python獲取圖像坐標，python 橫坐標旋轉_python旋轉坐標

數據旋轉公式

x1=cos(angle)*x-sin(angle)*y;

y1=cos(angle)*y+sin(angle)*x;

python獲取圖像坐標，從數學上來說，此公式可以用來計算某個點繞另外一點旋轉一定角度后的坐標，例如：A(x，y)繞B(a，b)旋轉β度后的位置為C(c，d)，則x，y，a，b，β，c，d有如下關系式：

import matplotlib.pyplot as plt

import numpy as np

import math

python根據坐標點畫線，a = [0,1,3,3,2,2]

b = [3,4,2,1]

c = [3,3,2,3]

a = np.array(a)

先看橫坐標還是豎坐標、b = np.array(b)

c = np.array(c)

def rotate(angle,valuex,valuey):

rotatex = math.cos(angle)*valuex -math.sin(angle)*valuey

python標注cad坐標點。rotatey = math.cos(angle)*valuey + math.sin(angle)* valuex

rotatex = rotatex.tolist()

rotatey = rotatey.tolist()

xy = rotatex + rotatey

橫坐標是哪個？return xy

def getLen(x1,y1,x2,y2):

diff_x = (x1-x2)**2

diff_y = (y1-y2)**2

怎么看橫坐標和縱坐標。length = np.sqrt(diff_x+diff_y)

return length

lie = np.linspace(0,2,20) #畫圖時橫縱坐標刻度，影響著它們的形狀，可以設置一下刻度分布

for i in lie:

一個橫坐標三個縱坐標？t = math.pi*i

a1 = rotate(t,a[0:3],a[3:6])

b1 = rotate(t,b[0:2],b[2:4])

c1 = rotate(t,c[0:2],c[2:4])

python有什么用？len1 = getLen(a[0],a[3],a[1],a[4])

len2 = getLen(a1[0],a1[3],a1[1],a1[4])

print(len1)

print(len2)

坐標？print("旋轉后長度是否相等",len1==len2)

plt.plot(a[0:3],a[3:6],color='green')

plt.plot(b[0:2],b[2:4],color='green')

plt.plot(c[0:2],c[2:4],color='green')

plt.plot(a1[0:3],a1[3:6],color='red')

plt.plot(b1[0:2],b1[2:4],color='red')

plt.plot(c1[0:2],c1[2:4],color='red')

plt.xticks(np.arange(-5,5,0.5))

plt.yticks(np.arange(-5,5,0.5))

plt.show()