Task: Write Trails Drawing feature functions: calculate_smoothness

[cgmaiorano]

Description

New functions need to be written for calculating various features for trails. The calculate_smoothness function calculates the path smoothness based on curvature changes.

Tasks

• For all points in a segment, calculate consecutive vectors
• Normalize each vector
• Compute the angle between the 2 vectors
• smoothness = std(all angles in a segment)
  - returned in degrees

Freeform Notes

Calculated for each segment then average is taken of whole drawing.