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。
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# -*- 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 sysreload(sys)sys.setdefaultencoding('utf-8')from pyqt4 import qtcore, qtguiimport datetimeimport pyqtgraph as pgimport tushare as tstry: _fromutf8 = qtcore.qstring.fromutf8except attributeerror: def _fromutf8(s): return stry: _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, tclass 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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原文链接：https://blog.csdn.net/otter1010/article/details/83719709
