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thick lines

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bendn 2023-09-26 12:20:35 +07:00
parent 611739ee6d
commit eed6423cba
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2 changed files with 48 additions and 3 deletions
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48
src/drawing/line.rs
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@ -131,7 +131,7 @@ impl Iterator for Bresenham {
}
impl<T: Deref<Target = [u8]> + DerefMut<Target = [u8]>, const CHANNELS: usize> Image<T, CHANNELS> {
/// Draw a line from point a to point b
/// Draw a line from point a to point b.
///
/// Points not in bounds will not be included.
///
@ -144,6 +144,52 @@ impl<T: Deref<Target = [u8]> + DerefMut<Target = [u8]>, const CHANNELS: usize> I
}
}
}
/// Draw a thick line from point a to point b.
/// Prefer [`Image::line`] when possible.
///
/// Points not in bounds will not be included.
///
/// Uses [`Image::points`].
/// ```
/// # use fimg::Image;
/// let mut i = Image::alloc(10, 10);
/// i.thick_line((2.0, 2.0), (8.0, 8.0), 2.0, [255]);
/// # assert_eq!(i.buffer(), b"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\x00\x00\x00\x00\x00\x00\x00\x00\xff\xff\xff\x00\x00\x00\x00\x00\x00\xff\xff\xff\xff\xff\x00\x00\x00\x00\x00\x00\xff\xff\xff\xff\xff\x00\x00\x00\x00\x00\x00\xff\xff\xff\xff\xff\x00\x00\x00\x00\x00\x00\xff\xff\xff\xff\xff\x00\x00\x00\x00\x00\x00\xff\xff\xff\xff\xff\x00\x00\x00\x00\x00\x00\xff\xff\xff\x00\x00\x00\x00\x00\x00\x00\x00\xff\x00\x00");
/// ```
pub fn thick_line(
&mut self,
(x1, y1): (f32, f32),
(x2, y2): (f32, f32),
stroke: f32,
color: [u8; CHANNELS],
) {
let (wx, wy) = {
let (x, y) = (y1 - y2, -(x1 - x2));
let l = (x * x + y * y).sqrt();
((x / l) * (stroke / 2.0), (y / l) * (stroke / 2.0))
};
macro_rules! p {
($x:expr,$y:expr) => {
#[allow(clippy::cast_possible_truncation)]
($x.round() as i32, $y.round() as i32)
};
}
// order:
// v x1 v x2
// [ ]
// ^ x3 ^ x4
self.points(
&[
p!(x1 - wx, y1 - wy), // x1
p!(x2 - wx, y2 - wy), // x2
p!(x2 + wx, y2 + wy), // x3
p!(x1 + wx, y1 + wy), // x4
p!(x1 - wx, y1 - wy), // x1 (close)
],
color,
);
}
}
#[cfg(test)]

3
src/drawing/poly.rs
View file

@ -8,6 +8,7 @@ use crate::Image;
impl<T: Deref<Target = [u8]> + DerefMut<Target = [u8]>, const CHANNELS: usize> Image<T, CHANNELS> {
/// Draws a filled polygon from a slice of points. Please close your poly. (first == last)
///
/// Borrowed from [imageproc](https://docs.rs/imageproc/latest/src/imageproc/drawing/polygon.rs.html#31), modified for less allocations.
/// ```
/// # use fimg::Image;
@ -48,8 +49,6 @@ impl<T: Deref<Target = [u8]> + DerefMut<Target = [u8]>, const CHANNELS: usize> I
}
}
intersections.sort_unstable();
// SAFETY: must.
unsafe { crate::assert_unchecked!(intersections.len() % 2 == 0) };
for &[x, y_] in intersections.array_chunks::<2>() {
let mut from = min(x, self.width() as i32);
let mut to = min(y_, self.width() as i32 - 1);