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-- Log plot demo.
-- Copyright (C) 2007 - 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
System,
Ada.Strings.Unbounded,
Ada.Numerics,
Ada.Numerics.Long_Elementary_Functions,
PLplot_Auxiliary,
PLplot_Standard;
use
System,
Ada.Strings.Unbounded,
Ada.Numerics,
Ada.Numerics.Long_Elementary_Functions,
PLplot_Auxiliary,
PLplot_Standard;
procedure xstandard04a is
procedure plot1(Plot_Type : Integer) is
freql, ampl, phase : Real_Vector(0 .. 100);
f0, freq : Long_Float;
begin
Advance_To_Subpage(Next_Subpage);
f0 := 1.0;
for i in freql'range loop
freql(i) := -2.0 + Long_Float(i) / 20.0;
freq := 10.0 ** freql(i);
ampl(i) := 20.0 * log(1.0 / sqrt(1.0 + (freq / f0) ** 2.0), 10.0);
phase(i) := -(180.0 / pi) * arctan(freq / f0);
end loop;
Set_Viewport_Normalized(0.15, 0.85, 0.1, 0.9);
Set_Viewport_World(-2.0, 3.0, -80.0, 0.0);
-- Try different axis and labelling styles.
Set_Pen_Color(Red);
if Plot_Type = 0 then
Box_Around_Viewport("bclnst", 0.0, 0, "bnstv", 0.0, 0);
elsif Plot_Type = 1 then
Box_Around_Viewport("bcfghlnst", 0.0, 0, "bcghnstv", 0.0, 0);
end if;
-- Plot ampl vs freq
Set_Pen_Color(Yellow);
Draw_Curve(freql, ampl);
Set_Pen_Color(Yellow);
Write_Text_World(1.6, -30.0, 1.0, -20.0, 0.5, "-20 dB/decade");
-- Put labels on
Set_Pen_Color(Red);
Write_Text_Viewport("b", 3.2, 0.5, 0.5, "Frequency");
Write_Text_Viewport("t", 2.0, 0.5, 0.5, "Single Pole Low-Pass Filter");
Set_Pen_Color(Yellow);
Write_Text_Viewport("l", 5.0, 0.5, 0.5, "Amplitude (dB)");
-- For the gridless case, put phase vs freq on same plot
if Plot_Type = 0 then
Set_Pen_Color(Red);
Set_Viewport_World(-2.0, 3.0, -100.0, 0.0);
Box_Around_Viewport("", 0.0, 0, "cmstv", 30.0, 3);
Set_Pen_Color(Green);
Draw_Curve(freql, phase);
Draw_String(freql, phase, "#(728)");
Set_Pen_Color(Green);
Write_Text_Viewport("r", 5.0, 0.5, 0.5, "Phase shift (degrees)");
end if;
Set_One_Color_Map_0_And_Alpha(White, 32, 32, 32, 0.70);
-- Draw the legends.
if Plot_Type = 0 then -- Make a legend with two entries.
declare
text, symbols : Legend_String_Array_Type(0 .. 1);
opt_array : Integer_Array_1D(0 .. 1);
text_colors, line_colors, line_styles : Integer_Array_1D(0..1);
symbol_numbers, symbol_colors : Integer_Array_1D(0 .. 1);
line_widths, symbol_scales : Real_Vector(0 .. 1);
legend_width, legend_height : Long_Float;
-- Dummy arrays for unused entities. C uses null arguments but we can't.
Box_Colors, Box_Patterns : Integer_Array_1D(0 .. 1):= (others => 0);
Box_Scales, Box_Line_Widths : Real_Vector(0 .. 1):= (others => 1.0);
begin
-- First legend entry.
opt_array(0) := Legend_Line;
text_colors(0) := Yellow;
text(0) := To_Unbounded_String("Amplitude");
line_colors(0) := Yellow; -- fixme Use declared constants, not integers.
line_styles(0) := 1;
line_widths(0) := 1.0;
symbol_colors(0) := 3; -- Don't care; not used.
symbol_scales(0) := 1.0; -- Don't care; not used.
symbol_numbers(0) := 4; -- Don't care; not used.
symbols(0) := To_Unbounded_String("#(728)"); -- Don't care; not used.
-- Second legend entry.
opt_array(1) := Legend_Line + Legend_Symbol;
text_colors(1) := Green;
text(1) := To_Unbounded_String("Phase shift");
line_colors(1) := Green;
line_styles(1) := 1;
line_widths(1) := 1.0;
symbol_colors(1) := Green;
symbol_scales(1) := 1.0;
symbol_numbers(1) := 4;
symbols(1) := To_Unbounded_String("#(728)");
Create_Legend(legend_width, legend_height,
Legend_Background + Legend_Bounding_Box, 0,
0.0, 0.0, 0.1, White,
Red, 1, 0, 0,
opt_array,
1.0, 1.0, 2.0,
1.0, text_colors, text,
Box_Colors, Box_Patterns,
Box_Scales, Box_Line_Widths,
line_colors, line_styles, line_widths,
symbol_colors, symbol_scales, symbol_numbers, symbols);
end; -- declare block
elsif Plot_Type = 1 then -- Make a legend with one entry.
declare
text, symbols : Legend_String_Array_Type(0 .. 0);
opt_array : Integer_Array_1D(0 .. 0);
text_colors, line_colors, line_styles : Integer_Array_1D(0..0);
symbol_numbers, symbol_colors : Integer_Array_1D(0 .. 0);
line_widths, symbol_scales : Real_Vector(0 .. 0);
legend_width, legend_height : Long_Float;
-- Dummy arrays for unused entities. C uses null arguments but we can't.
Box_Colors, Box_Patterns : Integer_Array_1D(0 .. 0);
Box_Scales, Box_Line_Widths : Real_Vector(0 .. 0);
begin
-- First legend entry.
opt_array(0) := Legend_Line;
text_colors(0) := Yellow;
text(0) := To_Unbounded_String("Amplitude");
line_colors(0) := Yellow; -- fixme Use declared constants, not integers.
line_styles(0) := 1;
line_widths(0) := 1.0;
symbol_colors(0) := 3; -- Don't care; not used.
symbol_scales(0) := 1.0; -- Don't care; not used.
symbol_numbers(0) := 4; -- Don't care; not used.
symbols(0) := To_Unbounded_String("#(728)"); -- Don't care; not used.
Box_Colors(0) := 0;
Box_Patterns(0) := 0;
Box_Line_Widths(0) := 0.0;
Box_Scales(0) := 0.0;
Create_Legend(legend_width, legend_height,
Legend_Background + Legend_Bounding_Box, 0,
0.0, 0.0, 0.1, White,
Red, 1, 0, 0,
opt_array,
1.0, 1.0, 2.0,
1.0, text_colors, text,
Box_Colors, Box_Patterns,
Box_Scales, Box_Line_Widths,
line_colors, line_styles, line_widths,
symbol_colors, symbol_scales, symbol_numbers, symbols);
end; -- declare block
end if;
end plot1;
begin
-- Parse and process command line arguments
Parse_Command_Line_Arguments(Parse_Full);
-- Initialize plplot
Initialize_PLplot;
Set_Font_Style(Roman_Font);
-- Make log plots using two different styles.
plot1(0);
plot1(1);
End_PLplot;
end xstandard04a;
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