Liquidfun links

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+# Debug Drawing
+
+You can implement the b2DebugDraw class to get detailed drawing of the physics
+world. Here are the available entities:
+
+* shape outlines
+
+* joint connectivity
+
+* broad-phase axis-aligned bounding boxes (AABBs)
+
+* center of mass
+
+<img align="center" src="image_24.png" alt="Debug drawing" height="306"
+width="431"><br/>
+This is the preferred method of drawing these physics entities, rather than
+accessing the data directly. The reason is that much of the necessary data is
+internal and subject to change.
+
+The testbed draws physics entities using the debug draw facility and the
+contact listener, so it serves as the primary example of how to implement
+debug drawing as well as how to draw contact points.
+
+
+*This content is licensed under
+[Creative Commons Attribution 4.0](http://creativecommons.org/licenses/by/4.0/legalcode).
+For details and restrictions, please see the
+[Content License](md__content_license.html).*