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| 1 | --[[ $Id: x25.lua 10668 2009-12-02 08:38:49Z airwin $ |
| 2 | |
| 3 | Filling and clipping polygons. |
| 4 | |
| 5 | Copyright (C) 2008 Werner Smekal |
| 6 | |
| 7 | This file is part of PLplot. |
| 8 | |
| 9 | PLplot is free software you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Library Public License as published |
| 11 | by the Free Software Foundation either version 2 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | PLplot is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU Library General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU Library General Public License |
| 20 | along with PLplot if not, write to the Free Software |
| 21 | Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 22 | --]] |
| 23 | |
| 24 | -- initialise Lua bindings for PLplot examples. |
| 25 | dofile("plplot_examples.lua") |
| 26 | |
| 27 | -------------------------------------------------------------------------- |
| 28 | -- main |
| 29 | -- |
| 30 | -- Test program for filling polygons and proper clipping |
| 31 | -------------------------------------------------------------------------- |
| 32 | |
| 33 | xextreme = {} |
| 34 | yextreme ={} |
| 35 | x0 = {} |
| 36 | y0 = {} |
| 37 | |
| 38 | -- Parse and process command line arguments |
| 39 | pl.parseopts(arg, pl.PL_PARSE_FULL) |
| 40 | |
| 41 | -- Initialize plplot |
| 42 | pl.ssub(3, 3) |
| 43 | pl.init() |
| 44 | |
| 45 | xextreme = { { -120, 120 }, { -120, 120 }, { -120, 120 }, { -80, 80 }, { -220, -120 }, |
| 46 | { -20, 20 }, { -20, 20 }, { -80, 80 }, { 20, 120 } } |
| 47 | |
| 48 | yextreme = { { -120, 120 }, { 20, 120 }, { -20, 120 }, { -20, 120 }, { -120, 120 }, |
| 49 | { -120, 120 }, { -20, 20 }, { -80, 80 }, { -120, 120 } } |
| 50 | |
| 51 | for k = 1, 2 do |
| 52 | for j = 1, 4 do |
| 53 | if j==1 then |
| 54 | -- Polygon 1: a diamond |
| 55 | x0 = { 0, -100, 0, 100 } |
| 56 | y0 = { -100, 0, 100, 0} |
| 57 | end |
| 58 | if j==2 then |
| 59 | -- Polygon 1: a diamond - reverse direction |
| 60 | x0 = { 100, 0, -100, 0 } |
| 61 | y0 = { 0, 100, 0, -100} |
| 62 | end |
| 63 | if j==3 then |
| 64 | -- Polygon 2: a square with punctures |
| 65 | x0 = { -100, -100, 80, -100, -100, -80, 0, 80, 100, 100 } |
| 66 | y0 = { -100, -80, 0, 80, 100, 100, 80, 100, 100, -100} |
| 67 | end |
| 68 | if j==4 then |
| 69 | -- Polygon 2: a square with punctures - reversed direction |
| 70 | x0 = { 100, 100, 80, 0, -80, -100, -100, 80, -100, -100 } |
| 71 | y0 = { -100, 100, 100, 80, 100, 100, 80, 0, -80, -100} |
| 72 | end |
| 73 | |
| 74 | for i = 1, 9 do |
| 75 | pl.adv(0) |
| 76 | pl.vsta() |
| 77 | pl.wind(xextreme[i][1], xextreme[i][2], yextreme[i][1], yextreme[i][2]) |
| 78 | |
| 79 | pl.col0(2) |
| 80 | pl.box("bc", 1, 0, "bcnv", 10, 0) |
| 81 | pl.col0(1) |
| 82 | pl.psty(0) |
| 83 | if k==1 then |
| 84 | pl.fill(x0, y0) |
| 85 | else |
| 86 | pl.gradient(x0, y0, 45.) |
| 87 | end |
| 88 | pl.col0(2) |
| 89 | pl.lsty(1) |
| 90 | pl.line(x0, y0) |
| 91 | end |
| 92 | end |
| 93 | end |
| 94 | |
| 95 | -- Don't forget to call plend() to finish off! |
| 96 | pl.plend() |
| 97 |
