March 2025 - Pharo-users - lists.pharo.org

Re: Updating a Form after changing pixel values

by Renaud de Villemeur

Hi Mikael If my understanding is correct, you're using SpImagePresenter to display a Form.Â You then have made some changes toÂ the Form and you want to show its new face.Â Why don't you set the image again in your presenter ? Something likeÂ `image image: yourUpdatedForm`. You can even update the Form of your presenter directly like: `image image: (image image pixelValueAt: 10@10 put: (image imageÂ pixelValueFor: Color red))` image being an instance of SpImagePresenter. Renaud Mar 7, 2025, 13:53 by mikael.svane(a)fridhem.org: > > I have a Form where I change pixel colours using Form>>pixelValueAt:put:. The Form exists inside an SpImagePresenter. After having changed the pixels, I want to redraw the Form in an #updatePresenters method to show the changes, but I havenât been able to figure out how to do this. If I inspect the Form it is clear that the pixels have been changed, so the problem is in the #updatePresenters mwthod. I have tried different variations on this theme without success: > > > Â > > > updatePresenter > > > Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â | canvas | > > > Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â âGet the canvas of the Form:â > > > Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â canvas := imagePresenter image form getCanvas. > > > Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â > > > Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â adapter widget drawSubmorphsOn: canvas > > > Â > > > > > > Any suggestions would be very welcome. > > > Â > > > Kind regards, > > > Mikael > >

March 8, 2025

Updating a Form after changing pixel values

by Mikael Svane

I have a Form where I change pixel colours using Form>>pixelValueAt:put:. The Form exists inside an SpImagePresenter. After having changed the pixels, I want to redraw the Form in an #updatePresenters method to show the changes, but I haven't been able to figure out how to do this. If I inspect the Form it is clear that the pixels have been changed, so the problem is in the #updatePresenters mwthod. I have tried different variations on this theme without success: updatePresenter | canvas | "Get the canvas of the Form:" canvas := imagePresenter image form getCanvas. adapter widget drawSubmorphsOn: canvas Any suggestions would be very welcome. Kind regards, Mikael

March 7, 2025

Re: Converting global coordinates from a mouse event

by Mikael Svane

Hi Renaud, Yes, I use Spec with the Morphic graphical library and with the calculation that you described, I got the correct answer for the coordinates within the Morph representing the image (Form). Because I was using an autoscaling image, I had then to do one more step by scaling the local coordinates according to the scale of the image, but that was very easy. Thanks! Kind regards, Mikael FrÃ¥n: Renaud de Villemeur via Pharo-users [mailto:pharo-users@lists.pharo.org] Skickat: den 5 mars 2025 02:13 Till: Any question about pharo is welcome Kopia: Any question about pharo is welcome; Renaud de Villemeur Ãmne: [Pharo-users] Re: Converting global coordinates from a mouse event Hi Mikael I assume you use spec with the Morphic underlying graphical library. In your presenter: - `anEvent position` will give you the event position in the global world coordinate. - `self adapter widget position.` will give you the top left corner underlying Morph position in the global world coordinate. `anEvent position - self adapter widget position` should give you the position you're looking for. Renaud Mar 3, 2025, 03:17 by mikael.svane(a)fridhem.org: I have a presenter that is a subclass of SpPresenterWithModel and it contains, among other things, an ImagePresenter with an autoscaling image (a Form). I want to capture mouse clicks on the image and get the coordinate of the click relative to the upper left corner of the Form. My #initializePresenter method looks like this: initializePresenter image := self newImage image: self emptyImage; autoScale: true. image eventHandler whenMouseDownDo: [ :event | self handleMouseDown: event]. This works, and the #handleMouseDown: method is run whenever the mouse is pressed on the ImagePresenter, but the MouseButtonEvent reports global coordinates and I canât find out how to convert these to coordinates relative to the Form that the ImagePresenter holds. I have googled and found answers to similar old questions, but nothing that seems to apply to Spec2. There must be a very simple solution to this, itâs just that I canât seem to find it. Kind regards, Mikael

March 5, 2025

Re: Converting global coordinates from a mouse event

by Renaud de Villemeur

Hi Mikael I assume you use spec with the Morphic underlying graphical library. In your presenter:Â - `anEvent position` will give you the event position in the global world coordinate. - `self adapter widget position.` will give you the top left corner underlying Morph position in the global world coordinate. `anEvent position - self adapter widget position` should give you the position you're looking for. Renaud Mar 3, 2025, 03:17 by mikael.svane(a)fridhem.org: > > I have a presenter that is a subclass of SpPresenterWithModel and it contains, among other things, an ImagePresenter with an autoscaling image (a Form). I want to capture mouse clicks on the image and get the coordinate of the click relative to the upper left corner of the Form. > > > Â > > > My #initializePresenter method looks like this: > > > initializePresenter > > > Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â image := self newImage > > > Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â image: self emptyImage; > > > Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â autoScale: true. > > > Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â image eventHandler whenMouseDownDo: [ :event | > > > Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â self handleMouseDown: event]. > > > Â > > > This works, and the #handleMouseDown: method is run whenever the mouse is pressed on the ImagePresenter, but the MouseButtonEvent reports global coordinates and I canât find out how to convert these to coordinates relative to the Form that the ImagePresenter holds. I have googled and found answers to similar old questions, but nothing that seems to apply to Spec2. > > > Â > > > There must be a very simple solution to this, itâs just that I canât seem to find it. > > > Â > > > Kind regards, > > > Mikael > >

March 5, 2025

Re: Converting global coordinates from a mouse event

by Mikael Svane

Thanks, but unfortunately that doesnât work. The object stored in the image variable is an ImagePresenter, not a Morph, so it doesnât understand globalPointToLocal:. However, the ImagePresenter contains an adapter (an SpMorphicBoxAdapter) which has a variable called widget containing an AlphaImageMorph which must represent the image. But if I send the #globalPointToLocal: message to the AlphaImageMorph instance it just returns the same point that it was given as argument. This must be because Morph>>globalPointToLocal: is implemented as: Morph>>globalPointToLocal: aPoint ^self point: aPoint from: nil and: Morph>>point: aPoint from: aReferenceMorph owner ifNil: [^ aPoint]. ^ (owner transformFrom: aReferenceMorph) globalPointToLocal: aPoint Since these definitions are the only one in any of the Morph subclasses, aReferenceMorph will always be nil for all Morphs and Morph>>point: aPoint from: aReferenceMorph (and Morph>>globalPointToLocal:) will always return the same point that it was given as argument. This seems a bit strange. After some more research, I found a similar question from 2012 where the #globalPointToLocal: method was apparently working: http://forum.world.st/Mouse-handler-on-a-morph-td4603302.html So at the moment I am not sure if #globalPointToLocal: is the intended way of transforming coordinates, perhaps with a bug, or if there is new way of transforming coordinates and this is just old code that has not been removed from the image. At first, I would have guessed that coordinate transformation should have been handled by the different Layouts used, but this doesnât seem to be the case. Any further suggestions are very welcome! Kind regards, Mikael FrÃ¥n: sducasseatwork--- via Pharo-users [mailto:pharo-users@lists.pharo.org] Skickat: den 4 mars 2025 12:37 Till: Any question about pharo is welcome Kopia: sducasseatwork(a)mailo.com Ãmne: [Pharo-users] Re: Converting global coordinates from a mouse event I did a little search and I found Morph >> globalPointToLocal: aPoint ^self point: aPoint from: nil may be image eventHandler whenMouseDownDo: [ :event | self handleMouseDown: event image globaâ¦.. ]. On 2 Mar 2025, at 22:00, Mikael Svane <mikael.svane(a)fridhem.org> wrote: I have a presenter that is a subclass of SpPresenterWithModel and it contains, among other things, an ImagePresenter with an autoscaling image (a Form). I want to capture mouse clicks on the image and get the coordinate of the click relative to the upper left corner of the Form. My #initializePresenter method looks like this: initializePresenter image := self newImage image: self emptyImage; autoScale: true. image eventHandler whenMouseDownDo: [ :event | self handleMouseDown: event]. This works, and the #handleMouseDown: method is run whenever the mouse is pressed on the ImagePresenter, but the MouseButtonEvent reports global coordinates and I canât find out how to convert these to coordinates relative to the Form that the ImagePresenter holds. I have googled and found answers to similar old questions, but nothing that seems to apply to Spec2. There must be a very simple solution to this, itâs just that I canât seem to find it. Kind regards, Mikael

March 4, 2025

Re: Converting global coordinates from a mouse event

by sducasseatwork＠mailo.com

I did a little search and I found Morph >> globalPointToLocal: aPoint ^self point: aPoint from: nil may be > image eventHandler whenMouseDownDo: [ :event | > self handleMouseDown: event image globaâ¦.. > ]. > On 2 Mar 2025, at 22:00, Mikael Svane <mikael.svane(a)fridhem.org> wrote: > > I have a presenter that is a subclass of SpPresenterWithModel and it contains, among other things, an ImagePresenter with an autoscaling image (a Form). I want to capture mouse clicks on the image and get the coordinate of the click relative to the upper left corner of the Form. > > My #initializePresenter method looks like this: > initializePresenter > image := self newImage > image: self emptyImage; > autoScale: true. > image eventHandler whenMouseDownDo: [ :event | > self handleMouseDown: event]. > > This works, and the #handleMouseDown: method is run whenever the mouse is pressed on the ImagePresenter, but the MouseButtonEvent reports global coordinates and I canât find out how to convert these to coordinates relative to the Form that the ImagePresenter holds. I have googled and found answers to similar old questions, but nothing that seems to apply to Spec2. > > There must be a very simple solution to this, itâs just that I canât seem to find it. > > Kind regards, > Mikael

March 4, 2025

MISS-ABMS course in Montpellier (September 2025)

by bommel＠cirad.fr

Hello, This is the announcement for the next Agent-Based Modelling course: MISS-ABMS, *M*ulti-platform*I*nternational*S*ummer*S*chool on*A*gent-*B*ased*M*odelling &*S*imulation for renewable resources management *MISS-ABMS 2025, 8-19 September 2025, Agropolis, Montpellier (France)* By taking part in this course, you will gain a modelling culture and learn the different skills required for building agent-based models (ABMs) applied to sociological, ecological, or socio-ecological systems. *Key points* Â·MISS-ABMS is multi-cultural in terms of background and nationalities of the trainers and participants Â·MISS-ABMS promotes a collaborative practice of modelling and simulation Â·MISS-ABMS is multi-platform: Cormas-Pharo, Gama and NetLogo Â·MISS-ABMS presents the different stages of an ABM process, with a focus on model design and implementation Â·MISS-ABMS offers a significant time for group work to design and implement an ABM *For who* Â·Each year we enjoy having participants with very heterogeneous profiles in terms of age, nationality, scientific background and experience in modelling or coding. Beginners in ABM who are planning to participate in a modelling project in the months following the training are welcomed. Â·If you have any concern regarding your participation, feel free to ask at: miss-abms_organizers[at]agropolis[dot]fr *Information and registration* Â·For more details see the summer school website:https://www.agropolis.fr/MISSABMS Â·If you intend to participate, please complete theapplication form <https://www.agropolis.fr/MISS-ABMS-APPLICATION-FORM>. The selection of participants and the confirmation of the session will be announced mid-June. Best regards, MISS-ABMS organization team

March 4, 2025

Converting global coordinates from a mouse event

by Mikael Svane

I have a presenter that is a subclass of SpPresenterWithModel and it contains, among other things, an ImagePresenter with an autoscaling image (a Form). I want to capture mouse clicks on the image and get the coordinate of the click relative to the upper left corner of the Form. My #initializePresenter method looks like this: initializePresenter image := self newImage image: self emptyImage; autoScale: true. image eventHandler whenMouseDownDo: [ :event | self handleMouseDown: event]. This works, and the #handleMouseDown: method is run whenever the mouse is pressed on the ImagePresenter, but the MouseButtonEvent reports global coordinates and I can't find out how to convert these to coordinates relative to the Form that the ImagePresenter holds. I have googled and found answers to similar old questions, but nothing that seems to apply to Spec2. There must be a very simple solution to this, it's just that I can't seem to find it. Kind regards, Mikael

March 2, 2025