Ken, Did you try setting acceleratedRendering to true and then setting the layerMode property of the image to "dynamic"? Might make a difference. Kind of guessing, though.
Chris On Jan 23, 2012, at 4:02 PM, Ken Corey wrote: > Hiya Thomas, > > I've been meaning to take a stab at this, and your post got me off my duff. > > I've seen a few apps that do multitouch pinch to zoom *really* well. by that > I mean that the pinch can accomplish 3 things at the same time: > scale something > rotate something > move something > > The last one makes it feel really slick. Of course, if you only wanted to do > one of those, no problem. > > I wanted to build and API with 3 main calls: > pinchStart > pinchMove dDistance, dAngle, dX, dY > pinchEnd > > Start and End are for setup/cleanup, and pinchMove is where the work is done. > > I've created a sample script to demonstrate the concept: > > http://its.ec/static/multitouchtest.livecode.zip > (I packaged it up this way because there is a image involved.) > > This "works" on my iPad. Jerky, but it works. > > On my Nexus One, the app is less impressive. Things can move, but when you > try to rotate, the rotation is not uniform. Sometimes it rotates, sometimes > it doesn't, sometimes it goes backwards. *shrug* > > It is possible to build a test harness for a desktop in just a few lines of > code, but in this case I pulled them out for brevity. That means that if > you've got an iPad it will work fairly well. My PC nor my Mac have > multi-touch built in, so I don't know how they'd do. > > As always, there're flies in this particular ointment: > > 1) Images can't scale and rotate at the same time. In my demo, the image will > rotate and move, but only when the angle of the image is zero will it > scale...this will appear as "pop" of a larger image. > > A horrible work-around could be to use your main image as a template. Clone > it, scale that, take a snapshot of it at the zoomed size and /then/ rotate > that. Ugh. Any better way to skin this one? > > 2) Graphics can't be rotated natively. I found that only some graphics even > report their points (rectangles, rounded rects, ovals, etc don't...so you > can't rotate them). > > The horrible hacky way around that might be to try to implement the regular > polygons using a Polygon, or even a "Freehand Polygon". Maybe. > > Then, you could implement a rotation routine for such a Frankenstein poly. > Blech. > > 3) It's jumpy, big time. Worse come to worse, you could try to build-in an > averaging function, but I was quite surprised how jumpy it all is. > > 4) Not sure about the Android support. > > 5) Not even sure where'd you'd use this kind of thing because of uneven > support. Can't use scaling with images. Can't use rotation with graphics. > Both are painfully jerky. > > I'm quite a LiveCode newbie, so if anyone has constructive feedback on my > code, or knows a more-runrev kinda way to do things I'd appreciate if you'd > let me (or the list) know. > > Thanks, > > -Ken > > _______________________________________________ > use-livecode mailing list > use-livecode@lists.runrev.com > Please visit this url to subscribe, unsubscribe and manage your subscription > preferences: > http://lists.runrev.com/mailman/listinfo/use-livecode _______________________________________________ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
