Question

我无法获得位图内容周围的边界，我如何获得内容边界，下面的代码只能给我图像周围的边界，而不是内容。

  mPaint.setStyle(Paint.Style.STROKE);
    mPaint.setStrokeWidth(10); // set stroke width
    mPaint.setColor(getResources().getColor(R.color.black)); // set stroke color
    mPaint.setAntiAlias(true);
    bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.icons8_bus_36_2);
    tempBitmap = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Bitmap.Config.ARGB_8888);
    Canvas tempCanvas = new Canvas(tempBitmap);
    Rect rect = new Rect(
            10 / 2,
            10 / 2,
            tempCanvas.getWidth() - 10 / 2,
            tempCanvas.getHeight() - 10 / 2);
    tempCanvas.drawRect(rect,mPaint);
    tempCanvas.drawBitmap(bitmap, 0, 0, mPaint);

Answer 1

在这部分上：

redirectSub: Subscription;

constructor(
  private store: Store<fromRoot.State>,
  private router: Router,
  private actionsSubject: ActionsSubject
) { }


ngOnInit() {
  this.redirectSub = this.actionsSubject.asObservable().pipe(
    ofType(ContactsActionTypes.CREATE_SUCCESS)
  ).subscribe(
    (action: CreateSuccess) => this.router.navigate(['/contacts', action.payload.id])
  );
}

ngOnDestroy() {
  this.redirectSub.unsubscribe();
}

submitted(subspecialisatie: SubSpecialisatie) {
  this.store.dispatch(new Create(subspecialisatie));
}




@Effect()
create$: Observable<Action> = this.actions$.pipe(
ofType(SubSpecialisatiesActionTypes.CREATE),
map((action: Create) => action.payload),
switchMap((subspecialisatie) => this.subspecialisatieService.createSubSpecialisatie(subspecialisatie)),
map((createdSubSpecialisatie: SubSpecialisatie) => new CreateSuccess(createdSubSpecialisatie))
);

更改为

Rect rect = new Rect(
            10 / 2,
            10 / 2,
            tempCanvas.getWidth() - 10 / 2,
            tempCanvas.getHeight() - 10 / 2);

那是因为10先除以两个

另外，在绘制矩形之前先绘制位图

OR

您可以这样绘制：

Rect rect = new Rect(
            10 / 2,
            10 / 2,
            (tempCanvas.getWidth() - 10) / 2,
            (tempCanvas.getHeight() - 10) / 2);

如何获得位图内容周围的边框？

1 个答案: