From 199cfd4d326649f2677067b46fb503199c29db7b Mon Sep 17 00:00:00 2001
From: Kanguk Lee <cashmonsterapp@gmail.com>
Date: Thu, 20 Apr 2017 09:09:30 +0900
Subject: [PATCH 1/2] Update PolygonView.java

added invalidate method.
It will be more natural by preventing the square twist.
---
 .../java/com/scanlibrary/PolygonView.java     | 52 +++++++++++++++++++
 1 file changed, 52 insertions(+)

diff --git a/ScanDemoExample/scanlibrary/src/main/java/com/scanlibrary/PolygonView.java b/ScanDemoExample/scanlibrary/src/main/java/com/scanlibrary/PolygonView.java
index 362e4c76..3efd940b 100644
--- a/ScanDemoExample/scanlibrary/src/main/java/com/scanlibrary/PolygonView.java
+++ b/ScanDemoExample/scanlibrary/src/main/java/com/scanlibrary/PolygonView.java
@@ -292,5 +292,57 @@ public boolean onTouch(View v, MotionEvent event) {
 
     }
 
+    public void invalidate() {
 
+        if (pointer1.getX() > pointer4.getX() && pointer1.getY() > pointer4.getY()) {
+            ImageView tempImageView = pointer4;
+            pointer4 = pointer1;
+            pointer1 = tempImageView;
+        }
+
+        if (pointer2.getY() > pointer3.getY() && pointer2.getX() < pointer3.getX()) {
+            ImageView tempImageView = pointer3;
+            pointer3 = pointer2;
+            pointer2 = tempImageView;
+        }
+
+        if (pointer1.getX() > pointer4.getX()) {
+            ImageView tempImageView = pointer4;
+            pointer4 = pointer3;
+            pointer3 = tempImageView;
+        }
+
+        if (pointer1.getY() > pointer3.getY()) {
+            ImageView tempImageView = pointer3;
+            pointer3 = pointer1;
+            pointer1 = tempImageView;
+        }
+
+        if (pointer2.getY() > pointer4.getY()) {
+            ImageView tempImageView = pointer4;
+            pointer4 = pointer2;
+            pointer2 = tempImageView;
+        }
+
+
+        if (pointer1.getX() > pointer2.getX()) {
+            ImageView tempImageView = pointer2;
+            pointer2 = pointer1;
+            pointer1 = tempImageView;
+        }
+
+        if (pointer3.getX() > pointer4.getX()) {
+            ImageView tempImageView = pointer4;
+            pointer4 = pointer3;
+            pointer3 = tempImageView;
+        }
+
+
+        midPointer13.setOnTouchListener(new MidPointTouchListenerImpl(pointer1, pointer3));
+        midPointer12.setOnTouchListener(new MidPointTouchListenerImpl(pointer1, pointer2));
+        midPointer34.setOnTouchListener(new MidPointTouchListenerImpl(pointer3, pointer4));
+        midPointer24.setOnTouchListener(new MidPointTouchListenerImpl(pointer2, pointer4));
+
+        super.invalidate();
+    }
 }

From 83087a7edbf4d1f51719fe827ad3ca9422b7e416 Mon Sep 17 00:00:00 2001
From: Kanguk Lee <cashmonsterapp@gmail.com>
Date: Thu, 20 Apr 2017 13:54:47 +0900
Subject: [PATCH 2/2] Update PolygonView.java

Added superInvalidate() method
That's just the original invalidate method.

Used to move the midpointer.
---
 .../src/main/java/com/scanlibrary/PolygonView.java     | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/ScanDemoExample/scanlibrary/src/main/java/com/scanlibrary/PolygonView.java b/ScanDemoExample/scanlibrary/src/main/java/com/scanlibrary/PolygonView.java
index 3efd940b..4f61bf2d 100644
--- a/ScanDemoExample/scanlibrary/src/main/java/com/scanlibrary/PolygonView.java
+++ b/ScanDemoExample/scanlibrary/src/main/java/com/scanlibrary/PolygonView.java
@@ -238,7 +238,11 @@ public boolean onTouch(View v, MotionEvent event) {
                 default:
                     break;
             }
-            polygonView.invalidate();
+            if (eid == MotionEvent.ACTION_MOVE) {
+                polygonView.superInvalidate();
+            }else {
+                polygonView.invalidate();
+            }
             return true;
         }
     }
@@ -345,4 +349,8 @@ public void invalidate() {
 
         super.invalidate();
     }
+    
+    public void superInvalidate() {
+        super.invalidate();
+    }
 }