测试

frontend/node_modules/zrender/src/contain/polygon.ts

@@ -0,0 +1,31 @@
+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;
+}