| import numpy as np | |
| import math | |
| from geometry.curve import Curve | |
| class Arc(Curve): | |
| def __init__(self, point_indices, point_data, is_outer): | |
| assert len(point_indices) == 4, "Arc must be defined by 3 points" | |
| assert point_data is not None | |
| super(Arc, self).__init__(point_indices, point_data) | |
| self.type = 'arc' | |
| self.is_outer = is_outer | |
| self.start = self.point_geom[0, :] | |
| self.mid = self.point_geom[1, :] | |
| self.center = self.point_geom[2, :] | |
| self.end = self.point_geom[3, :] | |
| self.r1 = math.sqrt( (self.start[0] - self.center[0])**2 + (self.start[1] - self.center[1])**2 ) | |
| self.r2 = math.sqrt( (self.end[0] - self.center[0])**2 + (self.end[1] - self.center[1])**2 ) | |
| self.radius = (self.r1+self.r2)/2 | |
| self.start_idx = point_indices[0] | |
| self.mid_idx = point_indices[1] | |
| self.center_idx = point_indices[2] | |
| self.end_idx = point_indices[3] | |
| self.bbox = self.verts_to_bbox(np.vstack([self.start, self.end, self.mid])) | |
| self.bottom_left = np.array([self.bbox[0], self.bbox[2]]) | |