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#!/usr/bin/env python
'''
This program demonstrates OpenCV drawing and text output functions by drawing different shapes and text strings
Usage :
python3 drawing.py
Press any button to exit
'''
# Python 2/3 compatibility
from __future__ import print_function
import numpy as np
import cv2 as cv
# Drawing Lines
def lines():
for i in range(NUMBER*2):
pt1, pt2 = [], []
pt1.append(np.random.randint(x1, x2))
pt1.append(np.random.randint(y1, y2))
pt2.append(np.random.randint(x1, x2))
pt2.append(np.random.randint(y1, y2))
color = "%06x" % np.random.randint(0, 0xFFFFFF)
color = tuple(int(color[i:i+2], 16) for i in (0, 2 ,4))
arrowed = np.random.randint(0, 6)
if (arrowed<3):
cv.line(image, tuple(pt1), tuple(pt2), color, np.random.randint(1, 10), lineType)
else:
cv.arrowedLine(image, tuple(pt1), tuple(pt2), color, np.random.randint(1, 10), lineType)
cv.imshow(wndname, image)
if cv.waitKey(DELAY)>=0:
return
# Drawing Rectangle
def rectangle():
for i in range(NUMBER*2):
pt1, pt2 = [], []
pt1.append(np.random.randint(x1, x2))
pt1.append(np.random.randint(y1, y2))
pt2.append(np.random.randint(x1, x2))
pt2.append(np.random.randint(y1, y2))
color = "%06x" % np.random.randint(0, 0xFFFFFF)
color = tuple(int(color[i:i+2], 16) for i in (0, 2 ,4))
thickness = np.random.randint(-3, 10)
marker = np.random.randint(0, 10)
marker_size = np.random.randint(30, 80)
if (marker > 5):
cv.rectangle(image, tuple(pt1), tuple(pt2), color, max(thickness, -1), lineType)
else:
cv.drawMarker(image, tuple(pt1), color, marker, marker_size)
cv.imshow(wndname, image)
if cv.waitKey(DELAY)>=0:
return
# Drawing ellipse
def ellipse():
for i in range(NUMBER*2):
center = []
center.append(np.random.randint(x1, x2))
center.append(np.random.randint(x1, x2))
axes = []
axes.append(np.random.randint(0, 200))
axes.append(np.random.randint(0, 200))
angle = np.random.randint(0, 180)
color = "%06x" % np.random.randint(0, 0xFFFFFF)
color = tuple(int(color[i:i+2], 16) for i in (0, 2 ,4))
thickness = np.random.randint(-1, 9)
cv.ellipse(image, tuple(center), tuple(axes), angle, angle-100, angle + 200, color, thickness, lineType)
cv.imshow(wndname, image)
if cv.waitKey(DELAY)>=0:
return
# Drawing Polygonal Curves
def polygonal():
for i in range(NUMBER):
pt = [(0, 0)]*6
pt = np.resize(pt, (2, 3, 2))
pt[0][0][0] = np.random.randint(x1, x2)
pt[0][0][1] = np.random.randint(y1, y2)
pt[0][1][0] = np.random.randint(x1, x2)
pt[0][1][1] = np.random.randint(y1, y2)
pt[0][2][0] = np.random.randint(x1, x2)
pt[0][2][1] = np.random.randint(y1, y2)
pt[1][0][0] = np.random.randint(x1, x2)
pt[1][0][1] = np.random.randint(y1, y2)
pt[1][1][0] = np.random.randint(x1, x2)
pt[1][1][1] = np.random.randint(y1, y2)
pt[1][2][0] = np.random.randint(x1, x2)
pt[1][2][1] = np.random.randint(y1, y2)
color = "%06x" % np.random.randint(0, 0xFFFFFF)
color = tuple(int(color[i:i+2], 16) for i in (0, 2 ,4))
alist = []
for k in pt[0]:
alist.append(k)
for k in pt[1]:
alist.append(k)
ppt = np.array(alist)
cv.polylines(image, [ppt], True, color, thickness = np.random.randint(1, 10), lineType = lineType)
cv.imshow(wndname, image)
if cv.waitKey(DELAY) >= 0:
return
# fills an area bounded by several polygonal contours
def fill():
for i in range(NUMBER):
pt = [(0, 0)]*6
pt = np.resize(pt, (2, 3, 2))
pt[0][0][0] = np.random.randint(x1, x2)
pt[0][0][1] = np.random.randint(y1, y2)
pt[0][1][0] = np.random.randint(x1, x2)
pt[0][1][1] = np.random.randint(y1, y2)
pt[0][2][0] = np.random.randint(x1, x2)
pt[0][2][1] = np.random.randint(y1, y2)
pt[1][0][0] = np.random.randint(x1, x2)
pt[1][0][1] = np.random.randint(y1, y2)
pt[1][1][0] = np.random.randint(x1, x2)
pt[1][1][1] = np.random.randint(y1, y2)
pt[1][2][0] = np.random.randint(x1, x2)
pt[1][2][1] = np.random.randint(y1, y2)
color = "%06x" % np.random.randint(0, 0xFFFFFF)
color = tuple(int(color[i:i+2], 16) for i in (0, 2 ,4))
alist = []
for k in pt[0]:
alist.append(k)
for k in pt[1]:
alist.append(k)
ppt = np.array(alist)
cv.fillPoly(image, [ppt], color, lineType)
cv.imshow(wndname, image)
if cv.waitKey(DELAY) >= 0:
return
# Drawing Circles
def circles():
for i in range(NUMBER):
center = []
center.append(np.random.randint(x1, x2))
center.append(np.random.randint(x1, x2))
color = "%06x" % np.random.randint(0, 0xFFFFFF)
color = tuple(int(color[i:i+2], 16) for i in (0, 2 ,4))
cv.circle(image, tuple(center), np.random.randint(0, 300), color, np.random.randint(-1, 9), lineType)
cv.imshow(wndname, image)
if cv.waitKey(DELAY) >= 0:
return
# Draws a text string
def string():
for i in range(NUMBER):
org = []
org.append(np.random.randint(x1, x2))
org.append(np.random.randint(x1, x2))
color = "%06x" % np.random.randint(0, 0xFFFFFF)
color = tuple(int(color[i:i+2], 16) for i in (0, 2 ,4))
cv.putText(image, "Testing text rendering", tuple(org), np.random.randint(0, 8), np.random.randint(0, 100)*0.05+0.1, color, np.random.randint(1, 10), lineType)
cv.imshow(wndname, image)
if cv.waitKey(DELAY) >= 0:
return
def string1():
textsize = cv.getTextSize("OpenCV forever!", cv.FONT_HERSHEY_COMPLEX, 3, 5)
org = (int((width - textsize[0][0])/2), int((height - textsize[0][1])/2))
for i in range(0, 255, 2):
image2 = np.array(image) - i
cv.putText(image2, "OpenCV forever!", org, cv.FONT_HERSHEY_COMPLEX, 3, (i, i, 255), 5, lineType)
cv.imshow(wndname, image2)
if cv.waitKey(DELAY) >= 0:
return
if __name__ == '__main__':
print(__doc__)
wndname = "Drawing Demo"
NUMBER = 100
DELAY = 5
width, height = 1000, 700
lineType = cv.LINE_AA # change it to LINE_8 to see non-antialiased graphics
x1, x2, y1, y2 = -width/2, width*3/2, -height/2, height*3/2
image = np.zeros((height, width, 3), dtype = np.uint8)
cv.imshow(wndname, image)
cv.waitKey(DELAY)
lines()
rectangle()
ellipse()
polygonal()
fill()
circles()
string()
string1()
cv.waitKey(0)
cv.destroyAllWindows()
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