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#! /usr/bin/env python
from random import Random
import colorsys
print "OpenCV Python version of drawing"
import cv2.cv as cv
def random_color(random):
"""
Return a random color
"""
icolor = random.randint(0, 0xFFFFFF)
return cv.Scalar(icolor & 0xff, (icolor >> 8) & 0xff, (icolor >> 16) & 0xff)
if __name__ == '__main__':
# some "constants"
width = 1000
height = 700
window_name = "Drawing Demo"
number = 100
delay = 5
line_type = cv.CV_AA # change it to 8 to see non-antialiased graphics
# create the source image
image = cv.CreateImage( (width, height), 8, 3)
# create window and display the original picture in it
cv.NamedWindow(window_name, 1)
cv.SetZero(image)
cv.ShowImage(window_name, image)
# create the random number
random = Random()
# draw some lines
for i in range(number):
pt1 = (random.randrange(-width, 2 * width),
random.randrange(-height, 2 * height))
pt2 = (random.randrange(-width, 2 * width),
random.randrange(-height, 2 * height))
cv.Line(image, pt1, pt2,
random_color(random),
random.randrange(0, 10),
line_type, 0)
cv.ShowImage(window_name, image)
cv.WaitKey(delay)
# draw some rectangles
for i in range(number):
pt1 = (random.randrange(-width, 2 * width),
random.randrange(-height, 2 * height))
pt2 = (random.randrange(-width, 2 * width),
random.randrange(-height, 2 * height))
cv.Rectangle(image, pt1, pt2,
random_color(random),
random.randrange(-1, 9),
line_type, 0)
cv.ShowImage(window_name, image)
cv.WaitKey(delay)
# draw some ellipes
for i in range(number):
pt1 = (random.randrange(-width, 2 * width),
random.randrange(-height, 2 * height))
sz = (random.randrange(0, 200),
random.randrange(0, 200))
angle = random.randrange(0, 1000) * 0.180
cv.Ellipse(image, pt1, sz, angle, angle - 100, angle + 200,
random_color(random),
random.randrange(-1, 9),
line_type, 0)
cv.ShowImage(window_name, image)
cv.WaitKey(delay)
# init the list of polylines
nb_polylines = 2
polylines_size = 3
pt = [0,] * nb_polylines
for a in range(nb_polylines):
pt [a] = [0,] * polylines_size
# draw some polylines
for i in range(number):
for a in range(nb_polylines):
for b in range(polylines_size):
pt [a][b] = (random.randrange(-width, 2 * width),
random.randrange(-height, 2 * height))
cv.PolyLine(image, pt, 1,
random_color(random),
random.randrange(1, 9),
line_type, 0)
cv.ShowImage(window_name, image)
cv.WaitKey(delay)
# draw some filled polylines
for i in range(number):
for a in range(nb_polylines):
for b in range(polylines_size):
pt [a][b] = (random.randrange(-width, 2 * width),
random.randrange(-height, 2 * height))
cv.FillPoly(image, pt,
random_color(random),
line_type, 0)
cv.ShowImage(window_name, image)
cv.WaitKey(delay)
# draw some circles
for i in range(number):
pt1 = (random.randrange(-width, 2 * width),
random.randrange(-height, 2 * height))
cv.Circle(image, pt1, random.randrange(0, 300),
random_color(random),
random.randrange(-1, 9),
line_type, 0)
cv.ShowImage(window_name, image)
cv.WaitKey(delay)
# draw some text
for i in range(number):
pt1 = (random.randrange(-width, 2 * width),
random.randrange(-height, 2 * height))
font = cv.InitFont(random.randrange(0, 8),
random.randrange(0, 100) * 0.05 + 0.01,
random.randrange(0, 100) * 0.05 + 0.01,
random.randrange(0, 5) * 0.1,
random.randrange(0, 10),
line_type)
cv.PutText(image, "Testing text rendering!",
pt1, font,
random_color(random))
cv.ShowImage(window_name, image)
cv.WaitKey(delay)
# prepare a text, and get it's properties
font = cv.InitFont(cv.CV_FONT_HERSHEY_COMPLEX,
3, 3, 0.0, 5, line_type)
text_size, ymin = cv.GetTextSize("OpenCV forever!", font)
pt1 = ((width - text_size[0]) / 2, (height + text_size[1]) / 2)
image2 = cv.CloneImage(image)
# now, draw some OpenCV pub ;-)
for i in range(0, 512, 2):
cv.SubS(image2, cv.ScalarAll(i), image)
(r, g, b) = colorsys.hsv_to_rgb((i % 100) / 100., 1, 1)
cv.PutText(image, "OpenCV forever!",
pt1, font, cv.RGB(255 * r, 255 * g, 255 * b))
cv.ShowImage(window_name, image)
cv.WaitKey(delay)
# wait some key to end
cv.WaitKey(0)
cv.DestroyAllWindows()
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