trying to get data co-ordinate from mouseclick in PyqtGraph

[Pramod Butte]

I am new to PyqtGraph ( Infact this is my first time)

I have a Qt designer file which I import in my python code. I 6 windows in which I plot a 42x22 (different sizes) as an inmage, these have been promoted the graphicview. 

I have a data set which is 6x42x22 and so I use a for loop to plot the 6 images

 for n in range(imageStackSize):

            self.glayout = pg.GraphicsLayout()

            self.vb = self.glayout.addViewBox()

            self.vb.setAspectLocked(lock=True, ratio=self.aspect_ratio)

            img_temp = image[n, :, :]

            img = pg.ImageItem(img_temp,  lut=self.jet_lut)

            if n == 0:

                self.ui.Channel1_img.setCentralItem(self.glayout)

                self.vb.addItem(img)

            elif n == 1:

                self.ui.Channel2_img.setCentralItem(self.glayout)

                self.vb.addItem(img)

            elif n == 2:

                self.ui.Channel3_img.setCentralItem(self.glayout)

                self.vb.addItem(img)

            elif n == 3:

                self.ui.Channel4_img.setCentralItem(self.glayout)

                self.vb.addItem(img)

            elif n == 4:

                self.ui.Channel5_img.setCentralItem(self.glayout)

                self.vb.addItem(img)

            elif n == 5:

                self.ui.Channel6_img.setCentralItem(self.glayout)

                self.vb.addItem(img)

After this I am trying to click on one of the image (ideally I would like to make it such that I can click any of the six images) to get the (6,x,y) coordinated the first dimension does not matter. In order to achieve this I did

        self.ui.Channel1_img.scene().sigMouseClicked.connect(self.onClick)

        #self.ui.Channel2_img.scene().sigMouseClicked.connect(self.onClick)

        #self.ui.Channel3_img.scene().sigMouseClicked.connect(self.onClick)

        #self.ui.Channel4_img.scene().sigMouseClicked.connect(self.onClick)

        #self.ui.Channel5_img.scene().sigMouseClicked.connect(self.onClick)

        #self.ui.Channel6_img.scene().sigMouseClicked.connect(self.onClick)

        #self.ui.PMTVoltage_plt.scene().sigMouseClicked.connect(self.onClick)

 def onClick(self, event):

        print("clicked")

        

and then I tried 

        items = self.ui.Channel1_img.imageItem.mapFromViewToItem(event.pos())

and

        items = self.ui.Channel1_img.imageItem.mapFromSceneToView(event.pos())

 

 but the prog just crashes. I read somewhere that the coordinates are in the viewbox, but I cant seem to find the viewbox or vb in the self.ui.Channel1_img

what am I missing? Any help is appreciated

thanks,

Pramod

[Pramod Butte]

Just add I went through the entire ui variable in debug to look for vb or image Item and could not find it.

infact the only thing I found was,

items = {dict} {<pyqtgraph.graphicsItems.ViewBox.ViewBox.ViewBox object at 0x000001CF73888CA8>: [(0, 0)]}

 <pyqtgraph.graphicsItems.ViewBox.ViewBox.ViewBox object at 0x000001CF73888CA8> (1990508186792) = {list} <class 'list'>: [(0, 0)]

  0 = {tuple} <class 'tuple'>: (0, 0)

   0 = {int} 0

   1 = {int} 0

   __len__ = {int} 2

  __len__ = {int} 1

 __len__ = {int} 1

[Pramod Butte]

ok I managed to figure it out and posting here if some else has the same question

I changed the plotting to imageItem

Enter code here...vb = pg.ViewBox()

        self.ui.PMTVoltage_plt.useOpenGL()

        self.ui.PMTVoltage_plt.setCentralItem(vb)

        self.img = pg.ImageItem(pmtImage)

        vb.addItem(self.img)

and then got the vb back in other function using

Enter code here...vb = self.ui.PMTVoltage_plt.getViewBox()

        items = vb.mapSceneToView(event.scenePos())

        pixels = vb.mapFromViewToItem(self.img, items)