Version Aug 27th
Version Aug 27th

1. The problem that when scroll the bar, some anchors perform slowly to
reach its column.
2. The position and angle of arrows can be represented at the right
place.
I calculate the position of arrow by using the function of bezier curve.

The next step is to fix the label overlap problem.

usc-isi-i2/karma-model-layout,usc-isi-i2/karma-model-layout