Временный ограничитель рисования линии

Canvas.cpp

@@ -77,6 +77,23 @@ void Canvas::mousePressEvent(QMouseEvent* event)
 			*current_line->p2.x = scene.x();
 			*current_line->p2.y = scene.y();
 
+			// Временный ограничитель длины линии
+			double len = sqrt(pow(*current_line->p2.x - *current_line->p1.x, 2) + pow(*current_line->p2.y - *current_line->p1.y, 2));
+			if (len < 10) {
+				delete current_line;
+				current_line = nullptr;
+
+				points.pop_back();
+				points.pop_back();
+				params.pop_back();
+				params.pop_back();
+
+				mode = Mode::None;
+				QMessageBox::critical(this, "WHOOPS", "Sorry, your line is very short", QMessageBox::Ok);
+				update();
+				return;
+			}
+
 			params.push_back(current_line->p2.x);
 			params.push_back(current_line->p2.y);