<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> </head> <body> Hi, I have been porting part of the Squeak PolygonMorph (in fact I am just porting the polygon part not the curved part). WIP file out attached, the Vector Engine Paste Up morph hack posted by Juan a few days ago is needed. I need to adress the #morphContainsPoint: The current code is as bellow, the filled polygon detection part seems to use the mask technique you described. <pre>containsPoint: aPoint (super containsPoint: aPoint) ifFalse: [^ false]. (closed and: [color isTransparent not]) ifTrue: [ ^ (self filledForm pixelValueAt: aPoint - bounds topLeft + 1) > 0]. self lineSegmentsDo: [ :p1 :p2 | (aPoint onLineFrom: p1 to: p2 within: (3 max: borderWidth+1//2) asFloat) ifTrue: [^ true]]. self arrowForms do: [ :f | (f pixelValueAt: aPoint - f offset) > 0 ifTrue: [^ true]]. ^ false </pre> Juan, can you document a bit more how to use your technique described bellow to make morph detection on the filled part of the polygon shape? Thanks Hilaire <div class="moz-cite-prefix">Le 19/06/2020 à 17:30, Juan Vuletich via Cuis-dev a écrit : </div> <blockquote type="cite" cite="mid:5EECDA11.5050308@jvuletich.org">VectorEngine already does this. It includes an extra buffer, ivar 'morphIds' in VectorEngine classes. Recently I also added ivar 'id' to Morph. For every pixel the engine draws in the context of a Morph, its id is stored at pixel position in morphIds. Then, it is just a matter of querying morphIds. For Cairo, the technique you wrote can be used. For regular, orthorectangular morhps in BitBlt canvas, the simple existing code can still be used. For morphs that use VectorGraphics to build cached Forms, as developed by Hilaire, it is just a matter of querying the form for transparency. All this means that soon no morph will need to include geometry specific code for hit detection (#morphContainsPoint:) at all. All we need to do is to make all this work consistently in a framework. </blockquote> <pre class="moz-signature" cols="72">-- GNU Dr. Geo <a class="moz-txt-link-freetext" href="http://drgeo.eu">http://drgeo.eu</a> <a class="moz-txt-link-freetext" href="https://pouet.chapril.org/@hilaire">https://pouet.chapril.org/@hilaire</a></pre> </body> </html>