--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/tz/signaturecapture/SignatureWidget.java	Fri Jan 10 12:56:01 2014 +0100
@@ -0,0 +1,137 @@
+package tz.signaturecapture;
+
+import java.io.OutputStream;
+
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.graphics.Path;
+import android.graphics.RectF;
+import android.util.AttributeSet;
+import android.util.Log;
+import android.view.MotionEvent;
+import android.view.View;
+
+public class SignatureWidget extends View
+{
+    private static final float STROKE_WIDTH = 5f;
+    private static final float HALF_STROKE_WIDTH = STROKE_WIDTH / 2;
+    private Paint paint = new Paint();
+    private Path path = new Path();
+
+    private float lastTouchX;
+    private float lastTouchY;
+    private final RectF dirtyRect = new RectF();
+
+    public SignatureWidget(Context context, AttributeSet attrs)
+    {
+        super(context, attrs);
+        paint.setAntiAlias(true);
+        paint.setColor(Color.BLACK);
+        paint.setStyle(Paint.Style.STROKE);
+        paint.setStrokeJoin(Paint.Join.ROUND);
+        paint.setStrokeWidth(STROKE_WIDTH);
+    }
+
+    public void save(View parent, OutputStream os)
+    {
+        Log.v("log_tag", "Width: " + parent.getWidth());
+        Log.v("log_tag", "Height: " + parent.getHeight());
+        Bitmap bm =  Bitmap.createBitmap(parent.getWidth(), parent.getHeight(), Bitmap.Config.RGB_565);;
+        Canvas canvas = new Canvas(bm);
+        parent.draw(canvas);
+        bm.compress(Bitmap.CompressFormat.PNG, 90, os);
+    }
+
+    public void clear()
+    {
+        path.reset();
+        invalidate();
+    }
+
+    @Override
+    protected void onDraw(Canvas canvas)
+    {
+        canvas.drawPath(path, paint);
+    }
+
+    @Override
+    public boolean onTouchEvent(MotionEvent event)
+    {
+        float eventX = event.getX();
+        float eventY = event.getY();
+
+        switch (event.getAction())
+        {
+        case MotionEvent.ACTION_DOWN:
+            path.moveTo(eventX, eventY);
+            lastTouchX = eventX;
+            lastTouchY = eventY;
+            return true;
+
+        case MotionEvent.ACTION_MOVE:
+
+        case MotionEvent.ACTION_UP:
+
+            resetDirtyRect(eventX, eventY);
+            int historySize = event.getHistorySize();
+            for (int i = 0; i < historySize; i++)
+            {
+                float historicalX = event.getHistoricalX(i);
+                float historicalY = event.getHistoricalY(i);
+                expandDirtyRect(historicalX, historicalY);
+                path.lineTo(historicalX, historicalY);
+            }
+            path.lineTo(eventX, eventY);
+            break;
+
+        default:
+            debug("Ignored touch event: " + event.toString());
+            return false;
+        }
+
+        invalidate((int) (dirtyRect.left - HALF_STROKE_WIDTH),
+                (int) (dirtyRect.top - HALF_STROKE_WIDTH),
+                (int) (dirtyRect.right + HALF_STROKE_WIDTH),
+                (int) (dirtyRect.bottom + HALF_STROKE_WIDTH));
+
+        lastTouchX = eventX;
+        lastTouchY = eventY;
+
+        return true;
+    }
+
+    private void debug(String string){
+    }
+
+    private void expandDirtyRect(float historicalX, float historicalY)
+    {
+        if (historicalX < dirtyRect.left)
+        {
+            dirtyRect.left = historicalX;
+        }
+        else if (historicalX > dirtyRect.right)
+        {
+            dirtyRect.right = historicalX;
+        }
+
+        if (historicalY < dirtyRect.top)
+        {
+            dirtyRect.top = historicalY;
+        }
+        else if (historicalY > dirtyRect.bottom)
+        {
+            dirtyRect.bottom = historicalY;
+        }
+    }
+
+    private void resetDirtyRect(float eventX, float eventY)
+    {
+        dirtyRect.left = Math.min(lastTouchX, eventX);
+        dirtyRect.right = Math.max(lastTouchX, eventX);
+        dirtyRect.top = Math.min(lastTouchY, eventY);
+        dirtyRect.bottom = Math.max(lastTouchY, eventY);
+    }
+}