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Formulary](https://edwilliams.org/avform.htm#Intermediate) algorithms\n\n## Installation\n\n```bash\nnpm install arc\n```\n\n## Quick Start\n\n```js\nimport { GreatCircle } from 'arc';\nconst gc = new GreatCircle({x: -122, y: 48}, {x: -77, y: 39});\nconst line = gc.Arc(); // npoints is optional, defaults to 100\nconsole.log(line.json()); // GeoJSON output\n```\n\n### TypeScript\n```typescript\nimport { GreatCircle, CoordinatePoint } from 'arc';\n\nconst start: CoordinatePoint = { x: -122, y: 48 };\nconst end: CoordinatePoint = { x: -77, y: 39 };\nconst gc = new GreatCircle(start, end);\nconst line = gc.Arc(100);\n```\n\n### Browser (ESM)\n```html\n\n```\n\n## API Reference\n\n### Basic Usage\n\n#### 1. Define coordinates\nCoordinates use `x` for longitude and `y` for latitude (both in degrees):\n\n```js\nconst start = { x: -122, y: 48 }; // Seattle\nconst end = { x: -77, y: 39 }; // Washington DC\n```\n\n#### 2. Create a GreatCircle\n```js\nconst gc = new GreatCircle(start, end, { name: 'Seattle to DC' });\n```\n\n#### 3. Generate the arc\n```js\nconst line = gc.Arc(); // defaults to 100 points\nconst line = gc.Arc(500); // or specify a custom value\n```\n\n**Parameters:**\n- `npoints` (number, optional): Number of intermediate points (higher = more precise, default: 100)\n\n### TypeScript Support\n\n```typescript\nimport { GreatCircle, CoordinatePoint, ArcOptions } from 'arc';\n\n// Define custom properties interface\ninterface RouteProperties {\n name: string;\n color?: string;\n}\n\nconst start: CoordinatePoint = { x: -122, y: 48 };\nconst end: CoordinatePoint = { x: -77, y: 39 };\nconst properties: RouteProperties = { name: 'Seattle to DC', color: 'blue' };\n\nconst gc = new GreatCircle(start, end, properties);\nconst line = gc.Arc(); // npoints is optional, defaults to 100\n\n// Fully typed return values\nconst geojson = line.json(); // GeoJSONFeature\nconst wkt = line.wkt(); // string\n```\n\n**Available Types:** `CoordinatePoint`, `ArcOptions`, `Coord`, `GreatCircle`, `Arc`, `GeoJSONFeature`\n\n### Output Formats\n\n#### Raw Arc Object\nThe generated arc contains intermediate coordinate pairs:\n\n```js\n{\n properties: { name: 'Seattle to DC' },\n geometries: [\n {\n coords: [\n [-122, 48],\n [-112.06162, 47.724167],\n [-102.384043, 46.608132],\n [-93.227189, 44.716217],\n [-84.74824, 42.144155],\n [-77, 39]\n ],\n length: 6\n }\n ]\n}\n```\n\n#### GeoJSON Format\n```js\nconst geojson = line.json();\n// Returns:\n{\n type: 'Feature',\n geometry: {\n type: 'LineString',\n coordinates: [[-122, 48], [-112.06162, 47.724167], ...]\n },\n properties: { name: 'Seattle to DC' }\n}\n```\n\n#### WKT Format\n```js\nconst wkt = line.wkt();\n// Returns:\n'LINESTRING(-122 48,-112.061619 47.724167,-102.384043 46.608131,...)'\n```\n\n### Dateline Crossing\n\nRoutes that cross the international dateline are automatically detected and split into a `MultiLineString` with exact `±180°` boundary points. No configuration is needed.\n\n## Examples\n\nSee the [interactive demo](https://danespringmeyer.com/arc.js/) for sample code showing how to create GeoJSON feature collections from multiple routes.\n\n## Used in Turf.js\n\narc.js powers the [`greatCircle`](https://turfjs.org/docs/api/greatCircle) function in [Turf.js](https://turfjs.org/), a popular geospatial JavaScript library. You can use great circle calculations directly through Turf:\n\n## License\n\nThis project is licensed under the BSD license. See [LICENSE.md](LICENSE) for details.\n","readmeFilename":"README.md","users":{"huriatiputri":true},"license":"BSD"}