The problem is now solve with the 5.1.1 version of Racket. (for floats) I can rotate a bitmap% around the (0,0) coordinate point, but I cannot do the same for any other point.. I tried to use a bitmap-dc for rotate the bitmap, and draw this bitmap-dc on a canvas with a dc and method "draw-bitmap", but the 3/4 of the image is cut.. I've seen you used gl2d library for rotate your images.. Should I do the same ? (when I try to run a code with gl2d code, my DrRacket closes immediatly.. what's the problem ?) Thanks
Jyu. > Date: Tue, 3 May 2011 14:40:54 -0600 > Subject: Re: [racket] Racket/gui : How to rotate a bitmap% ? > From: [email protected] > To: [email protected] > CC: [email protected] > > [Please reply-all.] > > I forget when racket/draw was introduced, I think with the graphical > rewrite. I've never seen the float problem you mention. > > Did you using "rotate" on the dc solve your problem? > > Jay > > 2011年5月3日13:43 Jyu 。 <[email protected]>: > > Thanks for response, I'm not use 2htdp/image, because I don't want to have > > problem with bounding boxes.. > > I draw with a dc directly in with draw-bitmap yes. > > Is racket/draw only available on Racket 5.1 ? Because I have problems with > > floats with Racket 5.1 on ubuntu... > > For example, if I write "(printf "~a" 0.8)" on the top level, this return > > "0.0" > > It's very problematic for Chipmunk.. > > > >> Date: Mon, 2 May 2011 15:53:00 -0600 > >> Subject: Re: [racket] Racket/gui : How to rotate a bitmap% ? > >> From: [email protected] > >> To: [email protected] > >> CC: [email protected] > >> > >> If you are using 2htdp/image, you can use 'rotate' > >> > >> > >> http://pre.racket-lang.org/docs/html/teachpack/2htdpimage.html#(def._((lib._2htdp/image..rkt)._rotate)) > >> > >> If you are using a dc directly with draw-bitmap, you can use a > >> different 'rotate' > >> > >> > >> http://pre.racket-lang.org/docs/html/draw/dc___.html?q=draw-bitmap#(meth._(((lib._racket/draw..rkt)._dc~3c~25~3e)._rotate)) > >> > >> How are you drawing? > >> > >> Jay > >> > >> 2011年5月2日15:30 Jyu 。 <[email protected]>: > >> > Hi ! > >> > For a school project who use the chipmunk 2D physics library, I need to > >> > rotate an image (instance of bitmap%).. > >> > I searched for a long time but I have not found, someone know how can I > >> > do > >> > this ? > >> > Thanks. > >> > _________________________________________________ > >> > For list-related administrative tasks: > >> > http://lists.racket-lang.org/listinfo/users > >> > > >> > >> > >> > >> -- > >> Jay McCarthy <[email protected]> > >> Assistant Professor / Brigham Young University > >> http://faculty.cs.byu.edu/~jay > >> > >> "The glory of God is Intelligence" - D&C 93 > > > > > > -- > Jay McCarthy <[email protected]> > Assistant Professor / Brigham Young University > http://faculty.cs.byu.edu/~jay > > "The glory of God is Intelligence" - D&C 93
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