圖像處理-縮放-平移旋轉等等

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="縮放" />

        <SeekBar
            android:id="@+id/seekBar_scale"
            android:layout_width="200dp"
            android:layout_height="wrap_content"
            android:max="5"/>

        <TextView
            android:id="@+id/scale_data"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="1" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="旋轉" />

        <SeekBar
            android:id="@+id/seekBar_rotate"
            android:max="360"
            android:layout_width="200dp"
            android:layout_height="wrap_content" />

        <TextView
            android:id="@+id/rotate_data"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="0°" />
    </LinearLayout>

     <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="平移" />

        <SeekBar
            android:id="@+id/seekBar_tran"
            android:max="100"
            android:progress="50"
            android:layout_width="200dp"
            android:layout_height="wrap_content" />

        <TextView
            android:id="@+id/tran_data"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="0" />
    </LinearLayout>
    
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center" >
        <ImageView
            android:id="@+id/iv_2"
            android:src="@drawable/ic_launcher"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>
    </LinearLayout>

</LinearLayout>

package com.pas.image.tosmall;

import android.os.Bundle;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.view.Menu;
import android.widget.ImageView;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.SeekBar.OnSeekBarChangeListener;

public class MainActivity extends Activity implements OnSeekBarChangeListener
{

	private ImageView iv2;
	private Bitmap basebitmap;
	private Bitmap scalebitmap;
	//縮放
	private SeekBar bar_scale;
	private TextView tv_scale;
	//旋轉
	private SeekBar bar_rotate;
	private TextView tv_rotate;
	//平移
	private SeekBar bar_tran;
	private TextView tv_tran;
	@Override
	protected void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		iv2 = (ImageView) findViewById(R.id.iv_2);
		bar_scale=(SeekBar) findViewById(R.id.seekBar_scale);
		bar_rotate=(SeekBar) findViewById(R.id.seekBar_rotate);
		bar_tran=(SeekBar) findViewById(R.id.seekBar_tran);
		bar_scale.setOnSeekBarChangeListener(this);
		bar_rotate.setOnSeekBarChangeListener(this);
		bar_tran.setOnSeekBarChangeListener(this);
		tv_scale=(TextView) findViewById(R.id.scale_data);
		tv_rotate=(TextView) findViewById(R.id.rotate_data);
		tv_tran=(TextView) findViewById(R.id.tran_data);
		basebitmap = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);
	}

	/**
	 * 縮放
	 */
	private void scale()
	{
		int scale=bar_scale.getProgress()+1;
		int degrees=bar_rotate.getProgress();
		int trans=bar_tran.getProgress();
		int width=basebitmap.getWidth()*scale+Math.abs(trans-50);
		int height=basebitmap.getHeight()*scale+Math.abs(trans-50);
		
		scalebitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
		Canvas canvas = new Canvas(scalebitmap);
		Paint paint = new Paint();
		paint.setStrokeWidth(5);
		paint.setColor(Color.BLACK);
		//消除鋸齒
		paint.setAntiAlias(true);
		Matrix matrix = new Matrix();
		//縮放
		matrix.postScale(scale, scale);
		//旋轉 度數（0-360） 基準點
		matrix.postRotate(degrees, width/2f, height/2f);
		//平移
		matrix.postTranslate(trans-50,trans-50);
		
		//鏡像
		matrix.postScale(-1, 1);
		matrix.postTranslate(scalebitmap.getWidth(), 0);
		//倒影
		matrix.postScale(1, -1);
		matrix.postTranslate(0, scalebitmap.getHeight());
		canvas.drawBitmap(basebitmap, matrix, paint);
		iv2.setImageBitmap(scalebitmap);
	}
	
	@Override
	public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser)
	{
		if(seekBar==bar_scale)
		{
			tv_scale.setText(progress+1+"");
		}
		if(seekBar==bar_rotate)
		{
			tv_rotate.setText(progress+"゜");
		}
		if(seekBar==bar_tran)
		{
			tv_tran.setText(progress-50+"");
		}
		scale();
	}

	@Override
	public void onStartTrackingTouch(SeekBar seekBar)
	{
	}

	@Override
	public void onStopTrackingTouch(SeekBar seekBar)
	{
	}

}