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      "source": [
        "%gui qt"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "\n# Shape Visuals\n\nDemonstration of PolygonVisual, EllipseVisual, RectangleVisual\nand RegularPolygon\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "from vispy import app\nimport sys\nfrom vispy.scene import SceneCanvas\nfrom vispy.scene.visuals import Polygon, Ellipse, Rectangle, RegularPolygon\nfrom vispy.color import Color\n\nwhite = Color(\"#ecf0f1\")\ngray = Color(\"#121212\")\nred = Color(\"#e74c3c\")\nblue = Color(\"#2980b9\")\norange = Color(\"#e88834\")\n\ncanvas = SceneCanvas(keys='interactive', title='Polygon Example',\n                     show=True)\nv = canvas.central_widget.add_view()\nv.bgcolor = gray\nv.camera = 'panzoom'\n\ncx, cy = (0.2, 0.2)\nhalfx, halfy = (0.1, 0.1)\n\npoly_coords = [(cx - halfx, cy - halfy),\n               (cx + halfx, cy - halfy),\n               (cx + halfx, cy + halfy),\n               (cx - halfx, cy + halfy)]\npoly = Polygon(poly_coords, color=red, border_color=white,\n               border_width=3, parent=v.scene)\n\nellipse = Ellipse(center=(0.4, 0.2), radius=(0.1, 0.05),\n                  color=blue, border_width=2, border_color=white,\n                  num_segments=1,\n                  parent=v.scene)\n\nellipse.num_segments = 10\nellipse.start_angle = 0\nellipse.span_angle = 120\n\nrect = Rectangle(center=(0.6, 0.2), width=0.1, height=0.2,\n                 color=orange, border_color=white,\n                 radius=0.02, parent=v.scene)\n\nregular_poly = RegularPolygon(center=(0.8, 0.2),\n                              radius=0.1, sides=6, color=blue,\n                              border_color=white, border_width=2,\n                              parent=v.scene)\nif __name__ == '__main__':\n    if sys.flags.interactive != 1:\n        app.run()"
      ]
    }
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