Geometry - Bezier Curve
TrueType fonts use composite Bézier curves composed of quadratic Bézier curves.
Bezier curves are defined by four points:
- two end points (or nodes) of the curve.
- two control points or handles,each paired with one of the end points.
The control points have the useful property that a line starting at one end of the curve and ending at the corresponding control point is tangent to the curve at the end point. This enables the smooth joining of multiple Bezier curves to form a path.