Hi KK Subbu,

I own that book and luckily I red already that chapter. Anyhow it was a good recommendation;)

I am aware of the `step` method, that is not really what I want in this case. I am preparing a video tutorial, I need changes to be slow and the user to be able to modify stuff. Something feeling like Etoys, but in Smalltalk.

I discovered by accident that what i wanted is not difficult to achieve running this: ----------- for some reason it works ------------------- 1 to: 10 do: [:x |      e forward: 10.      Transcript show: ('[{1} -- hello]' format: {x}); cr.      (Delay forMilliseconds: 500) wait.          ]. --------------------------------------------------------

Then after your suggestion I went to review that chapter in search for inspirations. And I remembered the `World` is just a `PasteUpMorph`, so I started to dig into the class and I found this method which I already read about somewhere else, probably "the white book": `doOneCycleNow` -------- working, reasonable, easy to read -------------- 1 to: 20 do: [:x |      e forward: 10.      World doOneCycleNow.      (Delay forMilliseconds: 200) wait.          ]. ---------------------------------------------------------

Then I wrote this, but i don't think i will use it because it starts to be difficult to understand for new users. ----- better looping to not starve UI -------------- [1 to: 10 do: [:x |      e forward: 10.      World doOneCycleNow.      (Delay forMilliseconds: 500) wait.       ] ] fork. -----------------------------------------------------

If you have other recommendations for improvement let me know.

bye Nicola

On 10/23/19 10:46 PM, K K Subbu wrote:

Nicola,

Morphic updates to Display are buffered, so you can't animate them through delays. Morphic core already has built-in facilities to support animation in an efficient way. There is an excellent tutorial by John Maloney at:

http://sdmeta.gforge.inria.fr/FreeBooks/CollectiveNBlueBook/morphic.final.pd...

See the section on "Adding Liveness" (page 11) for the specifics.

HTH .. Subbu

On 24/10/19 5:03 AM, Nicola Mingotti wrote:

...

Hi,

I would like a Morph to move and then wait a bit, move and wait a bit ... and so on. I can't get it.

For example, this code works as expected:

1 to: 10 do: [:x |      Transcript show: ('[{1} -- hello]' format: {x}); cr.      (Delay forMilliseconds: 500) wait.      ].

---

But once i try to put the Delay between a Morph changes it does not do what i want. That is, the morph does all the actions together at the end of the loop.

---

e := PolygonMorph new. e openInWorld. e position: 300@300. e heading. e forward: 50.

1 to: 10 do: [:x |      e forward: 10.      (Delay forMilliseconds: 500) wait.      ].

---

bye Nicola

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