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//! Structures related to tile animations.
use crate::{
error::Result,
util::{XmlElement, get_attrs, parse_tag},
};
/// A structure describing a [frame] of a [TMX tile animation].
///
/// [frame]: https://doc.mapeditor.org/en/stable/reference/tmx-map-format/#tmx-frame
/// [TMX tile animation]: https://doc.mapeditor.org/en/stable/reference/tmx-map-format/#animation
#[derive(Debug, PartialEq, Clone, Copy)]
pub struct Frame {
/// The local ID of a tile within the parent tileset.
pub tile_id: u32,
/// How long (in milliseconds) this frame should be displayed before advancing to the next frame.
pub duration: u32,
}
impl Frame {
pub(crate) fn new<R: std::io::BufRead>(elem: XmlElement<'_, R>) -> Result<Frame> {
let (tile_id, duration) = get_attrs!(
for v in (elem.attrs) {
"tileid" => tile_id ?= v.parse::<u32>(),
"duration" => duration ?= v.parse::<u32>(),
}
(tile_id, duration)
);
parse_tag!(elem, {});
Ok(Frame { tile_id, duration })
}
}
pub(crate) fn parse_animation<R: std::io::BufRead>(elem: XmlElement<'_, R>) -> Result<Vec<Frame>> {
let mut animation = Vec::new();
parse_tag!(elem, {
"frame" => |elem| {
animation.push(Frame::new(elem)?);
Ok(())
},
});
Ok(animation)
}