逐步完成前后端服务器

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

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+import { normalizeRadian } from './util.js';
+var PI2 = Math.PI * 2;
+export function containStroke(cx, cy, r, startAngle, endAngle, anticlockwise, lineWidth, x, y) {
+    if (lineWidth === 0) {
+        return false;
+    }
+    var _l = lineWidth;
+    x -= cx;
+    y -= cy;
+    var d = Math.sqrt(x * x + y * y);
+    if ((d - _l > r) || (d + _l < r)) {
+        return false;
+    }
+    if (Math.abs(startAngle - endAngle) % PI2 < 1e-4) {
+        return true;
+    }
+    if (anticlockwise) {
+        var tmp = startAngle;
+        startAngle = normalizeRadian(endAngle);
+        endAngle = normalizeRadian(tmp);
+    }
+    else {
+        startAngle = normalizeRadian(startAngle);
+        endAngle = normalizeRadian(endAngle);
+    }
+    if (startAngle > endAngle) {
+        endAngle += PI2;
+    }
+    var angle = Math.atan2(y, x);
+    if (angle < 0) {
+        angle += PI2;
+    }
+    return (angle >= startAngle && angle <= endAngle)
+        || (angle + PI2 >= startAngle && angle + PI2 <= endAngle);
+}