From c283720a99886c847b0f9782015097ab81b7d7cf Mon Sep 17 00:00:00 2001
From: ParkSuMin <kamalovap@paksurion.ru>
Date: Mon, 15 Dec 2025 12:57:36 +0300
Subject: [PATCH] =?UTF-8?q?=D0=9F=D0=B5=D1=80=D0=B2=D0=BE=D0=B5=20=D0=BF?=
 =?UTF-8?q?=D1=80=D0=B8=D0=B1=D0=BB=D0=B8=D0=B6=D0=B5=D0=BD=D0=B8=D0=B5=20?=
 =?UTF-8?q?=D1=80=D0=B5=D1=88=D0=B5=D0=BD=D0=B8=D1=8F=20Issue=20#3?=
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---
 Canvas.cpp | 23 +++++++++++++++++++----
 Canvas.h   |  1 +
 2 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/Canvas.cpp b/Canvas.cpp
index d3e9b89..ea9487c 100644
--- a/Canvas.cpp
+++ b/Canvas.cpp
@@ -186,7 +186,7 @@ void Canvas::remove_constraints()
 
 void Canvas::mousePressEvent(QMouseEvent* event)
 {
-    QPointF scene = event->pos();
+    QPointF scene = screenToLogical(event->pos());
 
 #ifdef _DEBUG
     qDebug() << "Scene point in" << scene.x() << scene.y();
@@ -449,7 +449,7 @@ void Canvas::mouseMoveEvent(QMouseEvent* event)
 {
     // ====================== Перемещение точки ======================
     if (draggedPoint) {
-        QPointF pos = event->pos() - dragOffset;
+        QPointF pos = screenToLogical(event->pos()) - dragOffset;
 
         // Обновляем все связанные точки (совпадающие, горизонтальные, вертикальные)
         for (Point* pair : points) {
@@ -472,7 +472,7 @@ void Canvas::mouseMoveEvent(QMouseEvent* event)
 
     // ====================== Перемещение линии ======================
     else if (draggedLine) {
-        QPointF newCenter = event->pos() - dragOffset;
+        QPointF newCenter = screenToLogical(event->pos()) - dragOffset;
         QPointF oldCenter(
             (*draggedLine->p1.x + *draggedLine->p2.x) / 2.0,
             (*draggedLine->p1.y + *draggedLine->p2.y) / 2.0
@@ -529,6 +529,12 @@ void Canvas::paintEvent(QPaintEvent* event)
 
     QPainter p(this);
     p.setRenderHint(QPainter::Antialiasing, true);
+    p.translate(width() / 2.0, height() / 2.0);
+
+    p.setPen(Qt::red);
+    p.drawLine(-5, 0, 5, 0);
+    p.drawLine(0, -5, 0, 5);
+
 
     // ====================== Решение системы уравнений ======================
     if (!params.empty()) {
@@ -587,4 +593,13 @@ void Canvas::paintEvent(QPaintEvent* event)
         p.setPen(Qt::NoPen);
         p.drawEllipse(QPointF(*current_line->p1.x, *current_line->p1.y), 6, 6);
     }
-}
\ No newline at end of file
+}
+
+QPointF Canvas::screenToLogical(const QPointF& screenPos) const
+{
+    QPointF logical = screenPos;
+    logical.rx() -= width() / 2.0;
+    logical.ry() -= height() / 2.0;
+
+    return logical;
+}
diff --git a/Canvas.h b/Canvas.h
index d39d906..5e2de41 100644
--- a/Canvas.h
+++ b/Canvas.h
@@ -58,6 +58,7 @@ protected:
     void paintEvent(QPaintEvent* event) override;
 
 private:
+    QPointF screenToLogical(const QPointF& screenPos) const;
     // ====================== Методы поиска и выбора ======================
 
     /// Найти линию под указанной позицией