QtChart Tooltip

[TaeJuneJoung]

import sys

from PyQt5.QtChart import QChartView, QChart, QLineSeries
from PyQt5.QtCore import Qt, QRectF, QPoint, QPointF
from PyQt5.QtGui import QPainter, QCursor
from PyQt5.QtWidgets import QApplication, QGraphicsProxyWidget, QLabel, \
    QWidget, QHBoxLayout, QVBoxLayout, QToolTip, QGraphicsLineItem

__Author__ = "By: Irony.\"[讽刺]\nQQ: 892768447\nEmail: 892768447@qq.com"
__Copyright__ = "Copyright (c) 2017 Irony.\"[讽刺]"
__Version__ = "Version 1.0"

'''
class CircleWidget(QGraphicsProxyWidget):

    def __init__(self, color, *args, **kwargs):
        super(CircleWidget, self).__init__(*args, **kwargs)
        label = QLabel()
        label.setMinimumSize(12, 12)
        label.setMaximumSize(12, 12)
        label.setStyleSheet(
            "border:1px solid green;border-radius:6px;background: %s;" % color)
        self.setWidget(label)

class TextWidget(QGraphicsProxyWidget):

    def __init__(self, text, *args, **kwargs):
        super(TextWidget, self).__init__(*args, **kwargs)
        self.setWidget(QLabel(text, styleSheet="color:white;"))

class GraphicsWidget(QGraphicsWidget):

    def __init__(self, *args, **kwargs):
        super(GraphicsWidget, self).__init__(*args, **kwargs)
#         self.setFlags(self.ItemClipsChildrenToShape)
        self.setZValue(999)
        layout = QGraphicsGridLayout(self)
        for row in range(6):
            layout.addItem(CircleWidget("red"), row, 0)
            layout.addItem(TextWidget("red"), row, 1)
        self.hide()

    def show(self, pos):
        self.setGeometry(pos.x(), pos.y(), self.size().width(),
                         self.size().height())
        super(GraphicsWidget, self).show()
'''

class ToolTipItem(QWidget):

    def __init__(self, color, text, parent=None):
        super(ToolTipItem, self).__init__(parent)
        layout = QHBoxLayout(self)
        layout.setContentsMargins(0, 0, 0, 0)
        clabel = QLabel(self)
        clabel.setMinimumSize(12, 12)
        clabel.setMaximumSize(12, 12)
        clabel.setStyleSheet("border-radius:6px;background: rgba(%s,%s,%s,%s);" % (
            color.red(), color.green(), color.blue(), color.alpha()))
        layout.addWidget(clabel)
        self.textLabel = QLabel(text, self, styleSheet="color:white;")
        layout.addWidget(self.textLabel)

    def setText(self, text):
        self.textLabel.setText(text)

class ToolTipWidget(QWidget):
    Cache = {}

    def __init__(self, *args, **kwargs):
        super(ToolTipWidget, self).__init__(*args, **kwargs)
        self.setAttribute(Qt.WA_StyledBackground, True)
        self.setStyleSheet(
            "ToolTipWidget{background: rgba(50,50,50,70);}")
        layout = QVBoxLayout(self)
        self.titleLabel = QLabel(self, styleSheet="color:white;")
        layout.addWidget(self.titleLabel)

    def updateUi(self, title, points):
        self.titleLabel.setText(title)
        for serie, point in points:
            if serie not in self.Cache:
                item = ToolTipItem(
                    serie.color(),
                    (serie.name() or "-") + ":" + str(point.y()), self)
                self.layout().addWidget(item)
                self.Cache[serie] = item
            else:
                self.Cache[serie].setText(
                    (serie.name() or "-") + ":" + str(point.y()))

class GraphicsProxyWidget(QGraphicsProxyWidget):

    def __init__(self, *args, **kwargs):
        super(GraphicsProxyWidget, self).__init__(*args, **kwargs)
        self.setZValue(999)
        self.tipWidget = ToolTipWidget()
        self.setWidget(self.tipWidget)
        self.hide()

    def show(self, title, points, pos):
        self.setGeometry(QRectF(pos, self.size()))
        self.tipWidget.updateUi(title, points)
        super(GraphicsProxyWidget, self).show()

class ChartView(QChartView):

    def __init__(self, *args, **kwargs):
        super(ChartView, self).__init__(*args, **kwargs)
        self.resize(800, 600)
        self.setRenderHint(QPainter.Antialiasing)  # 抗锯齿
        self.initChart()

        self.toolTipWidget = GraphicsProxyWidget(self._chart)

        # line
        self.lineItem = QGraphicsLineItem(self._chart)
        self.lineItem.setZValue(998)
        self.lineItem.hide()

        # 一些固定计算，减少mouseMoveEvent中的计算量
        # 获取x和y轴的最小最大值
        axisX, axisY = self._chart.axisX(), self._chart.axisY()
        self.min_x, self.max_x = axisX.min(), axisX.max()
        self.min_y, self.max_y = axisY.min(), axisY.max()
        # 坐标系中左上角顶点
        self.point_top = self._chart.mapToPosition(
            QPointF(self.min_x, self.max_y))
        # 坐标原点坐标
        self.point_bottom = self._chart.mapToPosition(
            QPointF(self.min_x, self.min_y))
        self.step_x = (self.max_x - self.min_x) / (axisX.tickCount() - 1)

    #         self.step_y = (self.max_y - self.min_y) / (axisY.tickCount() - 1)

    def mouseMoveEvent(self, event):
        super(ChartView, self).mouseMoveEvent(event)
        # 把鼠标位置所在点转换为对应的xy值
        x = self._chart.mapToValue(event.pos()).x()
        y = self._chart.mapToValue(event.pos()).y()
        index = round((x - self.min_x) / self.step_x)
        pos_x = self._chart.mapToPosition(
            QPointF(index * self.step_x + self.min_x, self.min_y))
        #         print(x, pos_x, index, index * self.step_x + self.min_x)
        # 得到在坐标系中的所有series的类型和点
        points = [(serie, serie.at(index))
                  for serie in self._chart.series() if self.min_x <= x <= self.max_x and self.min_y <= y <= self.max_y]
        if points:
            # 永远在轴上的黑线条
            self.lineItem.setLine(pos_x.x(), self.point_top.y(),
                                  pos_x.x(), self.point_bottom.y())
            self.lineItem.show()
            self.toolTipWidget.show("", points, event.pos() + QPoint(20, 20))
        else:
            self.toolTipWidget.hide()
            self.lineItem.hide()

    def onSeriesHoverd(self, point, state):
        if state:
            try:
                name = self.sender().name()
            except:
                name = ""
            QToolTip.showText(QCursor.pos(), "%s\nx: %s\ny: %s" %
                              (name, point.x(), point.y()))

    def initChart(self):
        self._chart = QChart(title="Line Chart")
        self._chart.setAcceptHoverEvents(True)
        dataTable = [
            [120, 132, 101, 134, 90, 230, 210],
            [220, 182, 191, 234, 290, 330, 310],
            [150, 232, 201, 154, 190, 330, 410],
            [320, 332, 301, 334, 390, 330, 320],
            [820, 932, 901, 934, 1290, 1330, 1320]
        ]
        for i, data_list in enumerate(dataTable):
            series = QLineSeries(self._chart)
            for j, v in enumerate(data_list):
                series.append(j, v)
            series.setName("Series " + str(i))
            series.setPointsVisible(True)  # 显示原点
            series.hovered.connect(self.onSeriesHoverd)
            self._chart.addSeries(series)
        self._chart.createDefaultAxes()  # 创建默认的轴
        self._chart.axisX().setTickCount(7)  # x轴设置7个刻度
        self._chart.axisY().setTickCount(7)  # y轴设置7个刻度
        self._chart.axisY().setRange(0, 1500)  # 设置y轴范围
        self.setChart(self._chart)

if __name__ == "__main__":
    app = QApplication(sys.argv)
    app.setStyleSheet("""QToolTip {
    border: none;
    padding: 5px;
    color: white;
    background: rgb(50,50,50);
    opacity: 100;
}""")
    view = ChartView()
    view.show()
    sys.exit(app.exec_())

출처 : https://gitlab.com/PyQt5/PyQt/blob/master/QtChart/ToolTip.py