标签:return rom 改变 打开 highlight ping 解释器 data size
1. 最近在测试一款设备,采集了一些设备后需要一帧一帧显示图像,经常使用Python,所以选用了Matplotlib进行图像操作
数据结构: timesatamp polar_distance horizontal_angle refelectivity_intensity,所有数据类型都是 float,储存在文件内并且以空格分隔
import math
import matplotlib.pyplot as plt
#read data from file
def LoadData(filename):
inFile = open(filename, ‘r‘)
#declare two empty list,to save data
inten = []
polar_dist = []
hori_angle = []
for line in inFile:
splitline = line.split(" ")
polar_dist.append(splitline[1])
hori_angle.append(splitline[2])
inten.append(splitline[3])
inFile.close()
#mapping to float
polar_dist = list(map(float,polar_dist))
hori_angle = list(map(float,hori_angle))
inten = list(map(float,inten))
return(polar_dist, hori_angle,inten)
2. 显示极坐标图像
def GenerateImageFromData(polar,angle,inten):
d2r = math.pi/180
for i in range(len(polar)):
angle[i] = d2r*(angle[i] +180)
plt.ion()
#inreactive code
ax = plt.subplot(111, projection=‘polar‘)
for i in range(100):
c = ax.scatter(angle[i*167 :(i+1)*167], polar[i*167 :(i+1)*167], s = 10)
plt.show()
plt.pause(1)
3. 调用函数
if __name__=="__main__": (polar,angle,inten) = LoadData("CloudData.txt") GenerateImageFromData(polar,angle,inten)
当绘图语句中加入pl.ion()时,表示打开了交互模式。此时python解释器解释完所有命令后,给你出张图,但不会结束会话,而是等着你跟他交流交流。如果你继续往代码中加入语句,run之后,你会实时看到图形的改变。当绘图语句中加入pl.ioff()时或不添加pl.ion()时,表示打关了交互模式。
4. 另外一个example
#!/usr/bin/env python3 # -*- coding: utf-8 -*- """ Created on Thu Nov 16 21:26:17 2017 @author: XX """ import matplotlib.pylab as plt import numpy as np import math #clear images plt.close() fig = plt.figure() ax = fig.add_subplot(111) #ratio of x and y axis ax.axis("equal") #enable grid of image ax.grid(True) #activate inreactivate mode plt.ion() init_x = 0.0 init_y = 3.5 init_angle = 45 init_wind_speed = 3 print("inreactive mode beginning") try: for t in range(50): x = init_x + init_wind_speed*math.sin(math.pi/180*init_angle)*t y = init_y + init_wind_speed*math.cos(init_angle*math.pi/180)*t ax.scatter(x,y,c=‘r‘, s =5, marker =‘^‘) plt.pause(0.2) except Exception as err: print(err)
Python Matplotlib.plot Update image Questions
标签:return rom 改变 打开 highlight ping 解释器 data size
原文地址:http://www.cnblogs.com/flyinggod/p/7846760.html