{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "import panel as pn\n",
    "\n",
    "pn.extension()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "The ``LinearGauge`` is a value indicator providing a visual representation of a value in a certain range as a simple linear gauge. It is similar to `Dial` and `Gauge` elements but visually more compact.\n",
    "\n",
    "#### Parameters:\n",
    "\n",
    "For layout and styling related parameters see the [customization user guide](../../user_guide/Customization.ipynb).\n",
    "\n",
    "* **``bounds``** (tuple, default=(0, 100)): The upper and lower bound of the dial.\n",
    "* **``colors``** (list): Color thresholds for the gauge, specified as a list of evenly spaced colors or  tuples of the fractional threshold and the color to switch to.\n",
    "* **``default_color``** (str, default='lightblue'): Color to use if no color threshold are supplied to the `color` parameter\n",
    "* **``format``** str(str, default='{value}%'): Formatting string for the value indicator.\n",
    "* **``nan_format``** str(str, default='-'): How to format nan values.\n",
    "* **``needle_color``** (str, default='black): Color of the needle.\n",
    "* **``show_boundaries``** (boolean, default=False): Whether to show transitions between colors.\n",
    "* **``tick_size``** (int): Font size of the tick labels.\n",
    "* **``title_size``** (int): Font size of the title.\n",
    "* **``unfilled_color``** (str, default='whitesmoke'): Color of the unfilled region of the LinearGauge\n",
    "* **``value``** (float or int, default=25): Value to indicate on the dial a value within the declared bounds.\n",
    "* **``value_size``** (str): Font size of value label.\n",
    "\n",
    "___"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "The simplest form of a `LinearGauge` just requires setting a `value` which must be within the `bounds`. The default formatter and bounds assume you are providing a percentage:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "pn.indicators.LinearGauge(name='Failure Rate', value=30, bounds=(0, 100))"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "If we want to display some other value such as the revolutions per minute of an engine we can set a different `bounds` value and override the `format`. Additionally we may also provide a different set of colors defining the threshold points at which the color should change as a fraction of the provided bounds. The `colors` accepts a list of tuples defining the fractions and the color:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "pn.indicators.LinearGauge(\n",
    "    name='Engine', value=2500, bounds=(0, 3000), format='{value:.0f} rpm',\n",
    "    colors=['green', 'gold', 'red'], horizontal=True, width=125\n",
    ")"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "If we want to show the transition points between the different colors we can also enable `show_boundaries`:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "pn.indicators.LinearGauge(\n",
    "    name='Engine', value=2800, bounds=(0, 3000), format='{value:.0f} rpm',\n",
    "    colors=[(0.2, 'green'), (0.8, 'gold'), (1, 'red')], show_boundaries=True\n",
    ")"
   ]
  }
 ],
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