Hi, I have been working on this for a while without any progress.:( And sorry for the duplicate/cross posts:) Basically what I'd like to do is like iPhone style zoom: user clicks on an image and it zooms in around the touch point center, with animation applied; if user clicks somewhere again on the image, it continues to zoom to the next level, again around the touch point center.
I am using ImageView inside a LinearLayout and ScaleAnimation to do this: ScaleAnimation scalAnim = new ScaleAnimatin(curSX, nextSX, curSY, curSY, Animation.RELATIVE_TO_SELF, pivotX, Animation.RELATIVE_TO_SELF, pivotY); animImageView.setAfterFill(true); animImageView.setDuration(750); animImageView.startAnimation(scalAnim); I am using MotionEvent.getX()/getY() to assign to pivotX/Y. Of course the code works only for the first touch. The pivot point is off for the subsequent touches. As I found out, MotionEvent.getX()/getY() actually return the pixel values in the LinearLayout coordinate space (I implement onTouchListener on my ImageView). My problem is that I don't understand how to get the correct pivotX/Y values, by mapping getX()/ getY() into the imgeView's drawable coordinate space, as well as getting the current width and height of the drawable which may have transformation(s) applied, using the SDK API. Or should I use ScaleAnimation scalAnim = new ScaleAnimatin(curSX, nextSX, curSY, curSY); and manipulate underlying matrix within the onDraw() method of my ImageView? Obviously the following code is not working as expected. But I have no clue as how to make it work. Again, I wish I better understood the maths involved as well as how to implement it with the API: Transformation outTrans = new Trasnformation(); scalAnim.getTransformation( System.currentTimeMillis(), outTrans ); Matrix m = outTrans.getMatrix(); m.preTranslate(-pX, -pY );//pX == MotionEvent.getX(); pY == MotionEvent.getY() m.postTranslate(pX, pY ); canvas.concat( m ); myDrawable.draw( canvas ); Any guidance appreciated. Thanks much in advance! --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
