<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta content="text/html; charset=UTF-8" http-equiv="Content-Type"> </head> <body bgcolor="#ffffff" text="#000000"> Hi Hilaire, On 8/15/2021 7:14 AM, Hilaire Fernandes via Cuis-dev wrote: <blockquote cite="mid:4a0e0ea0-8567-93ae-60a4-0141b2797b35@drgeo.eu" type="cite"> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> Hi Juan, I have noted that with a drawn circle[1], so not filled contrary to a disc, the detection method in subject respond true when the point is on any position inside the circle. It should be true only when the circle is filled (disc). </blockquote> Well, we can detect with pixel precision only one morph, the visible one. I think you had asked about detecting all the (possibly overlapping) morphs that are at some point (or close to it). Adding a stack of morphID at each pixel is extremely memory intensive. We could easily need half a gigabyte of memory for a 4k display. Then I came up with the contour idea, that only requires a maximum of 16 kBytes per morph (i.e. most likely never more than a couple of megabytes). But contours record, for each display y(i.e. for each line) the leftmost and rightmost affected pixels. It is a kind of "convex hull". I don't know a general, all-morphs solution that doesn't require a ton of RAM. If you can live with detecting only the top morph, then #containsGlobalPoint: (or a new method that also takes into account a distance), is a possible solution. If you absolutely need detecting all morphs, but not at "transparent" inner points, and, it is only for instances of a few classes, like line and circle, then implementing a specific method in those classes is an alternative. It would be quite complicated if you also need, for example, Beziers. I'm sorry I don't know a better solution. <blockquote cite="mid:4a0e0ea0-8567-93ae-60a4-0141b2797b35@drgeo.eu" type="cite"> Btw, when I insert an halt in the draw method, it freezes the image. You fixed this issue previously, may be it is a regression or something else. </blockquote> Right now, #drawOn: is protected against Error, but not against Halt. Just played a bit with an improvement. Will push it later. <blockquote cite="mid:4a0e0ea0-8567-93ae-60a4-0141b2797b35@drgeo.eu" type="cite"> Best Hilaire [1] Draw as: DrGCircleMorph>>drawCircleOn: aCanvas | center r | center _ self drawable worldToMorph: mathItem center. r _ self drawable worldToPixel: mathItem radius. style isFilled ifTrue: [ aCanvas strokeWidth: style borderWidth color: borderColor fillColor: color do: [ aCanvas circleCenter: center radius: r] ] ifFalse: [ aCanvas strokeWidth: style borderWidth color: borderColor do: [ aCanvas circleCenter: center radius: r] ] <pre class="moz-signature" cols="72">-- GNU Dr. Geo <a moz-do-not-send="true" class="moz-txt-link-freetext" href="http://drgeo.eu">http://drgeo.eu</a> <a moz-do-not-send="true" class="moz-txt-link-freetext" href="http://blog.drgeo.eu">http://blog.drgeo.eu</a></pre> </blockquote> Cheers, <pre class="moz-signature" cols="72">-- Juan Vuletich <a class="moz-txt-link-abbreviated" href="http://www.cuis-smalltalk.org">www.cuis-smalltalk.org</a> <a class="moz-txt-link-freetext" href="https://github.com/Cuis-Smalltalk/Cuis-Smalltalk-Dev">https://github.com/Cuis-Smalltalk/Cuis-Smalltalk-Dev</a> <a class="moz-txt-link-freetext" href="https://github.com/jvuletich">https://github.com/jvuletich</a> <a class="moz-txt-link-freetext" href="https://www.linkedin.com/in/juan-vuletich-75611b3">https://www.linkedin.com/in/juan-vuletich-75611b3</a> @JuanVuletich</pre> </body> </html>