godot/demos/2d/texscreen/lens.gd

extends BackBufferCopy

# member variables here, example:
# var a=2
# var b="textvar"
const MOTION_SPEED=150

var vsize;
var dir;

func _process(delta):
	var pos = get_pos() + dir * delta * MOTION_SPEED
	
	if (pos.x<0):
		dir.x=abs(dir.x)
	elif (pos.x>vsize.x):
		dir.x=-abs(dir.x)

	if (pos.y<0):
		dir.y=abs(dir.y)
	elif (pos.y>vsize.y):
		dir.y=-abs(dir.y)
		
	set_pos(pos)

func _ready():
	vsize = get_viewport_rect().size
	var pos = vsize * Vector2(randf(),randf());
	set_pos(pos);
	dir = Vector2(randf()*2.0-1,randf()*2.0-1).normalized()
	set_process(true)
	
	# Initialization here
	pass