PyQt/QGraphicsView练习/QChartToolTipTest.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

'''
Created on 2017年12月23日
@author: Irony."[讽刺]
@site: http://alyl.vip, http://orzorz.vip, https://coding.net/u/892768447, https://github.com/892768447
@email: 892768447@qq.com
@file: QChartToolTipTest
@description: 
'''
import random
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"

m_listCount = 3
m_valueMax = 10
m_valueCount = 7


def generateRandomData(listCount, valueMax, valueCount):
    random.seed()
    dataTable = []
    for i in range(listCount):
        dataList = []
        yValue = 0.0
        f_valueCount = float(valueCount)
        for j in range(valueCount):
            yValue += random.uniform(0, valueMax) / f_valueCount
            value = j + random.random() * m_valueMax / f_valueCount, yValue
            label = "Slice " + str(i) + ":" + str(j)
            dataList.append((value, label))
        dataTable.append(dataList)
    return dataTable


m_dataTable = generateRandomData(m_listCount, m_valueMax, m_valueCount)


'''
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()

    def mouseMoveEvent(self, event):
        super(ChartView, self).mouseMoveEvent(event)
        # 获取x和y轴的最小最大值
        axisX, axisY = self._chart.axisX(), self._chart.axisY()
        min_x, max_x = axisX.min(), axisX.max()
        min_y, max_y = axisY.min(), axisY.max()
        # 坐标系中左上角顶点
        point_top = self._chart.mapToPosition(QPointF(min_x, max_y))
        # 坐标原点坐标
        point_bottom = self._chart.mapToPosition(QPointF(min_x, min_y))
        step_x = (max_x - min_x) / (axisX.tickCount() - 1)
        step_y = (max_y - min_y) / (axisY.tickCount() - 1)
        # 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()
#         print(x, y, step_x, step_y, event.pos())
        r_x = x / step_x
        r_y = y / step_y  # @UnusedVariable
        index = round(r_x) - 1  # 四舍五入
#         print(r_x, r_y, index, step_x, step_y)
        # 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 min_x <= x <= max_x and min_y <= y <= max_y]
        if points:
            # 跟随鼠标的黑线条
            self.lineItem.setLine(event.pos().x(), point_top.y(),
                                  event.pos().x(), 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)
        for i, data_list in enumerate(m_dataTable):
            series = QLineSeries(self._chart)
            for value, _ in data_list:
                series.append(*value)
            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.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_())