Function bevy_doryen::doryen::color_scale

source · 
pub fn color_scale(c: (u8, u8, u8, u8), coef: f32) -> (u8, u8, u8, u8)
Examples found in repository?
examples/demo/shared/character.rs (line 56)
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fn render_character(
    mut root_console: ResMut<RootConsole>,
    query: Query<(&Character, &Position)>,
    level_map: Res<LevelMap>,
    light_map: NonSend<LightMap>,
) {
    for (character, position) in &query {
        if !level_map
            .0
            .is_in_fov(position.x as usize, position.y as usize)
        {
            continue;
        }
        let (color, penumbra) = if character.light {
            (character.color, false)
        } else {
            let light = light_map
                .0
                .pixel(position.x as u32, position.y as u32)
                .unwrap();

            let penumbra = is_penumbra(light, 100);
            let mut color = color_mul(character.color, light);
            if penumbra {
                color = color_scale(color, LIGHT_COEF);
            }
            (color, penumbra)
        };
        root_console.ascii(
            position.character_x(),
            position.character_y(),
            if penumbra { '?' as u16 } else { character.ch },
        );
        root_console.fore(position.character_x(), position.character_y(), color);
    }
}
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examples/demo/light.rs (line 147)
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fn compute_lightmap(
    mut light_map: NonSendMut<LightMap>,
    size: Res<LevelSize>,
    query: Query<(&Light, &Position)>,
    level_map: Res<LevelMap>,
) {
    let light_map = &mut light_map.0;
    *light_map = Image::new_empty(size.width as u32 * 2, size.height as u32 * 2);
    let mut fov = FovRestrictive::new();
    for (light, light_position) in &query {
        let (px, py, intensity, radius) = if light.flicker {
            // alter light position, radius and intensity over time
            (
                light_position.x + (LIGHT_FLICKER_MOVE * (simplex(light.t) - 0.5)),
                light_position.y + (LIGHT_FLICKER_MOVE * (simplex(light.t + 2.0) - 0.5)),
                light.intensity + LIGHT_FLICKER_INTENSITY * (simplex(light.t + 4.0) - 0.5),
                light.radius * (1.0 + LIGHT_FLICKER_RADIUS * (simplex(light.t + 6.0) - 0.5)),
            )
        } else {
            (
                light_position.x,
                light_position.y,
                light.intensity,
                light.radius,
            )
        };

        let minx = ((px - radius).floor() as i32).max(0) as u32;
        let maxx = ((px + radius).ceil() as i32).min(light_map.width() as i32 - 1) as u32;
        let miny = ((py - radius).floor() as i32).max(0) as u32;
        let maxy = ((py + radius).ceil() as i32).min(light_map.height() as i32 - 1) as u32;
        let width = maxx - minx + 1;
        let height = maxy - miny + 1;
        let mut map = MapData::new(width as usize, height as usize);
        for y in miny..=maxy {
            for x in minx..=maxx {
                map.set_transparent(
                    (x - minx) as usize,
                    (y - miny) as usize,
                    level_map.0.is_transparent(x as usize, y as usize),
                );
            }
        }
        fov.compute_fov(
            &mut map,
            px as usize - minx as usize,
            py as usize - miny as usize,
            radius as usize,
            true,
        );
        let light_color = color_scale(light.color, intensity);
        let radius_squared = radius * radius;
        let radius_coef = 1.0 / (1.0 + radius_squared / 20.0);
        for y in miny..=maxy {
            for x in minx..=maxx {
                if map.is_in_fov((x - minx) as usize, (y - miny) as usize) {
                    let dx = x as f32 - px;
                    let dy = y as f32 - py;
                    // good looking lights.
                    let squared_dist = dx * dx + dy * dy;
                    let intensity_coef = 1.0 / (1.0 + squared_dist / 20.0);
                    let intensity_coef = intensity_coef - radius_coef;
                    let intensity_coef = intensity_coef / (1.0 - radius_coef);
                    if intensity_coef > 0.0 {
                        let light = color_blend(BLACK, light_color, intensity_coef);
                        let cur_light = light_map.pixel(x, y).unwrap();
                        light_map.put_pixel(x, y, color_add(light, cur_light));
                    }
                }
            }
        }
    }
}