Added more overloads to add_lines.

Removed overloads for color3, use color4 instead.

viewer/glow-extras/viewer/canvas.hh

@@ -199,6 +199,26 @@ public:
         static_assert(D == 3, "only supports 3D currently");
         _add_line(tg::pos3(s.pos0), tg::pos3(s.pos1));
     }
+    template <int D, class T>
+    void add_lines(tg::pos<D, T> const& p0, tg::pos<D, T> const& p1)
+    {
+        add_lines(tg::segment(p0, p1));
+    }
+    template <int D, class T>
+    void add_lines(tg::pos<D, T> const& p0, tg::pos<D, T> const& p1, tg::color4 const& color)
+    {
+        add_lines(tg::segment(p0, p1), color);
+    }
+    template <int D, class T>
+    void add_lines(tg::pos<D, T> const& p, tg::vec<D, T> const& dir)
+    {
+        add_lines(tg::segment(p, p + dir));
+    }
+    template <int D, class T>
+    void add_lines(tg::pos<D, T> const& p, tg::vec<D, T> const& dir, tg::color4 const& color)
+    {
+        add_lines(tg::segment(p, p + dir), color);
+    }
     template <class T>
     void add_lines(T const& value)
     {
@@ -222,11 +242,6 @@ public:
         add_lines(value);
         _color = prev_c;
     }
-    template <class T>
-    void add_lines(T const& value, tg::color3 const& c)
-    {
-        add_lines(value, tg::color4(c, 1.f));
-    }
 
     // points
 public: