| show | version | enable_checker |
|---|---|---|
step |
1.0 |
true |
- 上次使用了随机效果
- 随机点
- 随机颜色
- 随机圆心
- 随机端点
- 随机位移
- 还可以做点什么好玩的吗？🤔
- 比如三角函数？
import numpy as np
import cv2
import math
canvas = np.zeros((300, 300,3), np.uint8)
x = 0
for num in range(0,300):
radius = 1
x = x + 1
y = int(150 + math.sin(x/10) * 100)
print(x,y)
canvas = cv2.circle(canvas,(x, y),radius,(255,255,0),1)
cv2.imshow("Line",canvas)
cv2.waitKey()
cv2.destroyAllWindows()
- 生成
- 能否更加连续鲜明呢？
import numpy as np
import cv2
import math
canvas = np.zeros((300, 300,3), np.uint8)
for x in range(0,300):
x1 = x
x2 = x + 1
y1 = int(150 + math.sin(x1/10) * 100)
y2 = int(150 + math.sin(x2/10) * 100)
canvas = cv2.line(canvas,(x1, y1),(x2, y2), (255,255,0),2)
cv2.imshow("Line",canvas)
cv2.waitKey()
cv2.destroyAllWindows()
- 这次画的是线段
- 可以绘制余弦曲线吗？
import numpy as np
import cv2
import math
canvas = np.zeros((300, 300,3), np.uint8)
for x in range(0,300):
x1 = x
x2 = x + 1
y1 = int(150 + math.cos(x1/20) * 100)
y2 = int(150 + math.cos(x2/20) * 100)
canvas = cv2.line(canvas,(x1, y1),(x2, y2), (255,255,0),2)
cv2.imshow("Line",canvas)
cv2.waitKey()
cv2.destroyAllWindows()
- 余弦
import numpy as np
import cv2
import math
canvas = np.zeros((300, 300,3), np.uint8)
for num in range(0,360,15):
radius = math.radians(num)
x = int(150 + math.cos(radius) * 100)
y = int(150 + math.sin(radius) * 100)
print(x,y)
canvas = cv2.circle(canvas,(x, y),20,(255,255,0),1)
cv2.imshow("Line",canvas)
cv2.waitKey()
cv2.destroyAllWindows()
- 圆形组成的圆
- 可以加些随机进去吗？
import numpy as np
import random
import cv2
import math
canvas = np.zeros((300, 300,3), np.uint8)
for num in range(0,360,15):
radius = math.radians(num)
x = int(150 + math.cos(radius) * 100)
y = int(150 + math.sin(radius) * 100)
r = random.randint(20,30)
color = np.random.randint(0,256,size=(3,)).tolist()
print("num:",num,"~color",color,"~(x,y)",(x,y),"~r",r)
canvas = cv2.circle(canvas,(x, y),r,color,1)
cv2.imshow("Line",canvas)
cv2.waitKey()
cv2.destroyAllWindows()
- 加些随机因素
- 想要读取图片
- 然后在图片上绘画
- 并保存
import cv2
import numpy as np
import math
canvas = cv2.imread("/home/shiyanlou/kun1.png")
cv2.putText(canvas,"kun",(30,80),cv2.FONT_HERSHEY_DUPLEX,1,(0,0,255),1)
for num in range(0,360,15):
radius = math.radians(num)
x = int(305 + math.cos(radius) * 100)
y = int(178 + math.sin(radius) * 100)
print(x,y)
canvas = cv2.circle(canvas,(x, y),20,(0,0,255),1)
cv2.imshow("kun",canvas)
cv2.waitKey()
cv2.destroyAllWindows()
cv2.imwrite('/home/shiyanlou/kunkun.png',canvas)
- 效果
import numpy as np
import cv2
import time
import math
width = height = 300
center_x = center_y = 150
x = y = 0
r = 0
img = np.zeros((width, height, 3),np.uint8)
for num in range(360):
if num == 0:
x = 250
y = 150
continue
radius = num / 360 * 2 * math.pi
new_x = int(center_x + math.cos(radius) * 100)
new_y = int(center_y + math.sin(radius) * 100)
print("x,y",x,y,"====new_x,new_y",new_x, new_y)
img = cv2.line(img, (x,y),(new_x, new_y), (255,255,255),3)
x = new_x
y = new_y
cv2.imshow("img",img)
cv2.waitKey()
cv2.destroyAllWindows()
- 画圆
- 可以加点随机吗？
import numpy as np
import cv2
import time
import math
import random
width = height = 300
center_x = center_y = 150
x = y = 0
r = 0
img = np.zeros((width, height, 3),np.uint8)
for num in range(360):
if num == 0:
x = 250
y = 150
continue
r = r - 1 + random.randint(0,2)
if r > 103:
r = 103
if r < 97:
r = 97
radius = num / 360 * 2 * math.pi
new_x = int(center_x + math.cos(radius) * r)
new_y = int(center_y + math.sin(radius) * r)
print("x,y",x,y,"====new_x,new_y",new_x, new_y)
img = cv2.line(img, (x,y),(new_x, new_y), (255,255,255),3)
x = new_x
y = new_y
cv2.imshow("img",img)
cv2.waitKey()
cv2.destroyAllWindows()
- 使用三角函数画圆
- 并加入随机因素
- 这次研究了三角函数
- 画正余弦曲线
- 画圆
- 还可以画点什么吗？🤔
- 下次再说👋