ludic/docs/language/builtins/fn-flr.md
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Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-08-29 17:53:22 +03:00

1.1 KiB

id name category kind tokens sig tip order
fn-flr flr builtins builtin flr flr(x) -> int Floor a fixed-point value down to the nearest integer. 50

Converts a fixed (Q16.16) value back to an int by discarding the fractional part, rounding toward negative infinity. It is the counterpart to fx: you accumulate motion in fixed-point for sub-pixel smoothness, then flr the result to get the whole-pixel column or row to draw at. Because it floors rather than rounds, flr(fx(3) / fx(2)) is 1, not 2. Use it wherever a fixed value must become an integer coordinate, count, or index.

Parameters:

  • x — the fixed-point value to floor
program FixedToPixels {
  const TILE_SIZE: int = 16

  handler DrawWorld phase Render {
    Screen.clear(Color.MidnightBlue)
    let smooth_column = fx(5) + fx(1) / fx(2)
    let pixel_x = flr(smooth_column) * TILE_SIZE
    Screen.fill_rectangle(x: pixel_x, y: 32, width: TILE_SIZE, height: TILE_SIZE, color: Color.LimeGreen)
    Screen.show()
  }
}