/usr/share/doc/libplplot12/examples/ocaml/x01.ml is in libplplot-dev 5.10.0+dfsg-1.
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Simple line plot and multiple windows demo. A fairly straightforward
translation from the original C to OCaml.
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
open Printf
type ex1_params = {
xscale : float;
yscale : float;
xoff : float;
yoff : float;
}
let pi = atan 1.0 *. 4.0
(*
/* Variables and data arrays used by plot generators */
static PLFLT x[101], y[101];
static PLFLT xscale, yscale, xoff, yoff, xs[6], ys[6];
static PLGraphicsIn gin;
static int locate_mode;
static int test_xor;
static int fontset = 1;
static char *f_name = NULL;
/* Options data structure definition. */
static PLOptionTable options[] = {
{
"locate", /* Turns on test of API locate function */
NULL,
NULL,
&locate_mode,
PL_OPT_BOOL,
"-locate",
"Turns on test of API locate function" },
{
"xor", /* Turns on test of xor function */
NULL,
NULL,
&test_xor,
PL_OPT_BOOL,
"-xor",
"Turns on test of XOR" },
{
"font", /* For switching between font set 1 & 2 */
NULL,
NULL,
&fontset,
PL_OPT_INT,
"-font number",
"Selects stroke font set (0 or 1, def:1)" },
{
"save", /* For saving in postscript */
NULL,
NULL,
&f_name,
PL_OPT_STRING,
"-save filename",
"Save plot in color postscript `file'" },
{
NULL, /* option */
NULL, /* handler */
NULL, /* client data */
NULL, /* address of variable to set */
0, /* mode flag */
NULL, /* short syntax */
NULL } /* long syntax */
};
const char *notes[] = {"Make sure you get it right!", NULL};
*)
let plot1 (do_test, test_xor) params =
let x =
Array.init 60 (
fun i ->
params.xoff +. params.xscale *. (float_of_int i +. 1.0) /. 60.0
)
in
let y =
Array.init 60 (
fun i ->
params.yoff +. params.yscale *. x.(i) ** 2.0
)
in
let xmin = x.(0) in
let xmax = x.(59) in
let ymin = y.(0) in
let ymax = y.(59) in
let xs = Array.init 6 (fun i -> x.(i * 10 + 3)) in
let ys = Array.init 6 (fun i -> y.(i * 10 + 3)) in
(* Set up the viewport and window using PLENV. The range in X is
0.0 to 6.0, and the range in Y is 0.0 to 30.0. The axes are
scaled separately (just = 0), and we just draw a labelled
box (axis = 0). *)
plcol0 1;
plenv xmin xmax ymin ymax 0 0;
plcol0 2;
pllab "(x)" "(y)" "#frPLplot Example 1 - y=x#u2";
(* Plot the data points *)
plcol0 4;
plpoin xs ys 9;
(* Draw the line through the data *)
plcol0 3;
plline x y;
(* COMMENT THIS SECTION OUT FOR NOW, AS IT DOES NOT FUNCTION EXACTLY
AS THE C EXAMPLE.
(* xor mode enable erasing a line/point/text by replotting it again *)
(* it does not work in double buffering mode, however *)
let () =
if do_test && test_xor then
let st = plxormod 1 in (* enter xor mode *)
if st > 0 then begin
for i = 1 to 10 do
let i' = i * 6 - 6 in
plpoin (Array.sub x i' 1) (Array.sub y i' 1) 9; (* draw a point *)
Unix.sleep 1; (* wait a little *)
plflush (); (* force an update of the driver *)
plpoin (Array.sub x i' 1) (Array.sub y i' 1) 9; (* erase point *)
done;
ignore (plxormod 0) (* leave xor mode *)
end
else
print_endline "xor mode not supported."
in
END BIG BLOCK COMMENT *)
(* All done. *)
()
let plot2 () =
(* Set up the viewport and window using PLENV. The range in X is -2.0 to
10.0, and the range in Y is -0.4 to 2.0. The axes are scaled separately
(just = 0), and we draw a box with axes (axis = 1). *)
plcol0 1;
plenv (-2.0) 10.0 (-0.4) 1.2 0 1;
plcol0 2;
pllab "(x)" "sin(x)/x" "#frPLplot Example 1 - Sinc Function";
(* Fill up the arrays *)
let x = Array.init 100 (fun i -> (float_of_int i -. 19.0) /. 6.0) in
let y =
Array.init 100 (
fun i ->
if x.(i) <> 0.0 then
sin x.(i) /. x.(i)
else
1.0
)
in
(* Draw the line *)
plcol0 3;
plwidth 2.0;
plline x y;
plwidth 1.0;
(* All done. *)
()
let plot3 () =
let space1 = 1500 in
let mark1 = 1500 in
(* For the final graph we wish to override the default tick intervals, and
so do not use plenv(). *)
pladv 0;
(* Use standard viewport, and define X range from 0 to 360 degrees, Y range
from -1.2 to 1.2.*)
plvsta ();
plwind 0.0 360.0 (-1.2) 1.2;
(* Draw a box with ticks spaced 60 degrees apart in X, and 0.2 in Y. *)
plcol0 1;
plbox "bcnst" 60.0 2 "bcnstv" 0.2 2;
(* Superimpose a dashed line grid, with 1.5 mm marks and spaces.
plstyl expects a pointer!*)
plstyl [|mark1|] [|space1|];
plcol0 2;
plbox "g" 30.0 0 "g" 0.2 0;
plstyl [||] [||];
plcol0 3;
pllab "Angle (degrees)" "sine" "#frPLplot Example 1 - Sine function";
let x = Array.init 101 (fun i -> 3.6 *. float_of_int i) in
let y = Array.init 101 (fun i -> sin (x.(i) *. pi /. 180.0)) in
plcol0 4;
plline x y;
(* All done. *)
()
(*--------------------------------------------------------------------------*\
* main
*
* Generates several simple line plots. Demonstrates:
* - subwindow capability
* - setting up the window, drawing plot, and labelling
* - changing the color
* - automatic axis rescaling to exponential notation
* - placing the axes in the middle of the box
* - gridded coordinate axes
\*--------------------------------------------------------------------------*)
let main fontset =
(* plplot initialization *)
(* NOT IMPLEMENTED YET
(* Parse and process command line arguments *)
plMergeOpts(options, "x01c options", notes);
*)
plparseopts Sys.argv [PL_PARSE_FULL];
(* Get version number, just for kicks *)
let plplot_version = plgver () in
fprintf stdout "PLplot library version: %s\n" plplot_version;
(* Initialize plplot *)
(* Divide page into 2x2 plots *)
plstar 2 2;
(* Select font set as per input flag *)
plfontld (if fontset then 1 else 0);
(* Set up the data *)
(* Original case *)
let plot1_params =
{
xscale = 6.0;
yscale = 1.0;
xoff = 0.0;
yoff = 0.0;
}
in
(* Do a plot *)
plot1 (false, false) plot1_params;
(* Set up the data *)
let plot1_params =
{
plot1_params with
xscale = 1.0;
yscale = 0.0014;
yoff = 0.0185;
}
in
(* Do a plot *)
let digmax = 5 in
plsyax digmax 0;
plot1 (true, true) plot1_params;
plot2 ();
plot3 ();
(* NOT IMPLEMENTED YET
(*
* Show how to save a plot:
* Open a new device, make it current, copy parameters,
* and replay the plot buffer
*)
if (f_name) { /* command line option '-save filename' */
printf("The current plot was saved in color Postscript under the name `%s'.\n", f_name);
plgstrm(&cur_strm); /* get current stream */
plmkstrm(&new_strm); /* create a new one */
plsfnam(f_name); /* file name */
plsdev("psc"); /* device type */
plcpstrm(cur_strm, 0); /* copy old stream parameters to new stream */
plreplot(); /* do the save by replaying the plot buffer */
plend1(); /* finish the device */
plsstrm(cur_strm); /* return to previous stream */
}
/* Let's get some user input */
if (locate_mode) {
for (;;) {
if (! plGetCursor(&gin)) break;
if (gin.keysym == PLK_Escape) break;
pltext();
if (gin.keysym < 0xFF && isprint(gin.keysym))
printf("subwin = %d, wx = %f, wy = %f, dx = %f, dy = %f, c = '%c'\n",
gin.subwindow, gin.wX, gin.wY, gin.dX, gin.dY, gin.keysym);
else
printf("subwin = %d, wx = %f, wy = %f, dx = %f, dy = %f, c = 0x%02x\n",
gin.subwindow, gin.wX, gin.wY, gin.dX, gin.dY, gin.keysym);
plgra();
}
}
*)
(* Don't forget to call plend() to finish off! *)
plend ();
()
let () = main true
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