def __get_bezier_middle(self, bezier: QPainterPath) -> QPointF:
"""
Get the point in the middle of a bezier curve.
"""
percent_middle = bezier.percentAtLength(
bezier.length() / 2)
return bezier.pointAtPercent(percent_middle)
def __get_bezier_middle_angle(self, bezier: QPainterPath):
"""
Get the angle in the middle of a bezier curve.
"""
percent_middle = bezier.percentAtLength(
bezier.length() / 2)
return -math.radians(
bezier.angleAtPercent(percent_middle))
def count_perimeter(outline_path: QPainterPath, ratio: int = 1) -> float:
"""
:param outline_path: 轮廓的像素的矩阵
:param ratio: 图像的分辨率 以米为单位
:return: float类型的面积
"""
percent = QPainterPath.percentAtLength(outline_path, 1000)
length = 1000 / percent * ratio
return length