combinations are guaranteed to work.

Constructor

new CompositeMode(modes, options = {})

  • modes: Array<EditMode> Modes you want to combine. Order is very important.
  • options (optional): Options to be added later.

Example

new CompositeMode([new DrawLineStringMode(), new ModifyMode()])