y.layout
Interface IntersectionCalculator

public interface IntersectionCalculator

Interface implemented by classes that are responsible for calculating the intersection point between an Edge and the visual representation of its source or target node. This interface is especially useful in conjunction with the PortCalculator LayoutStage.

See Also:

PortCalculator

Field Summary

static Object	SOURCE_INTERSECTION_CALCULATOR_DPKEY Key to be used when registering a DataProvider to a graph instance that provides for each Edge object in a graph an IntersectionCalculator instance that is configured to calculate the intersection of the edge and the source node.
static Object	TARGET_INTERSECTION_CALCULATOR_DPKEY Key to be used when registering a DataProvider to a graph instance that provides for each Edge object in a graph an IntersectionCalculator instance that is configured to calculate the intersection of the edge and the target node.

Method Summary

YPoint

calculateIntersectionPoint(NodeLayout nl, double xOffset, double yOffset, double dx, double dy) Calculates an intersection point given the coordinates of a point lying on the last/first segment of an Edge and a normalized direction.

Field Detail

SOURCE_INTERSECTION_CALCULATOR_DPKEY

static final Object SOURCE_INTERSECTION_CALCULATOR_DPKEY

Key to be used when registering a DataProvider to a graph instance that provides for each Edge object in a graph an IntersectionCalculator instance that is configured to calculate the intersection of the edge and the source node.

TARGET_INTERSECTION_CALCULATOR_DPKEY

static final Object TARGET_INTERSECTION_CALCULATOR_DPKEY

Key to be used when registering a DataProvider to a graph instance that provides for each Edge object in a graph an IntersectionCalculator instance that is configured to calculate the intersection of the edge and the target node.

Method Detail

calculateIntersectionPoint

YPoint calculateIntersectionPoint(NodeLayout nl,
                                  double xOffset,
                                  double yOffset,
                                  double dx,
                                  double dy)

Calculates an intersection point given the coordinates of a point lying on the last/first segment of an Edge and a normalized direction. If no such intersection can be found this method should return null.

Parameters:

nl - the currently calculated NodeLayout

xOffset - the relative (to the node's center) x-coordinate of a point on the last line segment

yOffset - the relative y-coordinate of a point on the last line segment

dx - the x component of the normalized direction vector indicating the direction of the segment pointing towards the node

dy - the y component of the normalized direction vector indicating the direction of the segment pointing towards the node

Returns:

the new relative (to the node's center) intersection coordinates or null if no such intersection could be found