add checkbox to enable top to bottom layout

ros-visualization / rqt_graph

http://wiki.ros.org/rqt_graph

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add checkbox to enable top to bottom layout #29

Open lennonwoo opened 5 years ago

lennonwoo commented 5 years ago

As described in #28 , this PR add a checkbox to enable top to bottom layout. But after enable TB layout, the dot graph is still too wide, and the LR layout is more neat.