bd028579
 易尊强
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import windingLine from './windingLine';
import { VectorArray } from '../core/vector';
const EPSILON = 1e-8;
function isAroundEqual(a: number, b: number): boolean {
return Math.abs(a - b) < EPSILON;
}
export function contain(points: VectorArray[], x: number, y: number) {
let w = 0;
let p = points[0];
if (!p) {
return false;
}
for (let i = 1; i < points.length; i++) {
const p2 = points[i];
w += windingLine(p[0], p[1], p2[0], p2[1], x, y);
p = p2;
}
// Close polygon
const p0 = points[0];
if (!isAroundEqual(p[0], p0[0]) || !isAroundEqual(p[1], p0[1])) {
w += windingLine(p[0], p[1], p0[0], p0[1], x, y);
}
return w !== 0;
}
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