package com.roboo.like.netease.listener;
import android.graphics.Matrix;
import android.graphics.Point;
import android.graphics.PointF;
import android.util.FloatMath;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.ImageView;
import android.widget.ImageView.ScaleType;
public class MulitPointTouchListener implements OnTouchListener
{
// These matrices will be used to move and zoom image
Matrix matrix = new Matrix();
Matrix savedMatrix = new Matrix();
public ImageView image;
// We can be in one of these 3 states
static final int NONE = 0;
static final int DRAG = 1;
static final int ZOOM = 2;
int mode = NONE;
// Remember some things for zooming
PointF start = new PointF();
PointF mid = new PointF();
float oldDist = 1f;
public MulitPointTouchListener(ImageView image)
{
super();
this.image = image;
}
@Override
public boolean onTouch(View v, MotionEvent event)
{
this.image.setScaleType(ScaleType.MATRIX);
ImageView view = (ImageView) v;
// Log.e("view_width",
// view.getImageMatrix()..toString()+"*"+v.getWidth());
// Dump touch event to log
dumpEvent(event);
// Handle touch events here...
switch (event.getAction() & MotionEvent.ACTION_MASK)
{
case MotionEvent.ACTION_DOWN:
matrix.set(view.getImageMatrix());
savedMatrix.set(matrix);
start.set(event.getX(), event.getY());
// Log.d(TAG, "mode=DRAG");
mode = DRAG;
/*
* float scaleWidth=180f/320; float scaleHeight=240f/480;
* matrix.reset(); matrix.postScale(scaleWidth, scaleHeight);
*/
// Log.d(TAG, "mode=NONE");
break;
case MotionEvent.ACTION_POINTER_DOWN:
oldDist = spacing(event);
// Log.d(TAG, "oldDist=" + oldDist);
if (oldDist > 10f)
{
savedMatrix.set(matrix);
midPoint(mid, event);
mode = ZOOM;
// Log.d(TAG, "mode=ZOOM");
}
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_POINTER_UP:
mode = NONE;
// Log.e("view.getWidth", view.getWidth() + "");
// Log.e("view.getHeight", view.getHeight() + "");
break;
case MotionEvent.ACTION_MOVE:
if (mode == DRAG)
{
// ...
matrix.set(savedMatrix);
float x = event.getX() - start.x;
float y = event.getY() - start.y;
matrix.postTranslate( x,y);
}
else if (mode == ZOOM)
{
float newDist = spacing(event);
// Log.d(TAG, "newDist=" + newDist);
if (newDist > 10f)
{
matrix.set(savedMatrix);
float scale = newDist / oldDist;
System.out.println("scale = " + scale);
matrix.postScale(scale, scale, mid.x, mid.y);
}
}
break;
}
view.setImageMatrix(matrix);
// return true; // indicate event was handled
return false;
}
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 & 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 >> MotionEvent.ACTION_POINTER_ID_SHIFT);
sb.append(")");
}
sb.append("[");
for (int i = 0; i < 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 < event.getPointerCount())
sb.append(";");
}
sb.append("]");
// Log.d(TAG, sb.toString());
}
/** Determine the space between the first two fingers */
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);
}
/** Calculate the mid point of the first 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);
}
}