From ec8f0e387aa0bee03b47baca8888b4094ee8fa43 Mon Sep 17 00:00:00 2001
From: Steve Slaven <bpk@hoopajoo.net>
Date: Sat, 1 Jan 2011 13:14:06 -0800
Subject: Adding smoother class to try and stop the drag jitter, currently it
 does not smoothing but should allow swapping out smoothing ideas pretty easy


diff --git a/src/net/hoopajoo/android/SoftKeys/InputSmoother.java b/src/net/hoopajoo/android/SoftKeys/InputSmoother.java
new file mode 100644
index 0000000..812c3b4
--- /dev/null
+++ b/src/net/hoopajoo/android/SoftKeys/InputSmoother.java
@@ -0,0 +1,109 @@
+/*
+ *
+ *  Copyright (c) 2010 Steve Slaven
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+*/
+package net.hoopajoo.android.SoftKeys;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+import java.util.ListIterator;
+
+// keeps a list of points to drop outliers that make your drag jitter
+public class InputSmoother {
+    private List<PointCheck> mPoints = new ArrayList<PointCheck>();
+    private int mHistLength;
+    private PointCheck mCurrent;
+    
+    InputSmoother( int histLength ) {
+        mHistLength = histLength;
+    }
+    
+    public void addPoint( int x, int y ) {
+        PointCheck p = new PointCheck();
+        p.x = x;
+        p.y = y;
+        mPoints.add( p );
+        
+        // if points too big pop out the last
+        if( mPoints.size() > mHistLength ) {
+            mPoints.remove( 0 );
+        }
+    }
+    
+    public void updateOutliers() {
+        // flag the outliers
+        for( PointCheck p : mPoints ) {
+            p.outlier = false;
+        }
+     
+        // set current as the last non-outlier
+        mCurrent = null;
+        for( PointCheck p : new ListReverser<PointCheck>( mPoints ) ) {
+            if( mCurrent != null ) {
+                if( p.outlier == false ) {
+                    mCurrent = p;
+                }
+            }
+        }
+        
+        // if still null just give it the last one even though it's an outlier
+        if( mCurrent == null ) {
+            mCurrent = mPoints.get( mPoints.size() - 1 );
+        }
+    }
+    
+    public int[] getCurrent() {
+        int[] ret = new int[ 2 ];
+        ret[ 0 ] = mCurrent.x;
+        ret[ 1 ] = mCurrent.y;
+        return( ret );
+    }
+    
+    private class PointCheck {
+        public int x;
+        public int y;
+        public boolean outlier;
+    }
+    
+    class ListReverser<T> implements Iterable<T> {
+        private ListIterator<T> listIterator;        
+
+        public ListReverser(List<T> wrappedList) {
+            this.listIterator = wrappedList.listIterator(wrappedList.size());            
+        }               
+
+        public Iterator<T> iterator() {
+            return new Iterator<T>() {
+
+                public boolean hasNext() {
+                    return listIterator.hasPrevious();
+                }
+
+                public T next() {
+                    return listIterator.previous();
+                }
+
+                public void remove() {
+                    listIterator.remove();
+                }
+
+            };
+        }
+
+    }
+}
diff --git a/src/net/hoopajoo/android/SoftKeys/SoftKeysService.java b/src/net/hoopajoo/android/SoftKeys/SoftKeysService.java
index faa2a14..d5e15d7 100644
--- a/src/net/hoopajoo/android/SoftKeys/SoftKeysService.java
+++ b/src/net/hoopajoo/android/SoftKeys/SoftKeysService.java
@@ -44,6 +44,7 @@ import android.widget.ImageButton;
 import android.widget.LinearLayout;
 
 public class SoftKeysService extends Service {
+    private InputSmoother i;
     private View mView;
     private View mBumpView;
     private boolean auto_hide;
@@ -169,8 +170,11 @@ public class SoftKeysService extends Service {
                         mDraggingView = true;
                         mDidDrag = true;
 
-                        int currX = (int)me.getRawX();
-                        int currY = (int)me.getRawY(); 
+                        i.addPoint( (int)me.getRawX(), (int)me.getRawY() );
+                        i.updateOutliers();
+                        int[] pts = i.getCurrent();
+                        int currX = pts[ 0 ];
+                        int currY = pts[ 1 ];                     
                         
                         // make our deltas work relative to movement, y
                         int dx = currX - mDraggingOrigX;
@@ -215,6 +219,7 @@ public class SoftKeysService extends Service {
                         
                         WindowManager wm = (WindowManager)getSystemService(WINDOW_SERVICE);
                         wm.updateViewLayout( root, l );
+                                         
                         return( true );
                     }
                 }
@@ -300,6 +305,8 @@ public class SoftKeysService extends Service {
         wm.addView( mBumpView, makeOverlayParams() );
         wm.addView( mView, makeOverlayParams() );
 
+        i = new InputSmoother( 5 );
+        
         initOrientation();
     }
 
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