Bar graph with shading of parts of bars based on other variables

[HP Williams]

Hello
Is it possible to make a bar graph where some parts of the graph are shaded?

* Example generated by -dataex-. For more info, type help dataex
clear
input float(id end rec res)
1  78   .   .
2 169   .   .
2   .  20  30
2   .  80 140
3 365   .   .
3   .  60 200
4 365   .   .
4   .  20 120
4   . 160 200
5   .  10 300
5 365   .   .
6 365   .   .
end

Im generating the bargraph as a horizontal bar with length defined by the variable 'end' and I also have intervals within the bars defined by variables 'rec' and 'res'

tw (bar end id, hor bcolor(blue%20) lcolor(none) lwidth(vthin))(scatter id rec, mcolor(blue) msize(tiny) msymbol(square))(scatter id
> res, mcolor(red) msize(tiny) msymbol(square)), ylabel(none) ymtick(none)

I want to shade the bar black or some other color between the blue and red markers on each bar like this (mockup in MS paint)

Any help would be appreciated

thanks!

HP

[HP Williams]

Also, If its not possible to shade a bar like above, any ideas for how could do something visually similar
tx!

[Nick Cox]

tw bar end id, hor bcolor(blue%20) lcolor(none) lwidth(vthin) ///
|| rbar rec res id, hor bcolor(blue) ylabel(none) ymtick(none)

[HP Williams]

perrfect!
thanks!