feat(pineal): cierra stub export — PlanRecorder + exporter SVG
Fase F: primer stub de pineal cerrado. pineal-render: - PlanRecorder — un Canvas que graba cada llamada como RenderCmd en un RenderPlan. Es el puente painter→backend-diferido y la infraestructura de testing (snapshot de planes). pineal-export: - svg::to_svg(plan, w, h) — RenderPlan → documento SVG completo. Cubre FillRect/StrokeRect/StrokeLine/StrokePolyline/DrawText + FillTriangleStrip (strip→polígonos con color promedio). XML-escape en texto. v1: clips ignorados (documentado). - pdf queda como placeholder documentado. Tests: 1 recorder + 4 svg (well-formed, primitivas, xml-escape, triangle-strip→polygons). cargo check --workspace verde. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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sergio
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//! Exporter SVG: un [`RenderPlan`] → documento SVG completo.
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//!
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//! El mismo painter que dibuja en pantalla (vía el trait `Canvas`) se
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//! graba con un `PlanRecorder` y el plan resultante se vuelca acá. Un
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//! solo camino de código para screen y export.
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//!
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//! v1: los comandos de clip (`PushClip`/`PopClip`) se ignoran — el
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//! recorte no es crítico para la mayoría de exports y SVG `clipPath`
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//! agrega complejidad de IDs. Se puede agregar después sin romper API.
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use pineal_render::{Color, RenderCmd, RenderPlan};
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use std::fmt::Write;
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/// Convierte un `RenderPlan` a un documento SVG de `width × height`.
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pub fn to_svg(plan: &RenderPlan, width: f32, height: f32) -> String {
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let mut s = String::with_capacity(256 + plan.cmds.len() * 80);
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let _ = write!(
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s,
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"<svg xmlns=\"http://www.w3.org/2000/svg\" width=\"{width}\" \
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height=\"{height}\" viewBox=\"0 0 {width} {height}\">"
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);
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for cmd in &plan.cmds {
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emit_cmd(&mut s, cmd);
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}
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s.push_str("</svg>");
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s
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}
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fn emit_cmd(s: &mut String, cmd: &RenderCmd) {
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match cmd {
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// v1: clips ignorados (ver doc del módulo).
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RenderCmd::PushClip(_) | RenderCmd::PopClip => {}
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RenderCmd::FillRect { rect, color } => {
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let (c, a) = svg_color(*color);
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let _ = write!(
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s,
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"<rect x=\"{}\" y=\"{}\" width=\"{}\" height=\"{}\" \
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fill=\"{c}\" fill-opacity=\"{a}\"/>",
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rect.x, rect.y, rect.w, rect.h
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);
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}
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RenderCmd::StrokeRect { rect, stroke } => {
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let (c, a) = svg_color(stroke.color);
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let _ = write!(
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s,
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"<rect x=\"{}\" y=\"{}\" width=\"{}\" height=\"{}\" \
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fill=\"none\" stroke=\"{c}\" stroke-opacity=\"{a}\" \
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stroke-width=\"{}\"/>",
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rect.x, rect.y, rect.w, rect.h, stroke.width
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);
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}
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RenderCmd::StrokeLine { a: p0, b: p1, stroke } => {
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let (c, alpha) = svg_color(stroke.color);
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let _ = write!(
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s,
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"<line x1=\"{}\" y1=\"{}\" x2=\"{}\" y2=\"{}\" \
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stroke=\"{c}\" stroke-opacity=\"{alpha}\" stroke-width=\"{}\"/>",
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p0.x, p0.y, p1.x, p1.y, stroke.width
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);
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}
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RenderCmd::StrokePolyline { coords, stroke } => {
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let (c, alpha) = svg_color(stroke.color);
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s.push_str("<polyline points=\"");
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emit_points(s, coords);
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let _ = write!(
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s,
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"\" fill=\"none\" stroke=\"{c}\" stroke-opacity=\"{alpha}\" \
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stroke-width=\"{}\"/>",
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stroke.width
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);
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}
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RenderCmd::FillTriangleStrip { coords, colors } => {
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emit_triangle_strip(s, coords, colors);
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}
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RenderCmd::DrawText { p, text, color, size_px } => {
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let (c, a) = svg_color(*color);
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let _ = write!(
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s,
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"<text x=\"{}\" y=\"{}\" fill=\"{c}\" fill-opacity=\"{a}\" \
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font-size=\"{size_px}\">{}</text>",
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p.x, p.y, escape_xml(text)
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);
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}
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}
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}
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/// Emite `x0,y0 x1,y1 …` para el atributo `points` de polyline/polygon.
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fn emit_points(s: &mut String, coords: &[f32]) {
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for (i, pair) in coords.chunks_exact(2).enumerate() {
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if i > 0 {
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s.push(' ');
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}
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let _ = write!(s, "{},{}", pair[0], pair[1]);
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}
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}
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/// Un triangle strip de N vértices = N-2 triángulos. Cada triángulo se
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/// emite como `<polygon>` con el color promedio de sus 3 vértices (SVG
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/// no tiene gradient por-vértice trivial).
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fn emit_triangle_strip(s: &mut String, coords: &[f32], colors: &[Color]) {
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let n = coords.len() / 2;
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if n < 3 {
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return;
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}
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for t in 0..n - 2 {
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let (i0, i1, i2) = (t, t + 1, t + 2);
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let avg = avg_color(&[
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colors.get(i0).copied(),
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colors.get(i1).copied(),
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colors.get(i2).copied(),
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]);
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let (c, a) = svg_color(avg);
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let _ = write!(
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s,
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"<polygon points=\"{},{} {},{} {},{}\" fill=\"{c}\" fill-opacity=\"{a}\"/>",
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coords[i0 * 2], coords[i0 * 2 + 1],
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coords[i1 * 2], coords[i1 * 2 + 1],
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coords[i2 * 2], coords[i2 * 2 + 1],
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);
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}
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}
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fn avg_color(cs: &[Option<Color>]) -> Color {
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let mut acc = Color::rgba(0.0, 0.0, 0.0, 0.0);
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let mut n = 0.0;
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for c in cs.iter().flatten() {
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acc.r += c.r;
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acc.g += c.g;
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acc.b += c.b;
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acc.a += c.a;
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n += 1.0;
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}
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if n == 0.0 {
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return Color::TRANSPARENT;
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}
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Color::rgba(acc.r / n, acc.g / n, acc.b / n, acc.a / n)
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}
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/// `Color` f32 → (`rgb(R,G,B)` con enteros 0-255, alpha 0-1).
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fn svg_color(c: Color) -> (String, f32) {
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let to255 = |v: f32| (v.clamp(0.0, 1.0) * 255.0).round() as u8;
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(
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format!("rgb({},{},{})", to255(c.r), to255(c.g), to255(c.b)),
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c.a.clamp(0.0, 1.0),
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)
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}
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/// Escapa los 5 caracteres especiales de XML en contenido de texto.
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fn escape_xml(text: &str) -> String {
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let mut out = String::with_capacity(text.len());
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for ch in text.chars() {
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match ch {
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'&' => out.push_str("&"),
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'<' => out.push_str("<"),
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'>' => out.push_str(">"),
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'"' => out.push_str("""),
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'\'' => out.push_str("'"),
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c => out.push(c),
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}
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}
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out
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use pineal_render::{Canvas, Point, Rect, StrokeStyle};
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fn sample_plan() -> RenderPlan {
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let mut rec = pineal_render::PlanRecorder::new();
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rec.fill_rect(Rect::new(1.0, 2.0, 30.0, 40.0), Color::from_hex(0xff0000));
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rec.stroke_line(
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Point::new(0.0, 0.0),
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Point::new(100.0, 50.0),
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StrokeStyle::new(2.0, Color::BLACK),
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);
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rec.draw_text(Point::new(5.0, 10.0), "a<b&c", Color::WHITE, 12.0);
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rec.into_plan()
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}
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#[test]
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fn emits_well_formed_svg() {
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let svg = to_svg(&sample_plan(), 200.0, 100.0);
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assert!(svg.starts_with("<svg xmlns=\"http://www.w3.org/2000/svg\""));
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assert!(svg.ends_with("</svg>"));
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assert!(svg.contains("width=\"200\""));
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assert!(svg.contains("viewBox=\"0 0 200 100\""));
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}
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#[test]
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fn emits_each_primitive() {
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let svg = to_svg(&sample_plan(), 200.0, 100.0);
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assert!(svg.contains("<rect "));
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assert!(svg.contains("fill=\"rgb(255,0,0)\""));
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assert!(svg.contains("<line "));
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assert!(svg.contains("<text "));
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}
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#[test]
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fn escapes_xml_in_text() {
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let svg = to_svg(&sample_plan(), 200.0, 100.0);
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assert!(svg.contains("a<b&c"));
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assert!(!svg.contains("a<b&c"));
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}
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#[test]
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fn triangle_strip_becomes_polygons() {
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let mut rec = pineal_render::PlanRecorder::new();
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rec.fill_triangle_strip(
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&[0.0, 0.0, 10.0, 0.0, 5.0, 10.0, 15.0, 10.0],
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&[Color::WHITE, Color::WHITE, Color::WHITE, Color::WHITE],
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);
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let svg = to_svg(&rec.into_plan(), 20.0, 20.0);
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// 4 vértices → 2 triángulos → 2 polígonos.
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assert_eq!(svg.matches("<polygon").count(), 2);
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}
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}
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