There are some in ApiDemo samples. The Canvas functions work very much like OpenGL ES 1.0 in that you set up your transformations and then Paint/Draw on the Canvas.
On Sunday, August 12, 2012 12:59:12 PM UTC+1, Simon Giddings wrote: > > Thank you Richard, > > I tried to find examples, without success. > Do you know of any ? > > On Sunday, 12 August 2012 10:49:10 UTC+2, RichardC wrote: >> >> 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
