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MGHGRDENSITYRECT2__DEFINE

MGHGRDENSITYRECT2__DEFINE

Class Name


  MGHgrDensityRect2

Purpose


  This class implements a "density plot", ie a representation of 2-D
  numeric data on a flat surface using colour or grey-scale
  density. A rectangular array of cells (quadrilaterals) is set out
  and the data values are represented by the colour at the centre of
  the cells (STYLE=0) or at the vertices (STYLE=1).
  The MGHgrDensityRect2 (MDR2) implementation regrids the data to an
  IDLgrImage of fixed dimensions. It is thus similar to an
  MGHgrDensityRect (MDR), but differs in that an MDR2 is a
  stand-alone image whereas an MDR is a polygon with the image
  mounted as a texture map. The MDR2 is redrawn slightly faster but
  doesn't behave very well in a 3D environment. Also the MDR2
  doesn't currently support curvilinear grids, though this could be
  grafted in as it has been with the MDR. In any case, if I ever
  find a compelling use for the MDR2 I should overhaul the code
  along the lines of the MDR.
###########################################################################
  This software is provided subject to the following conditions:
  1. NIWA makes no representations or warranties regarding the
    accuracy of the software, the use to which the software may
    be put or the results to be obtained from the use of the
    software. Accordingly NIWA accepts no liability for any loss
    or damage (whether direct of indirect) incurred by any person
    through the use of or reliance on the software.
  2. NIWA is to be acknowledged as the original author of the
    software where the software is used or presented in any form.
###########################################################################

Modification History


  Mark Hadfield, 1998-09:
    Written, based on earlier density plot implementations.
  Mark Hadfield, 2002-07:
    Now allows a curvilinear horizontal grid via 2-dimensional
    DATAX and DATAY arrays.



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