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Canvas Transform Goes Haywire if Scaled

by Sean P. DeNigris

The following works as I expect: morph := Morph new topLeft: 200@400; openInWorld. outputRect := morph fullBounds. canvas := Display defaultCanvasClass extent: outputRect extent depth: Display depth. scale := 1. t := MorphicTransform offset: outputRect topLeft angle: 0 scale: scale. clipRect := outputRect translateBy: outputRect topLeft negated. canvas transformBy: t clippingTo: clipRect during: [ :aCanvas | aCanvas fullDrawMorph: morph ]. canvas form asMorph openInWindow. "morph delete." but if I change scale even a little bit (e.g. 0.95), things quickly go south. Check out scale = 1 vs scale = 0.95 below: <http://forum.world.st/file/n4803830/Screenshot_2015-02-05_00.png> Obviously they differ by more than I expected. If I change scale to 0.5, the morph disappears from view in the canvas completely. I had both translation and scale working in a spike by translating with FormCanvas>>#translateBy:during: and then magifying with "canvas form magnifyBy: 0.5", but I want to do this in my morph's drawing method, so I want to do both with the canvas. Where am I going wrong here? ----- Cheers, Sean -- View this message in context: http://forum.world.st/Canvas-Transform-Goes-Haywire-if-Scaled-tp4803830.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

Feb. 5, 2015

Re: [Pharo-users] Question on Morphic drawOn: method.

by Sean P. DeNigris

nacho wrote > I'm so lost in morphic. > Trying to understand the logic of it slowly. > Unfortunately there seems to be little documentation and a lot of what is > there does not work in Pharo 3 or 4. I use Pharo By Example for most straightforward Morphic questions. It shows the nuts-and-bolts very clearly and I haven't found it out of date through Pharo 3.0. For the principles behind Morphic to really grok how magical it could be, the original Self Morphic papers can't be beat. HTH ----- Cheers, Sean -- View this message in context: http://forum.world.st/Question-on-Morphic-drawOn-method-tp4803695p4803772.h… Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

Feb. 4, 2015

Re: [Pharo-users] Question on Morphic drawOn: method.

by nacho

Great! Thanks. It works perfectly in Pharo 3 but not in Pharo 4. I thought that the drawOn: aCanvas was mandatory. I'm so lost in morphic. Trying to understand the logic of it slowly. Unfortunately there seems to be little documentation and a lot of what is there does not work in Pharo 3 or 4. Thanks again for taking the time! Best Nacho *Lic. Ignacio Sniechowski, MBA* *Prosavic SRL* *Tel: (011) 4542-6714* On Wed, Feb 4, 2015 at 5:30 PM, Sean P. DeNigris [via Smalltalk] < ml-node+s1294792n4803743h26(a)n4.nabble.com> wrote: > HilaireFernandes wrote > First you don't need to subclass EllipseMorph... > 100 to: 50 by: -1 do: [ :x | > aBall > height: x; > bottom: 200 - x. > World doOneCycle] > > Of course you can have the best of both worlds by using Morphic stepping > in your subclass, like: > > EllipseMorph subclass: #Ball > ... > Ball>>#step > self > bottom: 200 - self nextHeight; > height: self nextHeight. > > self bottom = 100 ifTrue: [ increment := -1 ]. > self bottom = 150 ifTrue: [ increment := 1 ]. > > For full code: > Gofer it > smalltalkhubUser: 'SeanDeNigris' project: 'SeansPlayground'; > package: 'Ball'; > load. > Cheers, > Sean > > > ------------------------------ > If you reply to this email, your message will be added to the discussion > below: > > http://forum.world.st/Question-on-Morphic-drawOn-method-tp4803695p4803743.h… > To unsubscribe from Question on Morphic drawOn: method., click here > <http://forum.world.st/template/NamlServlet.jtp?macro=unsubscribe_by_code&no…> > . > NAML > <http://forum.world.st/template/NamlServlet.jtp?macro=macro_viewer&id=instan…> > ----- Nacho Smalltalker apprentice. Buenos Aires, Argentina. -- View this message in context: http://forum.world.st/Question-on-Morphic-drawOn-method-tp4803695p4803749.h… Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

Feb. 4, 2015

Re: [Pharo-users] Supply named temporaries to Compiler>>#evaluate:...

by Nicolai Hess

2015-02-04 18:48 GMT+01:00 Sean P. DeNigris <sean(a)clipperadams.com>: > I want to be able to evaluate a string like '2 + arg1' and supply anObject > for arg1 to the compiler. > > I naively tried: > | aContext | > aContext := thisContext copy > tempNamed: 'arg1' put: 1; > yourself. > Compiler evaluate: '2 + arg1' in: aContext to: nil > > which didn't even come close to working! > > Any pointers? > a workaround: http://forum.world.st/How-can-I-specify-the-bindings-when-evaluating-an-exp… > > > > ----- > Cheers, > Sean > -- > View this message in context: > http://forum.world.st/Supply-named-temporaries-to-Compiler-evaluate-tp48036… > Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. > >

Feb. 4, 2015

Re: [Pharo-users] Question on Morphic drawOn: method.

by Sean P. DeNigris

HilaireFernandes wrote > First you don't need to subclass EllipseMorph... > 100 to: 50 by: -1 do: [ :x | > aBall > height: x; > bottom: 200 - x. > World doOneCycle] Of course you can have the best of both worlds by using Morphic stepping in your subclass, like: EllipseMorph subclass: #Ball ... Ball>>#step self bottom: 200 - self nextHeight; height: self nextHeight. self bottom = 100 ifTrue: [ increment := -1 ]. self bottom = 150 ifTrue: [ increment := 1 ]. For full code: Gofer it smalltalkhubUser: 'SeanDeNigris' project: 'SeansPlayground'; package: 'Ball'; load. ----- Cheers, Sean -- View this message in context: http://forum.world.st/Question-on-Morphic-drawOn-method-tp4803695p4803743.h… Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

Feb. 4, 2015

Re: [Pharo-users] Question on Morphic drawOn: method.

by kilon alios

alt+shift+left click should bring on the halo , the claw like icon has a menu with the debuger as an entry you can trigger to see whats wrong. You can also inspect the morph too and play around with it, very useful even when you got no errors. On Wed, Feb 4, 2015 at 9:33 PM, nacho <0800nacho(a)gmail.com> wrote: > Thank you both of you! > I will continue with my Morphic explorations.... > > Nacho > > > > ----- > Nacho > Smalltalker apprentice. > Buenos Aires, Argentina. > -- > View this message in context: > http://forum.world.st/Question-on-Morphic-drawOn-method-tp4803695p4803734.h… > Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. > >

Feb. 4, 2015

Re: [Pharo-users] Question on Morphic drawOn: method.

by nacho

Thank you both of you! I will continue with my Morphic explorations.... Nacho ----- Nacho Smalltalker apprentice. Buenos Aires, Argentina. -- View this message in context: http://forum.world.st/Question-on-Morphic-drawOn-method-tp4803695p4803734.h… Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

Feb. 4, 2015

Re: [Pharo-users] Question on Morphic drawOn: method.

by Hilaire

Hello Nacho, It is even simpler as you seems to imagine. First you don't need to subclass EllipseMorph if all you want is a ball, then you don't need the position attribute, Morph always knows about positionning. Then, the #drawOn: method is to do the drawing, you don't need to subclass as long as you don't need a different drawing. Color, border should be set elsewhere. The redbox with the cross appears in a Morph area when its drawing gets wrong, here your override in drawOn: For inspiration you can copy and paste the code example bellow; as you mentioned animation, it shows you a few tips on that matter. Good exploration Hilaire | aBall | aBall := EllipseMorph new. aBall borderWidth: 10; borderColor: Color green; color: Color white; extent: 100@100. aBall position: ( 10@100 ). aBall openInWorld. 100 to: 50 by: -1 do: [ :x | aBall height: x; bottom: 200 - x. World doOneCycle] Le 04/02/2015 19:00, nacho a Ã©crit : > Hi, > I have the following question: > I want to draw a bouncing ball. > First thing I do is create a class: > > EllipseMorph subclass: #Ball > instanceVariableNames: 'position' > classVariableNames: '' > category: 'PBE-BouncingBall' > > > Then an initialization method that mostly do a super initialize. > Then the drawOn: > > drawOn: aCanvas > aCanvas borderWidth:10; borderColor: Color green. > > > And finally a position method: > > position: aPoint > super position: aPoint. > > position > ^ position. > > > Finally in a Playground I do: > > | aBall | > > aBall := Ball new. > aBall position: ( 10@10 ). > aBall openInWorld. > > But I get a red box with two crossing yellow lines. > What I'm missing? > > Thanks in advance. > Nacho > > > > > ----- > Nacho > Smalltalker apprentice. > Buenos Aires, Argentina. > -- > View this message in context: http://forum.world.st/Question-on-Morphic-drawOn-method-tp4803695.html > Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. > > -- Dr. Geo - http://drgeo.eu iStoa - http://istoa.drgeo.eu

Feb. 4, 2015

Re: [Pharo-users] Question on Morphic drawOn: method.

by Ricardo Moran

Hi Nacho, The red box with two crossing yellow lines indicates that you made a mistake in the drawOn: method. Whenever that happens, here is a tip that might help you. If you can't easily spot your error, you can debug it by evaluating: aBall drawOn: Display getCanvas. This will bring up the debugger and hopefully give you more information. Best regards, Richo On Wed, Feb 4, 2015 at 3:00 PM, nacho <0800nacho(a)gmail.com> wrote: > Hi, > I have the following question: > I want to draw a bouncing ball. > First thing I do is create a class: > > EllipseMorph subclass: #Ball > instanceVariableNames: 'position' > classVariableNames: '' > category: 'PBE-BouncingBall' > > > Then an initialization method that mostly do a super initialize. > Then the drawOn: > > drawOn: aCanvas > aCanvas borderWidth:10; borderColor: Color green. > > > And finally a position method: > > position: aPoint > super position: aPoint. > > position > ^ position. > > > Finally in a Playground I do: > > | aBall | > > aBall := Ball new. > aBall position: ( 10@10 ). > aBall openInWorld. > > But I get a red box with two crossing yellow lines. > What I'm missing? > > Thanks in advance. > Nacho > > > > > ----- > Nacho > Smalltalker apprentice. > Buenos Aires, Argentina. > -- > View this message in context: > http://forum.world.st/Question-on-Morphic-drawOn-method-tp4803695.html > Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. > >

Feb. 4, 2015

Re: [Pharo-users] Custom DND Drop Action?

by Sean P. DeNigris

Sean P. DeNigris wrote > Maybe it should be moved? Ouch! #acceptDroppingMorph:event: was the message I really wanted, but it was in the 'layout' protocol! That's just mean ;) ----- Cheers, Sean -- View this message in context: http://forum.world.st/Custom-DND-Drop-Action-tp4803667p4803724.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

Feb. 4, 2015