Function bucket_fill

std/src/console/drawing.rs:126–161

Fills the 4-connected region around `xy` via `rasops`.

(rasops: &mut R, xy: PixelsXY, fill_color: u8)

/// Fills the 4-connected region around `xy` via `rasops`.
pub fn bucket_fill<R>(rasops: &mut R, xy: PixelsXY, fill_color: u8) -> io::Result<()>
where
    R: RasterOps,
{
    let seed_color = match rasops.peek_pixel(xy)? {
        Some(color) => color,
        None => return Ok(()),
    };
    if seed_color == fill_color {
        return Ok(());
    }

    let mut pending = vec![xy];
    while let Some(xy) = pending.pop() {
        if rasops.peek_pixel(xy)? != Some(seed_color) {
            continue;
        }

        rasops.draw_pixel(xy)?;

        if xy.x > i16::MIN {
            pending.push(PixelsXY::new(xy.x - 1, xy.y));
        }
        if xy.x < i16::MAX {
            pending.push(PixelsXY::new(xy.x + 1, xy.y));
        }
        if xy.y > i16::MIN {
            pending.push(PixelsXY::new(xy.x, xy.y - 1));
        }
        if xy.y < i16::MAX {
            pending.push(PixelsXY::new(xy.x, xy.y + 1));
        }
    }

    Ok(())
}

/// Draws a circle via `rasops` with `center` and `radius`.
///