Question about the TickMark resources and the changes of viewport width.

Hi, all

A lot of TickMark (tm) resources' values scales proportionally to changes in the width of the viewport. Sometime, I need to reduce the viewport height of the plot for puting several plot into one panel using gsn_panel() and keep the default values (for a viewport width of 0.6) of the tickmark objects. How to cutoff the connection between TickMark and viewport?

Confusely, there are some different cases about the connection between TickMark and viewport.

;-----------------------------------------------------------
Case 1. set the vpWidthF before plot:

res = True
res@vpWidthF = 0.3

plot1 = gsn........ ;first plot with res
plot2 = gsn........ ; second plot with res
......

All the TickMark of plots change with viewport Width 0.3.

;-----------------------------------------------------------

Case 2. set the vpWidthF after one plot:

res = True

plot1 = gsn........ ;first plot with res
res@vpWidthF = 0.3
plot2 = gsn........ ; second plot with res
......

Of course, the tickmarks of plot1 is proportional to the default vpWidthF 0.6. But the tickmarks of the plot2 do not change with the vpWidthF 0.3!

;----------------------------------------------------------------

Case 3. set the vpWidthF before one plot and change vpWidthF again after this plot :

res = True
res@vpWidthF = 0.5
plot1 = gsn........ ;first plot with res
res@vpWidthF = 0.3
plot2 = gsn........ ; second plot with res
......

First, the tickmarks of plot1 reduce with the changes of vpWidthF = 0.5 like the case 1. But the tickmarks of the plot2 reduce with the changes of the vpWidthF 0.3 too. This is not like the case 2.

;------------------------------------------------------------------

So I have to add a unneccessary plot befor setting vpWidthF as case 2 to keep proper tickmark sizes and viewport height in the plot2 and hereafters.

I am very confused with these three cases. Could anyone explain these cases and give a proper setting to cutoff the connection between tickmark and viewport?

Best regards.

Huang Ping

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Received on Sat Nov 14 22:50:16 2009