Struct gemini_engine::elements::geometry::Line

pub struct Line {
    pub pos0: Vec2D,
    pub pos1: Vec2D,
    pub fill_char: ColChar,
}

The Line takes two Vec2Ds and returns a line between those vertices when blit to a View

Fields

pos0: Vec2D

The start positon of the line

pos1: Vec2D

The end position of the line

fill_char: ColChar

The ColChar used to colour the line

Implementations

impl Line

pub const fn new(pos0: Vec2D, pos1: Vec2D, fill_char: ColChar) -> Self

Create a new line with a start and end point and a ColChar

Examples found in repository

examples/complex-scene.rs (line 19)

fn main() {
    let mut view = View::new(60, 10, BACKGROUND_CHAR);
    view.coord_numbers_in_render = true;

    let mut pixel = Pixel::new(Vec2D::from((5u8, 9u8)), FILL_CHAR);

    let mut line = Line::new(Vec2D::new(2, 8), Vec2D::new(28, 7), FILL_CHAR);
    let mut line1_direction = -1;

    let rect = Rect::new(
        Vec2D { x: 11, y: 1 },
        Vec2D { x: 9, y: 3 },
        ColChar::SOLID.with_rgb(200, 30, 0),
    );

    let test_image = r"
  ______
 /|_||_\`.__
(   _    _ _\
=`-(_)--(_)-'   ";
    let mut sprite = Sprite::new(
        Vec2D::new(30, 1),
        test_image,
        Modifier::from_rgb(20, 200, 0),
    );

    let mut blit_elapsed = Duration::default();
    let mut render_elapsed = Duration::default();
    fps_gameloop!(
        {
            pixel.pos.x += 2;
            // loop the position back to the other side. This can be done with `Wrapping::Wrap` but it won't change the element's actual position, so the pixel position being printed would continue to increase without looping
            pixel.pos %= view.size();

            line.pos1.y += line1_direction;
            line.pos0.y = 10 - line.pos1.y;
            if line.pos1.y > 7 {
                line1_direction = -1;
            } else if line.pos1.y < 3 {
                line1_direction = 1;
            }

            sprite.pos.x += 1;
        },
        {
            view.clear();

            let now = Instant::now();
            view.blit(&pixel, Wrapping::Panic);
            view.blit(&line, Wrapping::Panic);
            view.blit(&rect, Wrapping::Panic);
            view.blit(&sprite, Wrapping::Wrap);
            blit_elapsed = now.elapsed();

            let now = Instant::now();
            let _ = view.display_render();
            render_elapsed = now.elapsed();
        },
        FPS,
        |total_elapsed: Duration, _frame_skip| {
            println!(
                "Blitting: {:.2?} microseconds | Rendering: {:.2?} microseconds| Total: {:.2?}",
                blit_elapsed.as_micros(),
                render_elapsed.as_micros(),
                total_elapsed.as_micros()
            );
            println!("Pixel position: {}", pixel.pos);
        }
    );
}

pub fn draw(pos0: Vec2D, pos1: Vec2D) -> Vec<Vec2D>

Draw a line using Bresenham’s line algorithm. Returns a list of the pixels to print to

Trait Implementations

impl ViewElement for Line

fn active_pixels(&self) -> Vec<Pixel>

Return a vector of the element’s Pixels - A ColChar. If your whole object is a solid colour, consider using utils::points_to_pixels() which will add the same ColChar to every point and can then be used as this function’s output

fn active_points(&self) -> Vec<Vec2D>

Return the positions the ViewElement occupies, essentially active_pixels() without the ColChars. This has a default setting that extracts the Vec2Ds from active_pixels but you can set it to something else to make it faster