common lisp - Acessing values of ltk widget options -

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i trying make gui application in common lisp ltk, , there 1 thing cannot figure out. know can set options of ltk widgets configure, cannot figure out way read values.

for example, create instance of canvas 

(make-instance 'canvas :width 400 :height 400)

then want write method use width , height in calculations. how access these?

i've asked same question in ltk user list , got answer.

in short, cget function counterpart of configure

so, set canvas width (configure canvas :witdh value) , retrieve (cget canvas :width).

regards,

andré


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