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97 lines
2.4 KiB
Lua
97 lines
2.4 KiB
Lua
--[[ $Id: x13.lua 9526 2009-02-13 22:06:13Z smekal $
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Pie chart demo.
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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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text = { "Maurice", "Geoffrey", "Alan",
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"Rafael", "Vince" }
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--------------------------------------------------------------------------
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-- main
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--
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-- Does a simple pie chart.
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--------------------------------------------------------------------------
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per = { 10, 32, 12, 30, 16 }
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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.init()
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pl.adv(0)
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-- Ensure window has aspect ratio of one so circle is
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-- plotted as a circle.
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pl.vasp(1)
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pl.wind(0, 10, 0, 10)
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pl.col0(2)
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-- n.b. all theta quantities scaled by 2*M_PI/500 to be integers to avoid
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--floating point logic problems.
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theta0 = 0
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dthet = 1
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for i = 1, 5 do
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x = { 5 }
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y = { 5 }
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j = 2
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-- n.b. the theta quantities multiplied by 2*math.pi/500 afterward so
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-- in fact per is interpreted as a percentage.
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theta1 = theta0 + 5 * per[i]
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if i == 5 then theta1 = 500 end
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for theta = theta0, theta1, dthet do
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x[j] = 5 + 3 * math.cos(2*math.pi/500*theta)
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y[j] = 5 + 3 * math.sin(2*math.pi/500*theta)
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j = j + 1
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thetasave=theta
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end
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pl.col0(i)
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pl.psty(math.mod((i + 2), 8) + 1)
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pl.fill(x, y)
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pl.col0(1)
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pl.line(x, y)
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just = 2*math.pi/500*(theta0 + theta1)/2
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dx = 0.25 * math.cos(just)
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dy = 0.25 * math.sin(just)
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if (theta0 + theta1)<250 or (theta0 + theta1)>750 then
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just = 0
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else
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just = 1
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end
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pl.ptex((x[(j-1)/2+1] + dx), (y[(j-1)/2+1] + dy), 1, 0, just, text[i]);
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theta0 = thetasave
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end
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pl.font(2)
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pl.schr(0, 1.3)
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pl.ptex(5, 9, 1, 0, 0.5, "Percentage of Sales")
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pl.plend()
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