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import sys
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import time
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import numpy as np
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from matplotlib.backends.qt_compat import QtCore, QtWidgets
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from matplotlib.backends.backend_qt5agg import (FigureCanvas, NavigationToolbar2QT as NavigationToolbar)
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from matplotlib.figure import Figure
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from protocol.Celery.MBTCPMaster import app as MBTCPMApp
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from celery.result import AsyncResult
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from model.ProjectModel.VarManage import ModbusVarManage
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from utils import Globals
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class ActualTrend(QtWidgets.QMainWindow):
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def __init__(self, parent=None, varName = None):
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super(ActualTrend, self).__init__(parent)
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self.varName = varName
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self.protocolManage = Globals.getValue('protocolManage')
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_main = QtWidgets.QWidget()
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self.setCentralWidget(_main)
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layout = QtWidgets.QVBoxLayout(_main)
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dynamic_canvas = FigureCanvas(Figure(figsize=(5, 3)))
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layout.addWidget(dynamic_canvas)
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self.addToolBar(QtCore.Qt.BottomToolBarArea,
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NavigationToolbar(dynamic_canvas, self))
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self.x = [] # 建立空的x轴数组和y轴数组
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self.y = []
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self.maxPoints = 200
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self._dynamic_ax = dynamic_canvas.figure.subplots()
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self._timer = dynamic_canvas.new_timer(
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500, [(self._update_canvas, (), {})])
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self._timer.start()
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def _update_canvas(self):
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# 防止canvas已被销毁时报错
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if not hasattr(self, '_dynamic_ax') or not hasattr(self._dynamic_ax, 'figure') or not hasattr(self._dynamic_ax.figure, 'canvas'):
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return
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varName = self.varName
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if not varName or not self.protocolManage:
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return
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# 获取实时值
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yValue = self.protocolManage.readVariableValue(varName)
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acttime = time.strftime('%H:%M:%S', time.localtime(time.time()))
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if yValue is not None:
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self.x.append(acttime)
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self.y.append(yValue)
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# 只保留最新maxPoints个点
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if len(self.x) > self.maxPoints:
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self.x = self.x[-self.maxPoints:]
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self.y = self.y[-self.maxPoints:]
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self._dynamic_ax.clear()
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pos_list = np.arange(len(self.x))
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self._dynamic_ax.set_xticks(pos_list)
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# 限制最多显示16个主刻度，自动旋转，字体更大更明显
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import matplotlib.ticker as ticker
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max_xticks = 12
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if len(self.x) > max_xticks:
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step = max(1, len(self.x) // max_xticks)
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display_labels = [label if i % step == 0 else '' for i, label in enumerate(self.x)]
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else:
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display_labels = self.x
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self._dynamic_ax.set_xticklabels(display_labels, rotation=30, fontsize=13, fontweight='bold')
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self._dynamic_ax.plot(pos_list, self.y, 'bo-', linewidth=2)
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if self.y:
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minY = min(self.y) - 5
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maxY = max(self.y) + 5
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self._dynamic_ax.set_ylim(minY, maxY)
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from matplotlib.ticker import MaxNLocator
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self._dynamic_ax.yaxis.set_major_locator(MaxNLocator(nbins=12, prune=None))
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self._dynamic_ax.figure.canvas.draw()
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def closeEvent(self, event):
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# 停止定时器，防止回调访问已销毁的canvas
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if hasattr(self, '_timer'):
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self._timer.stop()
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super().closeEvent(event)
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self.hide()
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def showEvent(self, event):
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self._timer.start()
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if __name__ == "__main__":
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qapp = QtWidgets.QApplication(sys.argv)
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app = ActualTrend()
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app.show()
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qapp.exec_()
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