| 20 | |
| 21 | |
| 22 | class CpuLineChart(QChart): |
| 23 | |
| 24 | def __init__(self, *args, **kwargs): |
| 25 | super(CpuLineChart, self).__init__(*args, **kwargs) |
| 26 | self.m_count = 10 |
| 27 | # 隐藏图例 |
| 28 | self.legend().hide() |
| 29 | self.m_series = QSplineSeries(self) |
| 30 | # 设置画笔 |
| 31 | self.m_series.setPen(QPen(QColor('#3B8CFF'), 2, Qt.SolidLine, Qt.RoundCap, Qt.RoundJoin)) |
| 32 | self.addSeries(self.m_series) |
| 33 | # x轴 |
| 34 | self.m_axisX = QDateTimeAxis(self) |
| 35 | self.m_axisX.setTickCount(self.m_count + 1) # 设置刻度数量 |
| 36 | self.m_axisX.setFormat('hh:mm:ss') # 设置时间显示格式 |
| 37 | now = QDateTime.currentDateTime() # 前10秒到现在 |
| 38 | self.m_axisX.setRange(now.addSecs(-self.m_count), now) |
| 39 | self.addAxis(self.m_axisX, Qt.AlignBottom) |
| 40 | self.m_series.attachAxis(self.m_axisX) |
| 41 | # y轴 |
| 42 | self.m_axisY = QValueAxis(self) |
| 43 | self.m_axisY.setLabelFormat('%d') # 设置文本格式 |
| 44 | self.m_axisY.setMinorTickCount(4) # 设置小刻度线的数目 |
| 45 | self.m_axisY.setTickCount(self.m_count + 1) |
| 46 | self.m_axisY.setRange(0, 100) |
| 47 | self.addAxis(self.m_axisY, Qt.AlignLeft) |
| 48 | self.m_series.attachAxis(self.m_axisY) |
| 49 | |
| 50 | # 填充11个初始点，注意x轴 需要转为秒的时间戳 |
| 51 | self.m_series.append( |
| 52 | [QPointF(now.addSecs(-i).toMSecsSinceEpoch(), 0) for i in range(self.m_count, -1, -1)]) |
| 53 | |
| 54 | # 定时器获取数据 |
| 55 | self.m_timer = QTimer() |
| 56 | self.m_timer.timeout.connect(self.update_data) |
| 57 | self.m_timer.start(1000) |
| 58 | |
| 59 | def update_data(self): |
| 60 | value = cpu_percent() |
| 61 | now = QDateTime.currentDateTime() |
| 62 | self.m_axisX.setRange(now.addSecs(-self.m_count), now) # 重新调整x轴的时间范围 |
| 63 | # 获取原来的所有点,去掉第一个并追加新的一个 |
| 64 | points = self.m_series.pointsVector() |
| 65 | points.pop(0) |
| 66 | points.append(QPointF(now.toMSecsSinceEpoch(), value)) |
| 67 | # 替换法速度更快 |
| 68 | self.m_series.replace(points) |
| 69 | |
| 70 | |
| 71 | if __name__ == '__main__': |