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color and tvellipse [message #75631]

Tue, 15 March 2011 14:01

Gray
Messages: 253
Registered: February 2010

Senior Member

Hi all,

I want to draw a number of ellipses with TVEllipse, and have the color
of each ellipse correspond to one of the colors in a discrete
colorbar. I'm using CG, so I created the plot with cgPlot, /nodata...
then I loaded the color table with cgLoadCT, and created the colorbar
with cgDCBar. However, when I try to use the color indices with
TVEllipse, they all are plotted in black. Any suggestions?

Here's my code:

cgplot, indgen(3), /nodata, xra=[x0,x1], yra=[y0,y1],$
xst=1, yst=1, charsize=1.25, xtitle='Right Ascension (hours)', $
ytitle='Declination (hours)', title='Survey Extent', $
position=[0.1,0.1,0.85,0.9]
for i=0,nd-1 do $
cgplots, ra[*,i], dec[*,i]
for i=0,nr-1 do $
cgplots, ra[i,*], dec[i,*]
cgloadct, 25, /brewer, ncolors=12, bottom=1
cgdcbar, ncolors=12, bottom=1, color='navy', $
labels=themonths(/abbrev),/vertical
for i=0,nday-1,10 do tvellipse,3,45,ra0[i],dec0[i],0,months[i],/data

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