MyTouchImageView.java

package com.eighteengray.procamera.widget;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.drawable.Drawable;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.PointF;
import android.util.DisplayMetrics;
import android.view.MotionEvent;
import android.widget.ImageView;

import com.eighteengray.commonutillibrary.DataConvertUtil;
import com.eighteengray.commonutillibrary.ImageUtils;


@SuppressLint("DrawAllocation")
public class MyTouchImageView extends ImageView
{
	Activity activity;
	
	Bitmap gintama;
	
	Bitmap resultBitmap;

	public float x_down = 0;

	public float y_down = 0;

	PointF start = new PointF();

	PointF mid = new PointF();

	float oldDist = 1f;

	float oldRotation = 0;

	Matrix matrix = new Matrix();

	Matrix matrix1 = new Matrix();

	Matrix savedMatrix = new Matrix();

	private static final int NONE = 0;

	private static final int DRAG = 1;

	private static final int ZOOM = 2;

	int mode = NONE;

	boolean matrixCheck = false;

	int widthScreen;

	int heightScreen;

	

	public MyTouchImageView(Activity myActivity)
	{
		// TODO Auto-generated constructor stub
		super(myActivity);
		
		DisplayMetrics dm = new DisplayMetrics();
		myActivity.getWindowManager().getDefaultDisplay().getMetrics(dm);
		widthScreen = dm.widthPixels;
		heightScreen = dm.heightPixels;
		matrix = new Matrix();
	}

	
	
	protected void onDraw(Canvas canvas)
	{
		canvas.save();
		canvas.drawBitmap(gintama, matrix, null);
		
		resultBitmap = Bitmap.createBitmap(gintama, 0, 0, gintama.getWidth(), gintama.getHeight(), matrix, false);
		
		canvas.restore();
	}

	
	
	public boolean onTouchEvent(MotionEvent event)
	{
		switch (event.getAction() & MotionEvent.ACTION_MASK)
		{
		case MotionEvent.ACTION_DOWN:
			mode = DRAG;
			x_down = event.getX();
			y_down = event.getY();
			savedMatrix.set(matrix);
			break;
			
		case MotionEvent.ACTION_POINTER_DOWN:
			mode = ZOOM;
			oldDist = spacing(event);
			oldRotation = rotation(event);
			savedMatrix.set(matrix);
			midPoint(mid, event);
			break;
			
		case MotionEvent.ACTION_MOVE:
			if (mode == ZOOM)
			{
				matrix1.set(savedMatrix);
				float rotation = rotation(event) - oldRotation;
				float newDist = spacing(event);
				float scale = newDist / oldDist;
				matrix1.postScale(scale, scale, mid.x, mid.y);// �s��
				matrix1.postRotate(rotation, mid.x, mid.y);// ���D
				matrixCheck = matrixCheck();
				if (matrixCheck == false)
				{
					matrix.set(matrix1);
					invalidate();
				}
			} 
			else if (mode == DRAG)
			{
				matrix1.set(savedMatrix);
				matrix1.postTranslate(event.getX() - x_down, event.getY() - y_down);// ƽ��
				matrixCheck = matrixCheck();
				matrixCheck = matrixCheck();
				if (matrixCheck == false)
				{
					matrix.set(matrix1);
					invalidate();
				}
			}
			break;
			
		case MotionEvent.ACTION_UP:
			
			
		case MotionEvent.ACTION_POINTER_UP:
			mode = NONE;
			break;
		}
		return true;
	}

	
	
	private boolean matrixCheck()
	{
		float[] f = new float[9];
		matrix1.getValues(f);
		// ͼƬ4����������
		float x1 = f[0] * 0 + f[1] * 0 + f[2];
		float y1 = f[3] * 0 + f[4] * 0 + f[5];
		float x2 = f[0] * gintama.getWidth() + f[1] * 0 + f[2];
		float y2 = f[3] * gintama.getWidth() + f[4] * 0 + f[5];
		float x3 = f[0] * 0 + f[1] * gintama.getHeight() + f[2];
		float y3 = f[3] * 0 + f[4] * gintama.getHeight() + f[5];
		float x4 = f[0] * gintama.getWidth() + f[1] * gintama.getHeight()
				+ f[2];
		float y4 = f[3] * gintama.getWidth() + f[4] * gintama.getHeight()
				+ f[5];
		// ͼƬ�ֿ��
		double width = Math.sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2));
		// ���ű����ж�
		if (width < widthScreen / 3 || width > widthScreen * 3)
		{
			return true;
		}
		// �����ж�
		if ((x1 < widthScreen / 3 && x2 < widthScreen / 3
				&& x3 < widthScreen / 3 && x4 < widthScreen / 3)
				|| (x1 > widthScreen * 2 / 3 && x2 > widthScreen * 2 / 3
						&& x3 > widthScreen * 2 / 3 && x4 > widthScreen * 2 / 3)
				|| (y1 < heightScreen / 3 && y2 < heightScreen / 3
						&& y3 < heightScreen / 3 && y4 < heightScreen / 3)
				|| (y1 > heightScreen * 2 / 3 && y2 > heightScreen * 2 / 3
						&& y3 > heightScreen * 2 / 3 && y4 > heightScreen * 2 / 3))
		{
			return true;
		}
		return false;
	}

	
	
	// ������������
	private float spacing(MotionEvent event)
	{
		float x = event.getX(0) - event.getX(1);
		float y = event.getY(0) - event.getY(1);
		return (float) Math.sqrt(x * x + y * y);
	}

	
	
	// ȡ�������ĵ�
	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);
	}

	
	
	// ȡ��ת�Ƕ�
	private float rotation(MotionEvent event)
	{
		double delta_x = (event.getX(0) - event.getX(1));
		double delta_y = (event.getY(0) - event.getY(1));
		double radians = Math.atan2(delta_y, delta_x);
		return (float) Math.toDegrees(radians);
	}

	
	
	// ���ƶ��������Լ���ת���ͼ�㱣��Ϊ��ͼƬ
	// �����Л]���õ�ԓ��������Ҫ����DƬ�Ŀ��ԅ���
	public Bitmap CreatNewPhoto()
	{
		Bitmap bitmap = Bitmap.createBitmap(widthScreen, heightScreen,
				Config.ARGB_8888); // ����ͼƬ
		Canvas canvas = new Canvas(bitmap); // �½�����
		canvas.drawBitmap(gintama, matrix, null); // ��ͼƬ
		canvas.save(Canvas.ALL_SAVE_FLAG); // ���滭��
		canvas.restore();
		return bitmap;
	}

	
	
	@Override
	public void setImageBitmap(Bitmap bm)
	{
		// TODO Auto-generated method stub
		super.setImageBitmap(bm);
		
		this.gintama = bm;
		
	}

	
	
	@Override
	public void setImageResource(int resId)
	{
		// TODO Auto-generated method stub
		super.setImageResource(resId);
		
		Drawable drawable = getResources().getDrawable(resId);
		
		this.gintama = DataConvertUtil.drawable2Bitmap(drawable);
	}

	
	
	
	public Bitmap getResultBitmap()
	{
		return resultBitmap;
	}
	
	
	public float getX()
	{
		return mid.x;
	}
	
	
	
	public float getY()
	{
		return mid.y;
	}
	
	
	public float getStartX()
	{
		return start.x;
	}
	
	
	public float getStartY()
	{
		return start.y;
	}
	
}