func drawIntroMask(screen *image.Image, frame uint64, fps uint) {
var maxFrame uint64 = uint64(maskDuration * fps)
if frame < maxFrame {
black := mygameengine.COLOR_BLACK
black.A = uint8(math.Max(0, 255-float64(frame)*(255/float64(maxFrame))))
screen.DrawRectangle(0, 0, 640, 480, black)
}
}
func drawGameBackground(screen *image.Image) {
screen.DrawRectangle(0, 0, 640, 480, mygameengine.COLOR_BLACK)
}
func drawGameFlash(screen *image.Image, flash int) {
white := mygameengine.COLOR_WHITE
white.A = uint8(25 * flash)
screen.DrawRectangle(0, 0, 640, 480, white)
}