Re: Output PNGs in different sizes

Hi Jonas,

I'm not sure if this is a bug or the correct behavior, but you can't change the size of the PNG output after you've already created it with gsn_open_wks.

In other words, using "setvalues" to change the size will never work.

I'll file a ticket on this just in case.

Meanwhile, if you want to get different sizes, you will need to open up a new PNG file with a new call to gsn_open_wks and a different file name.

I've attached a small example.

--Mary

On Jun 18, 2012, at 10:17 AM, Jonas Kaufmann wrote:

> Hello,
>
> I am trying to generate PNGs in different sizes from GRIB weather
> data. The map should always show the same area, but the output PNG
> files should have different sizes. I know that I can call the output
> function (like gsn_csm_vector_scalar_map) in a loop, but I am looking
> to get a better performance than this approach.
>
> In the "Animation" examples, I see that I can set some variables
> afterwards and then simply call draw and frame for the next animation
> step. However it seems that these options are not available for
> wkWidth and wkHeight.
>
> Here are some snippets of my script:
>
> wks_type = "png"
> wks_type@wkWidth = 256
> wks_type@wkHeight = 256
> wks = gsn_open_wks(wks_type,outfile)
> [...]
> ;;; first image: 256x256px
> plot = gsn_csm_vector_scalar_map(wks, wind_u, wind_v, wind_speed, res1)
> draw(plot)
> frame(wks)
>
> ;;; second image: 512x512px
> setvalues wks
> "wkHeight" : 512
> "wkWidth" : 512
> end setvalues
> draw(plot)
> frame(wks)
>
>
> I get images in my outfile name with "000001", "000002" etc. appended,
> but they are always the same size, the one that I originally set. Is
> there a way to change the PNG output size with setvalues? Or is there
> another way to achieve a better performance for my task than simply
> calling the gsn_csm_vector_scalar_map method in a loop?
>
>
> Thank you for your help!
>
> Best regards
>
> Jonas
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