func initFpsCounter(screen *window.Screen) func() int {
const fpsBufferSize = 20
var fpsBuffer [fpsBufferSize]int
fpsCounter := 0
currentFps := 0
return func() int {
if fpsCounter > (fpsBufferSize - 1) {
fpsCounter = 0
fpsSum := 0
for _, val := range fpsBuffer {
fpsSum += val
}
currentFps = int(math.Ceil((float64(fpsSum) / float64(fpsBufferSize))))
if currentFps < 0 {
currentFps = 0
}
}
fpsBuffer[fpsCounter] = int(1 / screen.GetTimeSinceLastFrame())
fpsCounter++
return currentFps
}
}
func initCamera(screen *window.Screen) func() {
cam1 := camera.New(true)
cam1.SetOrtho(screen.Width, screen.Height, 200)
cam1.SetPosition2D(0, 0)
camx := 0.0
camy := 0.0
speed := 300.0
return func() {
if window.GetKeyState(window.KeyA) == window.KeyStatePressed {
camx -= screen.AmountPerSecond(speed)
}
if window.GetKeyState(window.KeyD) == window.KeyStatePressed {
camx += screen.AmountPerSecond(speed)
}
if window.GetKeyState(window.KeyW) == window.KeyStatePressed {
camy -= screen.AmountPerSecond(speed)
}
if window.GetKeyState(window.KeyS) == window.KeyStatePressed {
camy += screen.AmountPerSecond(speed)
}
cam1.SetPosition2D(float32(camx), float32(camy))
}
}