add treeWidget Demo

Qpyqtgraph/README.md

@@ -7,5 +7,14 @@
 - 3、pyqtgraph如何禁止左键，右键，滑轮事件功能
 - 4、使用QScrollArea后添加pg.PlotWidget()不能选择图片尺寸问题。
 - 5、多图共享轴（Difficult）
+- 6、pg.PlotWidget()鼠标获取X轴坐标
 
 - 目录
+  - [pg.PlotWidget()鼠标获取X轴坐标](#1、pg.PlotWidget()鼠标获取X轴坐标)
+  
+ ## 1、Sqlalchemy动态拼接字段查询显示表格
+[运行 mouseFlow.py](mouseFlow.py)
+
+移动鼠标获取X轴坐标
+
+![mouseFlow](ScreenShot/mouseFlow.gif)

Qpyqtgraph/mouseFlow.py

@@ -0,0 +1,44 @@
+#!/usr/bin/env python
+# encoding: utf-8
+'''
+Created on 2017年5月2日
+@author: weike32
+@site: https://pyqt5.com ,https://github.com/weike32
+@email: 394967319@qq.com
+@file: CopyContent
+@description: 查阅了很多博客，如果有异，可以联系作者邮箱。本Demo仅作学习参考用，保有后续相关权益。
+'''
+import sys
+from PyQt5.QtWidgets import QApplication, QMainWindow
+from PyQt5 import QtCore
+import numpy as np
+import pyqtgraph as pg
+
+class Ui_Form(object):
+    def setupUi(self, Form):
+        Form.setObjectName("Form")
+        Form.resize(726, 595)
+        self.graphicsView = pg.PlotWidget(Form)
+        self.graphicsView.setGeometry(QtCore.QRect(75, 131, 621, 441))
+        self.graphicsView.setObjectName("graphicsView")
+
+class MyWindow(QMainWindow, Ui_Form):
+    def __init__(self, parent=None):
+        super(MyWindow, self).__init__(parent)
+        self.setupUi(self)
+        x = np.linspace(-100, 100, 1000)
+        data = np.sin(x) / x
+        self.graphicsView.plot(data, pen=(255, 255, 255, 200))
+        self.label = pg.TextItem(text="横坐标：{}".format(0))
+        self.graphicsView.addItem(self.label)
+        self.setMouseTracking(True)
+        self.graphicsView.scene().sigMouseMoved.connect(self.onMouseMoved)
+    def onMouseMoved(self, evt):
+        if self.graphicsView.plotItem.vb.mapSceneToView(evt):
+            point =self.graphicsView.plotItem.vb.mapSceneToView(evt)
+            self.label.setHtml("<p style='color:white'>横坐标：{0}</p>".format(point.x()))
+if __name__ == '__main__':
+    app = QApplication(sys.argv)
+    myWin = MyWindow()
+    myWin.show()
+    sys.exit(app.exec_())