package com.example.zzzz;

import android.app.Activity;

import android.graphics.Matrix; import android.graphics.PointF; import android.os.Bundle; import android.view.MotionEvent; import android.view.View; import android.view.View.OnTouchListener; import android.widget.ImageView;

public class TouchActivity extends Activity {

     private static final int NONE = 0;  private static final int MOVE = 1;  private static final int ZOOM = 2;  private static final int ROTATION = 1;   private int mode = NONE;  private Matrix matrix = new Matrix();  private Matrix savedMatrix = new Matrix();  private PointF start = new PointF();  private PointF mid = new PointF();  private float s = 0;  private float oldDistance;  private int rotate = NONE;     @Override     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);                 ImageView imageView = (ImageView)findViewById(R.id.imageView1);         imageView.setOnTouchListener(new OnTouchListener()         {    @Override    public boolean onTouch(View view, MotionEvent event) {     ImageView imageView = (ImageView)view;     switch (event.getAction()&MotionEvent.ACTION_MASK) {     case MotionEvent.ACTION_DOWN:      savedMatrix.set(matrix);      start.set(event.getX(), event.getY());      mode = MOVE;      rotate = NONE;      break;     case MotionEvent.ACTION_UP:     case MotionEvent.ACTION_POINTER_UP:      mode = NONE;      break;     case MotionEvent.ACTION_POINTER_DOWN:      oldDistance = (float)Math.sqrt((event.getX(0)-event.getX(1))*(event.getX(0)-event.getX(1))+(event.getY(0)-event.getY(1))*(event.getY(0)-event.getY(1)));      if (oldDistance > 10f) {       savedMatrix.set(matrix);       mid.set((event.getX(0)+event.getX(1))/2, (event.getY(0)+event.getY(1))/2);       mode = ZOOM;      }     case MotionEvent.ACTION_MOVE:      if (mode == MOVE)      {       if(rotate == NONE) {        savedMatrix.set(matrix);        mid.set(event.getX(), event.getY());        rotate = ROTATION;       }       else {        matrix.set(savedMatrix);        double a = Math.atan((mid.y-start.y)/(mid.x-start.x));        double b = Math.atan((event.getY()-mid.y)/(event.getX()-mid.x));        if ((b - a < Math.PI/2 && b - a > Math.PI / 18)||((b + Math.PI) % Math.PI - a < Math.PI/2 && (b + Math.PI) % Math.PI - a > Math.PI / 18)) {         matrix.postScale((float)0.9, (float)0.9);        }        else if ((a - b < Math.PI / 2 && a - b > Math.PI / 18)||((a + Math.PI) % Math.PI - b < Math.PI/2 && (a + Math.PI) % Math.PI - b > Math.PI / 18)) {         matrix.postScale((float)1.1, (float)1.1);        }        start.set(event.getX(), event.getY());        rotate = NONE;       }      }      else if(mode == ZOOM)      {       float newDistance;       newDistance = (float)Math.sqrt((event.getX(0)-event.getX(1))*(event.getX(0)-event.getX(1))+(event.getY(0)-event.getY(1))*(event.getY(0)-event.getY(1)));       if(newDistance > 10f) {        matrix.set(savedMatrix);        matrix.postScale(newDistance/oldDistance, newDistance/oldDistance, mid.x, mid.y);        oldDistance = newDistance;        savedMatrix.set(matrix);       }      }      break;     }     imageView.setImageMatrix(matrix);     return true;    }                   });     } }