Here’s one way, if you mean a bitmap% object:
#lang racket/base
(provide image->bitmap)
(require racket/class
(only-in racket/draw make-bitmap bitmap-dc%)
(only-in 2htdp/image image-width image-height)
(only-in mrlib/image-core render-image))
(define (image->bitmap image)
(let* ([width (image-width image)]
[height (image-height image)]
[bm (make-bitmap width height)]
[dc (make-object bitmap-dc% bm)])
(send dc clear)
(render-image image dc 0 0)
bm))
On Mar 19, 2015, at 7:05 PM, Robby Findler <ro...@eecs.northwestern.edu> wrote:
> When you say "bitmap" do you mean "bitmap% object"? And if so, why do
> they want to do that? If not, do you mean something else?
>
> Robby
>
>
> On Thu, Mar 19, 2015 at 5:24 PM, Andrew Mauer-Oats <mauero...@gmail.com>
> wrote:
>> Is there a public way to change an image created using the 2htdp/image
>> library into a bitmap?
>>
>> My students are used to those functions and it would be easier for some of
>> them to go and build the GUI they want if they didn't have to change over to
>> explicitly using drawing contexts.
>>
>> I have looked at the source for mrlib/image-core, 2htdp/private/image-more,
>> and 2htdp/image. It looks like no exported functions can change an image to
>> a bitmap.
>>
>> The only thing they want to do is be able to render an image onto a dc.
>> Presumably the render-image function would do that, were it exported.
>>
>> What should I do?
>>
>> Thanks for your help,
>>
>> Andrew Mauer-Oats
>> Mathematics Ph.D.
>> Chicago Public Schools: Whitney Young
>>
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