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97 lines
2.7 KiB
Lua
97 lines
2.7 KiB
Lua
--[[ $Id: x25.lua 10668 2009-12-02 08:38:49Z airwin $
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Filling and clipping polygons.
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Copyright (C) 2008 Werner Smekal
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This file is part of PLplot.
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PLplot is free software you can redistribute it and/or modify
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it under the terms of the GNU General Library Public License as published
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by the Free Software Foundation either version 2 of the License, or
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(at your option) any later version.
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PLplot is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Library General Public License for more details.
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You should have received a copy of the GNU Library General Public License
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along with PLplot if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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--]]
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-- initialise Lua bindings for PLplot examples.
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dofile("plplot_examples.lua")
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--------------------------------------------------------------------------
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-- main
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--
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-- Test program for filling polygons and proper clipping
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--------------------------------------------------------------------------
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xextreme = {}
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yextreme ={}
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x0 = {}
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y0 = {}
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-- Parse and process command line arguments
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pl.parseopts(arg, pl.PL_PARSE_FULL)
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-- Initialize plplot
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pl.ssub(3, 3)
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pl.init()
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xextreme = { { -120, 120 }, { -120, 120 }, { -120, 120 }, { -80, 80 }, { -220, -120 },
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{ -20, 20 }, { -20, 20 }, { -80, 80 }, { 20, 120 } }
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yextreme = { { -120, 120 }, { 20, 120 }, { -20, 120 }, { -20, 120 }, { -120, 120 },
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{ -120, 120 }, { -20, 20 }, { -80, 80 }, { -120, 120 } }
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for k = 1, 2 do
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for j = 1, 4 do
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if j==1 then
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-- Polygon 1: a diamond
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x0 = { 0, -100, 0, 100 }
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y0 = { -100, 0, 100, 0}
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end
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if j==2 then
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-- Polygon 1: a diamond - reverse direction
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x0 = { 100, 0, -100, 0 }
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y0 = { 0, 100, 0, -100}
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end
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if j==3 then
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-- Polygon 2: a square with punctures
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x0 = { -100, -100, 80, -100, -100, -80, 0, 80, 100, 100 }
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y0 = { -100, -80, 0, 80, 100, 100, 80, 100, 100, -100}
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end
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if j==4 then
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-- Polygon 2: a square with punctures - reversed direction
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x0 = { 100, 100, 80, 0, -80, -100, -100, 80, -100, -100 }
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y0 = { -100, 100, 100, 80, 100, 100, 80, 0, -80, -100}
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end
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for i = 1, 9 do
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pl.adv(0)
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pl.vsta()
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pl.wind(xextreme[i][1], xextreme[i][2], yextreme[i][1], yextreme[i][2])
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pl.col0(2)
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pl.box("bc", 1, 0, "bcnv", 10, 0)
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pl.col0(1)
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pl.psty(0)
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if k==1 then
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pl.fill(x0, y0)
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else
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pl.gradient(x0, y0, 45.)
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end
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pl.col0(2)
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pl.lsty(1)
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pl.line(x0, y0)
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end
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end
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end
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-- Don't forget to call plend() to finish off!
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pl.plend()
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