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#!/usr/bin/env python
from argaze import DataStructures
import cv2 as cv
import matplotlib.path as mpath
class ROI2D(DataStructures.DictObject):
"""Define Region Of Interest 2D
```
{
'vertices': array of (x, y) tuples,
'pointer': (x, y) tuple or None
}
```
"""
def __init__(self, vertices, pointer = None):
super().__init__(type(self).__name__, **{'vertices': vertices, 'pointer': pointer})
class ROI2DScene(DataStructures.DictObject):
"""Define ROI 2D scene as dictionnary of named ROI2Ds."""
def __init__(self, **rois_2d):
super().__init__(type(self).__name__, **rois_2d)
def __del__(self):
pass
def inside(self, pointer):
"""Store pointer position if it is inside ROIs."""
for name in self.keys():
roi2D = self[name]
if mpath.Path(roi2D.vertices).contains_points([pointer])[0]:
roi2D.pointer = pointer
else:
roi2D.pointer = None
def draw(self, frame):
"""Draw ROI polygons on frame."""
for name in self.keys():
roi2D = self[name]
inside = roi2D.pointer != None
color = (0, 255, 0) if inside else (0, 0, 255)
if inside:
cv.putText(frame, name, (roi2D.vertices[3][0], roi2D.vertices[3][1]), cv.FONT_HERSHEY_SIMPLEX, 1, (255, 255, 255), 1, cv.LINE_AA)
cv.line(frame, roi2D.vertices[-1], roi2D.vertices[0], color, 1)
for A, B in zip(roi2D.vertices, roi2D.vertices[1:]):
cv.line(frame, A, B, color, 1)
class TimeStampedROI2DScenes(DataStructures.TimeStampedBuffer):
"""Define timestamped buffer to store ROI2D scenes"""
def __setitem__(self, key, value: ROI2DScene):
"""Force value to be a ROI2DScene"""
if type(value) != ROI2DScene:
raise ValueError('value must be a ROI2DScene')
super().__setitem__(key, value)
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