The "angle_reflect" Function

Syntax

angle_reflect(deg, mirror);

Argument	Type	Description
deg	real	The angle to reflect, in degrees
mirror	real	The mirror angle to reflect from, in degrees

Description

Returns an angle in degrees reflected from a mirror "line" with the given angle in degrees. A mirror angle of 0 degrees is considered horizontal.

tip

See the included interactive demo for a visual example of this function!

Example

var angle_in = point_direction(mouse_x, mouse_y, mirror_x, mirror_y);

var angle_out = angle_reflect(angle_in, mirror_rot);

var dist = point_distance(mouse_x, mouse_y, mirror_x, mirror_y);

// Draw mirror

draw_line(

mirror_x - rot_dist_x(64, mirror_rot), mirror_y - rot_dist_y(64, mirror_rot),

mirror_x + rot_dist_x(64, mirror_rot), mirror_y + rot_dist_y(64, mirror_rot)

);

// Draw angle in

draw_arrow(mouse_x, mouse_y, mirror_x, mirror_y, 16);

// Draw angle out

draw_arrow(

mirror_x, mirror_y,

mirror_x + rot_dist_x(dist, angle_out), mirror_y + rot_dist_y(dist, angle_out),

16

);