C

GridConstraintProvider<T>

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A simple integer-based implementation of IGridConstraintProvider<T>.
Implements
Inheritance Hierarchy

Remarks

Type Parameters

T

The type of the items.

Examples

Enabling grid snapping

const snapContext = new GraphSnapContext()

const gridInfo = new GridInfo(50, 50)
snapContext.nodeGridConstraintProvider = new GridConstraintProvider(
  gridInfo,
)
snapContext.bendGridConstraintProvider = new GridConstraintProvider(
  gridInfo,
)
snapContext.portGridConstraintProvider = new GridConstraintProvider(
  gridInfo,
)
snapContext.gridSnapType = GridSnapTypes.GRID_POINTS

graphEditorInputMode.snapContext = snapContext

Note that the grid visualization has to be enabled separately

graphComponent.renderTree.createElement(
  graphComponent.renderTree.backgroundGroup,
  gridInfo,
  new GridRenderer(),
)

Members

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Constructors

GridConstraintProvider

(gridSize: number)
Creates a new instance using the given grid distances.

Parameters

gridSize: number
The distance in the newly created grid.

GridConstraintProvider

(gridInfo: GridInfo)
Creates a new instance using the given grid info.

Parameters

gridInfo: GridInfo
The grid info object.

GridConstraintProvider

(gridWidth: number, gridHeight: number)
Creates a new instance using the given grid specification.

Parameters

gridWidth: number
Width of the grid.
gridHeight: number
Height of the grid.

Properties

gridInfo

: GridInfo
Gets or sets the grid info that describes the geometry of the grid.
final

Property Value

The grid info.

gridOrigin

: Point
readonly
Gets the grid origin.
This implementation delegates to the gridInfo
readonlyfinal

horizontalGridWidth

: number
readonly
Gets the grid height.
This implementation delegates to the gridInfo
readonlyfinal

verticalGridWidth

: number
readonly
Gets the grid width.
This implementation delegates to the gridInfo
readonlyfinal

Methods

snapToGrid

(
context: IInputModeContext
item: T
location: IMutablePoint
xSnapPolicy: SnapPolicy
ySnapPolicy: SnapPolicy
): boolean
Performs the actual snapping to grid coordinates.

Parameters

context: IInputModeContext
The context in which the snapping should occur.
item: T
The item of which the coordinates should be snapped.
location: IMutablePoint
The coordinates to snap.
xSnapPolicy: SnapPolicy
The policy for the x-coordinate.
ySnapPolicy: SnapPolicy
The policy for the y-coordinate.

Return Value

boolean
Whether the point has been snapped.