drawing_antialiased_lines.md

Drawing Antialiased Lines

The line we drew in the previous tutorial looks like stairs due to the low image resolution. To solve this problem, we can use draw_antialiased_line_segment_mut. The function needs an extra parameter that describes how to fix the stairs problem. As suggested by the document, we use pixelops::interpolate for the parameter.

use imageproc::{drawing, image, pixelops};

fn main() {
    let mut buf = image::ImageBuffer::new(100, 100);
    
    drawing::draw_antialiased_line_segment_mut(
        &mut buf,
        (0, 10),
        (100, 90),
        image::Rgb::from([128u8, 255u8, 64u8]),
        pixelops::interpolate,
    );

    buf.save("antialiased_line.png").unwrap();
}

antialiased_line.png:

Note that the two end points of the line is of type (i32, i32) instead of (f32, f32), which is used by draw_line_segment_mut.

To draw on a copy of the image, we can use draw_antialiased_line_segment.

➡️ Next: Drawing Rectangles

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