3046d68da1
Generally, when transforming a difference between two points, `p1` and `p2`, with a matrix `m`, we would like the following property to hold: ``` m * (p1 - p2) == m * p1 - m * p2 ``` Unfortunately, it wasn't like this before, because matrices have a translation component, which is non-linear. In `m * p1 - m * p2`, the translations of `m * p1` and `m * p2` are the same and therefore cancel out each other. However, in `m * (p1 - p2)` the translation stays. In order to preserve this property, introduce a new `PointDelta` type which is not subject to translation when transformed by a matrix. For now, the following operations are supported: * `Point - Point -> PointDelta` * `Point + PointDelta -> Point` * `Point += PointDelta` * `Point - PointDelta -> Point` * `Point -= PointDelta` As a consequence, the expression `position + global_to_local_matrix * mouse_delta` in `update_drag()` now ignores translation, which fixes #817. |
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| .. | ||
| examples | ||
| src | ||
| tests/swfs | ||
| Cargo.toml | ||
| LICENSE-APACHE | ||
| LICENSE-MIT | ||
| README.md | ||
README.md
swf
A Rust library for reading and writing the Adobe Flash SWF file format.
# Cargo.toml
[dependencies]
swf = "0.2"
Reading
use std::io::BufReader;
use std::fs::File;
let file = File::open("file.swf").unwrap();
let reader = BufReader::new(file);
let swf_buf = swf::decompress_swf(reader).unwrap();
let swf = swf::parse_swf(&swf_buf).unwrap();
println!("The SWF has {} frame(s).", swf.header.num_frames());
println!("The SWF has {} tag(s).", swf.tags.len());
Try cargo run --example reading in this repository to run this example.
Writing
use swf::*;
let header = Header {
compression: Compression::Zlib,
version: 6,
stage_size: Rectangle {
x_min: Twips::from_pixels(0.0), x_max: Twips::from_pixels(400.0),
y_min: Twips::from_pixels(0.0), y_max: Twips::from_pixels(400.0)
},
frame_rate: Fixed8::from_f32(60.0),
num_frames: 1,
};
let tags = [
Tag::SetBackgroundColor(Color { r: 255, g: 0, b: 0, a: 255 }),
Tag::ShowFrame
];
let file = std::fs::File::create("file.swf").unwrap();
let writer = std::io::BufWriter::new(file);
swf::write_swf(&header, &tags, writer).unwrap();
Try cargo run --example writing in this repository to run this example.
License
Licensed under either of
- Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
- MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)
at your option.
Contribution
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.