逐步完成前后端服务器

frontend/node_modules/zrender/lib/contain/polygon.js

@@ -0,0 +1,22 @@
+import windingLine from './windingLine.js';
+var EPSILON = 1e-8;
+function isAroundEqual(a, b) {
+    return Math.abs(a - b) < EPSILON;
+}
+export function contain(points, x, y) {
+    var w = 0;
+    var p = points[0];
+    if (!p) {
+        return false;
+    }
+    for (var i = 1; i < points.length; i++) {
+        var p2 = points[i];
+        w += windingLine(p[0], p[1], p2[0], p2[1], x, y);
+        p = p2;
+    }
+    var 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;
+}