Minor fixes to OnScreenLineTracker

src/main/java/org/luwrain/interaction/javafx/OnScreenLineTracker.java

@@ -21,7 +21,7 @@
 
 import org.luwrain.core.*;
 
-public final class OnScreenLineTracker
+final class OnScreenLineTracker
 {
  final class Vertex
  {
@@ -75,7 +75,7 @@ void clear()
  vertices.clear();
  }
 
- public OnScreenLine[] getLines()
+ OnScreenLine[] getLines()
  {
  if (vertices.size() < 2)
  return new OnScreenLine[0];
@@ -98,8 +98,8 @@ private void addVertex(int pos)
  int i = 0;
  while(i < vertices.size() && vertices.get(i).pos < pos)
  i++;
-  if (i < vertices.size() && vertices.get(i).pos == pos)
-  return;
+ if (i < vertices.size() && vertices.get(i).pos == pos)
+  return;
  boolean followed = i > 0?vertices.get(i - 1).followed:false;
  if (i < vertices.size())
  vertices.add(i, new Vertex(pos, followed)); else
@@ -119,23 +119,19 @@ private void removeNeedless()
  }
  if (offset > 0)
  {
- final List<Vertex> t = vertices.subList(offset, vertices.size());
- vertices.clear();
- vertices.addAll(t);
+ vertices = new ArrayList(vertices.subList(offset, vertices.size()));
  }
  if (vertices.size() < 2)
  return;
-  //The doubling removing;
-  offset = 0;
+ // Removing the items which present twice
+ offset = 0;
  for(int i = 1;i < vertices.size();i++)
  {
  if (vertices.get(i - 1 - offset).followed == vertices.get(i).followed)
  offset++; else
  vertices.set(i - offset, vertices.get(i));
  }
- final List<Vertex> t = vertices.subList(0, vertices.size() - offset);
- vertices.clear();
- vertices.addAll(t);
+ vertices = new ArrayList(vertices.subList(0, vertices.size() - offset));
  if (!vertices.isEmpty() && (vertices.size() % 2) != 0)
  {
  Log.warning("interaction", "on screen lines tracking has odd vertex count:" + vertices.size() + ", clearing content");