color.gs

color - Set color table for drawing.

color
    (min max [int [inttype]] | -levs lev1 lev2 ... | -var var-name)
    [-div value]
    [-gxout gxout-name]
    [-kind string] [-alpha value]
    [-sample] [-xcbar [xcbar-args]]
    [-ret]
    [-verbose | -v]

Set color table for drawing e.g., shading and contour plot. You can set color setting with a combination of color name, RGB, or RGBA values. Transparent color is supported by GrADS 2.1 or later. To show help, simply run "color"

min max [int [inttype]]

Minimum, maximum, interval of variable values, and type of interval for color table. Follow GrADS standard if interval is not specified. inttype may be "linear" (default) or "fact".

-levs lev1 lev2 ...

Levels of variable value for color table.

-var var-name

Name of variable to draw. Minimum, maximum, and interval of variable values for color table are automatically generated following variable.

-div value

When min and max are specified without int, here you can set division number between [min:max]. Default value is "10".

-gxout gxout-name

Name for "set gxout". Default value is "shaded".

-kind string

Color list. Default string is "blue->white->red". See color list for details.

-alpha

Transparency of color. "0" for totally transparent. "255" for totally non-transparent. Default value is "255".

-sample

Draw color table.

-xcbar xcbar-args

Run xcbar.gs to draw color bar (xcbar.gs is necessary).

-ret

Pretend to be script function.

-v | -verbose

Verbose mode.

Color list for "-kind" option

(1) Draw t with default colors (blue->white->red) from 230 to 310 by 10.

ga-> open t.ctl
ga-> color 230 310 10
ga-> d t
ga-> cbar

(2) Draw 10hPa u with "lime->white->red" from -50 to 50.

ga-> open u.ctl
ga-> set lev 10
ga-> color -50 50 -kind lime->white->red
ga-> d u
ga-> cbar

(3) Draw contours with "maroon->red->white->blue->purple" from 0 to 5000 with the interval of 500.

ga-> open hgs.ctl
ga-> set gxout contour
ga-> color -gxout contour 0 5000 500 -kind purple->blue->white->red->maroon
ga-> d hgs

(4) Draw shaded hgs with "(R,G,B)=(100,100,100)→(100,150,0)→(200,50,150)" from 0 to 5000 divided by 20.

ga-> open hgs.ctl
ga-> color 0 5000 -div 20 -kind (100,100,100)->(100,150,0)->(200,50,150)
ga-> d hgs
ga-> cbarn

(5) Draw 500hPa t with rainbow shadings. max, min, and int are automatically determined according to the variable range.

ga-> open t.ctl
ga-> set lev 500
ga-> color -var t -kind rainbow
ga-> d t
ga-> cbar

(6) Draw only 100, 200, 500, 1000, 2000, and 5000 hgs contours with rainbow color.

ga-> open hgs.ctl
ga-> set lon 60 120
ga-> set lat 0 60
ga-> color -gxout contour -levs 100 200 500 1000 2000 5000
ga-> d hgs

(7) Draw sample colors "red->white"

ga-> color 1 10 -kind red->white -sample

(8) Draw sample colors "red->white" using xcbar.gs

ga-> color 1 10 -kind red->white -xcbar 1 10 0.5 0.7 -edge triangle -line on

(9) Draw sample colors "white->grainbow"

ga-> color 1 30 1 -kind white->grainbow -sample

(10) Draw sample colors "white->grainbow" with only one level for white.

ga-> color 1 30 1 -kind white-(0)->grainbow -sample

(11) Overlay 500hPa u with transparent gray on shaded 500hPa t.

ga-> open t.ctl
ga-> open u.ctl
ga-> set lev 500
ga-> d t
ga-> color -kind (127,127,127,196)->(127,127,127,0)->(127,127,127,196)
ga-> d u

• color.gs (necessary)
• xcbar.gs (if necessary)
• chcase.gsf (if necessary)
• qgxout.gsf (if necessary)
• color.gsf (if necessary)
  • Same as color.gs except for file name.