"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"import numpy as np\n",
"import holoviews as hv\n",
"from holoviews import opts\n",
"hv.extension('bokeh')"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"A ``Box`` is an annotation that takes a center x-position, a center y-position and a size:"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"data = np.sin(np.mgrid[0:100,0:100][1]/10.0)\n",
"data[np.arange(40, 60), np.arange(20, 40)] = -1\n",
"data[np.arange(40, 50), np.arange(70, 80)] = -3 \n",
"example = hv.Image(data) * hv.Box(-0.2, 0, 0.25 ) * hv.Box(-0, 0, (0.4,0.9) )\n",
"example.opts(\n",
" opts.Box(color='red', line_width=5), \n",
" opts.Image(cmap='gray'))"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"In addition to these arguments, it supports an optional ``aspect ratio``:\n",
"\n",
"By default, the size argument results in a square such as the small square shown above. Alternatively, the size can be given as the tuple ``(width, height)`` resulting in a rectangle. If you only supply a size value, you can still specify a rectangle by specifying an optional aspect value. In addition, you can also set the orientation (in radians, rotating anticlockwise):"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"data = np.sin(np.mgrid[0:100,0:100][1]/10.0)\n",
"data[np.arange(30, 70), np.arange(30, 70)] = -3\n",
"example = hv.Image(data) * hv.Box(-0, 0, 0.25, aspect=3, orientation=-np.pi/4)\n",
"example.opts(\n",
" opts.Box(color='purple', line_width=5), \n",
" opts.Image(cmap='gray'))"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"For full documentation and the available style and plot options, use ``hv.help(hv.Box).``"
]
}
],
"metadata": {
"language_info": {
"name": "python",
"pygments_lexer": "ipython3"
}
},
"nbformat": 4,
"nbformat_minor": 2
}