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357
app/src/main/java/imageselector/view/ClipImageView.java
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357
app/src/main/java/imageselector/view/ClipImageView.java
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package imageselector.view;
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import android.content.Context;
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import android.graphics.Bitmap;
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import android.graphics.Canvas;
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import android.graphics.Color;
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import android.graphics.Matrix;
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import android.graphics.Paint;
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import android.graphics.PointF;
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import android.graphics.PorterDuff;
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import android.graphics.PorterDuffXfermode;
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import android.graphics.Rect;
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import android.graphics.RectF;
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import android.graphics.Xfermode;
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import android.support.v7.widget.AppCompatImageView;
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import android.util.AttributeSet;
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import android.util.DisplayMetrics;
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import android.view.MotionEvent;
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import android.view.WindowManager;
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public class ClipImageView extends AppCompatImageView {
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private PointF mDownPoint;
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private PointF mMiddlePoint;
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private Matrix mMatrix;
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private Matrix mTempMatrix;
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private int mBitmapWidth;
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private int mBitmapHeight;
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private final int MODE_NONE = 0;
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private final int MODE_DRAG = 1;
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private final int MODE_ZOOM = 2;
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private final int MODE_POINTER_UP = 3;
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private int CURR_MODE = MODE_NONE;
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private float mLastDistance;
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private Paint mFrontGroundPaint = new Paint();
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private int mTargetWidth;
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private int mTargetHeight;
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private Xfermode mXfermode;
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private Rect r;
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private RectF rf;
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private float mCircleCenterX, mCircleCenterY;
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private float mCircleX, mCircleY;
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private boolean isCutImage;
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public ClipImageView(Context context) {
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super(context);
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setRadius();
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}
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public ClipImageView(Context context, AttributeSet attrs) {
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super(context, attrs);
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setRadius();
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}
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/**
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* 设置要剪裁的图片
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*
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* @param bitmap
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*/
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public void setBitmapData(Bitmap bitmap) {
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if (bitmap == null) {
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return;
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}
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mBitmapHeight = bitmap.getHeight();
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mBitmapWidth = bitmap.getWidth();
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setImageBitmap(bitmap);
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init();
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}
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private void init() {
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mDownPoint = new PointF();
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mMiddlePoint = new PointF();
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mMatrix = new Matrix();
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mTempMatrix = new Matrix();
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mFrontGroundPaint.setColor(Color.parseColor("#ac000000"));
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mFrontGroundPaint.setAntiAlias(true);
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mXfermode = new PorterDuffXfermode(PorterDuff.Mode.DST_OUT);
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setScaleType(ScaleType.MATRIX);
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post(new Runnable() {
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@Override
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public void run() {
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center();
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}
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});
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}
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@Override
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protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
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super.onLayout(changed, left, top, right, bottom);
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mCircleCenterX = getWidth() / 2;
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mCircleCenterY = getHeight() / 2;
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mCircleX = mCircleCenterX - mTargetWidth / 2;
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mCircleY = mCircleCenterY - mTargetHeight / 2;
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}
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private void setRadius() {
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int width = getScreenWidth(getContext());
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int height = getScreenHeight(getContext());
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if (width > height) {
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mTargetWidth = height;
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mTargetHeight = height;
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} else {
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mTargetWidth = width;
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mTargetHeight = width;
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}
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}
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@Override
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protected void onDraw(Canvas canvas) {
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super.onDraw(canvas);
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if (isCutImage) {
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return;
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}
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if (rf == null || rf.isEmpty()) {
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r = new Rect(0, 0, getWidth(), getHeight());
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rf = new RectF(r);
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}
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// 画入前景圆形蒙板层
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int sc = canvas.saveLayer(rf, null, Canvas.MATRIX_SAVE_FLAG
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| Canvas.CLIP_SAVE_FLAG | Canvas.HAS_ALPHA_LAYER_SAVE_FLAG
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| Canvas.FULL_COLOR_LAYER_SAVE_FLAG
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| Canvas.CLIP_TO_LAYER_SAVE_FLAG | Canvas.ALL_SAVE_FLAG);
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//画入矩形黑色半透明蒙板层
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canvas.drawRect(r, mFrontGroundPaint);
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//设置Xfermode，目的是为了去除矩形黑色半透明蒙板层和圆形的相交部分
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mFrontGroundPaint.setXfermode(mXfermode);
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//画入正方形
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canvas.drawRect(mCircleCenterX - mTargetWidth / 2, mCircleCenterY - mTargetHeight / 2,
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mCircleCenterX + mTargetWidth / 2, mCircleCenterY + mTargetHeight / 2, mFrontGroundPaint);
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canvas.restoreToCount(sc);
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//清除Xfermode，防止影响下次画图
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mFrontGroundPaint.setXfermode(null);
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}
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/**
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* 截取Bitmap
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*
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* @return
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*/
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public Bitmap clipImage() {
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isCutImage = true;
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Paint paint = new Paint();
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setDrawingCacheEnabled(true);
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Bitmap bitmap = getDrawingCache();
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Bitmap targetBitmap = Bitmap.createBitmap(mTargetWidth, mTargetHeight,
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Bitmap.Config.ARGB_8888);
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Canvas canvas = new Canvas(targetBitmap);
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RectF dst = new RectF(-bitmap.getWidth() / 2 + mTargetWidth / 2, -getHeight()
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/ 2 + mTargetHeight / 2, bitmap.getWidth() / 2
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+ mTargetWidth / 2, getHeight() / 2 + mTargetHeight / 2);
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canvas.drawBitmap(bitmap, null, dst, paint);
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setDrawingCacheEnabled(false);
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bitmap.recycle();
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bitmap = null;
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isCutImage = false;
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//返回正方形图片
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return targetBitmap;
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}
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@Override
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public boolean onTouchEvent(MotionEvent event) {
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if (mMatrix == null) {
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return super.onTouchEvent(event);
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}
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float[] values = new float[9];
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mMatrix.getValues(values);
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float left = values[Matrix.MTRANS_X];
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float top = values[Matrix.MTRANS_Y];
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float right = (left + mBitmapWidth * values[Matrix.MSCALE_X]);
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float bottom = (top + mBitmapHeight * values[Matrix.MSCALE_Y]);
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float x = 0f;
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float y = 0f;
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switch (event.getAction() & MotionEvent.ACTION_MASK) {
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case MotionEvent.ACTION_DOWN:
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CURR_MODE = MODE_DRAG;
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mDownPoint.set(event.getX(), event.getY());
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break;
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case MotionEvent.ACTION_POINTER_DOWN:
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if (getDistance(event) > 10f) {
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CURR_MODE = MODE_ZOOM;
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midPoint(mMiddlePoint, event);
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mLastDistance = getDistance(event);
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}
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break;
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case MotionEvent.ACTION_MOVE:
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//如果当前模式为拖曳（单指触屏）
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if (CURR_MODE == MODE_DRAG || CURR_MODE == MODE_POINTER_UP) {
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if (CURR_MODE == MODE_DRAG) {
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x = event.getX() - mDownPoint.x;
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y = event.getY() - mDownPoint.y;
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//left靠边
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if (x + left > mCircleX) {
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x = 0;
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}
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//right靠边
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if (x + right < mCircleX + mTargetWidth) {
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x = 0;
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}
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//top靠边
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if (y + top > mCircleY) {
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y = 0;
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}
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//bottom靠边
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if (y + bottom < mCircleY + mTargetHeight) {
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y = 0;
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}
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mMatrix.postTranslate(x, y);
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mDownPoint.set(event.getX(), event.getY());
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} else {
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CURR_MODE = MODE_DRAG;
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mDownPoint.set(event.getX(), event.getY());
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}
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} else {
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//否则当前模式为缩放（双指触屏）
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float distance = getDistance(event);
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if (distance > 10f) {
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float scale = distance / mLastDistance;
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//left靠边
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if (left >= mCircleX) {
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mMiddlePoint.x = 0;
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}
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//right靠边
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if (right <= mCircleX + mTargetWidth) {
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mMiddlePoint.x = right;
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}
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//top靠边
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if (top >= mCircleY) {
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mMiddlePoint.y = 0;
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}
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//bottom靠边
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if (bottom <= mCircleY + mTargetHeight) {
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mMiddlePoint.y = bottom;
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}
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mTempMatrix.set(mMatrix);
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mTempMatrix.postScale(scale, scale, mMiddlePoint.x, mMiddlePoint.y);
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float[] temp_values = new float[9];
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mTempMatrix.getValues(temp_values);
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float temp_left = temp_values[Matrix.MTRANS_X];
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float temp_top = temp_values[Matrix.MTRANS_Y];
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float temp_right = (temp_left + mBitmapWidth * temp_values[Matrix.MSCALE_X]);
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float temp_bottom = (temp_top + mBitmapHeight * temp_values[Matrix.MSCALE_Y]);
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//靠边预判断
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if (temp_left > mCircleX || temp_right < mCircleX + mTargetWidth ||
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temp_top > mCircleY || temp_bottom < mCircleY + mTargetHeight) {
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return true;
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}
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mMatrix.postScale(scale, scale, mMiddlePoint.x, mMiddlePoint.y);
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mLastDistance = getDistance(event);
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}
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}
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break;
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case MotionEvent.ACTION_UP:
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CURR_MODE = MODE_NONE;
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break;
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case MotionEvent.ACTION_POINTER_UP:
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CURR_MODE = MODE_POINTER_UP;
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break;
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}
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setImageMatrix(mMatrix);
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return true;
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}
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/**
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* 两点的距离
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*/
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private float getDistance(MotionEvent event) {
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float x = event.getX(0) - event.getX(1);
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float y = event.getY(0) - event.getY(1);
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return (float) Math.sqrt(x * x + y * y);
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}
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/**
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* 两点的中点
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*/
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private void midPoint(PointF point, MotionEvent event) {
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float x = event.getX(0) + event.getX(1);
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float y = event.getY(0) + event.getY(1);
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point.set(x / 2, y / 2);
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}
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/**
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* 横向、纵向居中
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*/
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protected void center() {
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float height = mBitmapHeight;
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float width = mBitmapWidth;
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float screenWidth = getWidth();
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float screenHeight = getHeight();
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float scale = 1f;
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if (width >= height) {
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scale = screenWidth / width;
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if (scale * height < mTargetHeight) {
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scale = mTargetHeight / height;
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}
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} else {
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if (height <= screenHeight) {
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scale = screenWidth / width;
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} else {
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scale = screenHeight / height;
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}
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if (scale * width < mTargetWidth) {
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scale = mTargetWidth / width;
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}
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}
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float deltaX = (screenWidth - width * scale) / 2f;
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float deltaY = (screenHeight - height * scale) / 2f;
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mMatrix.postScale(scale, scale);
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mMatrix.postTranslate(deltaX, deltaY);
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setImageMatrix(mMatrix);
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}
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/**
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* 获得屏幕宽度
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*/
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public static int getScreenWidth(Context context) {
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WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
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DisplayMetrics outMetrics = new DisplayMetrics();
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wm.getDefaultDisplay().getMetrics(outMetrics);
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return outMetrics.widthPixels;
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}
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/**
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* 获得屏幕高度
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*/
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public static int getScreenHeight(Context context) {
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WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
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DisplayMetrics outMetrics = new DisplayMetrics();
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wm.getDefaultDisplay().getMetrics(outMetrics);
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return outMetrics.heightPixels;
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}
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}
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