<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> </head> <body text="#000000" bgcolor="#FFFFFF"> Hi Juan, Answer in the text. <div class="moz-cite-prefix">Le 25/06/2021 à 15:01, Juan Vuletich a écrit : </div> <blockquote type="cite" cite="mid:60D5D3C3.9080409@jvuletich.org">So, what is that you are in need for? - The ability to select several morphs at a time (without grabbing them), so you can later do something with them? (this could include ways to add / remove morphs from "current selection") </blockquote> That is more like that. I want to select the morphs (views of math models) at a given distance of the mouse cursors: <pre>DrGDynamicTool>>myMorphsNear: aPoint "Only morphs where feedback and action are wished, not hidden, wanted and under mouse cursor" | globalPoint | globalPoint _ self drawable morphPositionInWorld + aPoint. ^self app morphs select: [:aMorph | aMorph style isNotHidden and: [(self isWanted: {aMorph mathItem}) and: [aMorph containsPoint: globalPoint]]] </pre> Previously I was doing this computation per type of morph. For example, for a circle morph, I wrote a simple method (wrongly named btw) like bellow to detect when the mouse cursor is at distance below 20 pixels of the circle line: <pre>DrGCircleMorph>>containsPoint: aPoint "it is a circle so height and width is the diameter" ^((self center dist: aPoint) - (self height / 2)) abs < 20 </pre> With thin morphs as line, to ease the user experience, you really don't want to limit morph selection to the width of the line, it will make a terrible usability. Of course I can rewrite these methods, but as Vector Graphics comes with a new way to detect the morph at a given coordinates, it will be a great addition to have a general method to detect if a morph is within a given distance of a point. Just random though: If I understood correctly, you use an array of points to represent the pixels of the screen and the morphs id filling these pixels. I guess you can have several morph id per pixels, then selecting the morph ids bellow a disc on this field of pixel is reasonably doable. I guess morphs collision could be done too. Thanks Hilaire <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="http://blog.drgeo.eu">http://blog.drgeo.eu</a></pre> </body> </html>