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      "source": [
        "%gui qt"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "\n# Display an Image\n\nSimple use of SceneCanvas to display an Image.\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
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      "source": [
        "import sys\nfrom vispy import scene\nfrom vispy import app\nfrom vispy.io import load_data_file, read_png\n\ncanvas = scene.SceneCanvas(keys='interactive')\ncanvas.size = 800, 600\ncanvas.show()\n\n# Set up a viewbox to display the image with interactive pan/zoom\nview = canvas.central_widget.add_view()\n\n# Create the image\nimg_data = read_png(load_data_file('mona_lisa/mona_lisa_sm.png'))\ninterpolation = 'nearest'\n\nimage = scene.visuals.Image(img_data, interpolation=interpolation,\n                            parent=view.scene, method='subdivide')\n\ncanvas.title = 'Spatial Filtering using %s Filter' % interpolation\n\n# Set 2D camera (the camera will scale to the contents in the scene)\nview.camera = scene.PanZoomCamera(aspect=1)\n# flip y-axis to have correct aligment\nview.camera.flip = (0, 1, 0)\nview.camera.set_range()\nview.camera.zoom(0.1, (250, 200))\n\n# get interpolation functions from Image\nnames = image.interpolation_functions\nnames = sorted(names)\nact = 17\n\n\n# Implement key presses\n@canvas.events.key_press.connect\ndef on_key_press(event):\n    global act\n    if event.key in ['Left', 'Right']:\n        if event.key == 'Right':\n            step = 1\n        else:\n            step = -1\n        act = (act + step) % len(names)\n        interpolation = names[act]\n        image.interpolation = interpolation\n        canvas.title = 'Spatial Filtering using %s Filter' % interpolation\n        canvas.update()\n\n\nif __name__ == '__main__' and sys.flags.interactive == 0:\n    app.run()"
      ]
    }
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