I am having two problems with SCALE.
1. I cannot set bounds to anything other than integers. For example:
(make-instance 'scale :from 0 :to (* 2 pi) ...
gives me an error.
2. I am unable to retrieve the :VARIABLE value
In the below, vales of UPPER-THETA and FORE-THETA never seem to be anything but
0, no matter where I slide the scale. I have tested all the drawing an update
code, I am stumped!
(defun controltest ()
"Test of a user-controlled robot arm"
(with-ltk ()
(let* ((upper-theta 0) (fore-theta 0)
(upper-slider
(make-instance 'scale :from 0 :to 7
:length 360 :variable upper-theta))
(fore-slider
(make-instance 'scale :from 0 :to 7
:length 360 :variable fore-theta))
(cnvs (make-instance 'canvas :width cnvs-width :height cnvs-height))
(upper (manip:uctk-beam :cen-x 200 :cen-y 200
:b-length 40 :b-width 20
:tk-cnvs cnvs))
(fore (manip:uctk-beam :cen-x 0 :cen-y 40 ; relative to upper
:b-length 40 :b-width 20
:tk-cnvs cnvs))
(slp-time 50) #|ms|# )
(labels ((update ()
(draw upper nil) ; contains FORE, no need to draw separately
(geo:set-member-theta upper 2 fore-theta)
(geo:set-theta upper upper-theta)
(after slp-time #'update)))
(geo:add-geo upper fore) ; make FORE a member of UPPER
(pack cnvs :fill :both :expand 1)
(pack upper-slider :side :bottom)
(pack fore-slider :side :bottom)
(update)))))
