[SIS-176] Provide an optimized MathTransform implementation for diagonal matrices

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.6
• Fix Version/s: 0.7
• Component/s: Referencing
• Assignee: Martin Desruisseaux
• Reporter: Martin Desruisseaux
• Created: 09/Jul/14 15:11
• Updated: 14/Dec/18 12:07
• Resolved: 12/Nov/15 14:06

Description

ProjectiveTransform handles arbitrary matrices in a generic way. However in practice, many matrices are diagonal + a translation transform. We may get some performance improvement if we write a specialized transform class for such matrices, because it would replace a O(n²) operation by a O(n) one (n is the matrix size).