Android bitmap的拷贝以及平移旋转缩放等效果

package com.example.bitmap;

import android.app.Activity;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.graphics.Canvas;

import android.graphics.Matrix;

import android.graphics.Paint;

import android.os.Bundle;

import android.view.View;

import android.widget.ImageView;

public class MainActivity extends Activity {

private ImageView iv1;

private ImageView iv2;

private Bitmap srcBitmap;

private Bitmap alterBitmap;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

iv1=(ImageView) findViewById(R.id.iv1);

iv2=(ImageView) findViewById(R.id.iv2);

//1.给v1设置一个位图

srcBitmap=BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);

iv1.setImageBitmap(srcBitmap);

//2.创建一个空白的位图

alterBitmap=Bitmap.createBitmap(srcBitmap.getWidth()*3, srcBitmap.getHeight(), srcBitmap.getConfig());

}

public void click(View view){

//1.把空白的位图给了画板  准备画画

Canvas canvas=new Canvas(alterBitmap);

//2.设置画笔

Paint paint=new Paint();

paint.setAntiAlias(true);  //消除锯齿

//3.画位图

Matrix m=new Matrix();

//1.设置缩放的比例

//m.setScale(1.0f, 2.0f);

//2.指定圆心的旋转90度

//m.setRotate(90,srcBitmap.getWidth()/2,srcBitmap.getHeight()/2);

//3.镜子效果

/*m.setScale(-1.0f, 1.0f);//先镜子到y轴的左侧

m.postTranslate(srcBitmap.getWidth(), 0);//然后在向右平移到屏幕上

*/

//4.倒影效果

/*m.setScale(1.0f, -1.0f);//线倒影要图片的下面

m.postTranslate(0, srcBitmap.getHeight());//然后向上平移到原来的位置*/

//5.平移效果

m.setTranslate(100,20);

canvas.drawBitmap(srcBitmap,m, paint);

iv2.setImageBitmap(alterBitmap);

}

}

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