set title "pm3d at s (surface) / ticslevel 0"
set ticslevel 0
set pm3d at s
set cblabel "colour gradient"
replot

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set title "pm3d at b (bottom)"
set pm3d at b
replot

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set title "unset surface; set pm3d at st (surface and top)"
unset surface
set pm3d at st
replot

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unset cblabel

set title "set pm3d at bstbst (funny combination, only for screen or postscript)"
set view 50,50
set pm3d at bstbst
replot

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set title "gray map"
set view map
set pm3d at b
set palette gray
set samples 100; set isosamples 100
replot

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set title "gray map, negative"
set palette gray negative
replot

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set title "colour map, using default rgbformulae 7,5,15 ... traditional pm3d (black-blue-red-yellow)"
set palette color positive
set samples 50; set isosamples 50
replot

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set title "colour, rgbformulae 3,11,6 ... green-red-violet"
set palette rgbformulae 3,11,6
replot

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set title "colour, rgbformulae 23,28,3  ... ocean (green-blue-white); OK are also all other permutations"
set palette rgbformulae 23,28,3
replot

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set title "colour, rgbformulae 30,31,32 ... color printable on gray (black-blue-violet-yellow-white)"
set palette rgbformulae 30,31,32
replot

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set title "cubehelix color scheme with monotonic intensity\nD A Green (2011) http://arxiv.org/abs/1108.5083" offset 0,1
set palette cubehelix
replot

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test palette

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set title "rgbformulae 31,-11,32: negative formula number=inverted color"
set palette rgbformulae 31,-11,32
replot

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set yrange [*:*] noreverse


reset

set title "set pm3d scansforward: wrong, because back overwrites front"
set pm3d
set palette
set view 130,10
set samples 50; set isosamples 50
set border 4095
unset surface
set pm3d at s scansforward
splot sin(sqrt(x**2+y**2))/sqrt(x**2+y**2)

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set title "set pm3d scansbackward: correctly looking surface"
set xlabel
set border 4095
set pm3d scansbackward
replot

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set title "set hidden3d"
set samples 30; set isosamples 30
set hidden3d
set pm3d
set surface
set view 50,220
set xrange [-2:2]
set yrange [-2:2]
splot log(x*x*y*y)

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unset hidden3d

# draw the surface using pm3d's depth sorting with line type 100
unset hidden
unset surface

set title "set pm3d depthorder border lc 'black' lw 1"
set samples 30; set isosamples 30
set pm3d
set style line 100 lt 5 lw 0.5
set pm3d depthorder border lc 'black' lw 1
set view 50,220
set xrange [-2:2]
set yrange [-2:2]
splot log(x*x*y*y)

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set pm3d

set title "bad: surface and top are too close together"
set xrange [-1:1]
set yrange [-1:1]
unset hidd
set zrange [-15:4]
set ticslevel 0
set pm3d at st
splot log(x*x*y*y)

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set title "solution: use independent 'set zrange' and 'set cbrange'"
unset surf
set cbrange [-15:4]
set zrange [-15:60]
splot log(x*x*y*y)

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set autoscale cb

set title "color box is on by default at a certain position"
set samples 20; set isosamples 20
set autoscale
set key on
set pm3d
set pm3d at s
set view 60,30
splot y

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set title "color box is on again, now with horizontal gradient"
set size 0.6,0.6; set origin 0.2,0.25
set colorbox horizontal
set colorbox user origin 0.1,0.15 size 0.8,0.1
set mcbtics 2
set grid cb
set cblabel "see cblabel, grid cb, mcbtics, ..."
replot 

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unset cblabel; unset mcbtics; set grid nocb; set colorbox default

set title "color box is switched off"
unset colorbox
replot 

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set title 'using now "set grid back; unset colorbox"'
unset colorbox
set pm3d
set border 895
set grid back
replot 

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set size 1,1; set origin 0,0
set grid layerdefault
set xlabel "X LABEL"
set ylabel "Y LABEL"

set sample 11; set isosamples 11
set view map
set palette
set colorbox
set lmargin 0


set pm3d flush begin
set title "Datafile with different nb of points in scans; pm3d flush begin"
set pm3d flush begin noftriangles scansforward
splot 'triangle.dat'


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set title "Datafile with different nb of points in scans; pm3d flush center"
set pm3d flush center scansforward
replot

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set title "Datafile with different nb of points in scans; pm3d flush end"
set pm3d flush end scansforward
replot

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set grid front

set pm3d flush begin
set title "Data with different nb of points in scans; pm3d ftriangles flush begin"
set pm3d flush begin ftriangles scansforward
splot 'triangle.dat'
#show pm3d

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set title "Data with different nb of points in scans; pm3d ftriangles flush center"
set pm3d flush center ftriangles scansforward
replot

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set title "Data with different nb of points in scans; pm3d ftriangles flush end"
set pm3d flush end ftriangles scansforward
replot

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set title "Using interpolation with datafile; pm3d interpolate 2,1"
set pm3d flush begin noftriangles scansforward interpolate 2,1
replot

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set title "Using interpolation with datafile; pm3d ftriangles interpolate 10,1"
set pm3d flush begin ftriangles scansforward interpolate 10,1
replot

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set title "Using interpolation with datafile; pm3d at s ftriangles interpolate 10,1"
set pm3d flush begin ftriangles scansforward at s interpolate 10,1
set view 20,20
replot

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reset

set title "only for enhanced terminals: 'set format cb ...'"
set xlabel "X"
set ylabel "Y"
set sample 31; set isosamples 31
set xrange [-185:185]
set yrange [-185:185]
set format cb "%.01t*10^{%T}"
unset surface
set border 4095
set ticslevel 0
set pm3d at s; set palette gray
set cblabel "the colour gradient"
splot abs(x)**3+abs(y)**3

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unset cblabel

set pal color
set xrange [*:*]; set yrange [*:*]
set title "function 'x+y' using all colors available, 'set pal maxcolors 0'"
set pal maxcolors 0
splot x+y

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set xrange [*:*]; set yrange [*:*]
set title "function 'x+y' using only 5 colors, 'set pal maxcolors 5'"
set pal maxcolors 5
splot x+y

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set pal maxcolors 0
unset pm3d
set surface
set format z
set palette
set title "color lines: 'splot sin(y)/(y) with lines palette'"
set ticslevel 0
set border 4095
set xrange [-10:10]; set yrange [-10:10]
set hidden3d
set isosamples 40,40; set samples 40,40
splot sin(y)/(y) w lines palette

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reset

sinc(u,v) = sin(sqrt(u**2+v**2)) /sqrt(u**2+v**2)

set sam 40
set iso 40

set title "pm3d explicit mode --- coloring according to the 4th parameter of 'using'"
set ticslevel 0

set pm3d at s explicit

#	'binary2' binary u 1:2:(column(3)+column(-1)/20.0):3 w pm3d, 

splot \
	'binary2' binary u 1:2:3:($2+($1+$2)/10) w pm3d, \
	1+sinc(x*4, y*4) w l

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set title "coloring according to the 3rd 'using' parameter (left) and to the z-value (bottom)"
set border 895
splot \
    'binary2' binary u 2:(12 - column(3) * 10):1 notitle w lines, \
    'binary2' binary u (-12 + column(3) * 10):2:1:(-12 + column(3) * 10) notitle w pm3d, \
    'binary2' binary u 1:2:(column(3) * 10 - 12) notitle w pm3d


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reset

print "Plot by pm3d algorithm draws quadrangles filled with color calculated from"
print "the z- or color-value of the surrounding 4 corners. The following demo shows"
print "different color spots for a plot with very small number of quadrangles (here"
print "rectangular pixels). Note that the default option is 'mean'."

set pm3d at b
set view map
set style func pm3d
set iso 4
set samples 4
set xrange [0:3]
set yrange [0:3]
set cbrange [0:9]
f(x,y)=2*x+y
set key off
unset xtics
unset ytics
unset colorbox
set bmargin 0

# Note: no more space in the following multiplot to show demo for
#set pm3d corners2color median
#set pm3d corners2color geomean

set multiplot title "set pm3d corners2color mode"
# Let us do multiplot grid 3x3:
dx = 1.0/3; dy = 1.0/3;
set size dx,dy

set origin 0*dx,0*dy
set title "c1"
set pm3d corners2color c1
splot f(x,y)

set origin 2*dx,0*dy
set title "c2"
set pm3d corners2color c2
replot

set origin 0*dx,2*dy
set title "c3"
set pm3d corners2color c3
replot

set origin 2*dx,2*dy
set title "c4"
set pm3d corners2color c4
replot

set origin 1*dx,2*dy
set title "mean"
set pm3d corners2color mean
replot

set origin 2*dx,1*dy
set title "geomean"
set pm3d corners2color geomean
replot

set origin 1*dx,0*dy
set title "median"
set pm3d corners2color median
replot

set origin 0*dx,1*dy
set title "harmean"
set pm3d corners2color harmean
replot

set origin 1*dx,1*dy
set title "Original grid points"
unset pm3d
set border 0
unset xtics
unset ytics
unset colorbox
#splot x*2+y with points ps 3 pt 5 palette
splot f(x,y) with linesp ps 3 pt 5 palette

unset multiplot

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reset

print "End of pm3d demo."