[Cuis-dev] VectorGraphics and Morph

[Juan Vuletich]

Hi Hilaire,

Several days ago I told I'd be working on a replacement for that 
VectorGraphicsPasteUpMorph hack I'd done.

I have some experimental stuff working. The strategy is to use a 
subclass of BitBltCanvas called HybridCanvas, that holds a VectorCanvas 
in an instance variable. This means that vector graphics morphs can be 
added to the world just like regular morphs. I had to do many changes to 
the way that damage regions are handled, etc. It is kind of working, but 
not without some hiccups, and maybe I'd change things again. So, this is 
not yet ready for integration.

The code is attached. To test this you'll need a bit of patience. It 
includes 25 files! Also, it works reasonably well (without a 
VectorGraphics plugin!) in a rather fast machine. A slow machine might 
make it unusable. The procedure is:
- Pull repos
- Start Cuis. Don’t use an image you care about!
- Install Updates
- Feature require: 'VectorGraphics'
- Open FileList on VGExperiments. Sort by name. Install each of the 25 
files, in name order.
- Close all windows.
- Open a Workspace.
- evaluate each of the following lines
self runningWorld setCanvas: (HybridCanvas onForm: Display). "set hybrid 
canvas"
self runningWorld canvas class.    "validate canvas updated"

a _ EllipseMorph2 new openInWorld.
b _ EllipseMorph3 new.
c _ EllipseMorph4 new.
a addMorph: b.
b morphPosition: 100 at 0.
a addMorph: c.
c morphPosition: -100 at 0.

Then you can do stuff like
c stopStepping
c startStepping

Try the halo grow handle, etc.

Browse a bit the new EllipseMorph classes. These new classes _only_ now 
how to draw themselves. They don't include #morphContainsPoint: or 
#morphBoundsInWorld logic at all. Also check that the moment you modify 
the #drawOn: method, everything works as expected. The idea is to make 
writing new morphs as simple as possible, with the framework handling 
the complex parts.

I plan to keep working on this, until it is mature enough for 
integration in Cuis.

Thanks,

On 7/8/2020 10:42 AM, Juan Vuletich via Cuis-dev wrote:
> On 7/4/2020 5:46 PM, Hilaire Fernandes via Cuis-dev wrote:
>> 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
>
> Hi Hilaire,
>
> The first thing to mention is that PolygonMorph should not inherit 
> from RectangleLikeMorph. PolygonMorph is more like M3Exp01Morph, 
> M3Exp02Morph and M3Exp03Morph. But these also don't work well yet. 
> Damage areas are not reported correctly and morphContainsPoint: 
> doesn't work either.
>
> The VectorGraphicsPasteUpMorph was just a hack to let you play with 
> vector graphics drawing, but I guess it is time to clean it up, make 
> it usable, and integrate it. Then it will make sense to start building 
> things like PolygonMorph in a clean style.
>
> Please give me a few days to work on this.
>
> Cheers,
> -- 
> Juan Vuletich
> www.cuis-smalltalk.org
> https://github.com/Cuis-Smalltalk/Cuis-Smalltalk-Dev
> https://github.com/jvuletich
> https://www.linkedin.com/in/juan-vuletich-75611b3
> @JuanVuletich


-- 
Juan Vuletich
www.cuis-smalltalk.org
https://github.com/Cuis-Smalltalk/Cuis-Smalltalk-Dev
https://github.com/jvuletich
https://www.linkedin.com/in/juan-vuletich-75611b3
@JuanVuletich

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