Moving line in canvas

Canvas.cpp

@@ -73,6 +73,18 @@ void Canvas::mousePressEvent(QMouseEvent* event)
 		if (p) {
 			draggedPoint = p;
 			dragOffset = scene - QPointF(*p->x, *p->y);
+			return;
+		}
+
+		Line* found = findAt(scene);
+		if (found) {
+			draggedLine = found;
+			QPointF lineCenter(
+				(*found->p1.x + *found->p2.x) / 2.0,
+				(*found->p1.y + *found->p2.y) / 2.0
+			);
+			dragOffset = scene - lineCenter;
+			return;
 		}
 	}
 
@@ -268,6 +280,36 @@ void Canvas::mouseMoveEvent(QMouseEvent* event)
 		*draggedPoint->y = pos.y();
 		update();
 	}
+
+	else if (draggedLine) {
+		QPointF newCenter = event->pos() - dragOffset;
+		QPointF oldCenter(
+			(*draggedLine->p1.x + *draggedLine->p2.x) / 2.0,
+			(*draggedLine->p1.y + *draggedLine->p2.y) / 2.0
+		);
+
+		// Смещение для перемещения
+		double dx = newCenter.x() - oldCenter.x();
+		double dy = newCenter.y() - oldCenter.y();
+
+		Point* linePoints[2] = { draggedLine->start_ref, draggedLine->end_ref };
+
+		for (int i = 0; i < 2; i++) {
+			Point* currentPoint = linePoints[i];
+
+			*currentPoint->x += dx;
+			*currentPoint->y += dy;
+
+			for (Point* pair : points) {
+				if (pair != currentPoint && areCoincident(currentPoint, pair)) {
+					*pair->x = *currentPoint->x;
+					*pair->y = *currentPoint->y;
+				}
+			}
+		}
+
+		update();
+	}
 }
 
 void Canvas::mouseReleaseEvent(QMouseEvent* event)
@@ -276,6 +318,11 @@ void Canvas::mouseReleaseEvent(QMouseEvent* event)
 		draggedPoint = nullptr;
 		update();
 	}
+
+	if (draggedLine) {
+		draggedLine = nullptr;
+		update();
+	}
 }
 
 void Canvas::paintEvent(QPaintEvent*)