Question

java Paint 랑 Touch에 관해서 공부중인데요. 라인이 일정범위를 아예 못벗어나게 하는 법을 모르겠습니다.

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public class CropImage extends ImageView {           private static final String TAG = "Crop_Image";     float sx, ex, sy, ey;     static int DEP = 50; // Crop 경계선의 유효폭(선근처)             ContentResolver mContentResolver;     ImageCropActivity cnxt;     Bitmap bitmap;     float mWidth , bitWidth;     float mHeight , bitHeight;     Paint pnt;       Bitmap hBmp; // 선 가운데의 세로선택 아이콘     Bitmap wBmp; // 가로     Bitmap LTP,RTP,LBP,RBP;     Bitmap tmp;         private String outFilePath = FileUtil.getStrFilePath();             public CropImage(Context context, AttributeSet attr) {         super(context, attr);                   String ver = Build.VERSION.RELEASE;                   if(Integer.valueOf(ver.charAt(0)) < 3 || ver.substring(0,2).equals("3.1")){                       }else{             Display display = ((WindowManager) context.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();             Point point = new Point();             display.getSize(point);             mWidth  = point.x;             mHeight = point.y;         }           //      sx = mWidth / 5; // 초기s Crop선의 위치 설정 //      ex = mWidth * 4 / 5; //      sy = mHeight / 5; //      ey = mHeight * 4 / 5;                     //      sx = mWidth; //      ex = mWidth; //      sy = mHeight; //      ey = mHeight;           Log.e(TAG, outFilePath);         cnxt = (ImageCropActivity) context;           // 비트맵 크기 조절(메모리 문제로 인하여 1/2 크기로)         BitmapFactory.Options resizeOpts = new Options();         resizeOpts.inSampleSize = 2;         try {             bitmap = BitmapFactory.decodeStream(                     new FileInputStream(outFilePath), null, resizeOpts);                       } catch (Exception e) {             e.printStackTrace();         }                   bitmap = BitmapUtil.resizeBitmap(bitmap, (int)mWidth);         bitWidth    = bitmap.getWidth();         bitHeight   = bitmap.getHeight(); //      if(bitHeight > bitWidth){ //          bitmap = BitmapUtil.resizeBitmap(bitmap, (int)mHeight); //      }else{ //          //      }                   Log.e(TAG, "" + bitHeight * bitWidth);           //      hBmp = BitmapFactory.decodeResource(getContext().getResources(), R.drawable.shape); //      wBmp = BitmapFactory.decodeResource(getContext().getResources(), R.drawable.shape);         LTP = BitmapFactory.decodeResource(getContext().getResources(), R.drawable.circle);         LBP = BitmapFactory.decodeResource(getContext().getResources(), R.drawable.circle);         RTP = BitmapFactory.decodeResource(getContext().getResources(), R.drawable.circle);         RBP = BitmapFactory.decodeResource(getContext().getResources(), R.drawable.circle);           if(bitWidth > bitHeight){             sx = mWidth * 0; // 초기s Crop선의 위치 설정             ex = bitWidth;             sy = mHeight/7;             ey = bitHeight + mHeight/7;         }else{             sx = (mWidth - bitWidth)/2; // 초기s Crop선의 위치 설정             ex = (mWidth - bitWidth)/2 + bitWidth;             sy = mHeight/20;             ey = bitHeight + mHeight/20;            }                   Log.d("크기","mwidth :" + mWidth + " mHeight : " + mHeight + "sx : " + sx + " ex : " + ex + " sy : " + sy + " ey :" + ey);                     // 페인트 설정         pnt = new Paint();         pnt.setColor(Color.WHITE);         pnt.setStrokeWidth(3);     }       public void onDraw(Canvas canvas) {         // 사각형 라인 그리기         canvas.drawBitmap(bitmap, mHeight-bitHeight/2, mWidth-bitWidth/2, null);                   if(bitWidth > bitHeight){             canvas.drawBitmap(bitmap, 0 , mHeight/7 , null);         }else{             canvas.drawBitmap(bitmap, ((mWidth - bitWidth)/2) , mHeight/20 , null);         }                   canvas.drawLine(sx, sy, ex, sy, pnt); //      canvas.drawLine(0, 0, mWidth, 0, pnt);      // 왼쪽 위 점 -> 오른쪽 위 점           canvas.drawLine(ex, sy, ex, ey, pnt); //      canvas.drawLine(mWidth, 0, mWidth, mHeight , pnt);          // 오른쪽 위 점 -> 오른쪽 아래 점                   canvas.drawLine(sx, sy, sx, ey, pnt); //      canvas.drawLine(0, 0, 0, mHeight, pnt);         //  시작 점    -> 왼쪽 아래점                   canvas.drawLine(sx, ey, ex, ey, pnt); //      canvas.drawLine(0, mHeight, mWidth, mHeight, pnt);          //  왼쪽 아래 점 - > 오른쪽 아래점                             canvas.drawBitmap(LTP, sx-30, sy-30, null); // 왼쪽 위         canvas.drawBitmap(RTP, ex-30, sy-30, null);// 오른쪽위         canvas.drawBitmap(LBP, sx-30, ey-30, null);// 완쪽 아래         canvas.drawBitmap(RBP, ex-30, ey-30, null);// 오른쪽 아래                   // 상하좌우 버튼들 //      canvas.drawBitmap(hBmp, (ex + sx) / 2 - 19, sy - 19, null); // 폭이 38이므로 //      canvas.drawBitmap(hBmp, (ex + sx) / 2 - 19, ey - 19, null); //      canvas.drawBitmap(wBmp, sx - 19, (ey + sy) / 2 - 19, null); //      canvas.drawBitmap(wBmp, ex - 19, (ey + sy) / 2 - 19, null);     }       // 이벤트 처리, 현재의 그리기 모드에 따른 점의 위치를 조정     float dx = 0, dy = 0;     float oldx, oldy;     boolean bsx, bsy, bex, bey;     boolean bMove = false;       public boolean onTouchEvent(MotionEvent e) {         int x = (int) e.getX();         int y = (int) e.getY();           if (e.getAction() == MotionEvent.ACTION_DOWN) {             oldx = x;             oldy = y;               // 눌려진곳이 선 근처인가 확인             if ((x > sx - DEP) && (x < sx + DEP))                 bsx = true;             else if ((x > ex - DEP) && (x < ex + DEP))                 bex = true;               if ((y > sy - DEP) && (y < sy + DEP))                 bsy = true;             else if ((y > ey - DEP) && (y < ey + DEP))                 bey = true;               // 어느 하나라도 선택이 되었다면 move에서 값 변경             if ((bsx || bex || bsy || bey))                 bMove = false;             else if (((x > sx + DEP) && (x < ex - DEP))                     && ((y > sy + DEP) && (y < ey - DEP)))                 bMove = true;               return true;         }           if (e.getAction() == MotionEvent.ACTION_MOVE) {             if (bsx)                 sx = x;             if (bex)                 ex = x;             if (bsy)                 sy = y;             if (bey)                 ey = y;               // 사각형의 시작 라인보다 끝라인이 크지않게 처리             if (ex <= sx + DEP) {                 ex = sx + DEP;                 return true;             }             if (ey <= sy + DEP) {                 ey = sy + DEP;                 return true;             }                           // 움직인 거리 구해서 적용             if (bMove) {                                   dx = oldx - x;                 dy = oldy - y;                   sx -= dx;                 ex -= dx;                 sy -= dy;                 ey -= dy;                                   // 화면밖으로 나가지않게 처리                 if (bitWidth>bitHeight? sx <= 0 : sx <= (mWidth - bitWidth)/2)                     sx = bitWidth > bitHeight ? 0 : (mWidth - bitWidth)/2;                 if (bitWidth>bitHeight ? ex >= mWidth : ex >= (mWidth - bitWidth)/2 + bitWidth)                     ex = bitWidth > bitHeight ? mWidth - 1 : (mWidth - bitWidth)/2 + bitWidth;                 if (bitWidth>bitHeight ?sy <= mHeight/7 : sy <= mHeight/20)                     sy = bitWidth>bitHeight ? mHeight/7 : mHeight/20;                 if (bitWidth>bitHeight ? ey >= bitHeight + mHeight/7 : ey >= bitHeight + mHeight/20)                     ey = bitWidth>bitHeight ? bitHeight + mHeight/7 - 1 : bitHeight + mHeight/20 -1;             }               invalidate(); // 움직일때 다시 그려줌             oldx = x;             oldy = y;             return true;         }           // ACTION_UP 이면 그리기 종료         if (e.getAction() == MotionEvent.ACTION_UP) {             bsx = bex = bsy = bey = bMove = false;             return true;         }         return false;     }       // 선택된 사각형의 이미지를 저장     public void save() {         try {             if(bitWidth > bitHeight){                 tmp = Bitmap.createBitmap(bitmap, (int) (sx * 0), (int) (sy-mHeight/7),                         (int) (ex - sx), (int) (ey - sy));             }else{                 tmp = Bitmap.createBitmap(bitmap, (int) (sx - (mWidth - bitWidth)/2), (int) (sy-mHeight/20),                         (int) (ex - sx), (int) (ey - sy));             }         } catch (IllegalArgumentException e) {             DefaultErrorHandler.handleError(getContext(), e , "자르는 선 안쪽으로 배치시켜주세요.");         }             byte[] byteArray = bitmapToByteArray(tmp);             File file = new File(outFilePath);                           try {                 FileOutputStream fos = new FileOutputStream(file);                 fos.write(byteArray);                 fos.flush();                 fos.close();             } catch (Exception e) {                 Toast.makeText(cnxt, "파일 저장 중 에러 발생 : " + e.getMessage(), 0).show();                 return;             }     }       // 이미지를 전송하기위한 테스트 코드     public byte[] bitmapToByteArray(Bitmap bitmap) {         ByteArrayOutputStream stream = new ByteArrayOutputStream();         bitmap.compress(CompressFormat.JPEG, 100, stream);         byte[] byteArray = stream.toByteArray();         return byteArray;     } }