
trXAxisType

This resource of type NhlTAxisType
sets the type of transformation used for the X Axis. It has three
possible settings:
IrregularAxis
 Based on the values of the trXCoordPoints resource (and
possibly the trXInterPoints resource), an irregular
coordinate system is defined along the X Axis. If
trXCoordPoints is unset or found to be invalid, a warning
will be issued and trXAxisType will be reset to its default
value:
LinearAxis
.
LogAxis
 A logarithmic coordinate system is established for the X Axis with
boundaries defined by the values of trXMinF and
trXMaxF. If trXMinF is less than or equal to 0.0, a
warning will be issued and trXAxisType will be reset to its
default value:
LinearAxis
.
LinearAxis
 A linear coordinate system is established for the X Axis with
boundaries defined by the values of trXMinF and
trXMaxF.
This resource may be intercepted or disabled by:
Default: LinearAxis

trXCoordPoints

If trXInterPoints is not set, this array resource represents
uniformly spaced samples of a bounded irregularly spaced data
coordinate system along the X Axis. The elements of
the array must be arranged in a monotonically increasing or decreasing
order. The coordinate system bounds are defined as the values of the
minimum and maximum elements of the array: in other words, its first
and last elements. If you superimpose on this coordinate system a
regular coordinate system such that the left end is 0 and the right end
is the number of elements in the array minus 1, then each succeeding
array element value represents the coordinate value of the irregular
coordinate system at successive integral coordinate points (0, 1, 2,
...) of the overlaid regular coordinate system. Note that these
integral coordinates correspond directly to the array element index
(with an offset of 1 when using a Fortran interface). Based on this
mapping, the IrregularTransformation sets up both a forward
and a reverse transformation.
trXCoordPoints is ignored unless trXAxisType is
set to IrregularAxis
. If the array contains less than two
points or is nonmonotonic, a warning will be issued and trXAxisType
will be reset to its default value: LinearAxis
.
V4.1 Status Note 2
This resource may be intercepted or disabled by:
Default: NULL

trXInterPoints

This array resource, which, if set, must contain the same number of
points as trXCoordPoints, adds another step to the mapping
from regular to irregular coordinates. As in the case when
trXInterPoints is not set, you superimpose a bounded regular
coordinate system on the irregular coordinate system. Successive
elements of trXInterPoints, like those of
trXCoordPoints, must increase or decrease
monotonically. However, the element values have a range defined by the
bounds of the superimposed regular coordinate system (0 through array
size  1). Now the location of the data coordinate point specified by
each successive element of the trXCoordPoints is determined,
not by direct correlation with its array index, but by the value of
the corresponding element of the trXInterPoints array.
trXInterPoints is ignored unless trXAxisType is
set to IrregularAxis
. If trXInterPoints is found to
be invalid, IrregularTransformation issues a warning
message and computes the coordinate transformation as if it had not
been set.
This resource may be intercepted or disabled by:
Default: NULL

trXTensionF

Specifies the value of the tension parameter applied to the spline
approximation used to set up the irregular transformation for the X
Axis coordinate system. Small values (less than ~1.0) imply a relaxed
approximation; large values (greater than ~5.0) imply a tight
approximation. Note that large values of this parameter (>~10.0) may
cause the transformation to become unstable or even fail.
Default: 2.0

trXSamples

Specifies the number of sample points over the XAxis
coordinate system that IrregularTransformation is to use in
order to determine the reverse transformation. More sample points
(usually) increase the accuracy of the reverse transformation, but at
the cost of greater processing time for every transformation
calculated.
This resource may be intercepted or disabled by:
Default: 9

trYAxisType

This resource of type NhlTAxisType
sets the type of transformation used for the Y Axis. It has three
possible settings:
IrregularAxis
 Based on the values of the trYCoordPoints resource (and
possibly the trYInterPoints resource), an irregular
coordinate system is defined along the Y Axis. If
trYCoordPoints is unset or found to be invalid, a warning
will be issued and trYAxisType will be reset to its default
value:
LinearAxis
.
LogAxis
 A logarithmic coordinate system is established for the Y Axis with
boundaries defined by the values of trYMinF and
trYMaxF. If trYMinF is less than or equal to 0.0, a
warning will be issued and trYAxisType will be reset to its
default value:
LinearAxis
.
LinearAxis
 A linear coordinate system is established for the Y Axis with
boundaries defined by the values of trYMinF and
trYMaxF.
This resource may be intercepted or disabled by:
Default: LinearAxis

trYCoordPoints

If trYInterPoints is not set, this array resource represents
uniformly spaced samples of a bounded, irregularly spaced data
coordinate system along the Y Axis. The elements of the array must be
arranged in a monotonically increasing or decreasing order. The
coordinate system bounds are defined as the values of the minimum and
maximum elements of the array: in other words, its first and last
elements. If you superimpose on this coordinate system a regular
coordinate system such that the bottom end is 0 and the top end is the
number of elements in the array minus 1, then each succeeding array
element value represents the coordinate value of the irregular
coordinate system at successive integral coordinate points (0, 1, 2,
...) of the overlaid regular coordinate system. Note that these
integral coordinates correspond directly to the array element index
(with an offset of 1 when using a Fortran interface). Based on this
mapping, the IrregularTransformation sets up both a forward
and a reverse transformation.
trYCoordPoints is ignored unless trYAxisType is
set to IrregularAxis
. If the array contains less than two
points or is nonmonotonic, a warning will be issued and trYAxisType
will be reset to its default value: LinearAxis
.
This resource may be intercepted or disabled by:
V4.1 Status Note 2
Default: NULL

trYInterPoints

This array resource, which, if set, must contain the same number of
points as trYCoordPoints, adds another step to the mapping
from regular to irregular coordinates. As in the case when
trYInterPoints is not set, you superimpose a bounded regular
coordinate system on the irregular coordinate system. Successive
elements of trYInterPoints, like those of
trYCoordPoints, must increase or decrease
monotonically. However, the element values have a range defined by the
bounds of the superimposed regular coordinate system (0 through array
size 1). Now the location of the data coordinate point specified by
each successive element of the trYCoordPoints is determined,
not by direct correlation with its array index, but by the value of
the corresponding element of the trYInterPoints array.
trYInterPoints is ignored unless trYAxisType is
set to IrregularAxis
. If trYInterPoints is found to
be invalid, IrregularTransformation issues a warning
message and computes the coordinate transformation as if it had not
been set.
This resource may be intercepted or disabled by:
Default: NULL

trYTensionF

Specifies the value of the tension parameter applied to the spline
approximation used to set up the irregular transformation for the Y
Axis coordinate system. Small values (less than ~1.0) imply a relaxed
approximation; large values (greater than ~5.0) imply a tight
approximation. Note that large values of this parameter (>~10.0) may
cause the transformation to become unstable or even fail.
Default: 2.0

trYSamples

Specifies the number of sample points over the YAxis
coordinate system that IrregularTransformation is to use in
order to determine the reverse transformation. More sample points
(usually) increase the accuracy of the reverse transformation, but at
the cost of greater processing time for every transformation
calculated.
This resource may be intercepted or disabled by:
Default: 9