offsetting objects

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Eikon

Please help me out here, I'm still stuck on this. When the player reaches the center on the screen (the point where map scrolling begins), how can I have the bullet move backward as you move forward, and still keep the player centered?

Graphics 640, 480, 16, 2
SetBuffer BackBuffer()

A = 290: R = 0

PX = 20: PY = 260
While Not KeyDown(1)

Origin X, Y
Rect R * Cos(A), R * Sin(A), 4, 4
R = R + 3

Origin PX, PY
Rect 0, 0, 4, 4

If KeyDown(205) Then
	If PX < 320 Then PX = PX + 1 Else PX = 320
EndIf

If KeyDown(203) Then PX = PX - 1

If KeyHit(57) Then A = 290: R = 0: X = PX + OX: Y = PY

Flip:Cls
Wend:End

Use left/right to move and space to shoot.