diff --git a/src/components/fabric/QPolygon.js b/src/components/fabric/QPolygon.js
index a499032f..b92dd594 100644
--- a/src/components/fabric/QPolygon.js
+++ b/src/components/fabric/QPolygon.js
@@ -21,7 +21,12 @@ export default class QPolygon extends fabric.Group {
   qCells = []
   name
   shape = 0 // 점 6개일때의 shape 모양
+  helpPoints = []
+  helpLines = []
   constructor(points, options, canvas) {
+    if (points.length !== 4 || points.length !== 6) {
+      throw new Error('Points must be 4 or 6.')
+    }
     if (!options.fontSize) {
       throw new Error('Font size is required.')
     }
@@ -735,7 +740,17 @@ export default class QPolygon extends fabric.Group {
       },
       Math.abs(realLine1.length - realLine3.length),
     )
-
+    this.helpLines = [
+      realLine1,
+      realLine2,
+      realLine3,
+      realLine4,
+      realLine5,
+      realLine6,
+      ridge1,
+      ridge2,
+      ridgeEndLine,
+    ]
     this.addWithUpdate(realLine1)
     this.addWithUpdate(realLine2)
     this.addWithUpdate(realLine3)