mag653@csc.anu.oz (11/16/89)
I am trying to rotate text within a window. As mentioned in TN41, I am using an offscreen bitmap. However, I am having troble rotating the bitmap itself. I have used the brute force approach in tranposing bit by bit into a new bitmap, But this seems very unreasonable. Can anyone please suggest a cleaner way of doing this. Many thanks. Martin Grant mag653@csc.anu.oz
oster@dewey.soe.berkeley.edu (David Phillip Oster) (11/17/89)
There was a great MacTutor article on running TextEdit() with 90 and 180 degree rotations. the basic idea is: divide the bitmap into 8x8 pixel rectangles, then use a tuned assembly language routine to rotate the rectangles, then use CopyBits() (or a tuned loop) to copy each 8x8 rectangle to its destination. There are some boundary conditions to watch out for, but you can definately rotate a 256x256 area many times a second.
houpt@husc8.HARVARD.EDU (Thomas Houpt) (01/17/90)
I may have missed something somewhere, but how do you rotate text under Quickdraw? I just want to write characters along a vertical baseline. All the other graphic interfaces I've worked with allowed you to specify a baseline for text to be drawn along. I know it can be done, since lots of applications support rotating text. My planned hack is to draw the text to an off-screen bit-map, then rotate the pixels "by hand" before copying them to the screen. Is there a more elegant solution (aside from (I hope) system 7?). Tom Houpt houpt@husc8.harvard.edu
stevem@hpvcfs1.HP.COM (Steve Miller) (01/19/90)
> Is there a more elegant solution [to rotate text]
Nope.
Steven Milleroster@dewey.soe.berkeley.edu (David Phillip Oster) (01/19/90)
In article <1274@husc6.harvard.edu> houpt@husc8.UUCP (Thomas Houpt) writes: > My planned hack is to draw the text to an off-screen bit-map, then > rotate the pixels "by hand" before copying them to the screen. > Is there a more elegant solution (aside from (I hope) system 7?). Nope, you've got the right way to do it under the current and past system software. There was an article in MacTutor magazine that gave source code for this (It showed TextEdit remapped to do all 4 90 degree rotations, simultaneously.) I think it was last year. Great article. --- David Phillip Oster -- No, I come from Boston. I just work Arpa: oster@dewey.soe.berkeley.edu -- in cyberspace. Uucp: {uwvax,decvax}!ucbvax!oster%dewey.soe.berkeley.edu
gillies@p.cs.uiuc.edu (01/22/90)
I think it's kind of surprising that Quickdraw doesn't have a RotateCopyBits call, not even for just 90, 180, and 270 degrees rotations. This is an oversight of mammoth proportion. Does anyone know why?
casseres@apple.com (David Casseres) (01/23/90)
In article <104700070@p.cs.uiuc.edu> gillies@p.cs.uiuc.edu writes: > I think it's kind of surprising that Quickdraw doesn't have a > RotateCopyBits call, not even for just 90, 180, and 270 degrees > rotations. This is an oversight of mammoth proportion. Does anyone > know why? Not an oversight, really. It's for the same reason a lot of programming languages don't have an exponentiation operator built in: there are a number of ways to do the job, but which one is best depends on the circumstances. Doing simple rotations is rather easy in assembly language, but how you optimize depends heavily on things like the exact dimensions of your bitmap. In general, note that QuickDraw provides a rather complete set of bitmap _transfer_ facilities (i.e. all the different transfer modes) but essentially no bitmap _processing_ facilities other than simple pack and unpack operations. David Casseres Exclaimer: Hey!
cecala@m2.csc.ti.com (Tony Cecala) (01/25/90)
A friend of mine is doing perceptual experiments with her Mac. We've got Scrapbook bitmaps going on the screen and subjects make decisions about these PICTs. We need to rotate these and would like pointers to some CODE, preferably in Pascal. The rotations need to be done in an OffScreen bitmap and then blasted onto the screen with CopyBits (this is a reaction time study). Any help would be very much appreciated. If you wish to respond directly, please send to: 2459***@prime.acc.virginia.edu Tony Cecala User Interface Designer | 2414 Spring Meadow Dr., Mesquite, TX 75150 Texas Instruments, Inc. | Arpanet: cecala@m2.csc.ti.com *I speak for me only* | AppleLink: VIA.applelink.apple.com
timm@yoyodyne.ncsa.uiuc.edu (Tim McClarren) (06/12/91)
I'm sorry to do this...I know this was just discussed a couple months ago, but I now have need to rotate text...could someone please e-mail me references to the solutions that were discussed on the net (or code if you have it?). Thanks much. Tim