add pretti littl marker debug purpos us marker anchor comput target posit collis detect affect largish box mark posit fig edg fe pct delta angl offset color color set enabl debug fig fig fig circl color color red anchor posit fe add path item path item placement fe pct delta angl fig rect color color red set fill fe add path item path item placement fe pct delta angl offset fig circl color color blue fe add path item path item placement fe pct delta angl offset 