python---- pyqt 十字光标
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# encoding: UTF-8 import sys,os import pyqtgraph as pg import datetime as dt import numpy as np import traceback from pyqtgraph.Qt import QtGui, QtCore from pyqtgraph.Point import Point ######################################################################## # 十字光标支持 ######################################################################## class CrosshairTool(QtCore.QObject): """ 此类给pg.PlotWidget()添加crossHair功能,PlotWidget实例需要初始化时传入 """ signal = QtCore.pyqtSignal(type(tuple([]))) #---------------------------------------------------------------------- def __init__( self,pw,xAxis,viwe,parent=None): self.__view = viwe self.pw=pw self.xData=xAxis super(CrosshairTool, self).__init__() self.xAxis = 0 self.yAxis = 0 # 在y轴动态mid跟随最新价显示最新价和最新时间 self.rects = [self.__view.vb.sceneBoundingRect()] self.__textDate = pg.TextItem() self.__textSig=pg.TextItem() self.__textDate.setZValue(2) self.__textSig.setZValue(2) # 注册十字光标 self.vLine = pg.InfiniteLine(angle=90, movable=False) self.hLine = pg.InfiniteLine(angle=0, movable=False) self.vLine.setPos(0) self.hLine.setPos(0) self.__view.vb.addItem(self.vLine, ignoreBounds=True) self.__view.vb.addItem(self.hLine, ignoreBounds=True) self.__view.vb.addItem(self.__textDate, ignoreBounds=True) self.__view.vb.addItem(self.__textSig, ignoreBounds=True) self.proxy = pg.SignalProxy(self.pw.scene().sigMouseMoved, rateLimit=60, slot=self.mouseMoved) # 跨线程刷新界面支持 self.signal.connect(self.update) # ---------------------------------------------------------------------- def update(self, pos): """刷新界面显示""" xAxis, yAxis = pos xAxis, yAxis = (self.xAxis, self.yAxis) if xAxis is None else (xAxis, yAxis) self.moveTo(xAxis, yAxis) # ---------------------------------------------------------------------- def mouseMoved(self, evt): pos = evt[0] ## using signal proxy turns original arguments into a tuple self.rects = [self.__view.vb.sceneBoundingRect()] # if self.pw.sceneBoundingRect().contains(pos): mousePoint = self.__view.vb.mapSceneToView(pos) xAxis = mousePoint.x() yAxis = mousePoint.y() self.moveTo(xAxis, yAxis) # ---------------------------------------------------------------------- def moveTo(self, xAxis, yAxis): xAxis, yAxis = (self.xAxis, self.yAxis) if xAxis is None else (xAxis, yAxis) self.rects = [self.__view.sceneBoundingRect() ] if not xAxis or not yAxis: return self.xAxis = xAxis self.yAxis = yAxis self.vhLinesSetXY(xAxis, yAxis) self.plotVolue(xAxis,yAxis) # ---------------------------------------------------------------------- def vhLinesSetXY(self, xAxis, yAxis): """水平和竖线位置设置""" self.vLine.setPos(xAxis) self.hLine.setPos(yAxis) # ---------------------------------------------------------------------- def plotVolue(self,xAxis,yAxis): if self.xData: if int(round(xAxis)) <=len(self.xData)-1: xValue =self.xData[int(round(xAxis))] elif int(xAxis)>len(self.xData)-1: xValue=self.xData[len(self.xData)-1] else: xValue = self.xData[int(xAxis)] if (isinstance(xValue, dt.datetime)): xValueText = dt.datetime.strftime(xValue, ‘%Y-%m-%d %H:%M:%S‘) elif (isinstance(xValue, (str))): xValueText = xValue elif (isinstance(xValue, (int))): xValueText = xValue else: xValueText = "" else: xValueText=xAxis self.__textDate.setHtml( ‘<div style="text-align: center"> <span style="color: yellow; font-size: 20px;">x=%s</span> </div>‘ % (xValueText)) self.__textSig.setHtml( ‘<div style="text-align: right"> <span style="color: yellow; font-size: 20px;">y=%0.2f</span> </div>‘ % (yAxis)) # y,右上角显示 rightAxis = self.__view.getAxis(‘right‘) rightAxisWidth = rightAxis.width() rectTextsig = self.__textDate.boundingRect() rectTextsigwidth = rectTextsig.width() topRight = self.__view.vb.mapSceneToView( QtCore.QPointF(self.rects[0].width() - (rightAxisWidth+rectTextsigwidth), self.rects[0].top()))
if yAxis<self.rects[0].top(): self.__textSig.anchor=Point((1,1)); else: self.__textSig.anchor = Point((1, 0));
self.__textSig.setPos(topRight.x(), yAxis) # X坐标 rectTextDate = self.__textDate.boundingRect() rectTextDateHeight = rectTextDate.height() bottomAxis = self.__view.getAxis(‘bottom‘) bottomAxisHeight = bottomAxis.height() bottomRight = self.__view.vb.mapSceneToView(QtCore.QPointF(self.rects[0].width(), self.rects[0].bottom() - ( bottomAxisHeight + rectTextDateHeight)))
# # 修改对称方式防止遮挡 if xAxis >self.rects[0].width(): self.__textDate.anchor = Point((1, 0)) else: self.__textDate.anchor = Point((0, 0))
self.__textDate.setPos(xAxis, bottomRight.y())
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