lsst::afw::geom::SipApproximation::Grid Struct Reference

Public Member Functions
	Grid (lsst::geom::Extent2I const &shape_, SipApproximation const &parent)

Public Attributes
lsst::geom::Extent2I const	shape
std::vector< lsst::geom::Point2D >	dpix1
std::vector< lsst::geom::Point2D >	siwc
std::vector< lsst::geom::Point2D >	dpix2

Detailed Description

Definition at line 109 of file SipApproximation.cc.

Constructor & Destructor Documentation

Grid()

lsst::afw::geom::SipApproximation::Grid::Grid	(	lsst::geom::Extent2I const &	shape_,
		SipApproximation const &	parent
	)

Definition at line 160 of file SipApproximation.cc.

                                                                                           :
    shape(shape_),
    dpix1(makeGrid(parent._bbox, shape)),
    siwc(parent._pixelToIwc->applyForward(dpix1))
{
    // Apply the CRPIX offset to make pix1 into dpix1 (in-place)
    std::for_each(dpix1.begin(), dpix1.end(), [&parent](lsst::geom::Point2D & p){ p -= parent._crpix; });
 
    if (parent._useInverse) {
        // Set from the given inverse of the given pixels-to-iwc transform
        // Note that at this point, siwc is still just iwc, because the scaling by cdInv is later.
        dpix2 = parent._pixelToIwc->applyInverse(siwc);
        // Apply the CRPIX offset to make pix1 into dpix2 (in-place)
        std::for_each(dpix2.begin(), dpix2.end(), [&parent](lsst::geom::Point2D & p){ p -= parent._crpix; });
    } else {
        // Just make dpix2 = dpix1, and hence fit to the true inverse of pixels-to-iwc.
        dpix2 = dpix1;
    }
 
    // Apply the CD^{-1} transform to siwc
    std::for_each(siwc.begin(), siwc.end(), [&parent](lsst::geom::Point2D & p){ p = parent._cdInv(p); });
}

Member Data Documentation

dpix1

std::vector<lsst::geom::Point2D> lsst::afw::geom::SipApproximation::Grid::dpix1

Definition at line 115 of file SipApproximation.cc.

dpix2

std::vector<lsst::geom::Point2D> lsst::afw::geom::SipApproximation::Grid::dpix2

Definition at line 117 of file SipApproximation.cc.

shape

lsst::geom::Extent2I const lsst::afw::geom::SipApproximation::Grid::shape

Definition at line 114 of file SipApproximation.cc.

siwc

std::vector<lsst::geom::Point2D> lsst::afw::geom::SipApproximation::Grid::siwc

Definition at line 116 of file SipApproximation.cc.

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The documentation for this struct was generated from the following file:

• /j/snowflake/release/lsstsw/stack/0.4.3/Linux64/afw/21.0.0-25-g1d57be3cd+e73869a214/src/geom/SipApproximation.cc