-- Multiple window and color map 0 demo.

-- Copyright (C) 2007 Alan W. Irwin

-- 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;

------------------------------------------------------------------------------
-- Demonstrates multiple windows and color map 0 palette, both default and
-- user-modified.
------------------------------------------------------------------------------

procedure xstandard02a is
    --------------------------------------------------------------------------
    -- draw_windows
    -- Draws a set of numbered boxes with colors according to cmap0 entry.
    --------------------------------------------------------------------------

    procedure draw_windows(nw, cmap0_offset : Integer) is
        vmin, vmax : Long_Float;

    begin
        Set_Character_Height(0.0, 3.5);
        Set_Font_Style(Script_Font);

        for i in 0..(nw-1) loop
            Set_Pen_Color(i+cmap0_offset);
            Advance_To_Subpage(Next_Subpage);
            vmin := 0.1;
            vmax := 0.9;
            for j in 0..2 loop
                Set_Pen_Width(Long_Float(j + 1));
                Set_Viewport_Normalized(vmin, vmax, vmin, vmax);
                Set_Viewport_World(0.0, 1.0, 0.0, 1.0);
                Box_Around_Viewport("bc", 0.0, 0, "bc", 0.0, 0);
                vmin := vmin + 0.1;
                vmax := vmax - 0.1;
            end loop;
            Set_Pen_Width(1.0);
            Write_Text_World(0.5, 0.5, 1.0, 0.0, 0.5, Trim(Integer'image(i), Left));
        end loop;
    end draw_windows;

    --------------------------------------------------------------------------
    -- demo1
    -- Demonstrates multiple windows and default color map 0 palette.
    --------------------------------------------------------------------------

    procedure demo1 is
    begin
        Begin_New_Page;

        -- Divide screen into 16 regions
        Set_Number_Of_Subpages(4, 4);
        draw_windows(16, 0);
        Eject_Current_Page;
    end demo1;

    --------------------------------------------------------------------------
    -- demo2
    -- Demonstrates multiple windows, user-modified color map 0 palette, and
    -- HLS -> RGB translation.
    --------------------------------------------------------------------------

    procedure demo2 is
        -- Set up cmap0
        -- Use 100 custom colors in addition to base 16
        r, g, b: Integer_Array_1D(0..115);

        -- Min & max lightness values
        lmin : Long_Float := 0.15;
        lmax : Long_Float := 0.85;
        h, l, s : Long_Float;
        r1, g1, b1 : Long_Float;
    begin
        Begin_New_Page;

        -- Divide screen into 100 regions.
        Set_Number_Of_Subpages(10, 10);

        for i in 0..99 loop

            -- Bounds on HLS, from Set_Color_HLSrgb() commentary
            -- hue        [0., 360.] degrees
            -- lightness  [0., 1.]   magnitude
            -- saturation [0., 1.]   magnitude

            -- Vary hue uniformly from left to right
            h := (360.0 / 10.0 ) * Long_Float( i mod 10 );

            -- Vary lightness uniformly from top to bottom, between min & max.
            l := lmin + (lmax - lmin) * Long_Float(i / 10) / 9.0;

            -- Use max saturation.
            s := 1.0;

            HLS_To_RGB(h, l, s, r1, g1, b1);

            -- Ada rounds to nearest integer.  We want to truncate
            -- approximately like C to match that example.  -0.5 produces
            -- at least one -1 result (rather than zero) so we subtract
            -- something with a slightly smaller absolute value.
            r(i+16) := Integer((r1 * 255.001) - 0.499999999999999);
            g(i+16) := Integer((g1 * 255.001) - 0.499999999999999);
            b(i+16) := Integer((b1 * 255.001) - 0.499999999999999);
        end loop;

        -- Load default cmap0 colors into our custom set.
        for i in 0..15 loop
            Get_Color_RGB(i, r(i), g(i), b(i));
        end loop;

        -- Now set cmap0 all at once (faster, since fewer driver calls).
        Set_Color_Map_0(r, g, b);

        draw_windows(100, 16);

        Eject_Current_Page;
    end demo2;

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

    -- Initialize plplot.
    Initialize_PLplot;

    -- Run demos.
    demo1;
    demo2;

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

end xstandard02a;