逐步完成前后端服务器

frontend/node_modules/zrender/lib/graphic/helper/smoothBezier.js

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+import { min as v2Min, max as v2Max, scale as v2Scale, distance as v2Distance, add as v2Add, clone as v2Clone, sub as v2Sub } from '../../core/vector.js';
+export default function smoothBezier(points, smooth, isLoop, constraint) {
+    var cps = [];
+    var v = [];
+    var v1 = [];
+    var v2 = [];
+    var prevPoint;
+    var nextPoint;
+    var min;
+    var max;
+    if (constraint) {
+        min = [Infinity, Infinity];
+        max = [-Infinity, -Infinity];
+        for (var i = 0, len = points.length; i < len; i++) {
+            v2Min(min, min, points[i]);
+            v2Max(max, max, points[i]);
+        }
+        v2Min(min, min, constraint[0]);
+        v2Max(max, max, constraint[1]);
+    }
+    for (var i = 0, len = points.length; i < len; i++) {
+        var point = points[i];
+        if (isLoop) {
+            prevPoint = points[i ? i - 1 : len - 1];
+            nextPoint = points[(i + 1) % len];
+        }
+        else {
+            if (i === 0 || i === len - 1) {
+                cps.push(v2Clone(points[i]));
+                continue;
+            }
+            else {
+                prevPoint = points[i - 1];
+                nextPoint = points[i + 1];
+            }
+        }
+        v2Sub(v, nextPoint, prevPoint);
+        v2Scale(v, v, smooth);
+        var d0 = v2Distance(point, prevPoint);
+        var d1 = v2Distance(point, nextPoint);
+        var sum = d0 + d1;
+        if (sum !== 0) {
+            d0 /= sum;
+            d1 /= sum;
+        }
+        v2Scale(v1, v, -d0);
+        v2Scale(v2, v, d1);
+        var cp0 = v2Add([], point, v1);
+        var cp1 = v2Add([], point, v2);
+        if (constraint) {
+            v2Max(cp0, cp0, min);
+            v2Min(cp0, cp0, max);
+            v2Max(cp1, cp1, min);
+            v2Min(cp1, cp1, max);
+        }
+        cps.push(cp0);
+        cps.push(cp1);
+    }
+    if (isLoop) {
+        cps.push(cps.shift());
+    }
+    return cps;
+}