更新 PYQT5 中的图表数据
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【中文标题】更新 PYQT5 中的图表数据【英文标题】：Update chart data in PYQT5 【发布时间】：2020-01-15 12:47:58 【问题描述】：我的上一个问题Insert QChartView to ui
def draw_chart(self, obj, chart_view, replace=0):
obj.setContentsMargins(0, 0, 0, 0)
lay = QtWidgets.QHBoxLayout(obj)
lay.setContentsMargins(0, 0, 0, 0)
if replace:
# lay.replaceWidget(chart_view)
pass
else:
lay.addWidget(chart_view)
我这样调用这个函数：
cv1 = self.candle_chart(self.p)
self.draw_chart(self.chart1, cv1, 0)
candle_chart 返回一个QtChart.QChartView 对象，self.chart1 是Qwidget 的对象名称。
第一次可以正常使用，但是当我想更新图表时它会出错：
QLayout: Attempting to add QLayout "" to QWidget "chart1", which already has a layout
我正在尝试通过单击按钮来更改图表数据
完整代码：
class Test(base_3, form_3):
def __init__(self):
super(base_3, self).__init__()
self.setupUi(self)
self.p = [(1, 7380, 7520, 7380, 7510, 7324),
(2, 7520, 7580, 7410, 7440, 7372),
(3, 7440, 7650, 7310, 7520, 7434),
(4, 7450, 7640, 7450, 7550, 7480),
(5, 7510, 7590, 7460, 7490, 7502),
(6, 7500, 7590, 7480, 7560, 7512),
(7, 7560, 7830, 7540, 7800, 7584)]
self.next.clicked.connect(self.more)
self.lmt = 3
self.st = 0
cv1 = self.candle_chart(self.p[self.st:self.lmt])
self.draw_chart(self.chart1, cv1, 0)
def more(self):
cv1 = self.candle_chart(self.p[self.st:self.lmt])
self.draw_chart(self.chart1, cv1, 1)
self.st += 1
self.lmt += 1
def draw_chart(self, label, chart_view, replace=0):
label.setContentsMargins(0, 0, 0, 0)
lay = QtWidgets.QHBoxLayout(label)
lay.setContentsMargins(0, 0, 0, 0)
if replace:
# lay.replaceWidget(chart_view)
pass
else:
lay.addWidget(chart_view)
def candle_chart(self, data):
series = QtChart.QCandlestickSeries()
series.setDecreasingColor(QtCore.Qt.red)
series.setIncreasingColor(QtCore.Qt.green)
tm = []
i = 0
for d, o, h, l, c, v in data:
# x = x[1]
# series.append(QtChart.QCandlestickSet(x["open"], x["high"], x["low"], x["close"]))
series.append(QtChart.QCandlestickSet(o, h, l, c))
tm.append(str(i))
i += 1
chart = QtChart.QChart()
chart.addSeries(series)
chart.createDefaultAxes()
chart.legend().hide()
chart.axisX(series).setCategories(tm)
chart_view = QtChart.QChartView(chart)
return chart_view
用户界面代码：
<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>MainWindow</class>
<widget class="QMainWindow" name="MainWindow">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>1381</width>
<height>680</height>
</rect>
</property>
<property name="windowTitle">
<string>MainWindow</string>
</property>
<widget class="QWidget" name="centralwidget">
<widget class="QPushButton" name="next">
<property name="geometry">
<rect>
<x>490</x>
<y>540</y>
<width>88</width>
<height>33</height>
</rect>
</property>
<property name="text">
<string>Next</string>
</property>
</widget>
<widget class="QWidget" name="chart1" native="true">
<property name="enabled">
<bool>true</bool>
</property>
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>460</width>
<height>250</height>
</rect>
</property>
</widget>
<widget class="QWidget" name="chart2" native="true">
<property name="geometry">
<rect>
<x>460</x>
<y>0</y>
<width>460</width>
<height>250</height>
</rect>
</property>
</widget>
<widget class="QWidget" name="chart3" native="true">
<property name="geometry">
<rect>
<x>920</x>
<y>0</y>
<width>460</width>
<height>250</height>
</rect>
</property>
</widget>
<widget class="QWidget" name="chart5" native="true">
<property name="geometry">
<rect>
<x>450</x>
<y>250</y>
<width>450</width>
<height>250</height>
</rect>
</property>
</widget>
<widget class="QWidget" name="chart6" native="true">
<property name="geometry">
<rect>
<x>900</x>
<y>250</y>
<width>450</width>
<height>250</height>
</rect>
</property>
</widget>
<widget class="QWidget" name="chart4" native="true">
<property name="enabled">
<bool>true</bool>
</property>
<property name="geometry">
<rect>
<x>0</x>
<y>250</y>
<width>450</width>
<height>250</height>
</rect>
</property>
</widget>
</widget>
<widget class="QMenuBar" name="menubar">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>1381</width>
<height>25</height>
</rect>
</property>
</widget>
<widget class="QStatusBar" name="statusbar"/>
</widget>
<resources/>
<connections/>
</ui>
【问题讨论】：
我已经在上面添加了完整的代码 您的代码不是我认为您应该知道的 MRE，因此如果您需要更多帮助，请提供您被要求的内容或在您的情况下实施我的解决方案。 我已经把代码最小化了。 你可以提供“数据”的例子 已更新...... 【参考方案1】：您不必更换小部件，最好重复使用，如下所示：
import sys
from PyQt5 import QtCore, QtWidgets, uic, QtChart
# load both ui file
uifile_1 = "UI/main.ui"
form_1, base_1 = uic.loadUiType(uifile_1)
class Example(base_1, form_1):
def __init__(self):
super(base_1, self).__init__()
self.setupUi(self)
self.series = QtChart.QCandlestickSeries()
self.series.setDecreasingColor(QtCore.Qt.red)
self.series.setIncreasingColor(QtCore.Qt.green)
self.ma5 = QtChart.QLineSeries() # 5-days average data line
self.chart = QtChart.QChart()
self.chart.addSeries(self.series) # candle
self.chart.addSeries(self.ma5) # ma5 line
self.chart.createDefaultAxes()
self.chart.legend().hide()
self.chart.axisX(self.ma5).setVisible(False)
self.chart.setAnimationOptions(QtChart.QChart.SeriesAnimations)
self.chartview = QtChart.QChartView(self.chart)
self.chart_container.setContentsMargins(0, 0, 0, 0)
lay = QtWidgets.QHBoxLayout(self.chart_container)
lay.setContentsMargins(0, 0, 0, 0)
lay.addWidget(self.chartview)
self.update_data()
timer = QtCore.QTimer(self, interval=1000, timeout=self.update_data)
timer.start()
def update_data(self):
import random
data = ((i, *random.sample(range(7000, 8000), 5)) for i in range(7))
self.series.clear()
self.ma5.clear()
tm = [] # stores str type data
x_min, x_max, y_min, y_max = (
float("inf"),
-float("inf"),
float("inf"),
-float("inf"),
)
# in a loop, series and ma5 append corresponding data
for num, o, h, l, c, m in data:
self.series.append(QtChart.QCandlestickSet(o, h, l, c))
self.ma5.append(QtCore.QPointF(num, m))
tm.append(str(num))
x_min = min(x_min, num)
x_max = max(x_max, num)
y_min = min(y_min, m, o, h, l, c)
y_max = max(y_max, m, o, h, l, c)
self.chart.axisY(self.series).setMin(y_min)
self.chart.axisY(self.series).setMax(y_max)
self.chart.axisX(self.series).setCategories(tm)
self.chart.axisX(self.ma5).setMin(x_min)
self.chart.axisX(self.ma5).setMax(x_max)
if __name__ == "__main__":
app = QtWidgets.QApplication(sys.argv)
ex = Example()
ex.show()
sys.exit(app.exec_())
【讨论】：
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