MatPlotLib Python - 来自颜色传感器的RGB值,用于改变线点的颜色

时间:2017-03-20 19:19:38

标签: python matplotlib linestyle drawnow

所以我正在使用TCS3200色彩传感器和Arduino Mega 2560来生成特定的RGB值。然后,通过串行电缆,我将数据发送到VIDLE for Python,拆分3个数据点,并将它们存储在一个数组中(每50个数据点(每个RGB)更新一次MatPlotLib图。)

最初我在三条不同的线上绘制了R,G,B值...现在我正在绘制一条不同的线,基于(255,255,255)坐标系(y-限制为255 * sqrt(3)) 。

我想要做的是:如果我的RGB值是(220,60,140),我希望能够根据这些值更改数据点的颜色。

图表点是sqrt(pow(220,2.0)+ pow(60,2.0)+ pow(140,2.0)),但颜色需要反映RGB值。

我该怎么做?

这是我目前的情节设置:

import serial
import numpy as np
import matplotlib.pyplot as plt
from drawnow import *

distance = []
s = serial.Serial(port='/dev/cu.usbmodem1421', baudrate=115200)
plt.ion()
cnt = 0
limit = 255*sqrt(3);
r = 0
g = 0
b = 0

def makeFig():
        plt.ylim(0,limit)
        plt.title('My Live Streaming Sensor Data')
        plt.grid(True)
        plt.ylabel('RGB Values')
        plt.xlabel('Time')
        # somewhere in the line below I think the RGB dynamics should be reflected
        plt.plot(distance, '-', label='Distance')
        plt.ticklabel_format(useOffset=True)
        plt.legend(loc='upper left')

while True:
        while (s.inWaiting()):
               myDataString = s.readline()
               try:
                       dataArray = myDataString.split(',')
                       print (dataArray)
                       r = float(dataArray[0])
                       g = float(dataArray[1])
                       b = float(dataArray[2])
                       d = float(dataArray[3].strip('\r\n')
                       distance.append(d)
                       # before this 'drawnow' gets called, should the RGB values be incorporated into the plot?
                       drawnow(makeFig)
                       plt.pause(0.000001)
                       cnt = cnt + 1
                       if (cnt > 50):
                               distance.pop(0)
               except ValueError:
                       print (myDataString)

1 个答案:

答案 0 :(得分:1)

这是一种在RGB立方体中与原点的距离对应的位置处绘制一些点的方法。它们的颜色将设置为rgb值元组。

import numpy as np
import matplotlib.pyplot as plt

# Mockup Serial
class Serial():
    n = 0
    def __init__(self, **kwargs):
        self.maxN = kwargs.get("maxN", 1000)
        self.cols = np.arange(0,240,1)
    def inWaiting(self):
        self.n+=1
        return (self.n<self.maxN)
    def readline(self):
        a = np.random.choice(self.cols,size=3)
        a = list(map(str, a))
        b = str(np.random.randint(0,10))
        return ",".join(a)+","+b+'\r\n'

distance = []
colors = []
s = Serial(port='/dev/cu.usbmodem1421', baudrate=115200)
plt.ion()
cnt = 0
limit = 255.*np.sqrt(3)
r = 0
g = 0
b = 0


plt.ylim(0,limit)
plt.title('My Live Streaming Sensor Data')
plt.grid(True)
plt.ylabel('RGB Values')
plt.xlabel('Time')

line,   = plt.plot([],[], '-', color="gray",label='Distance')
scatter  = plt.scatter([],[], s=40, marker='o', label='Hit', zorder=3)
plt.ticklabel_format(useOffset=True)
plt.legend(loc='upper left')


while (s.inWaiting()):
    myDataString = s.readline()
    dataArray = myDataString.split(',')
    r = int(dataArray[0])
    g = int(dataArray[1])
    b = int(dataArray[2])
    d = int(dataArray[3].strip('\r\n'))
    distance.append(np.sqrt(r**2+b**2+g**2))
    color = (r/255.,g/255.,b/255.)
    colors.append(color)
    x = range(len(distance))
    line.set_data(x, distance)
    scatter.set_offsets(np.c_[x,distance])
    scatter.set_color(colors)
    plt.xlim(min(x), max(x))
    plt.pause(0.01)
    cnt = cnt + 1
    if (cnt > 50):
        distance.pop(0)
        colors.pop(0)
    plt.draw()

enter image description here