From 9a02d1a654248e60b0bbf3bf9d0632918fdeb47c Mon Sep 17 00:00:00 2001
From: thomas_lucky13 <mkoul@mail.ru>
Date: Thu, 30 Jun 2022 00:42:41 +0400
Subject: [PATCH] new Line erase

---
 src/domain/UBGraphicsLineItem.cpp | 16 ++++++++--
 src/domain/UBGraphicsLineItem.h   | 20 +++++++------
 src/domain/UBGraphicsScene.cpp    | 50 +++++++++++++++++++++++++++----
 3 files changed, 70 insertions(+), 16 deletions(-)

diff --git a/src/domain/UBGraphicsLineItem.cpp b/src/domain/UBGraphicsLineItem.cpp
index e1d46cae..881bcb18 100644
--- a/src/domain/UBGraphicsLineItem.cpp
+++ b/src/domain/UBGraphicsLineItem.cpp
@@ -6,7 +6,6 @@
 
 #include "core/memcheck.h"
 
-#include <iostream>
 
 UBGraphicsLineItem::UBGraphicsLineItem (QGraphicsItem * parent)
     : QGraphicsLineItem(parent)
@@ -20,7 +19,6 @@ UBGraphicsLineItem::UBGraphicsLineItem (QGraphicsItem * parent)
     initialize();
 }
 
-
 UBGraphicsLineItem::UBGraphicsLineItem (const QLineF & line, QGraphicsItem * parent)
     : QGraphicsLineItem(line, parent)
     , mOriginalWidth(-1)
@@ -144,6 +142,20 @@ Qt::PenStyle UBGraphicsLineItem::style() const
     return QGraphicsLineItem::pen().style();
 }
 
+QList<QPointF> UBGraphicsLineItem::linePoints()
+{
+    QList<QPointF> points = QList<QPointF>();
+    qreal incr = 1/line().length();
+    if (incr<0) incr*=-1;
+    if (incr>0)
+    {
+       for (qreal t = 0; t <= 1; t+=incr)
+       {
+           points.push_back(line().pointAt(t));
+       }
+    }
+    return points;
+}
 
 UBItem* UBGraphicsLineItem::deepCopy() const
 {
diff --git a/src/domain/UBGraphicsLineItem.h b/src/domain/UBGraphicsLineItem.h
index f21c1039..535ef143 100644
--- a/src/domain/UBGraphicsLineItem.h
+++ b/src/domain/UBGraphicsLineItem.h
@@ -37,23 +37,23 @@ class UBGraphicsLineItem : public QGraphicsLineItem, public UBItem
 
         virtual UBGraphicsScene* scene();
 
-        inline void subtract(UBGraphicsLineItem *pi)
+        inline void subtract(UBGraphicsLineItem *li)
         {
-            //if (boundingRect().intersects(pi->boundingRect()))
-            //{
-                //QLineF subtractedLine = line().substracted(pi->line());
+            /*if (boundingRect().intersects(li->boundingRect()))
+            {
+                QLineF subtractedLine = line().substracted(li->line());
 
-                /*if (line() != subtractedLine)
+                if (line() != subtractedLine)
                 {
                     mIsNominalLine = false;
                     QGraphicsLineItem::setLine(subtractedLine);
-                }*/
-            //}
+                }
+            }*/
         }
 
-        inline void subtractIntersecting(UBGraphicsLineItem *pi)
+        inline void subtractIntersecting(UBGraphicsLineItem *li)
         {
-            /*QLineF subtractedLine = line();.substracted(pi->line())
+            /*QLineF subtractedLine = line().substracted(li->line());
             if (line() != subtractedLine)
             {
                 mIsNominalLine = false;
@@ -84,6 +84,8 @@ class UBGraphicsLineItem : public QGraphicsLineItem, public UBItem
 
         void setNominalLine(bool isNominalLine) { mIsNominalLine = isNominalLine; }
 
+        QList<QPointF> linePoints();
+
         QColor colorOnDarkBackground() const
         {
             return mColorOnDarkBackground;
diff --git a/src/domain/UBGraphicsScene.cpp b/src/domain/UBGraphicsScene.cpp
index 5ced9f53..ac3cbfdc 100644
--- a/src/domain/UBGraphicsScene.cpp
+++ b/src/domain/UBGraphicsScene.cpp
@@ -1047,13 +1047,15 @@ void UBGraphicsScene::eraseLineTo(const QPointF &pEndPoint, const qreal &pWidth)
     typedef QList<QPolygonF> POLYGONSLIST;
     QList<POLYGONSLIST> intersectedPolygons;
 
+    QList<UBGraphicsLineItem*> intersectedLineItems;
+
     #pragma omp parallel for
     for(int i=0; i<collidItems.size(); i++)
     {
         UBGraphicsPolygonItem *pi = qgraphicsitem_cast<UBGraphicsPolygonItem*>(collidItems[i]);
-        if(pi == NULL)
-            continue;
-
+        UBGraphicsLineItem *li = qgraphicsitem_cast<UBGraphicsLineItem*>(collidItems[i]);
+        if(pi != NULL)
+        {
         QPainterPath itemPainterPath;
         itemPainterPath.addPolygon(pi->sceneTransform().map(pi->polygon()));
 
@@ -1076,6 +1078,23 @@ void UBGraphicsScene::eraseLineTo(const QPointF &pEndPoint, const qreal &pWidth)
                intersectedPolygons << newPath.simplified().toFillPolygons(pi->sceneTransform().inverted());
             }
         }
+        } else if (li != NULL)
+        {
+            QPainterPath itemPainterPath;
+            QList<QPointF> linePoints = li->linePoints();
+            for (int i=0; i < linePoints.count(); ++i)
+            {
+                itemPainterPath.addEllipse(linePoints[i], 1, 1);
+            }
+            if (eraserPath.contains(itemPainterPath) || eraserPath.intersects(itemPainterPath))
+            {
+                #pragma omp critical
+                {
+                    // Compete remove item
+                    intersectedLineItems << li;
+                }
+            }
+        }
     }
 
     for(int i=0; i<intersectedItems.size(); i++)
@@ -1123,7 +1142,21 @@ void UBGraphicsScene::eraseLineTo(const QPointF &pEndPoint, const qreal &pWidth)
             intersectedPolygonItem->setTransform(t);
     }
 
-    if (!intersectedItems.empty())
+    for (int i=0; i<intersectedLineItems.size(); i++)
+    {
+        UBGraphicsLineItem *intersectedLineItem = intersectedLineItems[i];
+
+        mRemovedItems << intersectedLineItem;
+        QTransform t;
+        bool bApplyTransform = false;
+        removeItem(intersectedLineItem);
+        if (bApplyTransform)
+        {
+            intersectedLineItem ->setTransform(t);
+        }
+    }
+
+    if (!intersectedItems.empty() || !intersectedLineItems.empty())
         setModified(true);
 }
 
@@ -1552,7 +1585,7 @@ void UBGraphicsScene::clearContent(clearCase pCase)
                                                       ? qgraphicsitem_cast<UBGraphicsGroupContainerItem*>(item->parentItem())
                                                       : 0;
             UBGraphicsItemDelegate *curDelegate = UBGraphicsItem::Delegate(item);
-            if (!curDelegate) {
+            if (!curDelegate && item->type() != UBGraphicsLineItem::Type) {
                 continue;
             }
 
@@ -1560,6 +1593,12 @@ void UBGraphicsScene::clearContent(clearCase pCase)
             bool isStrokesGroup = item->type() == UBGraphicsStrokesGroup::Type;
 
             bool shouldDelete = false;
+            if(item->type()==UBGraphicsLineItem::Type)
+            {
+                removedItems << item;
+                this->removeItem(item);
+            } else
+            {
             switch (static_cast<int>(pCase)) {
             case clearAnnotations :
                 shouldDelete = isStrokesGroup;
@@ -1571,6 +1610,7 @@ void UBGraphicsScene::clearContent(clearCase pCase)
                 shouldDelete = !isGroup && !isBackgroundObject(item);
                 break;
             }
+            }
 
             if(shouldDelete) {
                 if (itemGroup) {