Getting the hang of mouse events for drawing purposes

[Friedrich]

Hi all

I am currently trying/struggling with the mouse interaction... I might have just passed the correct lines in the documentation but i just can't get it to work. What I want to achieve is getting the starting positon (mouse button pressed), the moving event (hovering...) and when I am finished dragging the mouse (mouse button release).

The following is a very crude MWE... can somebody help?

#!/usr/bin/env python

import sys

from PyQt5.QtWidgets import QApplication, QMainWindow, QToolBar, QAction

import pyqtgraph as pqg

class Builder(QMainWindow):

    def __init__(self, parent=None):

       super(Builder, self).__init__(parent)

       self.setupWidget()

   

   def setupWidget(self):

       self.toolbar = Toolbar(self)

       self.addToolBar(self.toolbar)

        self.win = pqg.GraphicsWindow()

       self.canvas = self.win.addPlot(row=1, col=0)

       self.canvas.showGrid(x=True, y=True)

        self.scene = self.canvas.scene()

       self.scene.sigMouseHover.connect(self.onMouseHover)

       self.scene.sigMouseClicked.connect(self.onMouseClick)

       print(self.scene.parent)

       print(dir(self.scene))

       

       self.setCentralWidget(self.win)

    def onMouseMove(self, events):

       print("MOVE", events)

       pos = events[0]

       x = self.canvas.vb.mapSceneToView(pos).x()

       y = self.canvas.vb.mapSceneToView(pos).y()

       # print(x, y)

    def onMouseClick(self, events):

       print("LENGTH", len(self.scene.clickEvents))

       print("CLICK", events)

       evts = self.scene.clickEvents

       print(evts)

       # for ev in evts:

       #     print(ev.pos())

       #     print(ev.lastPos())

    def onMouseHover(self, events):

       print("LENGTH", len(self.scene.clickEvents))

       print("HOVER", events)

       evts = self.scene.clickEvents

       print(evts)

       # for ev in evts:

       #     print(ev.pos())

       #     print(ev.lastPos())

   

class Toolbar(QToolBar):

    def __init__(self, parent=None):

       """."""

       super(Toolbar, self).__init__(parent)

       self.setupWidget()

   

   def setupWidget(self):

       self.setMovable(True)

       self.setFloatable(True)

       self.rect = QAction("rect", checkable=True)

        self.addAction(self.rect)

if __name__ == '__main__':

   app = QApplication(sys.argv)

   app.setApplicationName("hulk_mad.py")

    main = Builder()

   main.show()

    sys.exit(app.exec_())

:-/ .. I have to confess that I am a biiiiiit frustrated