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-- $Id: xthick30a.adb.cmake 9378 2009-01-23 09:13:27Z jbauck $
-- Alpha color values demonstration
-- 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 General Library 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.Numerics,
Ada.Numerics.Long_Elementary_Functions,
PLplot_Auxiliary,
PLplot;
use
System,
Ada.Numerics,
Ada.Numerics.Long_Elementary_Functions,
PLplot_Auxiliary,
PLplot;
@Ada_Is_2007_With_and_Use_Numerics@
procedure xthick30a is
red : Integer_Array_1D(0 .. 3) := ( 0, 255, 0, 0);
green : Integer_Array_1D(0 .. 3) := ( 0, 0, 255, 0);
blue : Integer_Array_1D(0 .. 3) := ( 0, 0, 0, 255);
alpha : Real_Vector(0 .. 3) := (1.0, 1.0, 1.0, 1.0);
px : Real_Vector(0 .. 3) := (0.1, 0.5, 0.5, 0.1);
py : Real_Vector(0 .. 3) := (0.1, 0.1, 0.5, 0.5);
pos : Real_Vector(0 .. 1) := (0.0, 1.0);
rcoord : Real_Vector(0 .. 1) := (1.0, 1.0);
gcoord : Real_Vector(0 .. 1) := (0.0, 0.0);
bcoord : Real_Vector(0 .. 1) := (0.0, 0.0);
acoord : Real_Vector(0 .. 1) := (0.0, 1.0);
icol, r, g, b : Integer;
a : Long_Float;
clevel : Real_Vector(0 .. 100);
z : Real_Matrix(0 .. 1, 0 .. 1);
begin
Parse_Command_Line_Arguments(Parse_Full);
Initialize_PLplot;
Set_Number_Of_Colors_Map_0(4);
Set_Color_Map_0_And_Alpha(red, green, blue, alpha);
-- Page 1:
-- This is a series of red, green and blue rectangles overlaid
-- on each other with gradually increasing transparency.
-- Set up the window
Advance_To_Subpage(Next_Subpage);
Set_Viewport_Normalized(0.0, 1.0, 0.0, 1.0);
Set_Viewport_World(0.0, 1.0, 0.0, 1.0);
Set_Pen_Color(Black);
Box_Around_Viewport("", 1.0, 0, "", 1.0, 0);
-- Draw the boxes
for i in 0 .. 8 loop
icol := i mod 3 + 1;
-- Get a color, change its transparency and set it as the current color.
Get_Color_RGB_And_Alpha(icol, r, g, b, a);
Set_One_Color_Map_0_And_Alpha(icol, r, g, b, 1.0 - Long_Float(i) / 9.0);
Set_Pen_Color(icol);
-- Draw the rectangle
Fill_Polygon(px, py);
-- Shift the rectangles coordinates
for j in px'range loop
px(j) := px(j) + 0.5 / 9.0;
py(j) := py(j) + 0.5 / 9.0;
end loop;
end loop;
-- Page 2:
-- This is a bunch of boxes colored red, green or blue with a single
-- large (red) box of linearly varying transparency overlaid. The
-- overlaid box is completely transparent at the bottom and completely
-- opaque at the top.
-- Set up the window
Advance_To_Subpage(Next_Subpage);
Set_Viewport_Normalized(0.1, 0.9, 0.1, 0.9);
Set_Viewport_World(0.0, 1.0, 0.0, 1.0);
-- Draw the boxes. There are 25 of them drawn on a 5 x 5 grid.
for i in 0 .. 4 loop
-- Set box X position.
px(0) := 0.05 + 0.2 * Long_Float(i);
px(1) := px(0) + 0.1;
px(2) := px(1);
px(3) := px(0);
-- We don't want the boxes to be transparent, so since we changed
-- the colors transparencies in the first example we have to change
-- the transparencies back to completely opaque.
icol := i mod 3 + 1;
Get_Color_RGB_And_Alpha(icol, r, g, b, a);
Set_One_Color_Map_0_And_Alpha(icol, r, g, b, 1.0);
Set_Pen_Color(icol);
for j in 0 ..4 loop
-- Set box y position and draw the box.
py(0) := 0.05 + 0.2 * Long_Float(j);
py(1) := py(0);
py(2) := py(0) + 0.1;
py(3) := py(2);
Fill_Polygon(px, py);
end loop;
end loop;
-- The overlaid box is drawn using Shade_Regions with a color map that is
-- the same color but has a linearly varying transparency.
-- Create the color map with 128 colors and use Set_Color_Map_1_RGBla to initialize
-- the color values with a linear varying transparency (or alpha).
Set_Number_Of_Colors_In_Color_Map_1(128);
Set_Color_Map_1_Piecewise_And_Alpha(RGB, pos, rcoord, gcoord, bcoord, acoord, Reverse_Hue_None);
-- Create a 2 x 2 array that contains the z values (0.0 to 1.0) that will
-- used for the shade plot. Shade_Regions will use linear interpolation to
-- calculate the z values of all the intermediate points in this array.
z(0, 0) := 0.0;
z(1, 0) := 0.0;
z(0, 1) := 1.0;
z(1, 1) := 1.0;
-- Set the color levels array. These levels are also between 0.0 and 1.0
for i in clevel'range loop
clevel(i) := 0.01 * Long_Float(i);
end loop;
-- Draw the shade plot with zmin := 0.0, zmax := 1.0 and x and y coordinate
-- ranges such that it fills the entire plotting area.
Shade_Regions(z, Null, 0.0, 1.0, 0.0, 1.0, clevel, 0, 0, 2, Fill_Polygon'access, True, NULL, System.Null_Address);
End_PLplot;
end xthick30a;
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