Scratch

shadow_7283 wrote:

*bump*

I'm sorry, what are you bumping?  I think I've answered everything you've posted here.  (In one case I answered with "I don't understand" and am awaiting clarification.)

bharvey wrote:

shadow_7283 wrote:

*bump*

I'm sorry, what are you bumping?  I think I've answered everything you've posted here.  (In one case I answered with "I don't understand" and am awaiting clarification.)

I think he just likes seeing this topic near the top of the list. It's sort of comforting.

@bharvey&jens

For Scratch and Byob sin 1 = 0.017452 and sin pi/4 = 0.027492
sin 1 computed with the formula 1 -1/3! +1/5! -1/7! gives 0.84147, the same number is given by Excel.

The same formula used  to calculate sin pi/4 gives 1and Scratch 0.27492
Which is the explanation ?

xly wrote:

@bharvey&jens

For Scratch and Byob sin 1 = 0.017452 and sin pi/4 = 0.027492
sin 1 computed with the formula 1 -1/3! +1/5! -1/7! gives 0.84147, the same number is given by Excel.

Scratch's angles are in degrees, not radians.

Scratchers!

How would one create/destroy sprites dynamically, i.e. under program control?  Is this possible in scratch?

Thanks
db

xly wrote:

It's obvious Mr Watson !!

To be exact :

"Excellent! I cried. "Elementary," said he. (#1)
Sherlock Holmes never said "Elementary, my dear Watson" in any of the stories by Conan Doyle. However, that phrase has been used frequently in the movies and was even mistakenly cited in Bartlett's Familiar Quotations for 1937 and 1948. The actual quotation is as follows etc

Concerning Variables defined in a "Script variables" block, they need to be initialized , elementary for variables defined as numbers, but not obvious for variables defining lists which need generally to be defined as a void list with : SET result to LIST [void] It took me a long time to learn this : I had a block always mis-returning 0 instead of the expected report list.

Thanks for the quick reply BBM.....

Hmmmm per chance does Slash have these capabilities?  Just clicked on your link, and saw a clone block!!!!  How should "meta" capabilities be classified, as control? Or should there be a new class of ops?

Now, I have another question (OK actually a LOT of questions! But I'll ask just one this time).   There seems to be a growing number of Scratches. Is there a family photo album some where so I can check out and compare the Scratch family tree?


Thanks,

db

=========
Being as technically social as possible. After all, Being "Social" is BIG these days. [And  just how old are the internet newsgroups?]

DrBranes wrote:

Now, I have another question (OK actually a LOT of questions! But I'll ask just one this time).   There seems to be a growing number of Scratches. Is there a family photo album some where so I can check out and compare the Scratch family tree?

Yes, there is a website that has most of the Scratch mods on it, here.

  If only Scratch got updated this often... 

Getting the new version of BYOB! 

EDIT: Hey, I just noticed - the Gobo is at X position 1 and Y position -1 - shouldn't it be X position 0 and Y position 0?

Last edited by Jonathanpb (2010-09-02 01:11:43)

DrBranes wrote:

Anybody thinking along commercial app line in the scratch world(s)?

Yes, it says here that the Panther gang are working on programming a (commercial) chip in a Scratch-like notation.

bharvey wrote:

Jonathanpb wrote:

the Gobo is at X position 1 and Y position -1 - shouldn't it be X position 0 and Y position 0?

Yup.  Filing a bug.

What bug?

Jonathanpb wrote:

EDIT: Hey, I just noticed - the Gobo is at X position 1 and Y position -1 - shouldn't it be X position 0 and Y position 0?

I've always thought that was weird, but doesn't it happen with most mods? I think the vanilla source code has the non-scratch cat at (1,1) as the default sprite. Maybe the Scratch team think they have exclusive rights to the point (0,0) 

rubiks_cube_guy238 wrote:

Can you add dictionaries to 3.1? I mean, sure, it would be easy to make a block that reports a dictionary object, but it would be nice to have something faster and which you can display on the stage.

Our general policy is to add the features you need to build what you want, rather than to add what you want.  Given lists of lists, you can make associative lists -- there's a project by fullmoon on the byob web site.

What you need for full hash tables is a way to turn text into numbers, and we provided that with the char-to-ASCII block.  And you need list code to be blindingly fast, which we're working on.

As for displaying on the stage, you make a case for exposing more of the underlying Morphic to the BYOB user (not counting Elements, which exposes the entire Smalltalk code base -- maybe more than you want) if we could think of a good easy-to-use way to do that.  I'd rather than than build in a special case.