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POAdd limit to zoom-in and zoom-out in android
 

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  1. POAdd limit to zoom-in and zoom-out in android
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    <p>I have an imageview that can be zoomed. I have a code that works well, but my problem is that I want to add a limit for maximum and minimum zooming levels.</p> <pre><code>import android.annotation.TargetApi; import android.app.ActionBar; import android.app.Activity; import android.graphics.Matrix; import android.graphics.PointF; import android.os.Build; import android.os.Bundle; import android.util.FloatMath; import android.util.Log; import android.view.MenuItem; import android.view.MotionEvent; import android.view.View; import android.view.View.OnTouchListener; import android.widget.ImageView; @TargetApi(Build.VERSION_CODES.HONEYCOMB) public class Reach extends Activity implements OnTouchListener { private static final String TAG = "Touch"; @SuppressWarnings("unused") private static final float MIN_ZOOM = 1f,MAX_ZOOM = 1f; // These matrices will be used to scale points of the image Matrix matrix = new Matrix(); Matrix savedMatrix = new Matrix(); // The 3 states (events) which the user is trying to perform static final int NONE = 0; static final int DRAG = 1; static final int ZOOM = 2; int mode = NONE; // these PointF objects are used to record the point(s) the user is touching PointF start = new PointF(); PointF mid = new PointF(); float oldDist = 1f; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.reach_us); int currentAPIVersion = android.os.Build.VERSION.SDK_INT; if (currentAPIVersion &gt;= android.os.Build.VERSION_CODES.HONEYCOMB) { // RUN THE CODE SPECIFIC TO THE API LEVELS ABOVE HONEYCOMB (API 11+) ActionBar actionBar = getActionBar(); actionBar.setDisplayHomeAsUpEnabled(true); } ImageView view=(ImageView)findViewById(R.id.map); view.setOnTouchListener(this); } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case android.R.id.home: { this.finish(); return true; } default: return super.onOptionsItemSelected(item); } } @Override public boolean onTouch(View v, MotionEvent event) { ImageView view = (ImageView) v; view.setScaleType(ImageView.ScaleType.MATRIX); float scale; dumpEvent(event); // Handle touch events here... switch (event.getAction() &amp; MotionEvent.ACTION_MASK) { case MotionEvent.ACTION_DOWN: // first finger down only savedMatrix.set(matrix); start.set(event.getX(), event.getY()); Log.d(TAG, "mode=DRAG"); // write to LogCat mode = DRAG; break; case MotionEvent.ACTION_UP: // first finger lifted case MotionEvent.ACTION_POINTER_UP: // second finger lifted mode = NONE; Log.d(TAG, "mode=NONE"); break; case MotionEvent.ACTION_POINTER_DOWN: // first and second finger down oldDist = spacing(event); Log.d(TAG, "oldDist=" + oldDist); if (oldDist &gt; 5f) { savedMatrix.set(matrix); midPoint(mid, event); mode = ZOOM; Log.d(TAG, "mode=ZOOM"); } break; case MotionEvent.ACTION_MOVE: if (mode == DRAG) { matrix.set(savedMatrix); matrix.postTranslate(event.getX() - start.x, event.getY() - start.y); // create the transformation in the matrix of points } else if (mode == ZOOM) { // pinch zooming float newDist = spacing(event); Log.d(TAG, "newDist=" + newDist); if (newDist &gt; 5f) { matrix.set(savedMatrix); scale = newDist / oldDist; // setting the scaling of the // matrix...if scale &gt; 1 means // zoom in...if scale &lt; 1 means // zoom out matrix.postScale(scale, scale, mid.x, mid.y); } } break; } view.setImageMatrix(matrix); // display the transformation on screen return true; // indicate event was handled } /* * -------------------------------------------------------------------------- * Method: spacing Parameters: MotionEvent Returns: float Description: * checks the spacing between the two fingers on touch * ---------------------------------------------------- */ private float spacing(MotionEvent event) { float x = event.getX(0) - event.getX(1); float y = event.getY(0) - event.getY(1); return FloatMath.sqrt(x * x + y * y); } /* * -------------------------------------------------------------------------- * Method: midPoint Parameters: PointF object, MotionEvent Returns: void * Description: calculates the midpoint between the two fingers * ------------------------------------------------------------ */ private void midPoint(PointF point, MotionEvent event) { float x = event.getX(0) + event.getX(1); float y = event.getY(0) + event.getY(1); point.set(x / 2, y / 2); } /** Show an event in the LogCat view, for debugging */ private void dumpEvent(MotionEvent event) { String names[] = { "DOWN", "UP", "MOVE", "CANCEL", "OUTSIDE","POINTER_DOWN", "POINTER_UP", "7?", "8?", "9?" }; StringBuilder sb = new StringBuilder(); int action = event.getAction(); int actionCode = action &amp; MotionEvent.ACTION_MASK; sb.append("event ACTION_").append(names[actionCode]); if (actionCode == MotionEvent.ACTION_POINTER_DOWN || actionCode == MotionEvent.ACTION_POINTER_UP) { sb.append("(pid ").append(action &gt;&gt; MotionEvent.ACTION_POINTER_ID_SHIFT); sb.append(")"); } sb.append("["); for (int i = 0; i &lt; event.getPointerCount(); i++) { sb.append("#").append(i); sb.append("(pid ").append(event.getPointerId(i)); sb.append(")=").append((int) event.getX(i)); sb.append(",").append((int) event.getY(i)); if (i + 1 &lt; event.getPointerCount()) sb.append(";"); } sb.append("]"); Log.d("Touch Events ---------", sb.toString()); } } </code></pre> <p>I have seen lot of question &amp; answers linked with this, but no one really helps me. Please give me a solution. Thanks in advance</p>
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    1. COWhat exactly is the problem? The code shows and even comments exactly where the zooming happens, so just check the current zoom against some max there and do whatever you want (disable, message...) if exceeded.
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      1. USStefan de Bruijn
    2. COI cant figure out where is I need to change the above code...plz help me.
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    3. COHow about where it says "// pinch zooming" ...
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      1. POAdd limit to zoom-in and zoom-out in android
      1. USStefan de Bruijn
 

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