Canvas does zooming, scaling, rotation, translation etc. via stackable transformations see: http://developer.android.com/reference/android/graphics/Canvas.html and look for functions like:
save restore scale translate setMatrix etc... On Sunday, August 12, 2012 9:44:47 AM UTC+1, Simon Giddings wrote: > > Thank you to every one for their responses. > > It would seem, however, that my question was not clear enough (you are > right James). > > I am going to write a music notation app. > So, will "simply" be writing the music score on the display - no animation > needed. > My question was about visual scaling - reproducing a "sheet of music > paper" and then permitting the user to zoom in and out. > Hence the reference to world coordinate and screen coordinate conversions. > > Please note - this will *not* be using pdf documents ! > > Can I still achieve this with Canvas ? > Is there an example of the correct way of producing this kind of scaling > when using Canvas ? > I will be targeting tablet systems with this. > > > On Sunday, 12 August 2012 06:15:06 UTC+2, Dianne Hackborn wrote: >> >> On Sat, Aug 11, 2012 at 2:50 PM, James Black <[email protected]> wrote: >> >>> Do you need a fast refresh rate for example? One music program I wrote >>> had to turn notes on and off at the correct millisecond, under windows; >>> that accuracy won't work on mobile devices. >>> >> You can do 60fps drawing with either OpenGL or Canvas. That is the best >> you are going to get for accuracy since that is the screen refresh rate. >> >> -- >> Dianne Hackborn >> Android framework engineer >> [email protected] >> >> Note: please don't send private questions to me, as I don't have time to >> provide private support, and so won't reply to such e-mails. All such >> questions should be posted on public forums, where I and others can see and >> answer them. >> >> -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
