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use std::fs::File;
use std::io::BufWriter;
use byteorder::{LittleEndian, WriteBytesExt};
use {Affine, Affine4, CHeader, Header, Point, Streamlines, Translation};
use affine::get_affine_and_translation;
pub struct Writer {
writer: BufWriter<File>,
pub affine4: Affine4,
affine: Affine,
translation: Translation,
real_n_count: i32
}
impl Writer {
pub fn new(path: &str, reference: Option<Header>) -> Writer {
let f = File::create(path).expect("Can't create new trk file.");
let mut writer = BufWriter::new(f);
let header = match reference {
Some(r) => r,
None => Header::default()
};
header.write(&mut writer);
let affine4 = header.affine4.try_inverse().unwrap();
let (affine, translation) = get_affine_and_translation(&affine4);
Writer { writer, affine4, affine, translation, real_n_count: 0 }
}
pub fn apply_affine(&mut self, affine: &Affine4) {
self.affine4 = self.affine4 * affine;
let (affine, translation) = get_affine_and_translation(&self.affine4);
self.affine = affine;
self.translation = translation;
}
pub fn write_all(&mut self, streamlines: &Streamlines) {
for streamline in streamlines {
self.write(streamline);
}
}
pub fn write(&mut self, streamline: &[Point]) {
self.writer.write_i32::<LittleEndian>(
streamline.len() as i32).unwrap();
for p in streamline {
self.write_point(*p);
}
self.real_n_count += 1;
}
pub fn write_from_iter<I>(&mut self, streamline: I, len: usize)
where I: IntoIterator<Item = Point>
{
self.writer.write_i32::<LittleEndian>(len as i32).unwrap();
for p in streamline {
self.write_point(p);
}
self.real_n_count += 1;
}
fn write_point(&mut self, p: Point) {
let p = p * self.affine + self.translation;
self.writer.write_f32::<LittleEndian>(p.x).unwrap();
self.writer.write_f32::<LittleEndian>(p.y).unwrap();
self.writer.write_f32::<LittleEndian>(p.z).unwrap();
}
}
impl Drop for Writer {
fn drop(&mut self) {
CHeader::seek_n_count_field(&mut self.writer);
self.writer.write_i32::<LittleEndian>(self.real_n_count).unwrap();
}
}