Refactoring

А я отдыхать

Canvas.cpp

@@ -90,42 +90,41 @@ void Canvas::mousePressEvent(QMouseEvent* event)
 	}
 
 	else if (mode == Mode::Parallel) {
-		static Line* first = nullptr;
 		Line* found = findAt(scene);
 
 		if (!found) {
-			first = nullptr;
+			current_line = nullptr;
 			return;
 		}
 
-		if (!first) {
-			first = found;
+		if (!current_line) {
+			current_line = found;
 			return;
 		}
 
-		if (found == first){
-			first = nullptr;
+		if (found == current_line){
+			current_line = nullptr;
 			return;
 		}
 
-		if (!areAlreadyParallel(found, first)) {
-			sys.addConstraintParallel(*found, *first, constraints_count++);
-			parallelPairs.insert(makeOrderedPair(found, first));
-			first = nullptr;
+		if (!areAlreadyParallel(found, current_line)) {
+			sys.addConstraintParallel(*found, *current_line, constraints_count++);
+			parallelPairs.insert(makeOrderedPair(found, current_line));
+			current_line = nullptr;
 			mode = Mode::None;
 		}
 
 		else {
 			
 		#ifdef _DEBUG
-			qDebug() << "Line" << first << "and" << found << "are parallel. Abort!";
+			qDebug() << "Line" << current_line << "and" << found << "are parallel. Abort!";
 		#endif
 			QMessageBox::warning(this,
 				QString("Wrong"),
 				QString("Parallel lines can not be more parallel!"),
 				QMessageBox::Ok
 			);
-			first = nullptr;
+			current_line = nullptr;
 			return;
 		}