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Fortran 95 bindings for PLplot
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------------------------------
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The Fortran 95 bindings for PLplot have been set up with the following
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considerations in mind:
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- reuse the bindings for FORTRAN 77 if possible
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- provide alternative calls for the various routines to take advantage
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of the features of Fortran 95, most notably, to simplify the interface
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- provide a module that takes care of all the details
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Fortran 90 versus Fortran 95
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----------------------------
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Because the Fortran 95 standard is supported by most if not all current
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Fortran compilers, it seemed logical to target this standard, rather
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than Fortran 90. The differences are small enough though not to matter
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To stress that Fortran 95 is the target, we use .f95 as the extension
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for the examples. Note that the extension is not important for
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most compilers: it merely indicates that the freeform source format is
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The PLplot module defines:
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- Several parameters for use with the PLplot library
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- Interfaces for all the routines that can be used with Fortran 95
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- Several alternative interfaces for various routines
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- PLFLT or PLF for short
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This is the KIND parameter for all floating-point variables and values
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used by the PLplot library. See the example below for its use
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A parameter used in the call to PLPARSEOPTS
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The approximation of the number "pi". It is used in many examples
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and because it is often defined in other modules as well, we have
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given it a more specific name.
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Should you prefer "PI" (or "pi") then use the module like this:
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use plplot, pi => pl_pi
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- PL_GRID_CSA, PL_GRID_DTLI, PL_GRID_NNI, PL_GRID_NNIDW, PL_GRID_NNLI,
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Parameters that select the gridding algorithm for PLGRIDDATA
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- PL_JUST_NONE, PL_JUST_OPTIMAL, PL_JUST_SAME, PL_JUST_ISOMETRIC:
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The justification of axes in PLENV. The names should be more or
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less self-explanatory.
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- PL_AXIS_NOTHING - no decoration for the axis
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PL_AXIS_BOX_ONLY - only the axles
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PL_AXIS_NORMAL = ordinary axes
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PL_AXIS_ATZERO = include lines through 0-coordinates
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PL_AXIS_MAJORGRID = include grid for major tickmarks
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PL_AXIS_MINORGRID = include grid for major and minor tickmarks
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PL_AXIS_LOGX = use logarithmic X axis
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PL_AXIS_LOGY = use logarithmic Y axis
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PL_AXIS_LOGXY = both axes logarithmic
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You can combine the logarithmic options with the others
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(except PL_AXIS_NOTHING and PL_AXIS_BOX_ONLY) by simply
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adding them: PL_AXIS_LOGX+AXIS_MAJORGRID for instance
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To illustrate the alternative interfaces for various routines,
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here are the possibilities to call PLBIN
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plbin(PLINT nbin, PLFLT *x, PLFLT *y, PLINT center);
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Because in Fortran 95, the size of the array can be queried via the SIZE
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intrinsic function, we can drop the nbin argument. And while C has no
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specific logical data type, Fortran has. So there are four ways to call
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PLBIN from Fortran 95:
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integer :: icenter, nbin
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real(kind=plflt), dimension(:) :: x, y
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! Fortran 95, method 1 (compatible with FORTRAN 77)
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call plbin( nbin, x, y, icenter )
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! Fortran 95, method 2
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call plbin( x, y, center ) ! Drop the argument nbin, use a logical for center
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! Fortran 95, method 3
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call plbin( x, y, icenter ) ! No nbin, use an integer for center
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! Fortran 95, method 4
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call plbin( nbin, x, y, center ) ! Use nbin, use a logical for center
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Method 2 is preferred, as it is most "Fortran 95" in character.
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bindings/f95/readme_f95.txt
