使用PyQtGraph绘制精美的股票行情K线图的示例代码

pyqtgraph是Python平台上一种功能强大的2D/3D绘图库，相对于matplotlib库，由于其在内部实现方式上，使用了高速计算的numpy信号处理库以及Qt的GraphicsView框架，因此它在大数据量的处理及快速显示方面有着天然的优势，非常适合于需要快速绘图更新、视频或实时交互性的操作场合，在数学、科学和工程领域都有着广泛的应用。

K线图介绍

对于股票交易者来讲，K线图是弄清股票一段时间走势的一种最基本的图形工具，K线分为阳线和阴线，阳线和阴线都包含了开盘价、收盘价、最高价和最低价，一般K线如下图所示：

当收盘价大于开盘价时，称为阳线，在图形上一般用红色表示，反之，当收盘价低于开盘价时，称为阴线，在图形上一般用绿色表示。由于其形状颇似一根根蜡烛，K线图有时也叫做蜡烛图。

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'QWidget_plot.ui'
#
# Created by: PyQt4 UI code generator 4.11.4
#
# WARNING! All changes made in this file will be lost!

import sys
reload(sys)
sys.setdefaultencoding('utf-8')
from PyQt4 import QtCore, QtGui
import datetime
import pyqtgraph as pg
import tushare as ts

try:
 _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
 def _fromUtf8(s):
   return s

try:
 _encoding = QtGui.QApplication.UnicodeUTF8
 def _translate(context, text, disambig):
   return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
 def _translate(context, text, disambig):
   return QtGui.QApplication.translate(context, text, disambig)

class Ui_MainWindow(object):
 def setupUi(self, MainWindow):
   MainWindow.setObjectName(_fromUtf8("MainWindow"))
   MainWindow.resize(800, 600)
   self.centralwidget = QtGui.QWidget(MainWindow)
   self.centralwidget.setObjectName(_fromUtf8("centralwidget"))
   self.verticalLayout_2 = QtGui.QVBoxLayout(self.centralwidget)
   self.verticalLayout_2.setObjectName(_fromUtf8("verticalLayout"))
   self.verticalLayout_2.setObjectName(_fromUtf8("verticalLayout_2"))
   self.verticalLayout_2.setContentsMargins(0, 0, 0, 0)
   MainWindow.setCentralWidget(self.centralwidget)
   self.menubar = QtGui.QMenuBar(MainWindow)
   self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 31))
   self.menubar.setObjectName(_fromUtf8("menubar"))
   MainWindow.setMenuBar(self.menubar)

self.drawChart = DrawChart(ktype='D')
   self.verticalLayout_2.addWidget(self.drawChart.pyqtgraphDrawChart())

self.retranslateUi(MainWindow)
   QtCore.QMetaObject.connectSlotsByName(MainWindow)

def retranslateUi(self, MainWindow):
   MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow", None))

class DrawChart():
 def __init__(self, code='sz50', start=str(datetime.date.today() - datetime.timedelta(days=200)), end=str(datetime.date.today() + datetime.timedelta(days=1)), ktype='D'):
   self.code = code
   self.start = start
   self.end = end
   self.ktype = ktype
   self.data_list, self.t = self.getData()

def pyqtgraphDrawChart(self):
   try:
     self.item = CandlestickItem(self.data_list)
     self.xdict = {0: str(self.hist_data.index[0]).replace('-', '/'), int((self.t + 1) / 2) - 1: str(self.hist_data.index[int((self.t + 1) / 2)]).replace('-', '/'), self.t - 1: str(self.hist_data.index[-1]).replace('-', '/')}
     self.stringaxis = pg.AxisItem(orientation='bottom')
     self.stringaxis.setTicks([self.xdict.items()])
     self.plt = pg.PlotWidget(axisItems={'bottom': self.stringaxis}, enableMenu=False)

self.plt.addItem(self.item)
     # self.plt.showGrid(x=True, y=True)

return self.plt
   except:
     return pg.PlotWidget()

def getData(self):
   self.start = str(datetime.date.today() - datetime.timedelta(days=150))
   self.end = str(datetime.date.today() + datetime.timedelta(days=1))
   self.hist_data = ts.get_hist_data(self.code, self.start, self.end, self.ktype).sort_index()[-300:-1]
   data_list = []
   t = 0
   for dates, row in self.hist_data.iterrows():
     open, high, close, low, volume, price_change, p_change, ma5, ma10, ma20 = row[:10]
     datas = (t, open, close, low, high, volume, price_change, p_change, ma5, ma10, ma20)
     data_list.append(datas)
     t += 1
   return data_list, t

class CandlestickItem(pg.GraphicsObject):
 def __init__(self, data):
   pg.GraphicsObject.__init__(self)
   self.data = data
   self.generatePicture()

def generatePicture(self):
   self.picture = QtGui.QPicture()
   p = QtGui.QPainter(self.picture)
   p.setPen(pg.mkPen('w'))
   w = (self.data[1][0] - self.data[0][0]) / 3.
   prema5 = 0
   prema10 = 0
   prema20 = 0
   for (t, open, close, min, max, volume, price_change, p_change, ma5, ma10, ma20) in self.data:
     if open > close:
       p.setPen(pg.mkPen('g'))
       p.setBrush(pg.mkBrush('g'))
     else:
       p.setPen(pg.mkPen('r'))
       p.setBrush(pg.mkBrush('r'))
     p.drawLine(QtCore.QPointF(t, min), QtCore.QPointF(t, max))
     p.drawRect(QtCore.QRectF(t - w, open, w * 2, close - open))
     if prema5 != 0:
       p.setPen(pg.mkPen('w'))
       p.setBrush(pg.mkBrush('w'))
       p.drawLine(QtCore.QPointF(t-1, prema5), QtCore.QPointF(t, ma5))
     prema5 = ma5
     if prema10 != 0:
       p.setPen(pg.mkPen('c'))
       p.setBrush(pg.mkBrush('c'))
       p.drawLine(QtCore.QPointF(t-1, prema10), QtCore.QPointF(t, ma10))
     prema10 = ma10
     if prema20 != 0:
       p.setPen(pg.mkPen('m'))
       p.setBrush(pg.mkBrush('m'))
       p.drawLine(QtCore.QPointF(t-1, prema20), QtCore.QPointF(t, ma20))
     prema20 = ma20
   p.end()

def paint(self, p, *args):
   p.drawPicture(0, 0, self.picture)

def boundingRect(self):
   return QtCore.QRectF(self.picture.boundingRect())

if __name__ == "__main__":
 import sys
 app = QtGui.QApplication(sys.argv)
 MainWindow = QtGui.QMainWindow()
 ui = Ui_MainWindow()
 ui.setupUi(MainWindow)
 MainWindow.show()
 sys.exit(app.exec_())

来源：https://blog.csdn.net/otter1010/article/details/83719709