{
  "cells": [
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "%matplotlib inline"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "# Timer\n\nThis script creates an instance of a ``DummyGrabber``\nand implements a timer with an interval of ``1000ms``.\n\nEverytime, the interval is expired the method ``imageAcquisition``\nis called. It acquires a new image an appends it to the global\nlist ``myImages``.\n\nTo stop the timer, call the method ``cancel``. Additionally, the timer\nis automatically interrupted after ``10`` iterations.\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "from itom import timer\nfrom itom import dataIO\nfrom itom import dataObject"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "Function for the image acquisition.\n\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "def imageAcquisition():\n    global iters\n    global t\n    global cam\n    global myImages\n\n    print(\"acquire next image\")\n    cam.acquire()\n    d = dataObject()\n    cam.getVal(d)\n    globals()[\"myImages\"].append(d.copy())\n    iters += 1\n    if iters >= 10:\n        t.stop()"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "Call this method (e.g. by your gui) to stop the timer.\n\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "def cancel():\n    global t\n    global cam\n    t.stop()\n    cam.stopDevice()"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "Define a ``DummyGrabber`` camera and timer for a timed acquisition.\n\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "cam = dataIO(\"DummyGrabber\")\nmyImages = []\niters = 0\ncam.startDevice()\nt = timer(1000, imageAcquisition)"
      ]
    }
  ],
  "metadata": {
    "kernelspec": {
      "display_name": "Python 3",
      "language": "python",
      "name": "python3"
    },
    "language_info": {
      "codemirror_mode": {
        "name": "ipython",
        "version": 3
      },
      "file_extension": ".py",
      "mimetype": "text/x-python",
      "name": "python",
      "nbconvert_exporter": "python",
      "pygments_lexer": "ipython3",
      "version": "3.8.10"
    }
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