[plt-scheme] 2htdp/image: above and friends

You mean you want a language-specific library somehow? Or multiple libraries?

Robby

On Sat, May 8, 2010 at 7:50 PM, Matthias Felleisen <matthias at ccs.neu.edu> wrote:
>
> i.e., meaning in BSL/+ they should be like + and in ISL too.
>
>
> On May 8, 2010, at 1:26 PM, David Van Horn wrote:
>
>> I'd like to suggest that above and friends from the 2htdp/image library change from:
>>
>> (above i1 i2 is ...) -> image?
>>  i1 : image?
>>  i2 : image?
>>  is : image?
>>
>> to:
>>
>> (above is ...) -> image?
>>  is : image?
>>
>> This is consistent with ISL's +, and it's important for the analogy between numbers and images that the operations remain consistent.
>>
>> Also, above (as is) and apply won't work together, which I think was one reason for ISL moving to its current + contract.
>>
>> The new function would obey:
>>
>> (equal? (above i) i)
>> (equal? (above) (circle 0 'solid 'red))
>>
>> [Maybe an empty-image binding for that latter value should be in included in the library?]
>>
>> David
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