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-- Pie chart demo.
-- Copyright (C) 2008 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,
Ada.Numerics.Long_Elementary_Functions,
PLplot_Auxiliary,
PLplot_Standard;
use
Ada.Numerics,
Ada.Numerics.Long_Elementary_Functions,
PLplot_Auxiliary,
PLplot_Standard;
------------------------------------------------------------------------------
-- Does a simple pie chart.
------------------------------------------------------------------------------
procedure xstandard13a is
j, dthet, theta0, theta1, theta : Integer;
just, dx, dy : Long_Float;
x, y : Real_Vector(0 .. 499);
per : Real_Vector(0 .. 4) := (10.0, 32.0, 12.0, 30.0, 16.0);
begin
-- Parse and process command line arguments
Parse_Command_Line_Arguments(Parse_Full);
-- Initialize plplot
Initialize_PLplot;
Advance_To_Subpage(Next_Subpage);
-- Ensure window has aspect ratio of one so circle is plotted as a circle.
Set_Viewport_Aspect_Ratio(1.0);
Set_Viewport_World(0.0, 10.0, 0.0, 10.0);
-- Set_Environment(0.0, 10.0, 0.0, 10.0, Justified, No_Box);
Set_Pen_Color(Yellow);
-- n.b. all theta quantities scaled by 2 * pi / 500 to be integers to avoid
-- floating point logic problems.
theta0 := 0;
dthet := 1;
for i in per'range loop
j := 0;
x(j) := 5.0;
y(j) := 5.0;
j := j + 1;
-- n.b. the theta quantities multiplied by 2 * pi / 500 afterward so
-- in fact per is interpreted as a percentage.
theta1 := Integer(Long_Float(theta0) + 5.0 * per(i));
if i = 4 then
theta1 := 500;
end if;
theta := theta0;
while theta <= theta1 loop
x(j) := 5.0 + 3.0 * cos((2.0 * pi / 500.0) * Long_Float(theta));
y(j) := 5.0 + 3.0 * sin((2.0 * pi / 500.0) * Long_Float(theta));
j := j + 1;
theta := theta + dthet;
end loop;
Set_Pen_Color(i + 1);
Select_Fill_Pattern((i + 3) mod 8 + 1);
declare
x_Temp, y_Temp : Real_Vector(0 .. j - 1);
begin
x_Temp := x(0 .. j - 1);
y_Temp := y(0 .. j - 1);
Fill_Polygon(x_Temp, y_Temp);
Set_Pen_Color(Red);
Draw_Curve(x_Temp, y_Temp);
end;
just := (2.0 * pi / 500.0) * Long_Float((theta0 + theta1))/2.0;
dx := 0.25 * cos(just);
dy := 0.25 * sin(just);
if (theta0 + theta1) < 250 or (theta0 + theta1) > 750 then
just := 0.0;
else
just := 1.0;
end if;
if i = 0 then
Write_Text_World(x(j / 2) + dx, y(j / 2) + dy, 1.0, 0.0, just, "Maurice");
elsif i = 1 then
Write_Text_World(x(j / 2) + dx, y(j / 2) + dy, 1.0, 0.0, just, "Geoffrey");
elsif i = 2 then
Write_Text_World(x(j / 2) + dx, y(j / 2) + dy, 1.0, 0.0, just, "Alan");
elsif i = 3 then
Write_Text_World(x(j / 2) + dx, y(j / 2) + dy, 1.0, 0.0, just, "Rafael");
elsif i = 4 then
Write_Text_World(x(j / 2) + dx, y(j / 2) + dy, 1.0, 0.0, just, "Vince");
end if;
theta0 := theta - dthet;
end loop;
Set_Font_Style(Roman_Font);
Set_Character_Height(0.0, 1.3);
Write_Text_World(5.0, 9.0, 1.0, 0.0, 0.5, "Percentage of Sales");
-- Don't forget to call PLEND to finish off!
End_PLplot;
end xstandard13a;
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