diff --git a/designer-form/src/main/java/com/fr/design/mainframe/AbstractFormParallelLine.java b/designer-form/src/main/java/com/fr/design/mainframe/AbstractFormParallelLine.java
index c815c7aff..0881742ef 100644
--- a/designer-form/src/main/java/com/fr/design/mainframe/AbstractFormParallelLine.java
+++ b/designer-form/src/main/java/com/fr/design/mainframe/AbstractFormParallelLine.java
@@ -17,15 +17,15 @@ public abstract class AbstractFormParallelLine {
         return (startPosition + endPosition) / 2;
     }
 
-    abstract public Point getCenterPerpendicularLineStartPoint();
+    abstract public Point getStartPointOnVerticalCenterLine();
 
-    abstract public Point getCenterPerpendicularLineEndPoint(int parallelValue);
+    abstract public Point getEndPointOnVerticalCenterLine(int parallelValue);
 
-    public boolean isBeforeParallelLine(AbstractFormParallelLine parallelLine) {
+    public boolean isVerticalCenterLineBeforeTheParallelLine(AbstractFormParallelLine parallelLine) {
         return this.getCenterPosition() < parallelLine.getStartPosition();
     }
 
-    public boolean isBehindParallelLine(AbstractFormParallelLine parallelLine) {
+    public boolean isVerticalCenterLineBehindTheParallelLine(AbstractFormParallelLine parallelLine) {
         return this.getCenterPosition() > parallelLine.getEndPosition();
     }
 
diff --git a/designer-form/src/main/java/com/fr/design/mainframe/FormHorizontalParallelLine.java b/designer-form/src/main/java/com/fr/design/mainframe/FormHorizontalParallelLine.java
index 6e0abeb02..da2671d32 100644
--- a/designer-form/src/main/java/com/fr/design/mainframe/FormHorizontalParallelLine.java
+++ b/designer-form/src/main/java/com/fr/design/mainframe/FormHorizontalParallelLine.java
@@ -8,14 +8,14 @@ public class FormHorizontalParallelLine extends AbstractFormParallelLine {
     }
 
     @Override
-    public Point getCenterPerpendicularLineStartPoint() {
+    public Point getStartPointOnVerticalCenterLine() {
         Point point = new Point();
         point.setLocation(getCenterPosition(), parallelValue);
         return point;
     }
 
     @Override
-    public Point getCenterPerpendicularLineEndPoint(int parallelValue) {
+    public Point getEndPointOnVerticalCenterLine(int parallelValue) {
         Point point = new Point();
         point.setLocation(getCenterPosition(), parallelValue);
         return point;
@@ -24,9 +24,9 @@ public class FormHorizontalParallelLine extends AbstractFormParallelLine {
     @Override
     public Point getExtendedLineStartPoint(AbstractFormParallelLine parallelLine) {
         Point point = new Point();
-        if (isBeforeParallelLine(parallelLine)) {
+        if (isVerticalCenterLineBeforeTheParallelLine(parallelLine)) {
             point.setLocation(parallelLine.getStartPosition(), parallelLine.getParallelValue());
-        } else if (isBehindParallelLine(parallelLine)) {
+        } else if (isVerticalCenterLineBehindTheParallelLine(parallelLine)) {
             point.setLocation(parallelLine.getEndPosition(), parallelLine.getParallelValue());
         }
         return point;
@@ -35,9 +35,9 @@ public class FormHorizontalParallelLine extends AbstractFormParallelLine {
     @Override
     public Point getExtendedLineEndPoint(AbstractFormParallelLine parallelLine) {
         Point point = new Point();
-        if (isBeforeParallelLine(parallelLine)) {
+        if (isVerticalCenterLineBeforeTheParallelLine(parallelLine)) {
             point.setLocation(getStartPosition(), parallelLine.getParallelValue());
-        } else if (isBehindParallelLine(parallelLine)) {
+        } else if (isVerticalCenterLineBehindTheParallelLine(parallelLine)) {
             point.setLocation(getEndPosition(), parallelLine.getParallelValue());
         }
         return point;
diff --git a/designer-form/src/main/java/com/fr/design/mainframe/FormSpacingLineDrawer.java b/designer-form/src/main/java/com/fr/design/mainframe/FormSpacingLineDrawer.java
index df31cf687..0b92efc16 100644
--- a/designer-form/src/main/java/com/fr/design/mainframe/FormSpacingLineDrawer.java
+++ b/designer-form/src/main/java/com/fr/design/mainframe/FormSpacingLineDrawer.java
@@ -73,10 +73,10 @@ public class FormSpacingLineDrawer {
             return;
         }
 
-        int startX = (int) nearestSides[0].getCenterPerpendicularLineStartPoint().getX();
-        int startY = (int) nearestSides[0].getCenterPerpendicularLineStartPoint().getY();
-        int endX = (int) nearestSides[0].getCenterPerpendicularLineEndPoint(nearestSides[1].getParallelValue()).getX();
-        int endY = (int) nearestSides[0].getCenterPerpendicularLineEndPoint(nearestSides[1].getParallelValue()).getY();
+        int startX = (int) nearestSides[0].getStartPointOnVerticalCenterLine().getX();
+        int startY = (int) nearestSides[0].getStartPointOnVerticalCenterLine().getY();
+        int endX = (int) nearestSides[0].getEndPointOnVerticalCenterLine(nearestSides[1].getParallelValue()).getX();
+        int endY = (int) nearestSides[0].getEndPointOnVerticalCenterLine(nearestSides[1].getParallelValue()).getY();
 
         drawSpacingLine(g, startX, startY, endX, endY);
         drawSpacingText(g, String.valueOf(gap), (startX + endX) / 2, (startY + endY) / 2);
@@ -140,7 +140,7 @@ public class FormSpacingLineDrawer {
     }
 
     private boolean isNeedExtendedLine(AbstractFormParallelLine[] nearestSides) {
-        return nearestSides[0].isBeforeParallelLine(nearestSides[1]) || nearestSides[0].isBehindParallelLine(nearestSides[1]);
+        return nearestSides[0].isVerticalCenterLineBeforeTheParallelLine(nearestSides[1]) || nearestSides[0].isVerticalCenterLineBehindTheParallelLine(nearestSides[1]);
     }
 
     private boolean isSelectedRootPane() {
diff --git a/designer-form/src/main/java/com/fr/design/mainframe/FormVerticalParallelLine.java b/designer-form/src/main/java/com/fr/design/mainframe/FormVerticalParallelLine.java
index 0d02f122b..e99cdd207 100644
--- a/designer-form/src/main/java/com/fr/design/mainframe/FormVerticalParallelLine.java
+++ b/designer-form/src/main/java/com/fr/design/mainframe/FormVerticalParallelLine.java
@@ -8,14 +8,14 @@ public class FormVerticalParallelLine extends AbstractFormParallelLine {
     }
 
     @Override
-    public Point getCenterPerpendicularLineStartPoint() {
+    public Point getStartPointOnVerticalCenterLine() {
         Point point = new Point();
         point.setLocation(parallelValue, getCenterPosition());
         return point;
     }
 
     @Override
-    public Point getCenterPerpendicularLineEndPoint(int parallelValue) {
+    public Point getEndPointOnVerticalCenterLine(int parallelValue) {
         Point point = new Point();
         point.setLocation(parallelValue, getCenterPosition());
         return point;
@@ -24,9 +24,9 @@ public class FormVerticalParallelLine extends AbstractFormParallelLine {
     @Override
     public Point getExtendedLineStartPoint(AbstractFormParallelLine parallelLine) {
         Point point = new Point();
-        if (isBeforeParallelLine(parallelLine)) {
+        if (isVerticalCenterLineBeforeTheParallelLine(parallelLine)) {
             point.setLocation(parallelLine.getParallelValue(), parallelLine.getStartPosition());
-        } else if (isBehindParallelLine(parallelLine)) {
+        } else if (isVerticalCenterLineBehindTheParallelLine(parallelLine)) {
             point.setLocation(parallelLine.getParallelValue(), parallelLine.getEndPosition());
         }
         return point;
@@ -35,9 +35,9 @@ public class FormVerticalParallelLine extends AbstractFormParallelLine {
     @Override
     public Point getExtendedLineEndPoint(AbstractFormParallelLine parallelLine) {
         Point point = new Point();
-        if (isBeforeParallelLine(parallelLine)) {
+        if (isVerticalCenterLineBeforeTheParallelLine(parallelLine)) {
             point.setLocation(parallelLine.getParallelValue(), getStartPosition());
-        } else if (isBehindParallelLine(parallelLine)) {
+        } else if (isVerticalCenterLineBehindTheParallelLine(parallelLine)) {
             point.setLocation(parallelLine.getParallelValue(), getEndPosition());
         }
         return point;