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|
// Bits on the far end of the 32-bit global tile ID are used for tile flags
const FLIPPED_HORIZONTALLY_FLAG: u32 = 0x80000000;
const FLIPPED_VERTICALLY_FLAG: u32 = 0x40000000;
const FLIPPED_DIAGONALLY_FLAG: u32 = 0x20000000;
#[derive(Debug, Default, PartialEq)]
pub struct TileFlip {
// whether tile is flipped diagonally (should be the first operation)
pub diagonally: bool,
// whether tile is flipped horizontally (should be the second operation)
pub horizontally: bool,
// whether tile is flipped vertically (should be the third operation)
pub vertically: bool,
}
impl TileFlip {
fn new(diagonally: bool, horizontally: bool, vertically: bool) -> Self {
Self {
diagonally,
horizontally,
vertically,
}
}
}
#[derive(Debug)]
pub struct LayerTile(u32);
impl LayerTile {
/// Global Tile Id
pub fn gid(&self) -> u32 {
// Clear the flags
self.0 & !(FLIPPED_HORIZONTALLY_FLAG | FLIPPED_VERTICALLY_FLAG | FLIPPED_DIAGONALLY_FLAG)
}
pub fn get_flip(&self) -> TileFlip {
// Read out the flags
TileFlip {
diagonally: (self.0 & FLIPPED_DIAGONALLY_FLAG) > 0,
horizontally: (self.0 & FLIPPED_HORIZONTALLY_FLAG) > 0,
vertically: (self.0 & FLIPPED_VERTICALLY_FLAG) > 0,
}
}
}
#[cfg(test)]
mod test_layer_tile {
use crate::lowlevel::{layer_tile::*};
#[test]
fn test_get_flip() {
assert_eq!(LayerTile(13).get_flip(), TileFlip::default());
assert_eq!(
LayerTile(3451 | FLIPPED_DIAGONALLY_FLAG).get_flip(),
TileFlip::new(true, false, false)
);
}
#[test]
fn test_gid() {
assert_eq!(LayerTile(5).gid(), 5);
assert_eq!(
LayerTile(
52 | (FLIPPED_HORIZONTALLY_FLAG
| FLIPPED_VERTICALLY_FLAG
| FLIPPED_DIAGONALLY_FLAG)
)
.gid(),
52
);
assert_eq!(LayerTile(798 | (FLIPPED_DIAGONALLY_FLAG)).gid(), 798);
}
}
|
