[Dr. Geo] proportionOf:to: method ?

[address@hidden]

 There exists an instance method lengthOf: for the class DrGeoSketch which 
returns the length of (for example) a segment of a line.

 That works for me, and when I interactively change in the DrGeo 
SmalltalkSketch Editor the segment between two points, the length value is also 
updated automatically.

 Is there an instance method which computes the constant of proportionality for 
two segments ?

 A method for DrGeoSketch :  proportionOf:segment1 to:segment2

The message proportionOf:to: could be useful in many situations, perhaps also 
for other objects than line segments.

I've searched in the DrGeoSketch class in the browser, but I do not immediately 
see a proportionOf:to: method or something similar.

If this would need a "RFE" request for enhancement, how to file such a request 
please ?


An application could be to use the message in the following sketch


| sketch a b c A B C AB BC AC E D F G S |

sketch _ DrGeoSketch new.
a _ -2@-4.
b _ 2@-4.
c _ 0@1.
sketch text: 'Hoogtelijnen' at:-4@4.
sketch text: 'Omgekeerd evenredig met de zijden' at:-4@3.
sketch text: 'Waarop ze staan : AD:BE = AC:BC' at:-4@2.
A _ sketch point:a.
A name:'A'.A cross.
B _ sketch point:b.
B name:'B'.B cross.
C _ sketch point:c.
C name:'C'.C cross.
AB _ sketch segment: A to: B.
AC _ sketch segment: A to: C.
BC _ sketch segment: B to: C.
F _ sketch perpendicular:AC  at: B.
E _ sketch intersectionOf:F and:AC.
E name:'E'.
G _ sketch perpendicular:BC  at: A.
D _ sketch intersectionOf:G and:BC.
D name:'D'.
sketch angle:A to:C to:B.
sketch angle:B to:E to:C.
sketch angle:C to:D to:A.


I'd like to display the constant of proportionality 
AD:BE = AC:BC in the above code (see the SVG export in attach for an image).

Thanks,

David Stes

hoogtelijnevenredigheid.svg
Description: image/svg