Unit conversion issue... Feet vs Inches... Gets me every time!
-g
On Wed, Oct 8, 2014 at 12:42 AM, Frank van der Hulst <
drifter.fr...@gmail.com> wrote:
> Hi Greg,
> Not a lot of information to go on, so some generalities...
>
> If you're scaling the object (e.g. an icon or image) relative to map, you
> need to translate the origin of the object to the origin of the map, then
> rotate and scale, then translate to the correct location. Otherwise your
> translation gets scaled and rotated.
>
> And just to cover the obvious, I assume that your geoRotate is in degrees.
> And in mathematical degrees (0 = X axis, CCW is +ve) as opposed to
> geographical degrees (0 is the Y axis, clockwise is positive).
>
> Frank
>
>
> On Wed, Oct 8, 2014 at 4:08 PM, Greg Knight <greg.knight...@gmail.com>
> wrote:
>
>> Greetings,
>>
>> I'm using v10.6 of GeoTools. I am trying to do something that I think
>> should be relatively simple -- but perhaps I dont understand matrices well
>> enough. I am trying to translate, scale, and rotate a point. Translation
>> seems easy enough -- like I should be able to add the x and y offsets, then
>> scale and rotate around that same offset.
>>
>> So Ive tried a number of things similar to this:
>>
>> final AffineTransform translateTransform =
>>
>> AffineTransform.getTranslateInstance(geoX, geoY);
>>
>> final AffineTransform rotateTransform =
>>
>>
>> AffineTransform.getRotateInstance(Math.toRadians(geoRotate), 0.0, 0.0);
>>
>> final AffineTransform scaleTransform =
>>
>> AffineTransform.getScaleInstance(geoScale, geoScale);
>>
>> Then something like this:
>>
>> final Point2D sourcePoint = outerRing.get(j);
>>
>>
>>
>> // translate, rotate, scale
>>
>> final AffineTransform transform = new
>> AffineTransform(translateTransform);
>>
>> transform.concatenate(rotateTransform);
>>
>> transform.concatenate(scaleTransform);
>>
>>
>>
>> final Point2D targetPoint = new Point2D();
>>
>> transform.transform(sourcePoint, targetPoint);
>>
>> For a source point of [ -95.75, 224.45 ]
>>
>>
>> The correct transformation should result in [ 716731.24, 3016405.92 ]
>>
>> Im getting [ 716942.89, 3016333.19 ] which is in the neighborhood, but
>> not really close enough.
>>
>> Where am I going wrong here?
>>
>> Thanks in advance!
>>
>> Greg
>>
>>
>>
>>
>>
>>
>> ------------------------------------------------------------------------------
>> Meet PCI DSS 3.0 Compliance Requirements with EventLog Analyzer
>> Achieve PCI DSS 3.0 Compliant Status with Out-of-the-box PCI DSS Reports
>> Are you Audit-Ready for PCI DSS 3.0 Compliance? Download White paper
>> Comply to PCI DSS 3.0 Requirement 10 and 11.5 with EventLog Analyzer
>>
>> http://pubads.g.doubleclick.net/gampad/clk?id=154622311&iu=/4140/ostg.clktrk
>> _______________________________________________
>> GeoTools-GT2-Users mailing list
>> GeoTools-GT2-Users@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users
>>
>>
>
>
> ------------------------------------------------------------------------------
> Meet PCI DSS 3.0 Compliance Requirements with EventLog Analyzer
> Achieve PCI DSS 3.0 Compliant Status with Out-of-the-box PCI DSS Reports
> Are you Audit-Ready for PCI DSS 3.0 Compliance? Download White paper
> Comply to PCI DSS 3.0 Requirement 10 and 11.5 with EventLog Analyzer
>
> http://pubads.g.doubleclick.net/gampad/clk?id=154622311&iu=/4140/ostg.clktrk
> _______________________________________________
> GeoTools-GT2-Users mailing list
> GeoTools-GT2-Users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users
>
>
------------------------------------------------------------------------------
Meet PCI DSS 3.0 Compliance Requirements with EventLog Analyzer
Achieve PCI DSS 3.0 Compliant Status with Out-of-the-box PCI DSS Reports
Are you Audit-Ready for PCI DSS 3.0 Compliance? Download White paper
Comply to PCI DSS 3.0 Requirement 10 and 11.5 with EventLog Analyzer
http://pubads.g.doubleclick.net/gampad/clk?id=154622311&iu=/4140/ostg.clktrk
_______________________________________________
GeoTools-GT2-Users mailing list
GeoTools-GT2-Users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users
