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## colorbar.gle

size 12 8
set font ss
include "barstyles.gle"
set lwidth 0.01

sub mypalette z
  ! Initialize r, g, b to the starting colour of the gradient.
  ! We are assuming ending colour is white (1,1,1).
  local r = 94/360
  local g = 19/360
  local b = 175/360
  
  return cvtrgb(z*(r-1)+1,z*(g-1)+1,z*(b-1)+1)
end sub

! Override built in bar_colormap
bar_colormap_pixels = 200  !What does this do?
sub bar_mycolormap x1 y1 x2 y2 b g
  amove x1 y1
  begin clip
    begin path clip
      box x2-x1 y2-y1
    end path
    colormap "y" 0 1 0 1 1 bar_colormap_pixels x2-x1 y2-y1 palette mypalette
  end clip
end sub

begin graph
  ytitle "Performance"
  data "colorbar.dat" 
  xaxis min 0.5 max 4.5 dticks 1
  yaxis min -5 max 85 dticks 10
  xdsubticks off
  x2axis off
  y2axis off
  yaxis grid
  yticks color grey20
  bar d1,d2 width 0.3,0.3 style mycolormap,mycolormap
end graph

## colorbar.dat

1  -2  7
2  10  9
3  50  45
4  70  80