gnuplot demo script: rgb_variable.dem

set border -1 front linetype -1 linewidth 1.000
set ticslevel 0
set xtics border
set ytics border
set ztics border
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]
#
rgb(r,g,b) = int(r)*65536 + int(g)*256 + int(b)
#
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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#
reset