Struct LayoutModel 

pub struct LayoutModel<'a> {
    pub ir: &'a TimelineIr,
    pub opts: RenderOptions,
    pub year_min: i64,
    pub year_max: i64,
    pub total_width: f64,
    pub total_height: f64,
    pub lanes_ordered: Vec<&'a Lane>,
    pub lane_y: HashMap<String, f64>,
    pub tick_step: i64,
    pub items: Vec<LaidItem<'a>>,
    pub lane_bands: Vec<LaneBandModel>,
    pub lane_colors: HashMap<String, String>,
}

Pre-computed layout: every coordinate needed by the renderer.

Fields

ir: &'a TimelineIr

opts: RenderOptions

year_min: i64

year_max: i64

total_width: f64

total_height: f64

lanes_ordered: Vec<&'a Lane>

lane_y: HashMap<String, f64>

tick_step: i64

items: Vec<LaidItem<'a>>

lane_bands: Vec<LaneBandModel>

Pre-computed lane background bands (index-ordered, same order as lanes_ordered).

lane_colors: HashMap<String, String>

Mapping from lane ID to resolved CSS color (palette-assigned).

Implementations

impl<'a> LayoutModel<'a>

pub fn compute(ir: &'a TimelineIr, opts: RenderOptions) -> Self

pub fn is_vertical(&self) -> bool

Returns true when the layout uses a vertical (top-to-bottom time axis) orientation.

pub fn year_to_primary(&self, year: i64) -> f64

Convert a year to the primary axis coordinate.

• Horizontal: returns the X coordinate.
• Vertical: returns the Y coordinate.

pub fn year_to_x(&self, year: i64) -> f64

pub fn month_ticks(&self) -> Vec<(i64, u8)>

Month minor-tick positions for unit=month timelines.

Returns (year, month) pairs where month ∈ 2..=12 (month=1 overlaps the year tick). Empty when unit != "month" or when the scale is too small to show sub-year ticks.

pub fn frac_year_to_x(&self, year: i64, month: u8) -> f64

X coordinate for a (year, month) fractional position.

pub fn day_frac_to_x(&self, year: i64, month: u8, day: u8) -> f64

X coordinate for a (year, month, day) fractional position.

pub fn day_ticks(&self) -> Vec<(i64, u8, u8)>

Day-level minor-tick positions for unit=day timelines.

Returns (year, month, day) triples covering the visible range. 過密回避のため、1日あたりの pixel-per-day が小さい場合は step を 7/14/30 日に切り替える。 unit != "day" または 1 日あたりのピクセルが小さすぎる場合は空配列を返す。

pub fn ticks(&self) -> Vec<i64>

Tick positions (year values) within [year_min, year_max], inclusive of year_min if aligned.

pub fn grid_positions(&self) -> Vec<f64>

Grid line positions for the current GridStyle.

Returns fractional year values (f64) covering [year_min, year_max].

• GridStyle::None → empty (no grid lines drawn)
• GridStyle::Decade → one position per 10 years
• GridStyle::Year → one position per year
• GridStyle::Month → one position per 1/12 year (12 per year)

Positions that coincide with existing axis ticks are included; the SVG renderer draws grid lines behind tick marks so duplicates are invisible.