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gnuplot demo script: rgb_variable.dem

autogenerated by webify.pl on Wed Jul 15 17:34:15 2015
gnuplot version gnuplot 5.0 patchlevel 1
#
# Demo of reading color information from the data file itself
#

#
rgb(r,g,b) = int(r)*65536 + int(g)*256 + int(b)

#
set border 0
unset xtics; unset ytics; unset ztics
set rmargin 5; set lmargin 5; set bmargin 2

set angle degrees
xrgb(r,g,b) = (g-b)/255. * cos(30.)  
yrgb(r,g,b) = r/255. - (g+b)/255. * sin(30.)
set arrow 1 from 0,0 to 0,1 nohead lw 3 lc rgb "red" back
set arrow 2 from 0,0 to cos(-30), sin(-30) nohead lw 3 lc rgb "green" back
set arrow 3 from 0,0 to cos(210), sin(210) nohead lw 3 lc rgb "blue" back

set title "RGB color information read from data file"
plot 'rgb_variable.dat' using (xrgb($1,$2,$3)):(yrgb($1,$2,$3)):(rgb($1,$2,$3)) \
     with points pt 7 ps 4 lc rgb variable notitle

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#
set title "Both RGB color information\n and point size controlled by input"
plot 'rgb_variable.dat' using (xrgb($1,$2,$3)):(yrgb($1,$2,$3)):(1.+2.*rand(0)):(rgb($1,$2,$3)) \
     with points pt 7 ps var lc rgb variable notitle

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#
set border -1 front linetype -1 linewidth 1.000
set ticslevel 0
set xtics border
set ytics border
set ztics border
#
unset arrow 1
unset arrow 2
unset arrow 3
#
set xlabel "Red" tc rgb "red"
set xrange [0:255]
set ylabel "Green" tc rgb "green"
set yrange [0:255]
set zlabel "Blue" tc rgb "blue"
set zrange [0:255]

#
splot 'rgb_variable.dat' using 1:2:3:(rgb($1,$2,$3)) with points pt 7 ps 4 lc rgb variable, \
      '' using 1:2:3:(sprintf("0x%x",rgb($1,$2,$3))) with labels left offset 1 notitle

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#
#
# Unfortunately, not all platforms allow us to read hexadecimal constants
# from a data file. Warn the user if that is the case.
#
if (0 == int('0x01')) \
   set label 99 at screen .05, screen .15 "If you see only black dots,\nthis means your platform does not \nsupport reading hexadecimal constants\nfrom a data file. Get a newer libc."

splot 'rgb_variable.dat' using 1:2:3:(5*rand(0)):4 with points pt 7 ps variable lc rgb variable \
      title "variable pointsize and rgb color read as hexidecimal"


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set label 99 ""
#
set border 0
set xtics axis nomirror
set ytics axis nomirror
set ztics axis nomirror
set xzeroaxis lt -1 lc rgb "red" lw 2
set yzeroaxis lt -1 lc rgb "green" lw 2
set zzeroaxis lt -1 lc rgb "blue" lw 2
set xyplane at 0.0

splot 'rgb_variable.dat' using 1:2:3:(5*rand(0)):(rgb($1,$2,$3)) with points pt 7 ps variable lc rgb variable \
      title "variable pointsize and rgb color computed from coords"

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set title "Demo of hidden3d with points only (no surface)"
set hidden3d
replot

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#

RGB(R,G,B) =  int(255.*R) * 2**16 + int(255.*G) * 2**8  + int(255.*B)

set xr [0.01:1]
set yr [0.01:1]
set zr [0:1]
set xtics ("R=1" 1)
set ytics ("G=1" 1)
set ztics ("0" 0, "B=1" 1)
unset colorbox
set isosamples 40,40
set xyplane at 0.0
set view 63,58,1.,1.4

set title "RGB coloring of pm3d surface"
unset key

# Just some function that is well-defined in this range
# (except at the origin)
f(x,y) = 0.4 + sin(sqrt(100.*x**2+100.*y**2)) \
       / (1.5*sqrt(100.*x**2+100.*y**2))

splot '++' using 1:2:(f($1,$2)):(RGB($1,$2,f($1,$2))) \
       with pm3d lc rgb variable


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set title "HSV coloring of pm3d surface\n(V=1)"
unset xtics
unset ytics
set ztics ("0" 0)
set xlabel "H"
set ylabel "S"

splot '++' using 1:2:(f($1,$2)):(hsv2rgb($1,$2,1.0)) \
       with pm3d lc rgb variable


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