Android图像处理（三）通过矩阵变换实现图像变形特效

图像色彩变化----矩阵法和像素点法

图像变换----矩阵法与像素块法

图像变换----画笔风格法

矩阵变换

|A B C|

|D E F|

|G H I |

A、E控制缩放

C、F控制平移

B、D控制错切

在onCreate中无法获取宽高

ImageMatrixView.java

public class ImageMatrixView extends View {    private Bitmap mBitmap;    private Matrix mMatrix;    public ImageMatrixView(Context context) {        super(context);        initView();    }    public ImageMatrixView(Context context, AttributeSet attrs) {        super(context, attrs);        initView();    }    public ImageMatrixView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        initView();    }    private void initView() {        mBitmap = BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher);        setImageMatrix(new Matrix());    }    public void setImageMatrix(Matrix matrix) {        mMatrix = matrix;    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        //原图        canvas.drawBitmap(mBitmap, 0, 0, null);        //对比图        canvas.drawBitmap(mBitmap, mMatrix, null);    }}

matrix.xml

<?xml version="1.0" encoding="utf-8"?>

矩阵变换----Android API

matrix.setRotate()----旋转

matrix.setTranslate()----平移

matrix.setScale()----缩放

matrix.setSkew()----错切

post----矩阵组合

ImageMatrixTest.java

public class ImageMatrixTest extends Activity {    private GridLayout mGridLayout;    private ImageMatrixView mImageMatrixView;    private int mEdWidth;    private int mEdHeight;    private float[] mImageMatrix = new float[9];    private EditText[] mEts = new EditText[9];    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.matrix);        mImageMatrixView = (ImageMatrixView) findViewById(R.id.view);        mGridLayout = (GridLayout) findViewById(R.id.grid_group);        mGridLayout.post(new Runnable() {            @Override            public void run() {                mEdWidth = mGridLayout.getWidth() / 3;                mEdHeight = mGridLayout.getHeight() / 3;                addEts();                initImageMatrix();            }        });    }    private void addEts() {        for (int i = 0; i < 9; i++) {            EditText et = new EditText(ImageMatrixTest.this);            //居中显示            et.setGravity(Gravity.CENTER);            mEts[i] = et;            mGridLayout.addView(et, mEdWidth, mEdHeight);        }    }    /**     * 初始矩阵     * 1 0 0     * 0 1 0     * 0 0 1     */    private void initImageMatrix() {        for (int i = 0; i < 9; i++) {            if (i % 4 == 0) {                mEts[i].setText(String.valueOf(1));            } else {                mEts[i].setText(String.valueOf(0));            }        }    }    private void getImageMatrix() {        for (int i = 0; i < 9; i++) {            EditText ed = mEts[i];            mImageMatrix[i] = Float.parseFloat(ed.getText().toString());        }    }    public void change(View view) {        getImageMatrix();        Matrix matrix = new Matrix();//        matrix.setValues(mImageMatrix);//        //X轴偏移量，Y轴偏移量//        matrix.setTranslate(150, 150);        matrix.setScale(2, 2);        matrix.postTranslate(200, 200);        //矩阵先乘和后乘是不一样的        mImageMatrixView.setImageMatrix(matrix);        mImageMatrixView.invalidate();    }    public void reset(View view) {        initImageMatrix();        getImageMatrix();        Matrix matrix = new Matrix();        matrix.setValues(mImageMatrix);        mImageMatrixView.setImageMatrix(matrix);        mImageMatrixView.invalidate();    }}

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