There is a quite obscure paint tool, SpookyPaint, that one can experiment
with and use the combination rules.

http://www.languagegame.org:8080/zoo/241

Cheers,
Karl


On Thu, Mar 21, 2019 at 9:14 PM Eliot Miranda <eliot.miranda at gmail.com>
wrote:

>
>
> On Thu, Mar 21, 2019 at 9:22 AM Levente Uzonyi <leves at caesar.elte.hu>
> wrote:
>
>> I haven't tried the code yet, but based on the commit message, this is a
>> great contribution. Perhaps it would be worth to create a complete tool
>> showing the actual results.
>> I think this code belongs to Morphic/MorphicExtras rather than Graphics.
>> Graphics doesn't depend on Morphic, and it shouldn't, but these changes
>> would introduce that dependency.
>>
>
> +1
>
>
>>
>> Levente
>>
>> On Thu, 21 Mar 2019, David T. Lewis wrote:
>>
>> > Hi Maximilian,
>> >
>> > This looks like a good addition. It is small and useful, and it aids
>> > understanding.
>> >
>> > I am not very knowledgeable about the BitBlt rules, so maybe someone
>> > else can look at it also? To me, this looks like a good contribution
>> > for trunk.
>> >
>> > Dave
>> >
>> >
>> > On Wed, Mar 20, 2019 at 12:51:46PM +0000, commits at source.squeak.org
>> wrote:
>> >> A new version of Graphics was added to project The Inbox:
>> >> http://source.squeak.org/inbox/Graphics-ms.407.mcz
>> >>
>> >> ==================== Summary ====================
>> >>
>> >> Name: Graphics-ms.407
>> >> Author: ms
>> >> Time: 20 March 2019, 1:51:42.768596 pm
>> >> UUID: 40a66bd7-815f-43f7-bbd0-31dc8da3a483
>> >> Ancestors: Graphics-mt.406
>> >>
>> >> Adds a preview morph for results of all BitBlt rules.
>> >>
>> >> When first using BitBlt, it wasn't easy to understand the effects of
>> the possible rules on pixel combinating for me.
>> >> I implemented two example methods which preview the effects of rule 0
>> to 41 (these are all, I believe) on quadratic existing forms with colors
>> and 1 bit alpha channel (previewAllBitBltRules uses ToolIcons
>> flag/collection) plus Forms with more alpha values
>> (previewAllBitBltRulesWithAlpha uses ToolIcons flag and a Color red + 0.4
>> alpha preview). They generate a combined morph for all rules applied on
>> these forms (scaled, because icons are small) and opens it in your hand.
>> >> Internally, this morph can be generated for any rule, forms and scale.
>> Rules which throw exceptions are replaced with a fallback form.
>> >>
>> >> =============== Diff against Graphics-mt.406 ===============
>> >>
>> >> Item was added:
>> >> + ----- Method: BitBlt class>>previewAllBitBltRules (in category
>> 'examples') -----
>> >> + previewAllBitBltRules
>> >> +
>> >> +    (self previewBitBltRules: (0 to: 41)
>> >> +            on: ToolIcons flag
>> >> +            and: ToolIcons collection
>> >> +            fallback: ToolIcons exception
>> >> +            scaledTo: 32) openInHand.!
>> >>
>> >> Item was added:
>> >> + ----- Method: BitBlt class>>previewAllBitBltRulesWithAlpha (in
>> category 'examples') -----
>> >> + previewAllBitBltRulesWithAlpha
>> >> +
>> >> +    (self previewBitBltRules: (0 to: 41)
>> >> +            on: ToolIcons flag
>> >> +            and: ((Color red alpha: 0.4) iconOrThumbnailOfSize: 12)
>> >> +            fallback: ToolIcons exception
>> >> +            scaledTo: 32) openInHand.!
>> >>
>> >> Item was added:
>> >> + ----- Method: BitBlt
>> class>>previewBitBltRules:on:and:fallback:scaledTo: (in category
>> 'examples') -----
>> >> + previewBitBltRules: rules on: aForm1 and: aForm2 fallback:
>> fallbackForm scaledTo: aNumberOrPoint
>> >> +    "Returns a combined morph of the result of each rule applied on
>> aForm1 combined with
>> >> +    aForm2 scaled to aNumberOrPoint. If the combination faild with a
>> rule, fallbackForm is
>> >> +    shown instead. The number of each rule is appended at the bottom
>> of each result."
>> >> +
>> >> +    | resultMorph tileExtent |
>> >> +    tileExtent := aNumberOrPoint asPoint.
>> >> +    resultMorph := Morph new
>> >> +            color: Color transparent;
>> >> +            extent: (rules size * tileExtent x)@tileExtent y;
>> >> +            yourself.
>> >> +
>> >> +    rules withIndexDo: [ :rule :index | | form formMorph numberLabel |
>> >> +            form := aForm1 copy.
>> >> +            [aForm2 copy displayOn: form at: 0 at 0 rule: rule]
>> >> +                    on: Exception
>> >> +                    do: [form := fallbackForm].
>> >> +            formMorph := (form scaledToSize: tileExtent) asMorph
>> >> +                    position: (index*tileExtent x)@0;
>> >> +                    yourself.
>> >> +            resultMorph addMorph: formMorph.
>> >> +
>> >> +            numberLabel := rule asString asMorph
>> >> +            center: ((index+0.5)*tileExtent x)@tileExtent y;
>> >> +                    yourself.
>> >> +            resultMorph addMorph: numberLabel].
>> >> +
>> >> +    ^ resultMorph!
>> >>
>> >>
>>
>>
>
> --
> _,,,^..^,,,_
> best, Eliot
>
>
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