I started that book but couldn't find time to continue :). This game is almost finished and my aim was to make something fast, so I will release it this way but if it attratcs attention I plan to work on new version after I read that book :)
Thanks. On Apr 7, 5:22 pm, Adam Ratana <[email protected]> wrote: > What you're trying to do is a common operation for graphics/games. If > you're doing a game, I would suggest just doing this in openGL - you would > create a texture altas out of 1 large bitmap (say 1024x1024), with your > individual textures (or frames of a sprite) all packed in. Then you can > map from a part of that bitmap to a part of the surface you're drawing to, > by specifying vertices. You could then, instead of rotating the entire > surface, just translate and rotate the destination vertices. > > Some resources that help with this will be libgdx (open source graphics > engine for Android) created by the author of Beginning Android Games, a > book which was very helpful in explaining these things to me when I wanted > to do something similar. > > > > > > > > On Friday, April 6, 2012 9:07:53 PM UTC-4, elix wrote: > > > Hi > > > I was trying to find an appropriate way to draw a portion of a bitmap > > rotated onto the canvas. > > > Rotating canvas does not seem appropriate for my situation; I am working > > on a game, there will be up to 30 soldiers on the screen. Rotating the > > whole canvas seperately for each of them does not seem nice. > > I can't apply rotation to a matrix and use it in canvas.drawBitmap(source, > > matrix, paint) method. It works for the whole bitmap. I need to draw only a > > portion of bitmap at each frame. I am using sprite animation. > > > Somethings could be done using Bitmap.createBitmap(...) method but making > > bitmap creations continuously at each frame isn't nice. While writing these > > something came to my mind :), may be I could divide the frames into > > different bitmap objects at initialization phase using this createBitmap > > method, then apply rotation to these bitmaps using matrix. > > > Anyway, I will try this but I would be glad to hear better approaches. > > > -- > > > Emre -- 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
