I just found a Metapost example generating color transition, so it should work:

http://www.ursoswald.ch/metapost/tutorial/Colors.html

If you add this code to Metapost viewer ( http://www.tlhiv.org/mppreview/ ), you may see it:

u:=25;                    % 25 = 25bp = 25 PostScript points = 30/72 in

wi:=10;                   % width  in units u   

he:=10;                   % height in units u

hoehe:=he*u;              % height

breite:=wi*u;             % width

pair P[], xy[];

path p[];

transform t;

color c[];

n:=20; rd:=0.2; b:=(wi-2rd)/4;

P0:=(0, 0);

t:=identity scaled u shifted P0;

  fill (0, 0)--(breite, 0)--(breite, hoehe)--(0, hoehe)--cycle withcolor .9white;

  draw (0, 0)--(breite, 0)--(breite, hoehe)--(0, hoehe)--cycle;

  

  for k=0 upto 3:

    blau:=.3333k;

    P1:=(rd, he-rd-b)+k*b*(1, -1);

    for i=0 upto n-1:

      for j=0 upto n-1:

xy0:=P1+(i*b/n, j*b/n);

p0:=xy0--(xy0+(b/n, 0))--(xy0+(b/n, b/n))--(xy0+(0, b/n))--cycle;

c0:=((i+1)/n, (j+1)/n, blau);

fill p0 transformed t withcolor c0;

      endfor

    endfor

    draw (P1--(P1+(b, 0))--(P1+(b, b))--(P1+(0,b))--cycle) transformed t;

    P2:=(P1+(0, b))transformed t;

    label.lrt("bluepart c", P2);

    label.lrt("="&decimal blau, P2+(0, -3mm));

    label.urt("latex2html version 2002 - 1", (0,0));   

  endfor 

  

endfig;

end

28. 6. 2016 v 21:57, Bruce Mutton <bruce@tomo.co.nz>:

I also am mildly frustrated that colours in plan do not match elevation. Your solution sounds like night mare to edit subsequently however.

Maybe better approach would be to work on a graded map-fg colour that changes appropriately based on altitude of nearby stations and maybe point altitude or dimensions for plan.

And a simple gradation for elevations. 

To date i have been using similar approach to Footleg.

Bruce

Sent from my Samsung device, hence the typo's

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