[KoST]

[edit]

--------------<Aim>-------------- plane 1
                ^
                |
                | (me_aim vector)
                |
                |
--------------<Me>-------------- plane 2

you can imagine this like two planes which have me_aim as normal vector. this stock only returns positive values if victim is between them. no need to check for visibility i guess..

stock get_distance_to_line(Float:pos_start[3], Float:pos_end[3], Float:pos_object[3]) 
{ 
    new Float:vec_start_end[3], Float:vec_start_object[3], Float:vec_end_object[3], Float:vec_end_start[3]
    xs_vec_sub(pos_end, pos_start, vec_start_end) // vector from start to end
    xs_vec_sub(pos_object, pos_start, vec_start_object) // vector from end to object
    xs_vec_sub(pos_start, pos_end, vec_end_start) // vector from end to start
    xs_vec_sub(pos_end, pos_object, vec_end_object) // vector object to end
    
    new Float:len_start_object = getVecLen(vec_start_object)
    new Float:angle_start = floatacos(xs_vec_dot(vec_start_end, vec_start_object) / (getVecLen(vec_start_end) * len_start_object), degrees) 
    new Float:angle_end = floatacos(xs_vec_dot(vec_end_start, vec_end_object) / (getVecLen(vec_end_start) * getVecLen(vec_end_object)), degrees) 

    if(angle_start <= 90.0 && angle_end <= 90.0)
        return floatround(len_start_object * floatsin(angle_start, degrees))
    return -1 
}

it checks if alpha and beta are <=90 degrees if c is victim. if one of them is larger then we are outside the planes.