| 128 | |
| 129 | |
| 130 | class ChartView(QChartView): |
| 131 | |
| 132 | def __init__(self, *args, **kwargs): |
| 133 | super(ChartView, self).__init__(*args, **kwargs) |
| 134 | self.resize(800, 600) |
| 135 | self.setRenderHint(QPainter.Antialiasing) # 抗锯齿 |
| 136 | self.initChart() |
| 137 | |
| 138 | self.toolTipWidget = GraphicsProxyWidget(self._chart) |
| 139 | |
| 140 | # line |
| 141 | self.lineItem = QGraphicsLineItem(self._chart) |
| 142 | self.lineItem.setZValue(998) |
| 143 | self.lineItem.hide() |
| 144 | |
| 145 | # 一些固定计算，减少mouseMoveEvent中的计算量 |
| 146 | # 获取x和y轴的最小最大值 |
| 147 | axisX, axisY = self._chart.axisX(), self._chart.axisY() |
| 148 | self.min_x, self.max_x = axisX.min(), axisX.max() |
| 149 | self.min_y, self.max_y = axisY.min(), axisY.max() |
| 150 | # 坐标系中左上角顶点 |
| 151 | self.point_top = self._chart.mapToPosition( |
| 152 | QPointF(self.min_x, self.max_y)) |
| 153 | # 坐标原点坐标 |
| 154 | self.point_bottom = self._chart.mapToPosition( |
| 155 | QPointF(self.min_x, self.min_y)) |
| 156 | self.step_x = (self.max_x - self.min_x) / (axisX.tickCount() - 1) |
| 157 | |
| 158 | # self.step_y = (self.max_y - self.min_y) / (axisY.tickCount() - 1) |
| 159 | |
| 160 | def mouseMoveEvent(self, event): |
| 161 | super(ChartView, self).mouseMoveEvent(event) |
| 162 | # 把鼠标位置所在点转换为对应的xy值 |
| 163 | x = self._chart.mapToValue(event.pos()).x() |
| 164 | y = self._chart.mapToValue(event.pos()).y() |
| 165 | index = round((x - self.min_x) / self.step_x) |
| 166 | # print(x, pos_x, index, index * self.step_x + self.min_x) |
| 167 | # 得到在坐标系中的所有series的类型和点 |
| 168 | points = [(serie, serie.at(index)) |
| 169 | for serie in self._chart.series() if |
| 170 | self.min_x <= x <= self.max_x and self.min_y <= y <= self.max_y] |
| 171 | if points: |
| 172 | # 跟随鼠标的黑线条 |
| 173 | self.lineItem.setLine(event.pos().x(), self.point_top.y(), |
| 174 | event.pos().x(), self.point_bottom.y()) |
| 175 | self.lineItem.show() |
| 176 | self.toolTipWidget.show("", points, event.pos() + QPoint(20, 20)) |
| 177 | else: |
| 178 | self.toolTipWidget.hide() |
| 179 | self.lineItem.hide() |
| 180 | |
| 181 | def onSeriesHoverd(self, point, state): |
| 182 | if state: |
| 183 | try: |
| 184 | name = self.sender().name() |
| 185 | except: |
| 186 | name = "" |
| 187 | QToolTip.showText(QCursor.pos(), "%s\nx: %s\ny: %s" % |