RotateBitmap.java

package com.echo5bravo.govre.UTILS.ImageZoom;

import android.graphics.Bitmap;
import android.graphics.Matrix;
import android.graphics.RectF;

public class RotateBitmap {
	
	public static final String	TAG	= "RotateBitmap";
	private Bitmap					mBitmap;
	private int						mRotation;
	private int						mWidth;
	private int						mHeight;
	private int						mBitmapWidth;
	private int						mBitmapHeight;
	
	public RotateBitmap( Bitmap bitmap, int rotation )
	{
		mRotation = rotation % 360;
		setBitmap( bitmap );
	}
	
	public void setRotation( int rotation )
	{
		mRotation = rotation;
		invalidate();
	}
	
	public int getRotation()
	{
		return mRotation % 360;
	}
	
	public Bitmap getBitmap()
	{
		return mBitmap;
	}
	
	public void setBitmap( Bitmap bitmap )
	{
		mBitmap = bitmap;
		
		if ( mBitmap != null ) {
			mBitmapWidth = bitmap.getWidth();
			mBitmapHeight = bitmap.getHeight();
			invalidate();
		}
	}
	
	private void invalidate()
	{
		Matrix matrix = new Matrix();
		int cx = mBitmapWidth / 2;
		int cy = mBitmapHeight / 2;
		matrix.preTranslate( -cx, -cy );
		matrix.postRotate( mRotation );
		matrix.postTranslate( cx, cx );
		
		RectF rect = new RectF( 0, 0, mBitmapWidth, mBitmapHeight );
		matrix.mapRect( rect );
		mWidth = (int)rect.width();
		mHeight = (int)rect.height();
	}
	
	public Matrix getRotateMatrix()
	{
		Matrix matrix = new Matrix();
		if ( mRotation != 0 ) {
			int cx = mBitmapWidth / 2;
			int cy = mBitmapHeight / 2;
			matrix.preTranslate( -cx, -cy );
			matrix.postRotate( mRotation );
			matrix.postTranslate( mWidth / 2, mHeight / 2 );
		}
		
		return matrix;
	}
	
	public int getHeight()
	{
		return mHeight;
	}
	
	public int getWidth()
	{
		return mWidth;
	}
	
	public void recycle()
	{
		if ( mBitmap != null ) {
			mBitmap.recycle();
			mBitmap = null;
		}
	}
}