/**
 * Created by MandyLu on 2018/7/14.
 * 圓形裁剪框
 */
public class CircleCropView extends View {
 public final int CIRCLE_MARGIN = 50;

 public CircleCropView(Context context) {
 super(context);
 }

 public CircleCropView(Context context, @Nullable AttributeSet attrs) {
 super(context, attrs);
 }

 public CircleCropView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
 super(context, attrs, defStyleAttr);
 }

 @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
 public CircleCropView(Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) {
 super(context, attrs, defStyleAttr, defStyleRes);
 }

 @Override
 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
 super.onMeasure(widthMeasureSpec, widthMeasureSpec);
 }

 @RequiresApi(api = Build.VERSION_CODES.O)
 @Override
 protected void onDraw(Canvas canvas) {
 canvas.save();

 Path path = new Path();
 Rect viewDrawingRect = new Rect();
 getDrawingRect(viewDrawingRect);

 float radius = viewDrawingRect.width() / 2 - CIRCLE_MARGIN;
 path.addCircle(viewDrawingRect.left + radius + CIRCLE_MARGIN,
 viewDrawingRect.top + radius + CIRCLE_MARGIN, radius, Path.Direction.CW);

 Paint outsidePaint = new Paint();
 outsidePaint.setAntiAlias(true);
 outsidePaint.setARGB(151, 0, 0, 0);

 canvas.clipPath(path, Region.Op.DIFFERENCE);
 canvas.drawRect(viewDrawingRect, outsidePaint);
 canvas.restore();
 }
}

 @Override
 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
 super.onMeasure(widthMeasureSpec, widthMeasureSpec);
 }

fun cropImage(){
 var degree = ImageUtils.readPictureDegree(imagePath)
 var bitmap = ImageUtils.getRotatedBitmap(BitmapFactory.decodeFile(imagePath),degree)

 var width: Int = 0
 var startX: Int = 0
 var startY: Int = 0
 if (bitmap.width < bitmap.height){
 startY = (bitmap.height - bitmap.width) / 2
 width = bitmap.width
 }else{
 startX = (bitmap.width - bitmap.height) / 2
 width = bitmap.height
 }

 var matrix = Matrix()
 photo_preview.getDisplayMatrix(matrix)//獲取變形矩陣，直接取scaleX或translationX沒用
 var values = FloatArray(9, {0.0f})
 matrix.getValues(values)

 var expWidth = Math.round(bitmap.width * values[0])//縮放x
 var expHeight = Math.round(bitmap.height * values[4])//縮放y
 
 var bitmap1 = Bitmap.createScaledBitmap(bitmap, expWidth, expHeight, false)

 val ratio = width * 1.0f / photo_preview.width
 startX = Math.round(startX * values[0] - values[2] * ratio)
 startY = Math.round(startY * values[4] - values[5] * ratio)
 var bitmap2 = Bitmap.createBitmap(bitmap1, startX, startY, width, width, null, false)

 saveImage(bitmap2)
 }

var startX: Int = 0
 var startY: Int = 0
 if (bitmap.width < bitmap.height){
 startY = (bitmap.height - bitmap.width) / 2
 width = bitmap.width
 }else{
 startX = (bitmap.width - bitmap.height) / 2
 width = bitmap.height
 }