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Android图片旋转,缩放,位移,倾斜,对称完整示例(二)——Bitmap.createBitmap()和Matrix

2024-07-07 05:27:48   223人阅读

MainActivity如下:
package cc.c;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Matrix;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.widget.ImageView;
/**
 * Demo描述:
 * 利用Bitmap.createBitmap()和Matrix实现图像
 * 的旋转,缩放,位移,倾斜.
 * 该方式的作用和mImageView.setImageMatrix(matrix);
 * 是一样的
 * 
 * 备注说明:
 * 利用Bitmap.createBitmap()和Matrix的方式没有实现图像
 * 关于X轴,Y轴和XY的对称.
 * 明白怎么实现的coder请指点,多谢.
 *
 */
public class MainActivity extends Activity {
	private Bitmap mBitmap;
	private Bitmap mNewBitmap;
	private ImageView mImageView;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        init();
    }
    
    private void init(){
    	mImageView=(ImageView) findViewById(R.id.imageView);
    	mImageView.setScaleType(ImageView.ScaleType.MATRIX);
    	 
    	BitmapDrawable bitmapDrawable=(BitmapDrawable) mImageView.getDrawable();
    	mBitmap=bitmapDrawable.getBitmap();
    	
    	//平移的两种方式,效果一致
    	//testTranslate1(mBitmap);
    	testTranslate2(mBitmap);

    	//围绕图片中心点旋转且位移的两种方式,效果一致
    	//testRotate1(mBitmap);
    	//testRotate2(mBitmap);
    	
    	//围绕原点旋转后平移的两种方式,效果一致
    	//testRotateAndTranslate1(mBitmap);
    	//testRotateAndTranslate2(mBitmap);
    	
    	//测试缩放的两种方式,效果一致
    	//testScale1();
    	//testScale2(mBitmap);
    	
    	//测试倾斜各两种方式,效果一致
    	//testSkewX1();
    	//testSkewX2(mBitmap);
    	//testSkewY1();
    	//testSkewY2(mBitmap);
    	//testSkewXY1();
    	//testSkewXY2(mBitmap);
    	
    	//测试对称
    	//testSymmetryX(mBitmap);
    	//testSymmetryY(mBitmap);
    	//testSymmetryXY(mBitmap);
    }
    
    
    
    //平移的方式一
	private void testTranslate1(Bitmap bitmap){
		Matrix matrix=new Matrix();
		int width=bitmap.getWidth();
		int height=bitmap.getHeight();
		matrix.postTranslate(width, height);
		mImageView.setImageMatrix(matrix);
	}
	
	
    //平移的方式二
	private void testTranslate2(Bitmap bitmap){
		Matrix matrix=mImageView.getImageMatrix();
		int width=bitmap.getWidth();
		int height=bitmap.getHeight();
		matrix.postTranslate(width, height);
		mNewBitmap=Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, false);
    	mImageView.setImageBitmap(mNewBitmap);
	}
	
	
	//围绕图片中心点旋转且位移的方式一
	private void testRotate1(Bitmap bitmap){
		Matrix matrix=new Matrix();
		int width=bitmap.getWidth();
		int height=bitmap.getHeight();
		matrix.postRotate(45f, width/2, height/2);
		matrix.postTranslate(width, height);
		mImageView.setImageMatrix(matrix);
	}
	
	//围绕图片中心点旋转且位移的方式二
	//注意问题:
	//在方式一种旋转45°采用matrix.postRotate(45f, width/2, height/2);即可
	//但在方式二中只需旋转22.5度matrix.postRotate(45/2f, width/2, height/2);
	private void testRotate2(Bitmap bitmap){
		Matrix matrix=mImageView.getImageMatrix();
		int width=bitmap.getWidth();
		int height=bitmap.getHeight();
		matrix.postRotate(45/2f, width/2, height/2);
		matrix.postTranslate(width, height);
		mNewBitmap=Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, false);
		mImageView.setImageBitmap(mNewBitmap);
	}
	
	
	//围绕原点旋转后平移的方式一
	private void testRotateAndTranslate1(Bitmap bitmap) {
		Matrix matrix = new Matrix();
		int width =bitmap.getWidth();
		int height = bitmap.getHeight();
		matrix.setRotate(45f);
		matrix.postTranslate(width, height);
		mImageView.setImageMatrix(matrix);
	}
	
	
	
	//围绕原点旋转后平移的方式二
	//注意问题:
	//同上
	private void testRotateAndTranslate2(Bitmap bitmap) {
		Matrix matrix = mImageView.getImageMatrix();
		int width =bitmap.getWidth();
		int height = bitmap.getHeight();
		matrix.setRotate(45/2f);
		matrix.postTranslate(width, height);
		mNewBitmap=Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, false);
    	mImageView.setImageBitmap(mNewBitmap);
	}
	
	
	
	
	//缩放的方式一
	private void testScale1() {
		Matrix matrix = new Matrix();
		matrix.setScale(0.5f, 0.5f);
		mImageView.setImageMatrix(matrix);
	}
	
	//缩放的方式二
	private void testScale2(Bitmap bitmap) {
		Matrix matrix = new Matrix();
		int width =bitmap.getWidth();
		int height = bitmap.getHeight();
		matrix.setScale(0.5f, 0.5f);
		mNewBitmap=Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, false);
    	mImageView.setImageBitmap(mNewBitmap);
	}
	
	//水平倾斜的方式一
	private void testSkewX1() {
		Matrix matrix = new Matrix();
		matrix.setSkew(0.5f, 0);
		mImageView.setImageMatrix(matrix);
	}
	
	//水平倾斜的方式二
	private void testSkewX2(Bitmap bitmap) {
		Matrix matrix = new Matrix();
		int width =bitmap.getWidth();
		int height = bitmap.getHeight();
		matrix.setSkew(0.5f, 0);
		mNewBitmap=Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, false);
    	mImageView.setImageBitmap(mNewBitmap);
	}

	// 垂直倾斜的方式一
	private void testSkewY1() {
		Matrix matrix = new Matrix();
		matrix.setSkew(0, 0.5f);
		mImageView.setImageMatrix(matrix);
	}
	
	// 垂直倾斜的方式二
	private void testSkewY2(Bitmap bitmap) {
		Matrix matrix = new Matrix();
		int width =bitmap.getWidth();
		int height = bitmap.getHeight();
		matrix.setSkew(0, 0.5f);
		mNewBitmap=Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, false);
    	mImageView.setImageBitmap(mNewBitmap);
	}
	
	// 水平且垂直倾斜的方式一
	private void testSkewXY1() {
		Matrix matrix = new Matrix();
		matrix.setSkew(0.5f, 0.5f);
		mImageView.setImageMatrix(matrix);
	}
	
	// 水平且垂直倾斜的方式二
	private void testSkewXY2(Bitmap bitmap) {
		Matrix matrix = new Matrix();
		int width =bitmap.getWidth();
		int height = bitmap.getHeight();
		matrix.setSkew(0.5f, 0.5f);
		mNewBitmap=Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, false);
    	mImageView.setImageBitmap(mNewBitmap);
	}
	
	
	
	// 水平对称--图片关于X轴对称
	private void testSymmetryX(Bitmap bitmap) {
		Matrix matrix = new Matrix();
		int height =bitmap.getHeight();
		float matrixValues[] = { 1f, 0f, 0f, 0f, -1f, 0f, 0f, 0f, 1f };
		matrix.setValues(matrixValues);
		//若是matrix.postTranslate(0, height);//表示将图片上下倒置
		matrix.postTranslate(0, height*2);
		mImageView.setImageMatrix(matrix);
	}
	

		
	
	// 垂直对称--图片关于Y轴对
	private void testSymmetryY(Bitmap bitmap) {
		Matrix matrix = new Matrix();
		int width=bitmap.getWidth();
		float matrixValues[] = {-1f, 0f, 0f, 0f, 1f, 0f, 0f, 0f, 1f};
		matrix.setValues(matrixValues);
		//若是matrix.postTranslate(width,0);//表示将图片左右倒置
		matrix.postTranslate(width*2, 0);
    	mImageView.setImageMatrix(matrix);
	}
	

	// 关于X=Y对称
	private void testSymmetryXY(Bitmap bitmap) {
		Matrix matrix = new Matrix();
		int width = bitmap.getWidth();
		int height = bitmap.getHeight();
		float matrixValues[] = { 0f, -1f, 0f, -1f, 0f, 0f, 0f, 0f, 1f };
		matrix.setValues(matrixValues);
		matrix.postTranslate(width+height, width+height);
		mImageView.setImageMatrix(matrix);
	}
	
    
}

main.xml如下:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:src=http://www.mamicode.com/"@drawable/a">


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