{
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    {
      "cell_type": "code",
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      "source": [
        "%matplotlib inline"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "# Matplotlib auto update\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "import matplotlib\nimport matplotlib.pyplot as plt\nfrom itomUi import ItomUi\nfrom itom import ui\n\nmatplotlib.use(\"module://mpl_itom.backend_itomagg\")\n\n\nclass MatplotGuiAutoUpdate(ItomUi):\n    def __init__(self):\n        ItomUi.__init__(\n            self,\n            \"matplotlibGuiAutoUpdate.ui\",\n            ui.TYPEWINDOW,\n            childOfMainWindow=True,\n            deleteOnClose=True,\n        )\n        # the deleteOnClose = True argument will not only hide the figure if the close-button is pressed,\n        # but also destroy it. Then, the destroyed signal is emitted, caught by the slot self.on_mainWindow_destroyed.\n        # This can be used, to delete certain things.\n\n        self.gui.btnStop[\"enabled\"] = False\n        self.timerID = None\n        self.counter = 1\n        self.fignum = (\n            max(\n                [\n                    0,\n                ]\n                + plt.get_fignums()\n            )\n            + 1\n        )  # guarantee to get a new matplotlib figure number\n\n        if not \"__version__\" in ItomUi.__dict__ or ItomUi.__version__ < \"2.1\":\n            # in earlier versions of itom, an auto-connection to methods of the gui itself was not possible.\n            # From ItomUi.__version__ >= 2.1 on, the dialog or window itself can be auto-connected by its\n            # object name.\n            self.gui.connect(\"destroyed()\", self.on_mainWindow_destroyed)\n\n    @ItomUi.autoslot(\"\")\n    def on_btnStart_clicked(self):\n        if self.timerID is None:\n            # start the timer that calls the method 'timeout' every 2 seconds\n            self.timerID = timer(2000, self.timeout)\n            self.timeout()\n        self.gui.btnStart[\"enabled\"] = False\n        self.gui.btnStop[\"enabled\"] = True\n\n    @ItomUi.autoslot(\"\")\n    def on_btnStop_clicked(self):\n        if not self.timerID is None:\n            # stop and delete the timer, if started\n            self.timerID.stop()\n            self.timerID = None\n        self.gui.btnStart[\"enabled\"] = True\n        self.gui.btnStop[\"enabled\"] = False\n\n    # for itom <= 2.1, this auto-slot will raise a runtime error, however it is manually connected in the constructor of this class.\n    @ItomUi.autoslot(\"\")\n    def on_mainWindow_destroyed(self):\n        \"\"\"The windows was closed and destroyed. Stop the timer and tell matplotlib to close the figure\"\"\"\n        if not self.timerID is None:\n            self.timerID.stop()\n            self.timerID = None\n        plt.close(self.fignum)\n\n    def timeout(self):\n        print(\"update plot\")\n\n        canvas = self.gui.matplotlibPlot  # Reference to matplotlibPlot widget\n        fig = plt.figure(num=self.fignum, canvas=canvas)\n\n        if len(fig.axes) == 0:\n            # create a new subplot in the figure\n            ax = fig.add_subplot(111)\n        else:\n            # reuse the existing first subplot\n            ax = fig.axes[0]\n            ax.clear()\n        \n        ax.imshow(dataObject.randN([100, 100], \"uint8\"), cmap=plt.cm.gray)\n        ax.set_title(\"title of plot [%i]\" % self.counter)\n        self.counter += 1\n        # Move left and bottom spines outward by 10 points\n        ax.spines[\"left\"].set_position((\"outward\", 10))\n        ax.spines[\"bottom\"].set_position((\"outward\", 10))\n        # Hide the right and top spines\n        ax.spines[\"right\"].set_visible(False)\n        ax.spines[\"top\"].set_visible(False)\n        # Only show ticks on the left and bottom spines\n        ax.yaxis.set_ticks_position(\"left\")\n        ax.xaxis.set_ticks_position(\"bottom\")\n        plt.show()\n\n    def show(self):\n        ret = self.gui.show()\n\n\nif __name__ == \"__main__\":\n    gui = MatplotGuiAutoUpdate()\n    gui.show()"
      ]
    }
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