Node Editor: Visual tweaks to node links

Several visual tweaks to node links to make them overall fit in
better with the look of the node editor:

- Change the link thickness with the zoom level to a certain degree.
- Remove the fuzziness of the node link and its shadow/outline.
- The link outline color can now be made transparent.
- Add circles at the end of dragged links when connecting to sockets.
- Improve the banding of the color interpolation along the link.
- Adjust the spacing of dashes along straight node links.

Reviewed By: Pablo Vazquez, Hans Goudey

Differential Revision: http://developer.blender.org/D15036

1 files changed, 4 insertions, 0 deletions

diff --git a/source/blender/editors/space_node/node_intern.hh b/source/blender/editors/space_node/node_intern.hh
index 81c2bc0e962..b7fa6ffd807 100644
--- a/source/blender/editors/space_node/node_intern.hh
+++ b/source/blender/editors/space_node/node_intern.hh
@@ -214,6 +214,10 @@ void node_draw_link(const bContext &C,
                     const SpaceNode &snode,
                     const bNodeLink &link,
                     bool selected);
+void node_draw_link_dragged(const bContext &C,
+                            const View2D &v2d,
+                            const SpaceNode &snode,
+                            const bNodeLink &link);
 /**
  * Don't do shadows if th_col3 is -1.
  */