/usr/share/doc/libplplot11/examples/ocaml/x15.ml is in libplplot-dev 5.9.9-2ubuntu2.
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Shade plot demo.
Maurice LeBrun
IFS, University of Texas at Austin
31 Aug 1993
*)
open Plplot
let xpts = 35 (* Data points in x *)
let ypts = 46 (* Data points in y *)
(*--------------------------------------------------------------------------*\
* cmap1_init1
*
* Initializes color map 1 in HLS space.
\*--------------------------------------------------------------------------*)
let cmap1_init1 () =
let i = [|0.0; 0.45; 0.55; 1.0|] in
let h = [|260.0; 260.0; 20.0; 20.0|] in
let l = [|0.5; 0.0; 0.0; 0.5|] in
let s = [|1.0; 1.0; 1.0; 1.0|] in
plscmap1l false i h l s None;
()
(*--------------------------------------------------------------------------*\
* cmap1_init2
*
* Initializes color map 1 in HLS space.
\*--------------------------------------------------------------------------*)
let cmap1_init2 () =
let i = [|0.0; 0.45; 0.55; 1.0|] in
let h = [|260.0; 260.0; 20.0; 20.0|] in
let l = [|0.6; 0.0; 0.0; 0.6|] in
let s = [|1.0; 0.5; 0.5; 1.0|] in
plscmap1l false i h l s None;
()
(*--------------------------------------------------------------------------*\
* plot1
*
* Illustrates a single shaded region.
\*--------------------------------------------------------------------------*)
let plot1 z zmin zmax =
let sh_cmap = 0 in
pladv 0;
plvpor 0.1 0.9 0.1 0.9;
plwind (-1.0) 1.0 (-1.0) 1.0;
(* Plot using identity transform *)
let shade_min = zmin +. (zmax -. zmin) *. 0.4 in
let shade_max = zmin +. (zmax -. zmin) *. 0.6 in
let sh_color = 7.0 in
let sh_width = 2 in
let min_color = 9 in
let max_color = 2 in
let min_width = 2 in
let max_width = 2 in
plpsty 8;
plshade
z (-1.0) 1.0 (-1.0) 1.0
shade_min shade_max
sh_cmap sh_color sh_width
min_color min_width max_color max_width true;
plcol0 1;
plbox "bcnst" 0.0 0 "bcnstv" 0.0 0;
plcol0 2;
pllab "distance" "altitude" "Bogon flux";
()
(*--------------------------------------------------------------------------*\
* plot2
*
* Illustrates multiple adjacent shaded regions, using different fill
* patterns for each region.
\*--------------------------------------------------------------------------*)
let plot2 z zmin zmax =
let sh_cmap = 0 in
let min_color = 0 in
let min_width = 0 in
let max_color = 0 in
let max_width = 0 in
let sh_width = 2 in
let inc =
[|
[|450|]; [|-450|]; [|0|]; [|900|];
[|300|]; [|450;-450|]; [|0; 900|]; [|0; 450|];
[|450; -450|]; [|0; 900|];
|]
in
let del =
[|
[|2000|]; [|2000|]; [|2000|];
[|2000|]; [|2000|]; [|2000; 2000|];
[|2000; 2000|]; [|2000; 2000|]; [|4000; 4000|];
[|4000; 2000|];
|]
in
pladv 0;
plvpor 0.1 0.9 0.1 0.9;
plwind (-1.0) 1.0 (-1.0) 1.0;
(* Plot using identity transform *)
for i = 0 to 9 do
let shade_min = zmin +. (zmax -. zmin) *. float_of_int i /. 10.0 in
let shade_max = zmin +. (zmax -. zmin) *. float_of_int (i + 1) /. 10.0 in
let sh_color = float_of_int (i + 6) in
plpat inc.(i) del.(i);
plshade
z (-1.0) 1.0 (-1.0) 1.0
shade_min shade_max
sh_cmap sh_color sh_width
min_color min_width max_color max_width true;
done;
plcol0 1;
plbox "bcnst" 0.0 0 "bcnstv" 0.0 0;
plcol0 2;
pllab "distance" "altitude" "Bogon flux";
()
(*--------------------------------------------------------------------------*\
* plot3
*
* Illustrates shaded regions in 3d, using a different fill pattern for
* each region.
\*--------------------------------------------------------------------------*)
let plot3 () =
let xx =
[|
[|-1.0; 1.0; 1.0; -1.0; -1.0|];
[|-1.0; 1.0; 1.0; -1.0; -1.0|];
|]
in
let yy =
[|
[|1.0; 1.0; 0.0; 0.0; 1.0|];
[|-1.0; -1.0; 0.0; 0.0; -1.0|];
|]
in
let zz =
[|
[|0.0; 0.0; 1.0; 1.0; 0.0|];
[|0.0; 0.0; 1.0; 1.0; 0.0|];
|]
in
pladv 0;
plvpor 0.1 0.9 0.1 0.9;
plwind (-1.0) 1.0 (-1.0) 1.0;
plw3d 1.0 1.0 1.0 (-1.0) 1.0 (-1.0) 1.0 0.0 1.5 30.0 (-40.0);
(* Plot using identity transform *)
plcol0 1;
plbox3 "bntu" "X" 0.0 0 "bntu" "Y" 0.0 0 "bcdfntu" "Z" 0.5 0;
plcol0 2;
pllab "" "" "3-d polygon filling";
plcol0 3;
plpsty 1;
plline3 xx.(0) yy.(0) zz.(0);
let sub a = Array.sub a 0 4 in
plfill3 (sub xx.(0)) (sub yy.(0)) (sub zz.(0));
plpsty 2;
plline3 xx.(1) yy.(1) zz.(1);
plfill3 (sub xx.(1)) (sub yy.(1)) (sub zz.(1));
()
(*--------------------------------------------------------------------------*\
* Does a variety of shade plots.
\*--------------------------------------------------------------------------*)
let () =
(* Parse and process command line arguments *)
plparseopts Sys.argv [PL_PARSE_FULL];
(* Set up color map 1 *)
cmap1_init2 ();
(* Initialize plplot *)
plinit ();
(* Set up data array *)
let z = Array.make_matrix xpts ypts 0.0 in
for i = 0 to xpts - 1 do
let xx = float_of_int (i - (xpts / 2)) /. float_of_int (xpts / 2) in
for j = 0 to ypts - 1 do
let yy =
float_of_int (j - (ypts / 2)) /. float_of_int (ypts / 2) -. 1.0
in
z.(i).(j) <-
xx *. xx -. yy *. yy +. (xx -. yy) /. (xx *. xx +. yy *. yy +. 0.1);
done
done;
let zmax, zmin = plMinMax2dGrid z in
plot1 z zmin zmax;
plot2 z zmin zmax;
plot3 ();
plend ();
()
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