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Bug 482121

Summary:	NPE in Straight#getProjection()
Product:	[Tools] GEF	Reporter:	Alexander Nyßen <nyssen>
Component:	GEF Geometry	Assignee:	Alexander Nyßen <nyssen>
Status:	RESOLVED FIXED	QA Contact:
Severity:	normal
Priority:	P3
Version:	0.2.0
Target Milestone:	4.0.0 / 3.11.0 (Neon) M4
Hardware:	All
OS:	All
Whiteboard:

Description Alexander Nyßen

2015-11-13 10:04:47 EST

While zooming within Zest.FX, an NPE within Straight#getDistance(Straight.java:292) can be observed. It happens because Straight#getIntersection() return null in this case (which should not be the case). The related input data is as follows:

POSITION: Vector: [57.36146803551614,1.8866002881313908E16]
DIRECTION: Vector: [0.0,16.0]
VECTOR: Vector: [51.15375383435782,1.8866002881313916E16]

Comment 1 Alexander Nyßen

2015-11-15 07:27:48 EST

When the position vector of the straight and/or the given vector have very large values when computing Straight#getProjection, the underlying intersection computation performed via Straight#getIntersection() will fail. 

This is because the projective geometry calculation adds position to direction values (this.position.getAdded(this.direction) and other.position.getAdded(other.direction)) is below the precision boundary (i.e. the summation vector will be equal to position or other.position respectively). 

Added a compensation within Straight#getProjection() so that the straight and given vector are virtually shiftet (so that the straight goes through the origin) before the intersection compensation (and the result is shifted back).

Pushed changes to origin/master. Resolving as fixed in 3.11.0 M4.