Package org.eclipse.gef.fx.anchors

Class ProjectionStrategy

java.lang.Object

org.eclipse.gef.fx.anchors.ProjectionStrategy

All Implemented Interfaces:

IComputationStrategy

Direct Known Subclasses:

ChopBoxStrategy, OrthogonalProjectionStrategy

public class ProjectionStrategy
extends Object
implements IComputationStrategy

An IComputationStrategy that computes anchor position by projecting the respective anchored reference point to the outline of the anchorage reference geometry so that the respective point has minimal distance to the anchored reference point. In detail, the computation is done as follows:

1. Compute the anchorage outlines (in scene) based on the anchorage reference geometry,using getOutlineSegments(IGeometry).
2. Transform the given anchored reference point to scene coordinates.
3. Project the anchored reference point (in scene) onto the anchorage outlines.
4. Return the nearest projection to the anchored reference point.

Nested Class Summary

Nested classes/interfaces inherited from interface org.eclipse.gef.fx.anchors.IComputationStrategy

IComputationStrategy.Parameter<T>

Constructor Summary

Constructors

Constructor	Description
ProjectionStrategy()

Method Summary

Modifier and Type	Method	Description
Point	computePositionInScene(javafx.scene.Node anchorage, javafx.scene.Node anchored, Set<IComputationStrategy.Parameter<?>> parameters)	Computes an anchor position based on the given anchorage visual, anchored visual, and anchored reference point.
protected Point	computeProjectionInScene(List<ICurve> anchorageOutlinesInScene, Point anchoredReferencePointInScene, Set<IComputationStrategy.Parameter<?>> parameters)	Computes the anchorage reference position in scene coordinates, based on the given anchorage outlines and the given anchored reference point.
protected List<ICurve>	getOutlineSegments(IGeometry geometry)	Determines the outline of the given IGeometry, represented as a list of ICurves.
Set<Class<? extends IComputationStrategy.Parameter<?>>>	getRequiredParameters()	Returns the types of parameters required by this strategy.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

ProjectionStrategy

public ProjectionStrategy()

Method Details

computePositionInScene

public Point computePositionInScene(javafx.scene.Node anchorage,
 javafx.scene.Node anchored,
 Set<IComputationStrategy.Parameter<?>> parameters)

Description copied from interface: IComputationStrategy

Computes an anchor position based on the given anchorage visual, anchored visual, and anchored reference point.

Specified by:

computePositionInScene in interface IComputationStrategy

Parameters:

anchorage - The anchorage visual.

anchored - The anchored visual.

parameters - The available computation parameters. strategy.

Returns:

The anchor position.

computeProjectionInScene

protected Point computeProjectionInScene(List<ICurve> anchorageOutlinesInScene,
 Point anchoredReferencePointInScene,
 Set<IComputationStrategy.Parameter<?>> parameters)

Computes the anchorage reference position in scene coordinates, based on the given anchorage outlines and the given anchored reference point.

Parameters:

anchorageOutlinesInScene - A list of ICurves that describe the outline of the anchorage.

anchoredReferencePointInScene - The reference Point of the anchored for which the anchorage reference Point is to be determined.

parameters - The parameters available for the computation.

Returns:

The anchorage reference position.

getOutlineSegments

protected List<ICurve> getOutlineSegments(IGeometry geometry)

Determines the outline of the given IGeometry, represented as a list of ICurves.

Parameters:

geometry - The anchorage geometry.

Returns:

A list of ICurves representing the outline of the given IGeometry.

getRequiredParameters

public Set<Class<? extends IComputationStrategy.Parameter<?>>> getRequiredParameters()

Description copied from interface: IComputationStrategy

Returns the types of parameters required by this strategy.

Specified by:

getRequiredParameters in interface IComputationStrategy

Returns:

The parameters required by this strategy.