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#!/usr/bin/env python
import cv2 as cv
import matplotlib.path as mpath
class ROI2DScene(list):
"""List of ROI3D dictionary.
```
{
'NAME': str,
'VERTICES': array of (x, y) tuples,
'POINTER_INSIDE': bool
}
```
"""
def __new__(cls):
return super(ROI2DScene, cls).__new__(cls)
def __init__(self):
pass
def __del__(self):
pass
def inside(self, pointer):
"""Check if a (x, y) pointer is inside ROIs."""
for roi in self:
roi['POINTER_INSIDE'] = mpath.Path(roi['VERTICES']).contains_points([pointer])[0]
def draw(self, frame):
"""Draw ROI polygons on frame."""
for roi in self:
vertices = roi['VERTICES']
inside = roi['POINTER_INSIDE']
color = (0, 255, 0) if inside else (0, 0, 255)
if inside:
cv.putText(frame, roi['NAME'], (vertices[3][0], vertices[3][1]), cv.FONT_HERSHEY_SIMPLEX, 1, (255, 255, 255), 1, cv.LINE_AA)
cv.line(frame, vertices[-1], vertices[0], color, 1)
for A, B in zip(vertices, vertices[1:]):
cv.line(frame, A, B, color, 1)
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