[plt-scheme] scaling and rotating images using image.ss

I'll be very interested in reading the approach to testability.  I'm also
curious about how one effectively tests the rendering functions --- it's
really not obvious to me what if anything one can do there.

y

On Sat, Sep 26, 2009 at 10:01 AM, Matthias Felleisen
<matthias at ccs.neu.edu>wrote:

>
> We are not ideologues:
>
>  ;; random: Nat -> Nat
>  ;; (random n) is an element of [0,n)
>
> See
> http://www.ccs.neu.edu/home/matthias/HtDP2e/Itemizations_and_Structures.html,
> look for random. But yes, this is the only compromise so far.
>
> The November release will contain forms (and recommendations) for testing
> functions that employ random.
>
>
>
>
>
>
> On Sep 26, 2009, at 9:56 AM, Yaron Minsky wrote:
>
> Argh.  I was still running 4.1 by mistake.  It's right there in plain sight
> in 4.2.1.
>
> Another question about the world/universe approach: how do you guys think
> about randomness?  I've found that adding a bit of randomness can make games
> considerably more compelling.  But it's not clear how to include randomness
> in a reasonably simple way that doesn't compromise on the purely-functional
> nature of the callbacks...
>
> y
>
> On Sat, Sep 26, 2009 at 9:49 AM, Matthias Felleisen <matthias at ccs.neu.edu>wrote:
>
>>
>> On Sep 26, 2009, at 9:43 AM, Yaron Minsky wrote:
>>
>> Nice to see everyone up so early on a Saturday morning!
>>
>>
>> You're late :-]
>>
>>
>> Where is 2htdp/universe?  I just installed the latest PLT scheme release,
>> and I don't see anything called "universe" in the list of teachpacks that
>> comes up when I try to add a teachpack.
>>
>>
>>
>> Use the scrollbar. It's there.
>>
>>
>>
>>
>> Anyway, I'm glad to see this getting worked on.  I think one of the things
>> that Scratch got right is that it provides simple image transformations,
>> which turn out to be very useful in constructing simple-yet-compelling
>> games.  I think having more of this stuff for drscheme will make it
>> considerably more compelling for the younguns.
>>
>> y
>>
>> On Sat, Sep 26, 2009 at 9:29 AM, Matthias Felleisen <matthias at ccs.neu.edu
>> > wrote:
>>
>>>
>>>
>>> 1. htdp/world is deprecated, use 2htdp/universe instead.
>>>
>>> 2. we consider the pinhole approach to our image library as a mistake. To
>>> solve the problem Robby is working on 2htdp/image, a replacement for the
>>> image library. When it comes out (end of semester probably) it will support
>>> rotate and other such operations, plus comparisons will be much faster.
>>>
>>> -- Matthias
>>>
>>>
>>>
>>>
>>>
>>> On Sep 26, 2009, at 9:17 AM, Yaron Minsky wrote:
>>>
>>>  I'm playing around with the image.ss and world.ss teachpacks, and I
>>>> couldn't figure out how to scale and rotate images.  Are there such image
>>>> transformation functions in some other teachpack?
>>>>
>>>> y
>>>>  _________________________________________________
>>>>  For list-related administrative tasks:
>>>>  http://list.cs.brown.edu/mailman/listinfo/plt-scheme
>>>>
>>>
>>>
>>
>>
>
>
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