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pp_cmap.pro

Routines

top source pp_cmap

result = pp_cmap(nc [, lct=lct] [, grey=grey] [, hls=hls])

Returns a colormap with nc saturated colors equally spaced in hue, plus black, white and one grey.

Return value

A (3,(nc+3)) array, where each row contains the HLS or RGB values for each color. The first color is black, the last is white, the one before last is grey, and the equally spaced saturated colors lie in between, in hue order.

Parameters

nc in required

Number of equally spaced saturated colors to make.

Keywords

lct in optional default=0

If set, the colormap created is loaded with tvlct.

grey in optional default=0.5d0

The intensity of the grey color to make.

hls in optional default=0

If set, the colors returned are in HLS space, instead of RGB space.

Examples

Make a plot with pure black, red, green and blue lines:

 cmap=pp_cmap(3)
 for i=0,3 do iplot,randomu(seed,10),color=cmap[*,i],over=(i ne 0),thick=2.

Make a plot with pure black, red, yellow, green, cyan, blue and magenta lines:

 cmap=pp_cmap(6)
 for i=0,6 do iplot,randomu(seed,10),color=cmap[*,i],over=(i ne 0),thick=2.

Make an eps in direct graphics pre-IDL 7.1:

 cmap=pp_cmap(3)
 olddev=!d.name ;keep a copy of the current device name
 set_plot,'ps'
 device,filename='pp_cmap.eps',/encapsulated,/color,decomposed=0
 tvlct,old1,old2,old3,/get ;keep a copy of the current colormap
 tvlct,cmap[0,*],cmap[1,*],cmap[2,*] ;change the colormap
 plot,[0d0,9d0],[0d0,1d0],/nodata
 for i=0,3 do oplot,randomu(seed,10),color=i,thick=2.
 tvlct,old1,old2,old3 ;restore the old colormap
 device,/close
 set_plot,olddev ;restore the old device name

Make an eps in direct graphics with truecolor (only available from IDL 7.1):

 cmap=pp_cmap(3)
 olddev=!d.name ;keep a copy of the current device name
 set_plot,'ps'
 device,filename='pp_cmap.eps',/encapsulated,/color,decomposed=1
 plot,[0d0,9d0],[0d0,1d0],/nodata
 for i=0,3 do oplot,randomu(seed,10),color=cmap[0,i]+cmap[1,i]*2L^8+cmap[2,i]*2L^16,thick=2.
 device,/close
 set_plot,olddev ;restore the old device name

Author information

Author:: Paulo Penteado (pp.penteado@gmail.com), Dec/2009

Statistics

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Cyclomatic complexity:	5
Modified cyclomatic complexity:	5

File attributes

Modification date:	Wed Jun 29 22:15:28 2016
Lines:	20
Docformat:	rst rst

Documentation for pp_lib

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