It seems I can not see my question in the post list, why.... 2009/6/13 James Lai <[email protected]>
> Hi, > > I want to draw more pictures to a canvas of a view when I touch the > screen, such as when a touch event happened, I will draw a number in > the canvas, then a touch event happened again, I want to draw another > number in a different area in the canvas(I need keep the first one I > drawed just now). > so I just draw the numbers in onDraw, and call Invalidate() when touch > event happened. But the problem is when I call invalidate(), I need > draw all the numbers again, it will waste some effort. so I want to > know how to keep the original pic and just add the new part to the > original one.... anyone knows? Thanks. > > P.S. some one said I can use invalidate(x,y,top, bottom) to invalidate > Rect of a canvas, but the problem is I need redraw in area1 and area2, > may be more areas, I can not give a specific area when call invalidate > (x,y,top, bottom) ... --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Android Beginners" 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-beginners?hl=en -~----------~----~----~----~------~----~------~--~---
