R.lookAt(WF.x, WF.y)
c = WB.distance(WF)
C.x = c[0]
C.y = c[1]
C.angle = c[2]
WF.setLastRotation()
WB.setLastRotation()
# display update
R.clearWindow()
C.render(R)
WF.render(R)
WB.render(R)
NG.render(R, WF.x - ground_display, WF.x + ground_display, 20)
R.displayText("x: " + str(int(WF.x)), 100, 32)
R.displayText("y: " + str(int(WF.y)), 100, 64)
R.displayText("vx: " + str(int(WF.vx)), 300, 32)
R.displayText("vy: " + str(int(WF.vy)), 300, 64)
R.displayText("ax*100: " + str(int(WF.ax * 100)), 500, 32)
R.displayText("ay*100: " + str(int(WF.ay * 100)), 500, 64)
R.updateWindow()
# quit at the end
