Package org.openstreetmap.josm.actions.mapmode

Class ImproveWayAccuracyHelper

java.lang.Object

org.openstreetmap.josm.actions.mapmode.ImproveWayAccuracyHelper

final class ImproveWayAccuracyHelper
extends java.lang.Object

This static class contains functions used to find target way, node to move or segment to divide.

Constructor Summary

Constructors

Modifier	Constructor	Description
private	ImproveWayAccuracyHelper()

Method Summary

Modifier and Type	Method	Description
private static boolean	ensureCandidateIsNotBehindSegments(java.lang.Iterable<Pair<Node,Node>> wpps, Node n, EastNorth pEN, EastNorth nEN)	Check to see if a candidate node is underneath a way segment
static Node	findCandidateNode(MapView mv, Way w, java.awt.Point p)	Returns the nearest node to cursor.
static WaySegment	findCandidateSegment(MapView mv, Way w, java.awt.Point p)	Returns the nearest way segment to cursor.
static Way	findWay(MapView mv, java.awt.Point p)	Finds the way to work on.

Methods inherited from class java.lang.Object

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

Constructor Detail

ImproveWayAccuracyHelper

private ImproveWayAccuracyHelper()

Method Detail

findWay

public static Way findWay(MapView mv,
                          java.awt.Point p)

Finds the way to work on. If the mouse is on the node, extracts one of the ways containing it. If the mouse is on the way, simply returns it.

Parameters:

mv - the current map view

p - the cursor position

Returns:

Way or null in case there is nothing under the cursor.

findCandidateNode

public static Node findCandidateNode(MapView mv,
                                     Way w,
                                     java.awt.Point p)

Returns the nearest node to cursor. All nodes that are “behind” segments are neglected. This is to avoid way self-intersection after moving the candidateNode to a new place.

Parameters:

mv - the current map view

w - the way to check

p - the cursor position

Returns:

nearest node to cursor

ensureCandidateIsNotBehindSegments

private static boolean ensureCandidateIsNotBehindSegments(java.lang.Iterable<Pair<Node,Node>> wpps,
                                                          Node n,
                                                          EastNorth pEN,
                                                          EastNorth nEN)

Check to see if a candidate node is underneath a way segment

Parameters:

wpps - The pairs of nodes to check for crossing way segments

n - The current node to check

pEN - The cursor east-north position

nEN - The node east-north position

Returns:

true if the candidate node is underneath a way segment

findCandidateSegment

public static WaySegment findCandidateSegment(MapView mv,
                                              Way w,
                                              java.awt.Point p)

Returns the nearest way segment to cursor. The distance to segment ab is the length of altitude from p to ab (say, c) or the minimum distance from p to a or b if c is out of ab.

The priority is given to segments where c is in ab. Otherwise, a segment with the largest angle apb is chosen.

Parameters:

mv - the current map view

w - the way to check

p - the cursor position

Returns:

nearest way segment to cursor