@dataplan/pg
Version:
PostgreSQL step classes for Grafast
37 lines • 1.22 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.parseLine = parseLine;
exports.stringifyLine = stringifyLine;
const grafast_1 = require("grafast");
/**
* Parses the Postgres line syntax.
*
* https://www.postgresql.org/docs/current/datatype-geometric.html#DATATYPE-LINE
*/
function parseLine(f) {
if (f[0] === "{" && f[f.length - 1] === "}") {
const [A, B, C] = f
.slice(1, f.length - 1)
.split(",")
.map((f) => parseFloat(f));
// Lines have the form Ax + By + C = 0.
// So if y = 0, Ax + C = 0; x = -C/A or if A is 0 then C = 0, x can be anything
// If x = 0, By + C = 0; y = -C/B or if B is 0 then C = 0, y can be anything
return {
a: { x: A === 0 ? 1 : -C / A, y: 0 },
b: { x: 0, y: B === 0 ? 1 : -C / B },
};
}
else {
throw new grafast_1.SafeError(`Failed to parse line ${f}`);
}
}
/**
* Stringifies to the Postgres line syntax.
*
* https://www.postgresql.org/docs/current/datatype-geometric.html#DATATYPE-LINE
*/
function stringifyLine(line) {
return `${line.a.x},${line.a.y},${line.b.x},${line.b.y}`;
}
//# sourceMappingURL=line.js.map