Original Author Paul Laughton, 2011
Page 182
De Re BASIC!
Gr.get.value <object_ptr_nexp> {, <tag_sexp>, <value_nvar | value_svar>}...
The value of the parameter named <tag_sexp> ("left", "radius", etc.) in the Display List object
<object_ptr_nvar> is returned in the variable <value_nvar> or <value_svar>. This command can return
values from only one object at a time, but you may list as many tag/variable pairs as you want.
Most parameters are numeric. Only the Gr.text.draw "text" parameter is returned in a string var. The
parameters for each object are given with descriptions of the commands in this manual. For a complete
list of parameters, see the table in Gr.Modify.
Gr.modify <object_ptr_nexp> {, <tag_sexp>, <value_nexp | value_sexp>}...
The value of the parameter named <tag_sexp> in the Display List object <object_ptr_nvar> is changed to
the value of the expression <value_nexp> or <value_sexp>. This command can change only one object at
a time, but you may list as many tag/value pairs as you want.
With this command, you can change any of the parameters of any object in the Display List. The
parameters you can change are given with the descriptions of the commands in this manual. In addition
there are two general purpose parameters, "paint" and "alpha" (see below for details).You must provide
parameter names that are valid for the specified object.
The results of Gr.modify commands will not be observed until a Gr.render command executes.