#

# 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

pause -1 "Hit return to continue"

#

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

pause -1 "Hit return to continue"

#

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

pause -1 "Hit return to continue"

#

#

# 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"

pause -1 "Hit return to continue"

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"

pause -1 "Hit return to continue"

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

set hidden3d

replot

pause -1 "Hit return to continue"

reset

#

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 ur [0.01:1]

set vr [0.01:1]

set zr [0:1.065]

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

pause -1 "Hit return to continue"

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

pause -1 "Hit return to continue"

set title "Explicit borders for pm3d tiling"

set pm3d border lt black hidden3d

set sample 10

set isosample 10

replot

pause -1 "Hit return to continue"

reset