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-- Filling and clipping polygons.
-- Copyright (C) 2008, 2010 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
PLplot_Auxiliary,
PLplot_Traditional;
use
PLplot_Auxiliary,
PLplot_Traditional;
-- Test program for filling polygons and proper clipping
procedure xtraditional25a is
npts : Integer := 0;
xextreme, yextreme : Real_Matrix(0 .. 8, 0 .. 1);
x0, y0 : Real_Vector(0 .. 9);
begin
-- Parse and process command line arguments
plparseopts(PL_PARSE_FULL);
-- Initialize plplot
plssub(3,3);
plinit;
xextreme(0, 0) := -120.0; xextreme(0, 1) := 120.0; yextreme(0, 0) := -120.0; yextreme(0, 1) := 120.0;
xextreme(1, 0) := -120.0; xextreme(1, 1) := 120.0; yextreme(1, 0) := 20.0; yextreme(1, 1) := 120.0;
xextreme(2, 0) := -120.0; xextreme(2, 1) := 120.0; yextreme(2, 0) := -20.0; yextreme(2, 1) := 120.0;
xextreme(3, 0) := -80.0; xextreme(3, 1) := 80.0; yextreme(3, 0) := -20.0; yextreme(3, 1) := 120.0;
xextreme(4, 0) := -220.0; xextreme(4, 1) := -120.0; yextreme(4, 0) := -120.0; yextreme(4, 1) := 120.0;
xextreme(5, 0) := -20.0; xextreme(5, 1) := 20.0; yextreme(5, 0) := -120.0; yextreme(5, 1) := 120.0;
xextreme(6, 0) := -20.0; xextreme(6, 1) := 20.0; yextreme(6, 0) := -20.0; yextreme(6, 1) := 20.0;
xextreme(7, 0) := -80.0; xextreme(7, 1) := 80.0; yextreme(7, 0) := -80.0; yextreme(7, 1) := 80.0;
xextreme(8, 0) := 20.0; xextreme(8, 1) := 120.0; yextreme(8, 0) := -120.0; yextreme(8, 1) := 120.0;
for k in 0 .. 1 loop
for j in 0 .. 3 loop
if j = 0 then
-- Polygon 1: a diamond
x0(0) := 0.0; y0(0) := -100.0;
x0(1) := -100.0; y0(1) := 0.0;
x0(2) := 0.0; y0(2) := 100.0;
x0(3) := 100.0; y0(3) := 0.0;
npts := 4;
end if;
if j = 1 then
-- Polygon 1: a diamond - reverse direction
x0(3) := 0.0; y0(3) := -100.0;
x0(2) := -100.0; y0(2) := 0.0;
x0(1) := 0.0; y0(1) := 100.0;
x0(0) := 100.0; y0(0) := 0.0;
npts := 4;
end if;
if j = 2 then
-- Polygon 2: a square with punctures
x0(0) := -100.0; y0(0) := -100.0;
x0(1) := -100.0; y0(1) := -80.0;
x0(2) := 80.0; y0(2) := 0.0;
x0(3) := -100.0; y0(3) := 80.0;
x0(4) := -100.0; y0(4) := 100.0;
x0(5) := -80.0; y0(5) := 100.0;
x0(6) := 0.0; y0(6) := 80.0;
x0(7) := 80.0; y0(7) := 100.0;
x0(8) := 100.0; y0(8) := 100.0;
x0(9) := 100.0; y0(9) := -100.0;
npts := 10;
end if;
if j = 3 then
-- Polygon 2: a square with punctures - reversed direction
x0(9) := -100.0; y0(9) := -100.0;
x0(8) := -100.0; y0(8) := -80.0;
x0(7) := 80.0; y0(7) := 0.0;
x0(6) := -100.0; y0(6) := 80.0;
x0(5) := -100.0; y0(5) := 100.0;
x0(4) := -80.0; y0(4) := 100.0;
x0(3) := 0.0; y0(3) := 80.0;
x0(2) := 80.0; y0(2) := 100.0;
x0(1) := 100.0; y0(1) := 100.0;
x0(0) := 100.0; y0(0) := -100.0;
npts := 10;
end if;
for i in xextreme'range(1) loop
pladv(0);
plvsta;
plwind(xextreme(i, 0), xextreme(i, 1), yextreme(i, 0), yextreme(i, 1));
declare
x0_Stop_Sucking, y0_Stop_Sucking : Real_Vector(0 .. npts - 1);
begin
x0_Stop_Sucking := x0(0 .. npts - 1);
y0_Stop_Sucking := y0(0 .. npts - 1);
plcol0(2);
plbox("bc", 1.0, 0, "bcnv", 10.0, 0);
plcol0(1);
plpsty(0);
-- Solid fill or gradient fill
if k = 0 then
plfill(x0_Stop_Sucking, y0_Stop_Sucking);
else
plgradient(x0_Stop_Sucking, y0_Stop_Sucking, 45.0);
end if;
plcol0(2);
pllsty(1);
plline(x0_Stop_Sucking, y0_Stop_Sucking);
end;
end loop; -- i
end loop; -- j
end loop; --k
-- Don't forget to call plend to finish off!
plend;
end xtraditional25a;
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