dshade.gs
/ 
- Note: Since GrADS 2.1 or later supports transparent color, this script will be removed in future. Also use color.gs which supports transparent color.
Name
xcbar - Draw two shading figures.
Synopsis
1: Set background color
dshade set back color-args...
2: Set overlay color
dshade set over [-alpha min max] color-args...
3: Draw
dshade draw var-back var-over
Description
Use GrADS 2.0 or higher. Only x-y cross section is supported now. To show help, simply run "color".
Options
1: Set background color
- color-args
- Same as color.gs.
2: Set overlay color
- color-args
- Same as color.gs.
- -alpha min max
- Start and end value of transparency. 0-255.
3: Draw
- var-back
- Background variable.
- var-over
- Variable to overlay.
Examples
(1) Draw zonal wind over topography
ga-> open hgs.ctl ga-> open u.ctl ga-> dshade set back -levs 0 1000 -kind (96,96,148)->(94,118,58)->(74,44,19) ga-> dshade set over -levs -50 0 50 -kind (255,255,255)->(255,255,255) -alpha 230 0 ga-> dshade draw hgs-100 u.2
(2) Draw zonal wind over topography (high resolution)
Use dummy control file with high resolution and interpolate to its variable.
ga-> open dshade_sample2.ctl ga-> open hgs.ctl ga-> open u.ctl ga-> vback = lterp(hgs.2(t=1)-100, dummy) ga-> vover = lterp(u.3(z=1,t=1), dummy) ga-> dshade set back -levs 0 1000 -kind (96,96,148)->(94,118,58)->(74,44,19) ga-> dshade set over -levs -50 0 50 -kind (255,255,255)->(255,255,255) -alpha 230 0 ga-> dshade draw vback vover
- dshade_sample2.ctl
DSET ^dummy.grd OPTIONS TEMPLATE UNDEF -9.99e+20 *XDEF 360 LINEAR 0.0 1 *YDEF 181 LINEAR -90.0 1 XDEF 3600 LINEAR 0.0 0.1 YDEF 1801 LINEAR -90.0 0.1 *XDEF 7200 LINEAR 0.0 0.05 *YDEF 3601 LINEAR -90.0 0.05 ZDEF 1 LEVELS 0.0 TDEF 1 LINEAR 01jan2000 1mo VARS 1 dummy 0 99 dummy ENDVARS
(4) Draw zonal wind over topography (high resolution) No.2
ga-> open dshade_sample3.ctl ga-> open hgs.ctl ga-> open u.ctl ga-> vback = lterp(hgs.2(t=1)-100, dummy) ga-> vover = lterp(u.3(z=1,t=1), dummy) ga-> dshade set back -levs 0 100 500 1000 2000 3000 5000 -kind blue->lime->limegreen->green->maroon->purple->red->silver ga-> dshade set over 0 40 1 -kind (255,255,255)->(255,255,255) -alpha 0 230 ga-> dshade draw vback vover
- dshade_sample3.ctl
DSET ^dummy.grd OPTIONS TEMPLATE UNDEF -9.99e+20 *XDEF 360 LINEAR 0.0 1 *YDEF 181 LINEAR -90.0 1 XDEF 1800 LINEAR 0.0 0.2 YDEF 901 LINEAR -90.0 0.2 *XDEF 7200 LINEAR 0.0 0.05 *YDEF 3601 LINEAR -90.0 0.05 ZDEF 1 LEVELS 0.0 TDEF 1 LINEAR 01jan2000 1mo VARS 1 dummy 0 99 dummy ENDVARS
Script source code
- dshade.gs (necessary)
- color.gsf (necessary)
- getstr.gsf (necessary)
- setstr.gsf (necessary)
- strmem.gsf (necessary)