fix initial direction

src/brush.h

@@ -160,6 +160,7 @@ public:
     float m_dir_dist = 0;
     float m_dir_step = 10;
     float m_dir_angle = 0;
+    float m_dir_init = 0;
     float m_curve = 0;
     float m_dist = 0;
     float m_step = 0;