这篇文章主要介绍怎么使用PyQtGraph绘制精美的股票行情K线图，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！
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_())
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