OpenCV-Applications/BasicDrawing2.py at master · eeyribas/OpenCV-Applications · GitHub

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import cv2
import numpy as np
import matplotlib.pyplot as plt

def ShowWithMatplotlib(img, title):
    imgRGB=img[:, :, ::-1]
    plt.imshow(imgRGB)
    plt.title(title)
    plt.show()

colors={'blue':(255, 0, 0), 'green':(0, 255, 0), 'red':(0, 0, 255), 'yellow':(0, 255, 255),
        'magenta':(255, 0, 255), 'cyan':(255, 255, 0), 'white':(255, 255, 255), 'black':(0, 0, 0),
        'gray':(125, 125, 125), 'rand':np.random.randint(0, high=256, size=(3,)).tolist(),
        'dark_gray':(50, 50, 50), 'light_gray':(220, 220, 220)}
image=np.zeros((300, 300, 3), dtype="uint8")
image[:]=colors['light_gray']

cv2.line(image, (0, 0), (300, 300), colors['green'], 3)
cv2.rectangle(image, (0, 0), (100, 100), colors['blue'], 3)
ret, p1, p2=cv2.clipLine((0, 0, 100, 100), (0, 0), (300, 300))
if ret:
    cv2.line(image, p1, p2, colors['yellow'], 3)
ShowWithMatplotlib(image, 'cv2.clipLine()')

image[:]=colors['light_gray']
cv2.arrowedLine(image, (50, 50), (200, 50), colors['red'], 3, 8, 0, 0.1)
cv2.arrowedLine(image, (50, 120), (200, 120), colors['green'], 3, cv2.LINE_AA, 0, 0.3)
cv2.arrowedLine(image, (50, 200), (200, 200), colors['blue'], 3, 8, 0, 0.3)
ShowWithMatplotlib(image, 'cv2.arrowedLine()')

image[:]=colors['light_gray']
cv2.ellipse(image, (80, 80), (60, 40), 0, 0, 360, colors['red'], -1)
cv2.ellipse(image, (80, 200), (80, 40), 0, 0, 360, colors['green'], 3)
cv2.ellipse(image, (80, 200), (10, 40), 0, 0, 360, colors['blue'], 3)
cv2.ellipse(image, (200, 200), (10, 40), 0, 0, 180, colors['yellow'], 3)
cv2.ellipse(image, (200, 100), (10, 40), 0, 0, 270, colors['cyan'], 3)
cv2.ellipse(image, (250, 250), (30, 30), 0, 0, 360, colors['magenta'], 3)
cv2.ellipse(image, (250, 100), (20, 40), 45, 0, 360, colors['gray'], 3)

ShowWithMatplotlib(image, 'cv2.ellipse()')
image[:]=colors['light_gray']
pts=np.array([[250, 5], [220, 80], [280, 80]], np.int32)
pts=pts.reshape((-1, 1, 2))
print("shape of pts '{}'".format(pts.shape))

cv2.polylines(image, [pts], True, colors['green'], 3)
pts=np.array([[250, 105], [220, 180], [280, 180]], np.int32)
pts=pts.reshape((-1, 1, 2))
print("shape of pts '{}'".format(pts.shape))

cv2.polylines(image, [pts], False, colors['green'], 3)
pts=np.array([[20, 90], [60, 60], [100, 90], [80, 130], [40, 130]], np.int32)
pts=pts.reshape((-1, 1, 2))
print("shape of pts '{}'".format(pts.shape))

cv2.polylines(image, [pts], True, colors['blue'], 3)
pts=np.array([[20, 180], [60, 150], [100, 180], [80, 220], [40, 220]], np.int32)
pts=pts.reshape((-1, 1, 2))
print("shape of pts '{}'".format(pts.shape))

cv2.polylines(image, [pts], False, colors['blue'], 3)
pts=np.array([[150, 100], [200, 100], [200, 150], [150, 150]], np.int32)
pts=pts.reshape((-1, 1, 2))
print("shape of pts '{}'".format(pts.shape))

cv2.polylines(image, [pts], True, colors['yellow'], 3)
pts=np.array([[150, 200], [200, 200], [200, 250], [150, 250]], np.int32)
pts=pts.reshape((-1, 1, 2))
print("shape of pts '{}'".format(pts.shape))

cv2.polylines(image, [pts], False, colors['yellow'], 3)
ShowWithMatplotlib(image, 'cv2.polylines()')