merman-render 0.8.0-alpha.2

Headless layout + SVG renderer for Mermaid (parity-focused; upstream SVG goldens).
Documentation 
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//! Flowchart v2 rounded rectangle shape.

use std::fmt::Write as _;

use crate::svg::parity::flowchart::escape_attr;
use crate::svg::parity::{fmt, fmt_display};

use super::super::geom::{arc_points, path_from_points};
use super::super::roughjs::roughjs_hachure_paths_for_svg_path;

const FLOWCHART_NODE_HAND_DRAWN_ROUGHNESS: f32 = 0.7;
const FLOWCHART_NODE_HAND_DRAWN_FILL_WEIGHT: f32 = 4.0;
const FLOWCHART_NODE_HAND_DRAWN_HACHURE_GAP: f32 = 5.2;

pub(in crate::svg::parity::flowchart::render::node) fn render_rounded_rect(
    out: &mut String,
    _ctx: &crate::svg::parity::flowchart::types::FlowchartRenderCtx<'_>,
    common: &super::super::FlowchartNodeRenderCommon<'_>,
    details: &mut crate::svg::parity::flowchart::types::FlowchartRenderDetails,
) {
    let w = common.layout_node.width.max(1.0);
    let h = common.layout_node.height.max(1.0);
    let radius = 5.0;
    let taper = 5.0;

    let mut pts: Vec<(f64, f64)> = Vec::new();
    pts.push((-w / 2.0 + taper, -h / 2.0));
    pts.push((w / 2.0 - taper, -h / 2.0));
    pts.extend(arc_points(
        w / 2.0 - taper,
        -h / 2.0,
        w / 2.0,
        -h / 2.0 + taper,
        radius,
        radius,
        true,
    ));
    pts.push((w / 2.0, -h / 2.0 + taper));
    pts.push((w / 2.0, h / 2.0 - taper));
    pts.extend(arc_points(
        w / 2.0,
        h / 2.0 - taper,
        w / 2.0 - taper,
        h / 2.0,
        radius,
        radius,
        true,
    ));
    pts.push((w / 2.0 - taper, h / 2.0));
    pts.push((-w / 2.0 + taper, h / 2.0));
    pts.extend(arc_points(
        -w / 2.0 + taper,
        h / 2.0,
        -w / 2.0,
        h / 2.0 - taper,
        radius,
        radius,
        true,
    ));
    pts.push((-w / 2.0, h / 2.0 - taper));
    pts.push((-w / 2.0, -h / 2.0 + taper));
    pts.extend(arc_points(
        -w / 2.0,
        -h / 2.0 + taper,
        -w / 2.0 + taper,
        -h / 2.0,
        radius,
        radius,
        true,
    ));
    let path_data = path_from_points(&pts);

    let rough_paths = if common.look_is_hand_drawn() {
        super::super::helpers::timed_node_roughjs(common.timing_enabled, details, || {
            roughjs_hachure_paths_for_svg_path(
                &path_data,
                common.fill_color,
                common.stroke_color,
                common.stroke_width,
                common.stroke_dasharray,
                FLOWCHART_NODE_HAND_DRAWN_FILL_WEIGHT,
                FLOWCHART_NODE_HAND_DRAWN_HACHURE_GAP,
                FLOWCHART_NODE_HAND_DRAWN_ROUGHNESS,
                common.hand_drawn_seed,
            )
        })
    } else {
        None
    };

    if let Some((fill_d, stroke_d)) = rough_paths {
        let _ = write!(
            out,
            r#"<g class="basic label-container" style="{}">"#,
            escape_attr(common.rough_group_style)
        );
        let _ = write!(
            out,
            r#"<path d="{}" stroke="{}" stroke-width="{}" fill="none" stroke-dasharray="0 0"/>"#,
            escape_attr(&fill_d),
            escape_attr(common.fill_color),
            fmt_display(FLOWCHART_NODE_HAND_DRAWN_FILL_WEIGHT as f64),
        );
        let _ = write!(
            out,
            r#"<path d="{}" stroke="{}" stroke-width="{}" fill="none" stroke-dasharray="{}"/>"#,
            escape_attr(&stroke_d),
            escape_attr(common.stroke_color),
            common.stroke_width,
            escape_attr(common.stroke_dasharray),
        );
        out.push_str("</g>");
    } else {
        let _ = write!(
            out,
            r#"<rect class="basic label-container" style="{}" x="{}" y="{}" width="{}" height="{}" rx="5" ry="5"/>"#,
            escape_attr(common.style),
            fmt(-w / 2.0),
            fmt(-h / 2.0),
            fmt(w),
            fmt(h)
        );
    }
}