Dependency Analysis

Relevant source files

The following files were used as context for generating this wiki page:

• package.json
• README.md
• src/index.js
• src/perpendicular-distance.js
• src/distance.js

The geo-path-reducer project is a lightweight JavaScript library designed to simplify geographical paths using the Douglas-Peucker algorithm. Dependency analysis of this project reveals a highly modular structure with zero external runtime dependencies, relying instead on internal functional decomposition to handle geometric calculations and path recursion.

Sources: package.json, README.md:1-5

Internal Module Architecture

The project is structured as an ES module, where the logic is divided into specialized utility files. The main entry point orchestrates the simplification process by delegating specific mathematical tasks to child modules.

Component Hierarchy

The system follows a strict hierarchical flow where the core algorithm depends on geometric primitives:

1. Main Entry (src/index.js): Implements the recursive Douglas-Peucker logic.
2. Geometry Utility (src/perpendicular-distance.js): Calculates the distance of a point from a line segment.
3. Core Math (src/distance.js): Implements the Haversine formula for great-circle distance between two coordinates.

The following diagram illustrates the internal dependency flow:

Functional Dependencies

Main Algorithm: geoPathReducer

The geoPathReducer function is the primary exported interface. It takes an array of points and an epsilon threshold. It utilizes perpendicularDistance to identify the most deviant point in a path segment to determine if recursion is necessary.

Parameter	Type	Description
points	Array	Array of objects with lat and lng properties.
epsilon	Number	Maximum distance tolerance for simplification.

Sources: src/index.js:3-23, README.md:25-30

Geometric Utilities

The algorithm's accuracy depends on two specific mathematical modules:

• perpendicular-distance.js: Uses Heron's formula to find the height of a triangle formed by the start, end, and current point, effectively giving the perpendicular distance.
• distance.js: Calculates the great-circle distance in kilometers using the Earth's radius (6371 km).

Project Metadata and Environment

The project is configured as a modern JavaScript environment using ES modules. It defines no dependencies or devDependencies in its configuration, emphasizing its role as a standalone mathematical utility.

Configuration Overview

Field	Value	Description
name	geo-path-reducer	Project identifier.
main	src/index.js	Entry point for the module.
type	module	Defines the use of ES6 imports/exports.
license	MIT	Permissive software license.

Sources: package.json:2-12

Conclusion

The dependency analysis of geo-path-reducer shows a clean, decoupled architecture. By separating the Douglas-Peucker recursion from the Haversine and perpendicular distance math, the library maintains high readability and narrow focus. It operates without external library dependencies, making it highly portable for web and Node.js environments.