Re: [Geotools-devel] Replacing Vecmath

[Jody G. <jod...@gm...>]

Let me try:

*gt-metadata: *looks to just be data structure (Point3d and
MismatchedSizeException)

org.geotools.math.Line
org.geotools.math.Plane

*gt-referencing: *uses assorted exceptions, extends GMatrix, and
Matrix3d/Matrix4d multiply

org.geotools.referencing.operation.DefaultCoordinateOperationFactory

org.geotools.referencing.operation.builder.AdvancedAffineBuilder
org.geotools.referencing.operation.builder.AffineTransformBuilder
org.geotools.referencing.operation.builder.BursaWolfTransformBuilder
- Imports GMatrix but does not use it
org.geotools.referencing.operation.builder.MathTransformBuilder
org.geotools.referencing.operation.builder.ProjectiveTransformBuilder
org.geotools.referencing.operation.builder.RubberSheetBuilder
org.geotools.referencing.operation.builder.SimilarTransformBuilder

org.geotools.referencing.operation.matrix.GeneralMatrix
- extends GMatrix (this is the key integration point with vecmath)
org.geotools.referencing.operation.matrix.Matrix1.java
org.geotools.referencing.operation.matrix.Matrix2.java
org.geotools.referencing.operation.matrix.Matrix3.java
- uses Matrix3d.multiply
org.geotools.referencing.operation.matrix.Matrix4.java
- uses Matrix4d.multiply
org.geotools.referencing.operation.matrix.XMatrix.java

org.geotools.referencing.operation.transform.AbstractMathTransform
org.geotools.referencing.operation.transform.ProjectiveTransform

So it comes down to:

* Extending GMatrix
* delegating to Matricx3d multiply and Matrix4d.muiltiply

So we are stuck going through the GMatrix methods and seeing which ones are
called. Going to ignore things like constructors/equals/set/get (so we can
focus on where the math is used)
- GMatrix.add(GMatrix,GMatrix) - used by cglib-nodep-2.1_3.jar (not sure
what this is)
- GMatrix.invert() - called by AdvancedAffineBuilder,
BursaWolfTransformBuilderm ProjectiveTransformBuilder
- GMatrix.mul(GMatrix) called by BursaWolfTransformBuilder, GeneralMatrix
- GMatrix.mul(GMatrix,GMatrix) called by AdvancedAffineBuilder,
BursaWolfTransformBuilder, ProjectiveTransformBuilder, ConcatenatedTransform
- GMatrix.negate() called by AdvancedAffineBuilder,
BursaWolfTransformBuilder
- GMatrix.sub(GMatrix) called by MathTransformBuilderTest
- GMatrix.sub(GMatrix,GMatrix) called by AdvancedAffineBuilder,
BursaWolfTransformBuilder
- GMatrix.transform() called by AdvancedAffineBuilder,
BursaWolfTransformBuilder, ProjectiveTransformBuilder


Not quite sure what to make of that .. looks like multiply, invert, negate,
transform are our actual requirements.


--
Jody Garnett

On 4 February 2015 at 18:58, Eric Engle <ee...@go...> wrote:

> I've used almost all of those options at one time or another, but is there
> a synopsis of the vecmath features that are actually used within Geotools?
>
> On Wed, Feb 4, 2015 at 1:20 PM, Tyler Battle <tb...@bo...>
> wrote:
>
>> Thanks to Jody, for pointing me at
>> http://docs.codehaus.org/display/GEOTOOLS/Replace+Vecmath
>>
>> Has anyone worked with any of these (or similar) libraries?
>>
>> When I have some free time, I'm going to try some of the drop-in (fingers
>> crossed) replacements. If there isn't a loss in performance, this would be
>> an easy short/medium term solution. Does anyone have any suggestions for
>> testing the performance of these libs?
>>
>> Switching to a more specialized library or rolling our own is also an
>> option. My expertise is very limited in this respect, so I'd need a lot of
>> help if we want to consider this option.
>>
>> --
>>
>> Tyler Battle
>>
>> Software Engineer| Boundless
>>
>> tb...@bo... <ca...@bo...>
>>
>> Victoria, BC, Canada
>>
>>
>> <https://twitter.com/boundlessgeo>
>>
>>
>>
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>
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