blackberry - Do screen transitions when the user clicks on a bitmap -
i working on ebook app need transition screens left right , right left. tried many samples i've found, not successful. how change screen when user clicks on screen left right , right left. basic idea transition of pages. went through developer support forum thread "page-flip effect" looking solution, can't see it.
the following code not logical. in position have implement flip effect flipping pages in screen , how implement it?
public class transitionscreen extends fullscreen implements runnable{ private int angle = 0; bitmap frombmp,tobmp; public transitionscreen(){ } public transitionscreen(animatablescreen from,animatablescreen to) { frombmp = new bitmap(display.getwidth(), display.getheight()); tobmp = new bitmap(display.getwidth(), display.getheight()); graphics fromgraphics = graphics.create(frombmp); graphics tographics = graphics.create(tobmp); object eventlock = getapplication().geteventlock(); synchronized(eventlock) { from.drawanimationbitmap(fromgraphics); to.drawanimationbitmap(tographics); // interpolate myoffset target // set animating = false if myoffset = target invalidate(); } try { synchronized (application.geteventlock()) { ui.getuiengine().suspendpainting(true); } } catch (final exception ex) { } } protected void paint(graphics g){ //control x,y positions of bitmaps in timer task , paint paint go g.drawbitmap(0,0, 360, 480, tobmp, 0, 0); g.drawbitmap(0, 0, 360, 480, frombmp, 0, 0); // invalidate(); } protected boolean touchevent(touchevent event) { if (!this.isfocus()) return true; if (event.getevent() == touchevent.click) { // invalidate(); } return super.touchevent(event); } }
assuming you're working version 5.0 or later of os, page has simple example:
from did code sample posted in question? code not appear close working.
update: can animate transitions simply. assuming know how use timer class, have class-level variable stores current x-position of first bitmap (the variable have value of 0 initially). in each timer tick, subtract amount x-position (however many pixels want move each tick) , call invalidate();.
in each call paint method, then, draw first bitmap using x-position variable call's x parameter, , draw second bitmap using x-position variable plus width of first bitmap. resulting effect see first bitmap slide off left while second slides in right.
a caveat : because java (which means timer events not real-time - they're not guaranteed occur when want them to), animation kind of erratic , unsmooth. best way smooth animation pre-render animation cells (where each progressive combination of 2 bitmaps you're transitioning between), in paint method you're drawing single pre-rendered bitmap.
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