geometric_shape_ball.html">   56</a></span>&#160;    <span class="keyword">class </span><a class="code" href="class_s_p_h_1_1_geometric_shape_ball.html">GeometricShapeBall</a> : <span class="keyword">public</span> <a class="code" href="class_s_p_h_1_1_shape.html">Shape</a></div><div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;    {</div><div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;        Vec2d center_;</div><div class="line"><a name="l00059"></a