egui-charts 0.2.0

//! Price and time axis rendering

use crate::styles::typography;
use crate::tokens::DESIGN_TOKENS;
use egui::{Color32, Painter, Pos2, Rect, Stroke, Vec2};

/// Renders the last price line and label
pub fn render_last_price_line(
    painter: &Painter,
    price_rect: Rect,
    last_close: f64,
    last_open: f64,
    adjusted_min: f64,
    adjusted_max: f64,
    bullish_color: Color32,
    bearish_color: Color32,
    show_right_axis: bool,
) {
    let adjusted_range = (adjusted_max - adjusted_min).max(1e-12);
    let y = price_rect.max.y
        - ((last_close - adjusted_min) / adjusted_range) as f32 * price_rect.height();

    let price_color = if last_close >= last_open {
        bullish_color
    } else {
        bearish_color
    };

    // Draw dashed horizontal line at last price
    let dash_len = 4.0;
    let gap_len = 3.0;
    let mut x = price_rect.min.x;
    while x < price_rect.max.x {
        let end_x = (x + dash_len).min(price_rect.max.x);
        painter.line_segment(
            [Pos2::new(x, y), Pos2::new(end_x, y)],
            Stroke::new(DESIGN_TOKENS.stroke.hairline, price_color),
        );
        x += dash_len + gap_len;
    }

    // Draw price label on the right with colored background
    if show_right_axis {
        let label = format!("{last_close:.2}");
        let label_pos = Pos2::new(price_rect.max.x + 5.0, y);

        // Measure text size first
        let galley = painter.layout_no_wrap(
            label.clone(),
            egui::FontId::proportional(typography::SM),
            DESIGN_TOKENS.semantic.chart.crosshair_label_text,
        );

        // Draw colored background box
        let padding = Vec2::new(6.0, 3.0);
        let label_rect = Rect::from_min_size(
            Pos2::new(label_pos.x, label_pos.y - galley.size().y / 2.0 - padding.y),
            galley.size() + padding * 2.0,
        );
        painter.rect_filled(label_rect, 2.0, price_color);

        // Draw text
        painter.galley(
            Pos2::new(label_pos.x + padding.x, label_pos.y - galley.size().y / 2.0),
            galley,
            Color32::TRANSPARENT,
        );
    }
}