Root/nanonote-files/example-files/data/Examples/lua-plplot-examples/x02.lua

1--[[ $Id: x02.lua 9414 2009-01-29 22:48:54Z airwin $
2
3    Multiple window and color map 0 demo.
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.
25dofile("plplot_examples.lua")
26
27----------------------------------------------------------------------------
28-- draw_windows
29--
30-- Draws a set of numbered boxes with colors according to cmap0 entry.
31----------------------------------------------------------------------------
32
33function draw_windows(nw, cmap0_offset)
34  pl.schr(0, 3.5)
35  pl.font(4)
36
37  for i = 0, nw-1 do
38    pl.col0(i+cmap0_offset)
39    pl.adv(0)
40    vmin = 0.1
41    vmax = 0.9
42    for j = 0, 2 do
43      pl.wid(j + 1)
44      pl.vpor(vmin, vmax, vmin, vmax)
45      pl.wind(0, 1, 0, 1)
46      pl.box("bc", 0, 0, "bc", 0, 0)
47      vmin = vmin + 0.1
48      vmax = vmax - 0.1
49    end
50    pl.wid(1)
51    pl.ptex(0.5, 0.5, 1, 0, 0.5, tostring(i))
52  end
53end
54
55
56----------------------------------------------------------------------------
57-- demo1
58--
59-- Demonstrates multipl.e windows and default color map 0 palette.
60----------------------------------------------------------------------------
61
62function demo1()
63  pl.bop()
64
65  -- Divide screen into 16 regions
66  pl.ssub(4, 4)
67
68  draw_windows(16, 0)
69
70  pl.eop()
71end
72
73
74----------------------------------------------------------------------------
75-- demo2
76--
77-- Demonstrates multipl.e windows, user-modified color map 0 palette, and
78-- HLS -> RGB translation.
79----------------------------------------------------------------------------
80
81function demo2()
82  -- Set up cmap0
83  -- Use 100 custom colors in addition to base 16
84  r = {}
85  g = {}
86  b = {}
87
88  -- Min & max lightness values
89  lmin = 0.15
90  lmax = 0.85
91
92  pl.bop()
93
94  -- Divide screen into 100 regions
95
96  pl.ssub(10, 10)
97
98  for i = 0, 99 do
99    -- Bounds on HLS, from pl.hlsrgb() commentary --
100    -- hue [0., 360.] degrees
101    -- lightness [0., 1.] magnitude
102    -- saturation [0., 1.] magnitude
103   
104    -- Vary hue uniformly from left to right
105    h = (360/10) * math.mod(i, 10)
106    
107    -- Vary lightness uniformly from top to bottom, between min & max
108    l = lmin + (lmax - lmin) * math.floor(i/10)/9
109    
110    -- Use max saturation
111    s = 1
112
113    r1, g1, b1 = pl.hlsrgb(h, l, s)
114
115    -- Use 255.001 to avoid close truncation decisions in this example.
116    r[i+1+16] = r1 * 255.001
117    g[i+1+16] = g1 * 255.001
118    b[i+1+16] = b1 * 255.001
119  end
120
121  -- Load default cmap0 colors into our custom set
122  for i = 0, 15 do
123    r[i+1], g[i+1], b[i+1] = pl.gcol0(i)
124  end
125
126  -- Now set cmap0 all at once (faster, since fewer driver calls)
127  pl.scmap0(r, g, b)
128
129  draw_windows(100, 16)
130
131  pl.eop()
132end
133
134
135----------------------------------------------------------------------------
136-- main
137--
138-- Demonstrates multipl.e windows and color map 0 palette, both default and
139-- user-modified.
140----------------------------------------------------------------------------
141
142-- Parse and process command line arguments
143pl.parseopts(arg, pl.PL_PARSE_FULL)
144
145-- Initialize pl.pl.ot
146pl.init()
147
148-- Run demos
149demo1()
150demo2()
151
152pl.plend()
153

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