/usr/share/doc/libplplot12/examples/ada/xthick18a.adb is in libplplot-ada1-dev 5.10.0+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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-- 3-d line and point plot demo. Adapted from x08c.c.
-- Copyright (C) 2008 - 2011 Jerry Bauck
-- 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
with
Ada.Numerics,
System,
Ada.Numerics.Long_Elementary_Functions,
Ada.Strings,
Ada.Strings.Fixed,
PLplot_Auxiliary,
PLplot;
use
Ada.Numerics,
Ada.Numerics.Long_Elementary_Functions,
Ada.Strings,
Ada.Strings.Fixed,
PLplot_Auxiliary,
PLplot;
procedure xthick18a is
----------------------------------------------------------------------------
-- Does a series of 3-d plots for a given data set, with different
-- viewing options in each plot.
----------------------------------------------------------------------------
opt : array(0 .. 3) of Boolean := (True, False, True, False);
alt : Real_Vector(0 .. 3) := (20.0, 35.0, 50.0, 65.0);
az : Real_Vector(0 .. 3) := (30.0, 40.0, 50.0, 60.0);
NPTS : constant Integer := 1000;
x, y, z : Real_Vector(0 .. NPTS - 1);
r : Long_Float;
procedure test_poly(k : Integer) is
x, y, z : Real_Vector(0 .. 4);
Two_Pi : Long_Float := 2.0 * pi;
draw : array(0 .. 3) of Boolean_Array_1D(0 .. 3);
function THETA(a : Integer) return Long_Float is
begin
return Two_Pi * Long_Float(a) / 20.0;
end;
function PHI(a : Integer) return Long_Float is
begin
return pi * Long_Float(a) / 20.1;
end;
begin
draw(0) := (True, True, True, True);
draw(1) := (True, False, True, False);
draw(2) := (False, True, False, True);
draw(3) := (True, True, False, False);
Advance_To_Subpage(Next_Subpage);
Set_Viewport_Normalized(0.0, 1.0, 0.0, 0.9);
Set_Viewport_World(-1.0, 1.0, -0.9, 1.1);
Set_Pen_Color(Red);
Set_Up_3D(1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, alt(k), az(k));
Box_Around_Viewport_3D("bnstu", "x axis", 0.0, 0,
"bnstu", "y axis", 0.0, 0,
"bcdmnstuv", "z axis", 0.0, 0);
Set_Pen_Color(Yellow);
for i in 0 .. 19 loop
for j in 0 .. 19 loop
x(0) := sin(PHI(j)) * cos(THETA(i));
y(0) := sin(PHI(j)) * sin(THETA(i));
z(0) := cos(PHI(j));
x(1) := sin(PHI(j + 1)) * cos(THETA(i));
y(1) := sin(PHI(j + 1)) * sin(THETA(i));
z(1) := cos(PHI(j + 1));
x(2) := sin(PHI(j + 1)) * cos(THETA(i + 1));
y(2) := sin(PHI(j + 1)) * sin(THETA(i + 1));
z(2) := cos(PHI(j + 1));
x(3) := sin(PHI(j)) * cos(THETA(i + 1));
y(3) := sin(PHI(j)) * sin(THETA(i + 1));
z(3) := cos(PHI(j));
x(4) := sin(PHI(j)) * cos(THETA(i));
y(4) := sin(PHI(j)) * sin(THETA(i));
z(4) := cos(PHI(j));
Draw_Polygon_3D(x, y, z, draw(k), True );
end loop;
end loop;
Set_Pen_Color(Green);
Write_Text_Viewport("t", 1.0, 0.5, 0.5, "unit radius sphere" );
end test_poly;
begin
-- Parse and process command line arguments
Parse_Command_Line_Arguments(Parse_Full);
-- Initialize plplot
Initialize_PLplot;
for k in 0 .. 3 loop
test_poly(k);
end loop;
-- From the mind of a sick and twisted physicist...
for i in x'range loop
z(i) := -1.0 + 2.0 * Long_Float(i) / Long_Float(NPTS);
-- Pick one...
r := z(i);
x(i) := r * cos( 2.0 * pi * 6.0 * Long_Float(i) / Long_Float(NPTS) );
y(i) := r * sin( 2.0 * pi * 6.0 * Long_Float(i) / Long_Float(NPTS) );
end loop;
for k in opt'range loop
Advance_To_Subpage(Next_Subpage);
Set_Viewport_Normalized(0.0, 1.0, 0.0, 0.9);
Set_Viewport_World(-1.0, 1.0, -0.9, 1.1);
Set_Pen_Color(Red);
Set_Up_3D(1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, alt(k), az(k));
Box_Around_Viewport_3D("bnstu", "x axis", 0.0, 0,
"bnstu", "y axis", 0.0, 0,
"bcdmnstuv", "z axis", 0.0, 0);
Set_Pen_Color(Yellow);
if opt(k) then
Draw_Curve_3D(x, y, z);
else
Draw_String_3D(x, y, z, "⋅");
end if;
Set_Pen_Color(Green);
Write_Text_Viewport("t", 1.0, 0.5, 0.5, "#frPLplot Example 18 - Alt=" &
Trim(Integer'image(Integer(alt(k))), Left) & ", Az=" &
Trim(Integer'image(Integer( az(k))), Left));
end loop;
End_PLplot;
end xthick18a;
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