ADX by langshen

Explanation of the Code in TradingView
This Pine Script™ code is designed to create a custom indicator called "ADX with Custom Line by langshen". It combines the Average Directional Index (ADX) with additional features like a custom horizontal line, background highlighting, and alert conditions. Below is a detailed explanation of the code:

Indicator Overview
Name: ADX with Custom Line by langshen
Short Title: ADX+Line
Overlay: No (displayed in a separate pane below the chart)
Key Features
ADX Calculation:

The ADX, +DI, and -DI are calculated using the ta.dmi function.
Users can adjust the ADX Length and ADX Smoothing parameters.
Custom Horizontal Line:

A horizontal line is drawn at a user-defined value (default: 30).
Users can customize the line's color, width, and style (solid, dotted, or dashed).
Background Highlighting:

The background is highlighted with a purple color when the ADX value is above the custom horizontal line.
The transparency of the background highlight can be adjusted.
Alert Conditions:

Alerts are triggered when the ADX crosses above or crosses below the custom horizontal line.