No,it is not scrolling. Can anybody provide me an example of drawing bitmaps to a scroll custom view.
It is very urgent. Please help. Thanks Kavitha On Wed, Nov 10, 2010 at 6:15 AM, Paul Turchenko <[email protected]>wrote: > View scrolls the bitmap for you. > > On Nov 10, 12:29 am, kavitha b <[email protected]> wrote: > > Hi All, > > > > I am creating a CustomView with bigger image based on tutorial on and > > developers forum. > > > > It is scolling fine.I need exact pixel coordinates of my image.I am > getting > > that also. > > > > now I want to draw some images upon scrolling image.I am able to draw > images > > using onDraw().But images are not getting scrolled.Any idea how to > resolve > > this? > > > > My code is > > > > public class LargeImageScroller extends Activity { > > > > // Physical display width and height. > > private static int displayWidth = 0; > > private static int displayHeight = 0; > > private static Vector<Square> squares; > > private static Vector<Tile> tiles; > > > > /** Called when the activity is first created. */ > > @Override > > public void onCreate(Bundle savedInstanceState) { > > super.onCreate(savedInstanceState); > > > > // displayWidth and displayHeight will change depending on screen > > // orientation. To get these dynamically, we should hook > > onSizeChanged(). > > // This simple example uses only landscape mode, so it's ok to > get > > them > > // once on startup and use those values throughout. > > Display display = ((WindowManager) > > > getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay(); > > displayWidth = display.getWidth(); > > displayHeight = display.getHeight(); > > > > squares=Util.generateBoardSquares(); > > tiles=Util.generateTiles(this); > > > > // SampleView constructor must be constructed last as it needs > the > > // displayWidth and displayHeight we just got. > > setContentView(new SampleView(this)); > > } > > > > private static class SampleView extends View { > > private static Bitmap bmLargeImage; //bitmap large enough to be > > scrolled > > private static Rect displayRect = null; //rect we display to > > private Rect scrollRect = null; //rect we scroll over our bitmap > > with > > private int scrollRectX = 0; //current left location of scroll > rect > > private int scrollRectY = 0; //current top location of scroll > rect > > private float scrollByX = 0; //x amount to scroll by > > private float scrollByY = 0; //y amount to scroll by > > private float startX = 0; //track x from one ACTION_MOVE to the > next > > private float startY = 0; //track y from one ACTION_MOVE to the > next > > > > private final int boardHeight=480-150; > > private static Tile movingTile=null; > > > > public SampleView(Context context) { > > super(context); > > > > // Destination rect for our main canvas draw. It never > changes. > > displayRect = new Rect(0, 0, displayWidth, boardHeight); > > // Scroll rect: this will be used to 'scroll around' over the > > // bitmap in memory. Initialize as above. > > scrollRect = new Rect(0, 0, displayWidth, boardHeight); > > > > // Load a large bitmap into an offscreen area of memory. > > bmLargeImage = BitmapFactory.decodeResource(getResources(), > > R.drawable.woodstandardboard); > > } > > > > @Override > > public boolean onTouchEvent(MotionEvent event) { > > > > switch (event.getAction()) { > > case MotionEvent.ACTION_DOWN: > > // Remember our initial down event location. > > ///validating for tile touch > > int touchx=(int)event.getX(); > > int touchy=(int)event.getY(); > > for(int i=0;i<tiles.size();i++){ > > Tile tile=tiles.get(i); > > if(tile.isTouched(touchx, touchy)){ > > tile.setX(touchx); > > tile.setY(touchy); > > movingTile=tile; > > invalidate(); > > } > > } > > > > if(movingTile != null){ > > > > break; > > } > > > > if((int)event.getY() > boardHeight){ > > break; > > } > > startX = event.getRawX(); > > startY = event.getRawY(); > > break; > > > > case MotionEvent.ACTION_MOVE: > > > > if(movingTile != null){ > > int touchedx=(int)event.getX(); > > int touchedy=(int)event.getY(); > > > movingTile.setX(touchedx-Util.SQUARE_DIMENSIONS/2); > > > movingTile.setY(touchedy-Util.SQUARE_DIMENSIONS/2); > > invalidate(); > > > > break; > > } > > > > if((int)event.getY() > boardHeight){ > > break; > > } > > > > float x = event.getRawX(); > > float y = event.getRawY(); > > // Calculate move update. This will happen many times > > // during the course of a single movement gesture. > > scrollByX = x - startX; //move update x increment > > scrollByY = y - startY; //move update y increment > > startX = x; //reset initial values to latest > > startY = y; > > > > invalidate(); //force a redraw > > break; > > > > case MotionEvent.ACTION_UP: > > > > ///check if touch is on board > > int boardx=(int)event.getX()+(int)scrollRectX; > > int boardy=(int)event.getY()+(int)scrollRectY; > > System.out.println(boardx); > > > > if(movingTile != null){ > > > > int id=Util.checkSquareTouched(squares, boardx, > > boardy); > > System.out.println("ID OF SQUARE="+id); > > if(id > 0){//valid square is touched > > Square square=Util.getSquareWithID(squares, > id); > > movingTile.setX(square.getX()); > > movingTile.setY(square.getY()); > > System.out.println("ID OF > > TILe="+movingTile.getId()); > > > > } > > > > movingTile=null; > > invalidate(); > > break; > > } > > > > break; > > } > > return true; //done with this event so consume it > > } > > > > @Override > > protected void onDraw(Canvas canvas) { > > > > // Our move updates are calculated in ACTION_MOVE in the > > opposite direction > > // from how we want to move the scroll rect. Think of this as > > dragging to > > // the left being the same as sliding the scroll rect to the > > right. > > > > int newScrollRectX = scrollRectX - (int)scrollByX; > > int newScrollRectY = scrollRectY - (int)scrollByY; > > > > // Don't scroll off the left or right edges of the > bitmap. > > if (newScrollRectX < 0) > > newScrollRectX = 0; > > else if (newScrollRectX > (bmLargeImage.getWidth() - > > displayWidth)) > > newScrollRectX = (bmLargeImage.getWidth() - > > displayWidth); > > > > // Don't scroll off the top or bottom edges of the > bitmap. > > if (newScrollRectY < 0) > > newScrollRectY = 0; > > else if (newScrollRectY > (bmLargeImage.getHeight() - > > boardHeight)) > > newScrollRectY = (bmLargeImage.getHeight() - > > boardHeight); > > > > // We have our updated scroll rect coordinates, set them > and > > draw. > > if(movingTile == null){ > > scrollRect.set(newScrollRectX, newScrollRectY, > > newScrollRectX + displayWidth, newScrollRectY > + > > boardHeight); > > } > > Paint paint = new Paint(); > > canvas.drawBitmap(bmLargeImage, scrollRect, displayRect, > > paint); > > > > // Reset current scroll coordinates to reflect the latest > > updates, > > // so we can repeat this update process. > > scrollRectX = newScrollRectX; > > scrollRectY = newScrollRectY; > > > > //drawing tiles here > > for(int i=0;i<tiles.size();i++){ > > Tile tile=tiles.get(i); > > // if( movingTile == null && tile.getX() > scrollRectX && > > tile.getY() > scrollRectY) > > tile.onDraw(canvas,paint); > > > > } > > > > } > > } > > > > } > > -- > 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]<android-developers%[email protected]> > For more options, visit this group at > http://groups.google.com/group/android-developers?hl=en -- You received this message because you are subscribed to the Google Groups "Android Developers" group. 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