道路模板：六岔口长度变长

src/graphic/Controls/AddCrossRoad.js

@@ -248,7 +248,7 @@ export default class AddCrossRoad {
 
   //六岔口
   buildSix(position) {
-    const len = 300;
+    const len = 500;
     const points = mathUtil.createSixPoint(position, len);
     let end = roadPointService.create(position);
     let start1 = roadPointService.create(points[0]);