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|
(*
3-d plot demo.
Copyright (C) 2004 Alan W. Irwin
Copyright (C) 2004 Rafael Laboissiere
Copyright (C) 2008 Hezekiah M. Carty
This file is part of PLplot.
PLplot is free software; you can redistribute it and/or modify
it under the terms of the GNU Library General Public License as published
by the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
PLplot is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with PLplot; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*)
open Plplot
let pi = atan 1.0 *. 4.0
let xpts = 35 (* Data points in x *)
let ypts = 45 (* Data points in y *)
let alt = [|60.0; 40.0|]
let az = [|30.0; -30.0|]
let title =
[|
"#frPLplot Example 8 - Alt=60, Az=30";
"#frPLplot Example 8 - Alt=40, Az=-30";
|]
(*--------------------------------------------------------------------------*\
* cmap1_init1
*
* Initializes color map 1 in HLS space.
* Basic grayscale variation from half-dark (which makes more interesting
* looking plot compared to dark) to light.
* An interesting variation on this:
* s[1] = 1.0
\*--------------------------------------------------------------------------*)
let cmap1_init gray =
let i = [|0.0; 1.0|] in (* left and right boundaries *)
let h, l, s =
if gray then (
[|0.0; 0.0|], (* hue -- low: red (arbitrary if s=0) *)
(* hue -- high: red (arbitrary if s=0) *)
[|0.5; 1.0|], (* lightness -- low: half-dark *)
(* lightness -- high: light *)
[|0.0; 0.0|] (* minimum saturation *)
(* minimum saturation *)
)
else (
[|240.0; 0.0|], (* blue -> green -> yellow -> *)
(* -> red *)
[|0.6; 0.6|],
[|0.8; 0.8|]
)
in
plscmap1n 256;
plscmap1l false i h l s None;
()
let levels = 10
(*--------------------------------------------------------------------------*\
* Does a series of 3-d plots for a given data set, with different
* viewing options in each plot.
\*--------------------------------------------------------------------------*)
let () =
let nlevel = levels in
let rosen = false in
(* Parse and process command line arguments *)
plparseopts Sys.argv [PL_PARSE_FULL];
(* Initialize plplot *)
plinit ();
(* Allocate data structures *)
let z = Array.make_matrix xpts ypts 0.0 in
(* initialize to large value to make sure index limits are working correctly *)
let z_limited = Array.make_matrix xpts ypts 1.e30 in
let x =
Array.init xpts (
fun i ->
(float_of_int (i - (xpts / 2)) /. float_of_int (xpts / 2)) *.
if rosen then
1.5
else
1.0
)
in
let y =
Array.init ypts (
fun i ->
float_of_int (i - (ypts / 2)) /. float_of_int (ypts / 2) +.
if rosen then
0.5
else
0.0
)
in
for i = 0 to xpts - 1 do
let xx = x.(i) in
for j = 0 to ypts - 1 do
let yy = y.(j) in
if rosen then (
z.(i).(j) <- (1.0 -. xx)**2. +. 100. *. (yy -. xx**2.)**2.0;
(* The log argument may be zero for just the right grid. *)
if z.(i).(j) > 0.0 then
z.(i).(j) <- log z.(i).(j)
else
z.(i).(j) <- -5. (* -MAXFLOAT would mess-up up the scale *)
)
else (
let r = sqrt (xx *. xx +. yy *. yy) in
z.(i).(j) <- exp (-.r *. r) *. cos (2.0 *. pi *. r)
)
done
done;
let indexxmin = 0 in
let indexxmax = xpts in
let indexymin = Array.make indexxmax 0 in
let indexymax = Array.make indexxmax ypts in
(* parameters of ellipse (in x, y index coordinates) that limits the data.
x0, y0 correspond to the exact floating point centre of the index range. *)
let x0 = 0.5 *. float_of_int ( xpts - 1 ) in
let a = 0.9 *. x0 in
let y0 = 0.5 *. float_of_int( ypts - 1 ) in
let b = 0.7 *. y0 in
for i = indexxmin to indexxmax - 1 do
let square_root = sqrt ( 1. -. (min 1. ((( float_of_int i -. x0 ) /. a)**2.))) in
(* Add 0.5 to find nearest integer and therefore preserve symmetry
with regard to lower and upper bound of y range. *)
indexymin.(i) <- max 0 (int_of_float (0.5 +. y0 -. b *. square_root));
(* indexymax calculated with the convention that it is 1
greater than highest valid index. *)
indexymax.(i) <- min ypts (1 + int_of_float (0.5 +. y0 +. b *. square_root));
for j = indexymin.(i) to indexymax.(i) - 1 do
z_limited.(i).(j) <- z.(i).(j)
done
done;
let zmax, zmin = plMinMax2dGrid z in
let step = (zmax -. zmin) /. float_of_int (nlevel + 1) in
let clevel =
Array.init nlevel (fun i -> zmin +. step +. step *. float_of_int i)
in
pllightsource 1.0 1.0 1.0;
for k = 0 to 1 do
for ifshade = 0 to 4 do
pladv 0;
plvpor 0.0 1.0 0.0 0.9;
plwind (-1.0) 1.0 (-0.9) 1.1;
plcol0 3;
plmtex "t" 1.0 0.5 0.5 title.(k);
plcol0 1;
if rosen then
plw3d 1.0 1.0 1.0 (-1.5) 1.5 (-0.5) 1.5 zmin zmax alt.(k) az.(k)
else
plw3d 1.0 1.0 1.0 (-1.0) 1.0 (-1.0) 1.0 zmin zmax alt.(k) az.(k);
plbox3 "bnstu" "x axis" 0.0 0
"bnstu" "y axis" 0.0 0
"bcdmnstuv" "z axis" 0.0 0;
plcol0 2;
match ifshade with
0 -> (* diffuse light surface plot *)
cmap1_init true;
plsurf3d x y z [PL_DIFFUSE] [||];
| 1 -> (* magnitude colored plot *)
cmap1_init false;
plsurf3d x y z [PL_MAG_COLOR] [||];
| 2 -> (* magnitude colored plot with faceted
squares *)
cmap1_init false;
plsurf3d x y z [PL_MAG_COLOR; PL_FACETED] [||];
| 3 -> (* magnitude colored plot with contours and index limits*)
cmap1_init false;
plsurf3d x y z [PL_MAG_COLOR; PL_SURF_CONT; PL_BASE_CONT] clevel;
| _ -> (* magnitude colored plot with contours *)
cmap1_init false;
plsurf3dl x y z [PL_MAG_COLOR; PL_SURF_CONT; PL_BASE_CONT] clevel indexxmin indexymin indexymax;
done
done;
(* Clean up *)
plend ();
()
|
