1.3 2D Rays

8.12

package: euclid

A 2D ray is half of a line. A ray starts at an initial point and continues infinitely in a single direction.

struct
(struct ray (initial-point direction)
    #:transparent)
  initial-point : point?
  direction : angle?

A 2D ray structure starting at initial-point and pointed in direction.

procedure
(ray-between initial target) → ray?
initial : point?
target : point?

Returns the ray starting at initial and pointed towards target.

Examples:

> (ray-between (point 1 1) (point 5 5))
(ray (1,1) 45°)
> (ray-between (point 4 8) (point 4 0))
(ray (4,8) 270°)