-- Bar chart demo.

-- Copyright (C) 2006 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,
    Ada.Strings,
    Ada.Strings.Fixed,
    PLplot_Auxiliary,
    PLplot_Standard;
use
    Ada.Numerics,
    Ada.Numerics.Long_Elementary_Functions,
    Ada.Strings,
    Ada.Strings.Fixed,
    PLplot_Auxiliary,
    PLplot_Standard;

------------------------------------------------------------------------------
-- Does a simple bar chart, using color fill.  If color fill is
-- unavailable, pattern fill is used instead (automatic).
------------------------------------------------------------------------------

procedure xstandard12a is
    y0 : Real_Vector (0 .. 9);
    pos : Real_Vector (0 .. 4) := (0.0, 0.25, 0.5, 0.75, 1.0);
    r   : Real_Vector (0 .. 4) := (0.0, 0.25, 0.5, 1.0,  1.0);
    g   : Real_Vector (0 .. 4) := (1.0, 0.5,  0.5, 0.5,  1.0);
    b   : Real_Vector (0 .. 4) := (1.0, 1.0,  0.5, 0.25, 0.0);

    procedure plfbox (x0, y0 : Long_Float) is
        x, y : Real_Vector (0 ..3);
    begin
        x(0) := x0;
        y(0) := 0.0;

        x(1) := x0;
        y(1) := y0;

        x(2) := x0 + 1.0;
        y(2) := y0;

        x(3) := x0 + 1.0;
        y(3) := 0.0;

        Fill_Polygon(x, y);
        Set_Pen_Color(Red);
        Select_Line_Style(1);
        Draw_Curve(x, y);
    end plfbox;

 begin
    -- Parse and process command line arguments.
    Parse_Command_Line_Arguments(Parse_Full);

    -- Initialize plplot.
    Initialize_PLplot;

    Advance_To_Subpage(Next_Subpage);
    Set_Viewport_Standard;
    Set_Viewport_World(1980.0, 1990.0, 0.0, 35.0);
    Box_Around_Viewport("bc", 1.0, 0, "bcnv", 10.0, 0);
    Set_Pen_Color(Yellow);
    Write_Labels("Year", "Widget Sales (millions)", "#frPLplot Example 12");

    y0(0) :=  5.0;
    y0(1) := 15.0;
    y0(2) := 12.0;
    y0(3) := 24.0;
    y0(4) := 28.0;
    y0(5) := 30.0;
    y0(6) := 20.0;
    y0(7) :=  8.0;
    y0(8) := 12.0;
    y0(9) :=  3.0;

    Set_Color_Map_1_Piecewise(RGB, pos, r, g, b, Alt_Hue_Path_None);

    for i in y0'range loop
        Set_Color_Map_1(Long_Float(i)/9.0);
        Select_Fill_Pattern(0);
        plfbox((1980.0 + Long_Float(i)), y0(i));
        Write_Text_World(1980.0 + Long_Float(i) + 0.5, y0(i) + 1.0, 1.0, 0.0, 0.5, Trim(Integer'image(Integer(y0(i))), Left));
        Write_Text_Viewport("b", 1.0, (Long_Float(i) + 1.0) * 0.1 - 0.05, 0.5, Trim(Integer'image(1980 + i), Left));
    end loop;

    -- Don't forget to call End_PLplot to finish off!
    End_PLplot;
end xstandard12a;