go-sdl-pong

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package base
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type Entity struct {
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	X, Y           int
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	Speed          float32
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	Xv             float32
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	Yv             float32
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	AlwaysOnScreen bool
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}
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func (e *Entity) Update() {
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	e.X += int(e.Xv * e.Speed)
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	e.Y += int(e.Yv * e.Speed)
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	if e.AlwaysOnScreen {
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		if e.Y > World.Screen.Height {
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			e.Y = World.Screen.Height
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		}
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		if e.Y < 0 {
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			e.Y = 0
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		}
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		if e.X > World.Screen.Width {
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			e.X = World.Screen.Width
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		}
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		if e.X < 0 {
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			e.X = 0
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		}
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	}
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}
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