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World to Morph Local Co-ordinates

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Sean P. DeNigris

World to Morph Local Co-ordinates

Administrator

I'm sure this must be addressed somewhere, but searching the archives for "morph local point" didn't produce anything helpful…

I have a PasteUpMorph that represents a scaled down world. So when a morph sets its position to e.g. 0@0, I want to set it to the topLeft corner of the pasteUp. I can use align:with:, but I thought some of the following might have some usefulness, but all returned 0@0. None of them have tests...
screen globalPointToLocal: (0@0).
screen localPointToGlobal: (0@0).
screen pointInWorld: (0@0).
screen referencePositionInWorld: (0@0).
screen point: 0@0 from: screen.

Is there an easy built-in way to convert points from World to the bounds of another (assume rectangular) morph?

Thanks.

Cheers,
Sean

Igor Stasenko

Re: World to Morph Local Co-ordinates

On 8 January 2014 19:54, Sean P. DeNigris <[hidden email]> wrote:

I'm sure this must be addressed somewhere, but searching the archives for
"morph local point" didn't produce anything helpful…

I have a PasteUpMorph that represents a scaled down world. So when a morph
sets its position to e.g. 0@0, I want to set it to the topLeft corner of the
pasteUp. I can use align:with:, but I thought some of the following might
have some usefulness, but all returned 0@0. None of them have tests...
screen globalPointToLocal: (0@0).
screen localPointToGlobal: (0@0).
screen pointInWorld: (0@0).
screen referencePositionInWorld: (0@0).
screen point: 0@0 from: screen.

perhaps if you pick some morph, which (sub)chile of some TransformMorph,

you will be able to see the difference.

but for screen/world zero is always zero, because there is no difference between local and global , since its transformation is identity :)

Is there an easy built-in way to convert points from World to the bounds of
another (assume rectangular) morph?

piece of cake, since all morphs use same, global coordinates, simple subtraction works:

localpoint := globalpoint - morph topLeft

Thanks.

-----
Cheers,
Sean
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View this message in context: http://forum.world.st/World-to-Morph-Local-Co-ordinates-tp4735247.html
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Best regards,
Igor Stasenko.

Markus Schlager-2

Re: World to Morph Local Co-ordinates

In reply to this post by Sean P. DeNigris

Maybe this thread gives some pointer:

http://lists.pharo.org/pipermail/pharo-users_lists.pharo.org/2013-September/008493.html

I tend to call this a bug - at least it's not the expected behavior of
embedded morphs IMO.

Markus

Sean P. DeNigris

Re: World to Morph Local Co-ordinates

Administrator

Markus Schlager-2 wrote

http://lists.pharo.org/pipermail/pharo-users_lists.pharo.org/2013-September/008493.html

Interesting thread - thanks!

Cheers,
Sean