B4J Tutorial Bouncing a single ray inside a square

Sure you will figure it out. A position vector and a speed vector. When it hits a vertical wall we change the direction of the x-position vector and for a horizontal wall we change the direction of the y-position vector. Change direction => position x / y = position x / y * -1

 

[Johan Schoeman]

Bouncing 200 rays simultaneously inside a square from the center of the square at increasing angles of 360/numOfRays. Sure you will figure it out how to do more than 200 rays. Code DIM's 1000 and number of rays for the attached project set to 200.

    Dim leftTop, rightTop, leftBottom, rightBottom, centre, ray(1000), speed(1000), oldPos(1000) As PVector

numOfRays = 200                    'number of simultaneous rays to be drawn and bounced