Hi all,
I'm attempting to generate a plot with varying symbol colours. I've been able to scale my large range of data points to a 256 colour table but I haven't got the foggiest as how to scale the cgColorbar to match. At the bottom of this post is a simple example of what I'm attempting to do.
If I've understood seeds correctly then you should be able to see what I'm seeing. In which case, I would like to direct your attention to the annotated value of 0.000278858. Notice how the coloured symbol beside it does not match that in the colour bar.
Could anybody provide any assistance or clarity in this matter?
Richard
PRO demo_color_bar
seed1=-24
seed2=57
seed3=123
x = 10 * RANDOMU(Seed1, 50)
y = 100 * RANDOMU(Seed2, 50)
z1 = 1e-1 * RANDOMU(Seed3, 10)
z2 = 1e-2 * RANDOMU(Seed3, 10)
z3 = 1e-3 * RANDOMU(Seed3, 10)
z4 = 1e-4 * RANDOMU(Seed3, 10)
z5 = 1e-5 * RANDOMU(Seed3, 10)
z = [z1,z2,z3,z4,z5]
SET_PLOT, 'PS'
DEVICE, Decomposed=0, /ENCAPSUL, /COLOR, BITS=8, FILENAME='demo_color_bar.eps', /INCHES, XSIZE=11, YSIZE=11, FONT_SIZE=10, /BOLD
!P.MULTI = [0, 1, 1]
plotPosition = [0.125, 0.06, 0.8, 0.96]
cgplot, [0, max(x)], [0, max(y)], /NODATA, /YNOZERO, title='ColorBarDemo', xtitle='x', ytitle='y', position=plotPosition
col=34 ;color table
ncol=256 ;range of colors
min_range=min(z)
max_range=max(z)
;Define scale range, converting z values into floats of 0 to 255.
Colors_test = (((ncol-1)*ALOG10(min_range))/(ALOG10(min_range)-ALOG10(max_ range)))-(((ncol-1)*ALOG10(z))/(ALOG10(min_range)-ALOG10(max _range)))
cgloadct, col, NColors=ncol
PLOTSYM, 0, /FILL
FOR i=0,49 DO BEGIN
cgplot,[x[i]],[y[i]],PSYM = 8,/OVERPLOT,color=FIX(Colors_test[i])
ENDFOR
cgloadct, 0
cgtext,x[0],y[0],z[0],/DATA,ALIGNMENT=0.0
cgtext,x[25],y[25],z[25],/DATA,ALIGNMENT=0.0
cgtext,x[49],y[49],z[49],/DATA,ALIGNMENT=0.0
cgloadct, col, NColors=ncol
cgColorbar, Divisions=24, NColors=ncol, Range=[min_range,max_range], Title='z', Format='(E11.2)', Position=[0.06, 0.82, 0.96, 0.84], /VERTICAL, /RIGHT
DEVICE, /CLOSE
END
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