Initial revision

src/routing-lines.h

@@ -0,0 +1,22 @@
+// SPDX-FileCopyrightText: 2022 Geoffrey D. Bennett <g@b4.vu>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include <gtk/gtk.h>
+
+void draw_routing_lines(
+  GtkDrawingArea *drawing_area,
+  cairo_t        *cr,
+  int             width,
+  int             height,
+  void           *user_data
+);
+
+void draw_drag_line(
+  GtkDrawingArea *drawing_area,
+  cairo_t        *cr,
+  int             width,
+  int             height,
+  void           *user_data
+);