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    {
      "cell_type": "code",
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      "source": [
        "%gui qt"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "\n# Changing Line Colors\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "import itertools\nimport numpy as np\n\nfrom vispy import app, scene\nfrom vispy.color import get_colormaps\nfrom vispy.visuals.transforms import STTransform\n\ncolormaps = itertools.cycle(get_colormaps())\n\n# vertex positions of data to draw\nN = 200\npos = np.zeros((N, 2), dtype=np.float32)\npos[:, 0] = np.linspace(10, 390, N)\npos[:, 1] = np.random.normal(size=N, scale=20, loc=0)\n\n\ncanvas = scene.SceneCanvas(keys='interactive', size=(400, 200), show=True)\n\n# Create a visual that updates the line with different colormaps\ncolor = next(colormaps)\nline = scene.Line(pos=pos, color=color, method='gl')\nline.transform = STTransform(translate=[0, 140])\nline.parent = canvas.central_widget\n\ntext = scene.Text(color, bold=True, font_size=24, color='w',\n                  pos=(200, 40), parent=canvas.central_widget)\n\n\ndef on_timer(event):\n    global colormaps, line, text, pos\n    color = next(colormaps)\n    line.set_data(pos=pos, color=color)\n    text.text = color\n\ntimer = app.Timer(.5, connect=on_timer, start=True)\n\n\nif __name__ == '__main__':\n    canvas.app.run()"
      ]
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