merman-render 0.8.0

Headless layout + SVG renderer for Mermaid (parity-focused; upstream SVG goldens).
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33

//! Node geometry helpers (point generation and path assembly).
//!
//! These are ports of Mermaid rendering-element helpers and are used by multiple node shapes.

pub(super) use crate::svg::parity::roughjs_common::{
    closed_path_d_from_points as path_from_points, mermaid_arc_points as arc_points,
};

pub(in crate::svg::parity::flowchart) fn generate_full_sine_wave_points(
    x1: f64,
    y1: f64,
    x2: f64,
    y2: f64,
    amplitude: f64,
    num_cycles: f64,
) -> Vec<(f64, f64)> {
    // Ported from Mermaid `generateFullSineWavePoints` (50 segments).
    let steps: usize = 50;
    let delta_x = x2 - x1;
    let delta_y = y2 - y1;
    let cycle_length = delta_x / num_cycles;
    let frequency = (2.0 * std::f64::consts::PI) / cycle_length;
    let mid_y = y1 + delta_y / 2.0;

    let mut points: Vec<(f64, f64)> = Vec::with_capacity(steps + 1);
    for i in 0..=steps {
        let t = (i as f64) / (steps as f64);
        let x = x1 + t * delta_x;
        let y = mid_y + amplitude * (frequency * (x - x1)).sin();
        points.push((x, y));
    }
    points
}