1.149.1 Instance variables

spatial <-> w_to: =*

spatial <-> h_to: =*

Equation (= object) relating the following variables:

w	area<-width of the constraint<-from graphical
h	area<-height of the constraint<-from graphical
w2	area<-width of the constraint<-to graphical
h2	area<-height of the constraint<-to graphical

Examples:

w = w2	Equally wide
w = w2 + 10	constraint<-to is 10 pixels wider

spatial <-> x_to: =*

spatial <-> y_from: =*

spatial <-> y_to: =*

spatial <-> x_from: =*

These equations define the reference points on both graphical objects constrained. They should be defaulted or specified in pairs: if spatial<-x_from is specified so must spatial<-x_to and likewise for spatial<-y_from and spatial<-y_to.

The reference points of both objects are constrained to be at the same location.

During the evaluation of the = object, the following variables are available:

xref	the x coordinate of the reference-point
yef	the y coordinate of the reference-point
x	spatial<-x of the graphical's graphical<-area
y	spatial<-y
w	spatial<-width
h	spatial<-height