[Moose-dev] Brainstorming : composition of shapes

Hi! I’ve just introduced a new class TRExtensibleLabelShape and TRLabelShape. This will ease the problem we are experiencing with using labels in a composed shape. I would like now to discuss about how to compose shapes. This has been a big discussion for at least 5 years. I propose a solution in this email, I hope this will make most of us happy :-) Consider the example: -=-=-=-=-=-=-=-= | v s1 s2 c es | v := RTView new. s1 := (RTEllipse new size: #yourself; color: (Color blue alpha: 0.4)). s2 := (RTLabel new text: 'Hello World'; height: 10). c := RTCompositeShape new shape1: s1; shape2: s2; offset2: 0 @ -30. es := c elementsOn: #(30 60 80). es @ RTDraggable. v addAll: es. es when: TRMouseClick do: [ :evt | evt element remove. v signalUpdate ]. RTHorizontalLineLayout on: v elements. v open -=-=-=-=-=-=-=-= This is the output: If you click on an element, then the element with its label is properly removed. Yupi! Leo will be happy with that :-) The reason is that how can I specify to have s2 above s1? What should I put in offset2 ? Instead of fiddling with blocks like [:shape1 :shape2 :element | … ] I have introduced RTHorizontalCompositeShape and RTVerticalCompositeShape just to try whether it make sense or not. We can have -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= | v s1 s2 c es | v := RTView new. s1 := (RTEllipse new size: #yourself; color: (Color blue alpha: 0.4)). s2 := (RTLabel new text: 'Hello World'; height: 10). c := RTHorizontalCompositeShape new shape1: s1; shape2: s2. es := c elementsOn: #(30 60 80). es @ RTDraggable. v addAll: es. RTHorizontalLineLayout on: v elements. v -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Replacing Horizontal by Vertical works as expected. You can also compose these things. Look at that: -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= | v s1 s2 c es | v := RTView new. s1 := (RTEllipse new size: #yourself; color: (Color blue alpha: 0.4)). s2 := (RTLabel new text: 'Hello World'; height: 10). c2 := RTVerticalCompositeShape new shape1: s1; shape2: s2. c := RTHorizontalCompositeShape new shape1: s1; shape2: c2. es := c elementsOn: #(30 60 80). es @ RTDraggable. v addAll: es. RTHorizontalLineLayout on: v elements. v -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Are we happy with RTVerticalCompositeShape, RTHorizontalCompositeShape and RTCompositeShape ? If yes, then RTLabelling (and its problem of passing the view along :-) will be obsolete. Cheers, Alexandre -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.