From ff64443ba6c4ab0da8a4f48c8a2f36451af93bbc Mon Sep 17 00:00:00 2001
From: Mirek Fidler <mirek.fidler@gmail.com>
Date: Wed, 9 Jul 2025 13:35:36 +0200
Subject: [PATCH] RichEdit: Developing Diagram

---
 uppsrc/RichEdit/DiagramEditor.cpp           |  1 +
 uppsrc/RichEdit/DiagramEditor.h             | 13 ++++++-
 uppsrc/RichEdit/DiagramMouse.cpp            |  7 ++++
 uppsrc/RichEdit/{Ops.cpp => DiagramOps.cpp} | 41 +++++++++++++++++++++
 uppsrc/RichEdit/RichEdit.upp                |  2 +-
 uppsrc/RichText/Diagram.cpp                 |  2 +-
 6 files changed, 63 insertions(+), 3 deletions(-)
 rename uppsrc/RichEdit/{Ops.cpp => DiagramOps.cpp} (77%)

diff --git a/uppsrc/RichEdit/DiagramEditor.cpp b/uppsrc/RichEdit/DiagramEditor.cpp
index 7b5dbbe3d..aa079eae4 100644
--- a/uppsrc/RichEdit/DiagramEditor.cpp
+++ b/uppsrc/RichEdit/DiagramEditor.cpp
@@ -224,6 +224,7 @@ void DiagramEditor::Commit()
 		SetBar();
 		Sync();
 	}
+	conns.Clear();
 }
 
 String DiagramEditor::GetCurrent()
diff --git a/uppsrc/RichEdit/DiagramEditor.h b/uppsrc/RichEdit/DiagramEditor.h
index 8a16aa703..82533d680 100644
--- a/uppsrc/RichEdit/DiagramEditor.h
+++ b/uppsrc/RichEdit/DiagramEditor.h
@@ -60,8 +60,17 @@ private:
 	bool           grid = true; // snap to grid
 	bool           edit_text = false; // text editor is visible
 	int            zoom_percent = 100;
+	
+	struct Cn : Moveable<Cn> {
+		int mi; // item index
+		int ci; // connection index
+		int li; // line item index
+		int pi; // point index
+	};
+	
+	Vector<Cn>     conns; // connections, created at the drag start, updates line connections
 
-	BinUndoRedo       undoredo;
+	BinUndoRedo    undoredo;
 
 	int         tool = 0;
 	ToolBar     toolbar;
@@ -103,6 +112,8 @@ private:
 	Image  ShapeIcon(int i);
 	Image  CapIcon(int start, int end);
 	Image  DashIcon(int i);
+	void   PrepareConns();
+	void   UseConns();
 
 
 	void   FixPositions();
diff --git a/uppsrc/RichEdit/DiagramMouse.cpp b/uppsrc/RichEdit/DiagramMouse.cpp
index f0dbe074f..9eaedec79 100644
--- a/uppsrc/RichEdit/DiagramMouse.cpp
+++ b/uppsrc/RichEdit/DiagramMouse.cpp
@@ -98,6 +98,8 @@ void DiagramEditor::LeftDouble(Point p, dword keyflags)
 
 void DiagramEditor::LeftDown(Point p, dword keyflags)
 {
+	conns.Clear();
+
 	Map(p);
 
 	FinishText();
@@ -110,6 +112,7 @@ void DiagramEditor::LeftDown(Point p, dword keyflags)
 		if(h.x || h.y) {
 			draghandle = h;
 			Sync();
+			PrepareConns();
 			return;
 		}
 	}
@@ -127,6 +130,7 @@ void DiagramEditor::LeftDown(Point p, dword keyflags)
 			sdragfrom.SetCount(sel.GetCount());
 			for(int i = 0; i < sel.GetCount(); i++)
 				sdragfrom[i] = data.item[sel[i]];
+			PrepareConns();
 			draghandle = Null;
 		}
 	}
@@ -185,6 +189,7 @@ void DiagramEditor::MouseMove(Point p, dword keyflags)
 			Do(draghandle.y, m.pt[0].y, m.pt[1].y, p.y);
 		}
 		m.FixPosition();
+		UseConns();
 		Sync();
 		return;
 	}
@@ -192,6 +197,8 @@ void DiagramEditor::MouseMove(Point p, dword keyflags)
 
 void DiagramEditor::LeftUp(Point p, dword keyflags)
 {
+	conns.Clear();
+
 	Map(p);
 
 	Sync();
diff --git a/uppsrc/RichEdit/Ops.cpp b/uppsrc/RichEdit/DiagramOps.cpp
similarity index 77%
rename from uppsrc/RichEdit/Ops.cpp
rename to uppsrc/RichEdit/DiagramOps.cpp
index 7bc6ad542..75370258b 100644
--- a/uppsrc/RichEdit/Ops.cpp
+++ b/uppsrc/RichEdit/DiagramOps.cpp
@@ -105,6 +105,47 @@ void DiagramEditor::Align(bool horz, int align)
 	Commit();
 }
 
+void DiagramEditor::PrepareConns()
+{
+	conns.Clear();
+	VectorMap<Pointf, Vector<Tuple<int, int>>> map;
+	for(int pass = 0; pass < 2; pass++)
+		for(int i = 0; i < data.item.GetCount(); i++) {
+			const DiagramItem& m = data.item[i];
+			if(m.IsLine() == pass) {
+				Vector<Pointf> cp = m.GetConnections();
+				for(int j = 0; j < cp.GetCount(); j++)
+					map.GetAdd(cp[j]) << MakeTuple(i, j);
+			}
+		}
+	for(int i = 0; i < data.item.GetCount(); i++) {
+		const DiagramItem& m = data.item[i];
+		if(m.IsLine()) {
+			for(int j = 0; j < 2; j++) {
+				auto *q = map.FindPtr(m.pt[j]);
+				if(q) {
+					for(auto w : *q) {
+						Cn& c = conns.Add();
+						c.mi = w.a;
+						c.ci = w.b;
+						c.li = i;
+						c.pi = j;
+					}
+				}
+			}
+		}
+	}
+}
+
+void DiagramEditor::UseConns()
+{
+	for(const Cn& cn: conns)
+		if(sel.Find(cn.li) < 0)
+			data.item[cn.li].pt[cn.pi] = data.item[cn.mi].GetConnections()[cn.ci];
+}
+
+
+
 /* TODO remove
 
 struct SizeDlg : WithSizeLayout<TopWindow> {
diff --git a/uppsrc/RichEdit/RichEdit.upp b/uppsrc/RichEdit/RichEdit.upp
index 332d59373..980e53325 100644
--- a/uppsrc/RichEdit/RichEdit.upp
+++ b/uppsrc/RichEdit/RichEdit.upp
@@ -32,7 +32,7 @@ file
 	DiagramEditor.cpp,
 	DiagramMouse.cpp,
 	DiagramCursor.cpp,
-	Ops.cpp,
+	DiagramOps.cpp,
 	ColumnPopUp.cpp,
 	Bar.cpp,
 	Text.cpp,
diff --git a/uppsrc/RichText/Diagram.cpp b/uppsrc/RichText/Diagram.cpp
index aaa8667a2..ca2651544 100644
--- a/uppsrc/RichText/Diagram.cpp
+++ b/uppsrc/RichText/Diagram.cpp
@@ -282,7 +282,7 @@ void DiagramItem::Paint(Painter& w, dword style) const
 
 		if(style & EDITOR)
 			for(Pointf p : GetConnections())
-				w.Circle(p, 4).Stroke(1, 128 * SColorHighlight());
+				w.Circle(p, 4).Stroke(1, 190 * SColorHighlight());
 	}
 }