de4a77e2bb
Code slides: - Theme code (broncode) background and text colours, with an optional syntax-colouring toggle. With it off the block renders monochrome, so a black background + bright green gives a classic CRT-screen look. - Colour pickers gained a custom hex entry so arbitrary colours (e.g. CRT green) can be set, not just presets. Exported HTML mirrors the code colours. Radar/spider charts: - Optional min/max now define the radar scale (centre/outer ring) instead of threshold lines. Evenly spaced, labelled tick rings are drawn in both the live preview and the SVG export so the scale is readable. A nice scale is derived from the data when no bounds are set. Line chart tooltips: - Detect the touched dot by true (x and y) distance instead of the x-only default, so the tooltip belongs to the point under the cursor. Overlapping dots all show, and the font shrinks a step when several stack. New UI strings are translated across all supported languages. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
676 lines
25 KiB
Dart
676 lines
25 KiB
Dart
import 'dart:convert';
|
|
import 'dart:math' as math;
|
|
import 'dart:typed_data';
|
|
|
|
import 'package:flutter/services.dart' show rootBundle;
|
|
|
|
import '../models/chart.dart';
|
|
import '../models/settings.dart';
|
|
|
|
/// Builds a single, self-contained HTML file from a deck's Marp Markdown.
|
|
///
|
|
/// The output embeds (inlines) `marked` for Markdown, `highlight.js` for code,
|
|
/// `MathJax` (tex-svg, so no external font files are needed) for math, and
|
|
/// `mermaid` for diagrams — so the resulting `.html` renders fully offline.
|
|
///
|
|
/// Note: this is a Marp-*flavoured* deck rendered with `marked`, not Marp Core,
|
|
/// so theme fidelity differs from the in-app preview / PDF / PPTX. The strength
|
|
/// here is a portable, dependency-free presentation that opens in any browser.
|
|
class MarpHtmlService {
|
|
/// Reads a bundled text asset (defaults to the Flutter asset bundle).
|
|
/// Injectable so the builder can be unit-tested against the on-disk files.
|
|
final Future<String> Function(String asset) loadAsset;
|
|
|
|
/// Reads a bundled binary asset (used to embed the EB Garamond font).
|
|
final Future<Uint8List> Function(String asset) loadBytes;
|
|
|
|
MarpHtmlService({
|
|
Future<String> Function(String asset)? loadAsset,
|
|
Future<Uint8List> Function(String asset)? loadBytes,
|
|
}) : loadAsset = loadAsset ?? rootBundle.loadString,
|
|
loadBytes =
|
|
loadBytes ??
|
|
((a) async => (await rootBundle.load(a)).buffer.asUint8List());
|
|
|
|
static const _assetDir = 'assets/web_export';
|
|
|
|
/// Builds the HTML. When [theme] is given, the slides take that profile's
|
|
/// colours and font so the export matches the in-app / PDF look.
|
|
Future<String> build(String deckMarkdown, {ThemeProfile? theme}) async {
|
|
final marked = await loadAsset('$_assetDir/marked.min.js');
|
|
final hljs = await loadAsset('$_assetDir/highlight.min.js');
|
|
final hljsCss = await loadAsset('$_assetDir/highlight.css');
|
|
final mathjax = await loadAsset('$_assetDir/tex-svg.js');
|
|
final mermaid = await loadAsset('$_assetDir/mermaid.min.js');
|
|
final css = theme == null ? _baseCss : await _themedCss(theme);
|
|
|
|
final sections = StringBuffer();
|
|
for (final slide in marpSlides(deckMarkdown)) {
|
|
sections
|
|
..write('<section class="slide"><script type="text/markdown">')
|
|
..write(_guard(renderChartBlocks(slide, theme: theme)))
|
|
..write('</script></section>');
|
|
}
|
|
|
|
String inline(String code) => '<script>${_guard(code)}</script>';
|
|
|
|
return '<!doctype html>\n'
|
|
'<html lang="nl"><head><meta charset="utf-8">'
|
|
'<meta name="viewport" content="width=device-width, initial-scale=1">'
|
|
'<title>OciDeck export</title>'
|
|
'<style>$css\n$hljsCss</style>'
|
|
'<script>$_mathjaxConfig</script>'
|
|
'${inline(marked)}'
|
|
'${inline(hljs)}'
|
|
'${inline(mathjax)}'
|
|
'${inline(mermaid)}'
|
|
'</head><body>'
|
|
'$sections'
|
|
'${inline(_renderScript)}'
|
|
'</body></html>';
|
|
}
|
|
|
|
/// Split Marp Markdown into per-slide Markdown chunks: drop the leading YAML
|
|
/// front-matter, then break on lines that contain only `---`.
|
|
static List<String> marpSlides(String markdown) {
|
|
var text = markdown.replaceAll('\r\n', '\n');
|
|
// Strip a leading YAML front-matter block: ---\n ... \n---\n
|
|
if (text.startsWith('---\n')) {
|
|
final close = text.indexOf('\n---', 4);
|
|
if (close != -1) {
|
|
final nl = text.indexOf('\n', close + 1);
|
|
text = nl == -1 ? '' : text.substring(nl + 1);
|
|
}
|
|
}
|
|
final slides = <String>[];
|
|
final buf = StringBuffer();
|
|
for (final line in text.split('\n')) {
|
|
if (line.trim() == '---') {
|
|
slides.add(buf.toString().trim());
|
|
buf.clear();
|
|
} else {
|
|
buf.writeln(line);
|
|
}
|
|
}
|
|
slides.add(buf.toString().trim());
|
|
return slides.where((s) => s.isNotEmpty).toList();
|
|
}
|
|
|
|
/// Neutralise any `</script` inside inlined content so it can't break out of
|
|
/// the surrounding <script> element. Safe for both JS (string contexts) and
|
|
/// the embedded Markdown payloads.
|
|
static String _guard(String s) => s
|
|
.replaceAll('</script', r'<\/script')
|
|
.replaceAll('</SCRIPT', r'<\/SCRIPT');
|
|
|
|
// ── Charts → inline SVG ────────────────────────────────────────────────────
|
|
|
|
static final RegExp _chartFence = RegExp(
|
|
r'```chart[ \t]*\n([\s\S]*?)\n```',
|
|
multiLine: true,
|
|
);
|
|
|
|
/// Replace ```chart fenced blocks with a self-contained inline SVG, so the
|
|
/// exported HTML renders charts without any JS chart library.
|
|
static String renderChartBlocks(String slideMarkdown, {ThemeProfile? theme}) {
|
|
return slideMarkdown.replaceAllMapped(_chartFence, (m) {
|
|
final spec = ChartSpec.parse(m.group(1)!);
|
|
return '\n<div class="chart">${_chartSvg(spec, theme)}</div>\n';
|
|
});
|
|
}
|
|
|
|
static String _esc(String s) => s
|
|
.replaceAll('&', '&')
|
|
.replaceAll('<', '<')
|
|
.replaceAll('>', '>');
|
|
|
|
static String _color(ChartSpec spec, int i, ThemeProfile? theme) {
|
|
final series = spec.series[i];
|
|
if (series.color == null && i == 0 && theme != null) {
|
|
return theme.accentColor;
|
|
}
|
|
return chartSeriesColor(series, i);
|
|
}
|
|
|
|
static String _chartSvg(ChartSpec spec, ThemeProfile? theme) {
|
|
if (!spec.hasInlineData) {
|
|
return '<svg viewBox="0 0 800 450" xmlns="http://www.w3.org/2000/svg"></svg>';
|
|
}
|
|
final textColor = theme?.textColor ?? '#111827';
|
|
final titleBackground = theme?.titleBackgroundColor ?? '#F8FAFC';
|
|
final titleColor = theme?.titleTextColor ?? textColor;
|
|
final accent = theme?.accentColor ?? '#2563EB';
|
|
final b = StringBuffer()
|
|
..write(
|
|
'<svg viewBox="0 0 800 450" xmlns="http://www.w3.org/2000/svg" '
|
|
'font-family="inherit" width="100%">',
|
|
);
|
|
if (spec.title.isNotEmpty) {
|
|
final title = spec.title.length > 52
|
|
? '${spec.title.substring(0, 51)}…'
|
|
: spec.title;
|
|
b
|
|
..write(
|
|
'<rect x="38" y="12" width="724" height="44" rx="9" '
|
|
'fill="$titleBackground"/>',
|
|
)
|
|
..write(
|
|
'<rect x="38" y="12" width="7" height="44" rx="3" fill="$accent"/>',
|
|
)
|
|
..write(
|
|
'<text x="62" y="41" font-size="23" font-weight="bold" '
|
|
'fill="$titleColor">${_esc(title)}</text>',
|
|
);
|
|
}
|
|
final plotTop = spec.title.isNotEmpty ? 68.0 : 20.0;
|
|
switch (spec.type) {
|
|
case ChartType.bar:
|
|
_barSvg(b, spec, plotTop, theme);
|
|
case ChartType.line:
|
|
_lineSvg(b, spec, plotTop, theme);
|
|
case ChartType.pie:
|
|
final legendRows = (spec.x.length / 6).ceil().clamp(1, 3);
|
|
_pieSvg(b, spec, plotTop, theme, bottom: 398 - (legendRows - 1) * 28);
|
|
case ChartType.radar:
|
|
_radarSvg(b, spec, plotTop, theme, textColor);
|
|
}
|
|
if (spec.type == ChartType.pie) {
|
|
_pieLegendSvg(b, spec, textColor);
|
|
} else {
|
|
_legendSvg(b, spec, theme, textColor);
|
|
}
|
|
b.write('</svg>');
|
|
return b.toString();
|
|
}
|
|
|
|
static void _legendSvg(
|
|
StringBuffer b,
|
|
ChartSpec spec,
|
|
ThemeProfile? theme,
|
|
String textColor,
|
|
) {
|
|
final count = math.min(spec.series.length, 6);
|
|
final cellWidth = 720.0 / count;
|
|
for (var i = 0; i < count; i++) {
|
|
final rawName = spec.series[i].name.isEmpty
|
|
? 'Reeks ${i + 1}'
|
|
: spec.series[i].name;
|
|
final name = rawName.length > 12
|
|
? '${rawName.substring(0, 11)}…'
|
|
: rawName;
|
|
final x = 40 + i * cellWidth;
|
|
b
|
|
..write(
|
|
'<rect x="$x" y="414" width="${cellWidth - 8}" height="24" rx="12" '
|
|
'fill="$textColor" fill-opacity=".05"/>',
|
|
)
|
|
..write(
|
|
'<circle cx="${x + 13}" cy="426" r="5" '
|
|
'fill="${_color(spec, i, theme)}"/>',
|
|
)
|
|
..write(
|
|
'<text x="${x + 24}" y="431" font-size="13" font-weight="600" '
|
|
'fill="$textColor">${_esc(name)}</text>',
|
|
);
|
|
}
|
|
}
|
|
|
|
static void _pieLegendSvg(StringBuffer b, ChartSpec spec, String textColor) {
|
|
const maxColumns = 6;
|
|
final columns = math.min(spec.x.length, maxColumns);
|
|
final rows = (spec.x.length / maxColumns).ceil().clamp(1, 3);
|
|
final cellWidth = 720.0 / columns;
|
|
final startY = 414.0 - (rows - 1) * 28;
|
|
for (var i = 0; i < spec.x.length; i++) {
|
|
final row = i ~/ maxColumns;
|
|
if (row >= rows) break;
|
|
final column = i % maxColumns;
|
|
final x = 40 + column * cellWidth;
|
|
final y = startY + row * 28;
|
|
final label = spec.x[i].length > 12
|
|
? '${spec.x[i].substring(0, 11)}…'
|
|
: spec.x[i];
|
|
b
|
|
..write(
|
|
'<rect x="$x" y="$y" width="${cellWidth - 8}" height="24" rx="12" '
|
|
'fill="$textColor" fill-opacity=".05"/>',
|
|
)
|
|
..write(
|
|
'<circle cx="${x + 13}" cy="${y + 12}" r="5" '
|
|
'fill="${chartRowColor(spec, i)}"/>',
|
|
)
|
|
..write(
|
|
'<text x="${x + 24}" y="${y + 17}" font-size="13" font-weight="600" '
|
|
'fill="$textColor">${_esc(label)}</text>',
|
|
);
|
|
}
|
|
}
|
|
|
|
static double _maxY(ChartSpec spec) {
|
|
var m = 0.0;
|
|
for (final s in spec.series) {
|
|
for (final v in s.data) {
|
|
if (v > m) m = v;
|
|
}
|
|
}
|
|
if (spec.supportsBounds) {
|
|
for (final b in [spec.minBound, spec.maxBound]) {
|
|
if (b != null && b > m) m = b;
|
|
}
|
|
}
|
|
return m <= 0 ? 1 : m * 1.15;
|
|
}
|
|
|
|
/// Draw the optional min/max threshold lines (bar/line only) as dashed rules.
|
|
static void _boundLinesSvg(
|
|
StringBuffer b,
|
|
ChartSpec spec,
|
|
double left,
|
|
double top,
|
|
double right,
|
|
double bottom,
|
|
double maxY,
|
|
) {
|
|
if (!spec.supportsBoundLines) return;
|
|
void draw(double? value, String color, String prefix) {
|
|
if (value == null || value < 0 || value > maxY) return;
|
|
final y = bottom - (bottom - top) * (value / maxY);
|
|
b
|
|
..write(
|
|
'<line x1="$left" y1="$y" x2="$right" y2="$y" stroke="$color" '
|
|
'stroke-width="2.5" stroke-dasharray="8 5"/>',
|
|
)
|
|
..write(
|
|
'<text x="${right - 4}" y="${y - 5}" text-anchor="end" '
|
|
'font-size="14" font-weight="700" fill="$color">'
|
|
'$prefix ${_num(value)}</text>',
|
|
);
|
|
}
|
|
|
|
draw(spec.minBound, '#F59E0B', 'min');
|
|
draw(spec.maxBound, '#EF4444', 'max');
|
|
}
|
|
|
|
static String _num(double v) =>
|
|
v == v.roundToDouble() ? v.toInt().toString() : v.toStringAsFixed(1);
|
|
|
|
static void _axes(
|
|
StringBuffer b,
|
|
ChartSpec spec,
|
|
double left,
|
|
double top,
|
|
double right,
|
|
double bottom,
|
|
double maxY,
|
|
) {
|
|
// Horizontal gridlines + y labels.
|
|
for (var i = 0; i <= 4; i++) {
|
|
final y = bottom - (bottom - top) * i / 4;
|
|
final val = maxY * i / 4;
|
|
b
|
|
..write(
|
|
'<line x1="$left" y1="$y" x2="$right" y2="$y" stroke="#e2e8f0" stroke-width="1"/>',
|
|
)
|
|
..write(
|
|
'<text x="${left - 8}" y="${y + 5}" text-anchor="end" font-size="14" fill="#64748b">${_num(val)}</text>',
|
|
);
|
|
}
|
|
// X labels.
|
|
final n = spec.x.length;
|
|
final step = math.max(1, (n / 8).ceil());
|
|
for (var i = 0; i < n; i++) {
|
|
if (i != n - 1 && i % step != 0) continue;
|
|
final x = left + (right - left) * (i + 0.5) / n;
|
|
final label = spec.x[i].length > 10
|
|
? '${spec.x[i].substring(0, 9)}…'
|
|
: spec.x[i];
|
|
b.write(
|
|
'<text x="$x" y="${bottom + 20}" text-anchor="middle" '
|
|
'font-size="13" fill="#334155">${_esc(label)}</text>',
|
|
);
|
|
}
|
|
}
|
|
|
|
static void _barSvg(
|
|
StringBuffer b,
|
|
ChartSpec spec,
|
|
double top,
|
|
ThemeProfile? theme,
|
|
) {
|
|
const left = 60.0, right = 770.0, bottom = 382.0;
|
|
final maxY = _maxY(spec);
|
|
_axes(b, spec, left, top, right, bottom, maxY);
|
|
final n = spec.x.length;
|
|
final groupW = (right - left) / n;
|
|
final sCount = spec.series.length;
|
|
final barW = (groupW * 0.7) / sCount;
|
|
for (var xi = 0; xi < n; xi++) {
|
|
final gx = left + groupW * xi + groupW * 0.15;
|
|
for (var si = 0; si < sCount; si++) {
|
|
if (xi >= spec.series[si].data.length) continue;
|
|
final v = spec.series[si].data[xi];
|
|
final h = (bottom - top) * (v / maxY);
|
|
final x = gx + barW * si;
|
|
b.write(
|
|
'<rect x="$x" y="${bottom - h}" width="${barW * 0.86}" height="$h" '
|
|
'rx="5" fill="${_color(spec, si, theme)}"/>',
|
|
);
|
|
}
|
|
}
|
|
_boundLinesSvg(b, spec, left, top, right, bottom, maxY);
|
|
}
|
|
|
|
static void _lineSvg(
|
|
StringBuffer b,
|
|
ChartSpec spec,
|
|
double top,
|
|
ThemeProfile? theme,
|
|
) {
|
|
const left = 60.0, right = 770.0, bottom = 382.0;
|
|
final maxY = _maxY(spec);
|
|
_axes(b, spec, left, top, right, bottom, maxY);
|
|
final n = spec.x.length;
|
|
double px(int i) => left + (right - left) * (i + 0.5) / n;
|
|
double py(double v) => bottom - (bottom - top) * (v / maxY);
|
|
for (var si = 0; si < spec.series.length; si++) {
|
|
final data = spec.series[si].data;
|
|
final pts = [
|
|
for (var i = 0; i < data.length; i++) '${px(i)},${py(data[i])}',
|
|
].join(' ');
|
|
b.write(
|
|
'<polyline points="$pts" fill="none" '
|
|
'stroke="${_color(spec, si, theme)}" stroke-width="4" '
|
|
'stroke-linecap="round" stroke-linejoin="round"/>',
|
|
);
|
|
for (var i = 0; i < data.length; i++) {
|
|
b.write(
|
|
'<circle cx="${px(i)}" cy="${py(data[i])}" r="5" '
|
|
'fill="${_color(spec, si, theme)}" stroke="white" stroke-width="2"/>',
|
|
);
|
|
}
|
|
}
|
|
_boundLinesSvg(b, spec, left, top, right, bottom, maxY);
|
|
}
|
|
|
|
static void _pieSvg(
|
|
StringBuffer b,
|
|
ChartSpec spec,
|
|
double top,
|
|
ThemeProfile? theme, {
|
|
required double bottom,
|
|
}) {
|
|
final count = math.min(spec.series.length, 2);
|
|
final columns = count;
|
|
final rows = (count / columns).ceil();
|
|
final cellWidth = 720.0 / columns;
|
|
final cellHeight = (bottom - top) / rows;
|
|
final radius = math.min(cellWidth * 0.25, cellHeight * 0.42);
|
|
for (var xi = 0; xi < count; xi++) {
|
|
final col = xi % columns;
|
|
final row = xi ~/ columns;
|
|
final cellLeft = 40 + cellWidth * col;
|
|
final cx = cellLeft + cellWidth * 0.36;
|
|
final cy = top + cellHeight * (row + 0.5);
|
|
final series = spec.series[xi];
|
|
final values = [
|
|
for (var labelIndex = 0; labelIndex < spec.x.length; labelIndex++)
|
|
labelIndex < series.data.length && series.data[labelIndex] > 0
|
|
? series.data[labelIndex]
|
|
: 0.0,
|
|
];
|
|
final total = values.fold<double>(0, (a, v) => a + v);
|
|
var angle = -90.0;
|
|
for (var labelIndex = 0; labelIndex < values.length; labelIndex++) {
|
|
final frac = total > 0 ? values[labelIndex] / total : 0;
|
|
final sweep = frac * 360;
|
|
if (sweep <= 0) continue;
|
|
final a0 = angle * math.pi / 180;
|
|
final a1 = (angle + sweep) * math.pi / 180;
|
|
final x0 = cx + radius * math.cos(a0);
|
|
final y0 = cy + radius * math.sin(a0);
|
|
final x1 = cx + radius * math.cos(a1);
|
|
final y1 = cy + radius * math.sin(a1);
|
|
final large = sweep > 180 ? 1 : 0;
|
|
b.write(
|
|
'<path d="M$cx,$cy L$x0,$y0 A$radius,$radius 0 $large,1 '
|
|
'$x1,$y1 Z" '
|
|
'fill="${chartRowColor(spec, labelIndex)}" '
|
|
'stroke="white" '
|
|
'stroke-width="2"/>',
|
|
);
|
|
angle += sweep;
|
|
}
|
|
b
|
|
..write('<circle cx="$cx" cy="$cy" r="${radius * 0.43}" fill="white"/>')
|
|
..write(
|
|
'<text x="${cellLeft + cellWidth * 0.66}" y="${cy + 5}" '
|
|
'font-size="14" font-weight="700">'
|
|
'${_esc(_shortChartLabel(series.name.isEmpty ? 'Reeks ${xi + 1}' : series.name))}</text>',
|
|
);
|
|
}
|
|
}
|
|
|
|
static void _radarSvg(
|
|
StringBuffer b,
|
|
ChartSpec spec,
|
|
double top,
|
|
ThemeProfile? theme,
|
|
String textColor,
|
|
) {
|
|
final n = spec.x.length;
|
|
if (n < 3 || spec.series.isEmpty) return;
|
|
const bottom = 382.0;
|
|
const cx = 400.0;
|
|
final cy = (top + bottom) / 2;
|
|
final radius = math.min(170.0, (bottom - top) / 2 - 34);
|
|
final (lo, hi, ticks) = _radarScale(spec);
|
|
final span = (hi - lo) == 0 ? 1.0 : (hi - lo);
|
|
double angle(int i) => -math.pi / 2 + 2 * math.pi * i / n;
|
|
|
|
// Concentric grid rings, evenly spaced across the [lo, hi] scale.
|
|
for (var ring = 1; ring <= ticks; ring++) {
|
|
final rr = radius * ring / ticks;
|
|
final pts = [
|
|
for (var i = 0; i < n; i++)
|
|
'${cx + rr * math.cos(angle(i))},${cy + rr * math.sin(angle(i))}',
|
|
].join(' ');
|
|
b.write(
|
|
'<polygon points="$pts" fill="none" stroke="#e2e8f0" '
|
|
'stroke-width="1"/>',
|
|
);
|
|
}
|
|
|
|
// Scale labels up the top spoke: lo at the centre, hi at the outer ring.
|
|
for (var k = 0; k <= ticks; k++) {
|
|
final value = lo + span * k / ticks;
|
|
final y = cy - radius * k / ticks;
|
|
b.write(
|
|
'<text x="${cx + 6}" y="${y - 2}" font-size="11" '
|
|
'fill="#94a3b8">${_num(value)}</text>',
|
|
);
|
|
}
|
|
|
|
// Spokes and axis labels.
|
|
for (var i = 0; i < n; i++) {
|
|
final c = math.cos(angle(i));
|
|
final s = math.sin(angle(i));
|
|
b.write(
|
|
'<line x1="$cx" y1="$cy" x2="${cx + radius * c}" '
|
|
'y2="${cy + radius * s}" stroke="#e2e8f0" stroke-width="1"/>',
|
|
);
|
|
final anchor = c > 0.3 ? 'start' : (c < -0.3 ? 'end' : 'middle');
|
|
final label = spec.x[i].length > 12
|
|
? '${spec.x[i].substring(0, 11)}…'
|
|
: spec.x[i];
|
|
b.write(
|
|
'<text x="${cx + (radius + 18) * c}" y="${cy + (radius + 18) * s + 4}" '
|
|
'text-anchor="$anchor" font-size="13" fill="$textColor">'
|
|
'${_esc(label)}</text>',
|
|
);
|
|
}
|
|
|
|
// One filled polygon per series.
|
|
for (var si = 0; si < spec.series.length; si++) {
|
|
final data = spec.series[si].data;
|
|
final pts = [
|
|
for (var i = 0; i < n; i++)
|
|
() {
|
|
final v = i < data.length ? data[i] : 0.0;
|
|
final rr = radius * ((v - lo) / span).clamp(0.0, 1.0);
|
|
return '${cx + rr * math.cos(angle(i))},'
|
|
'${cy + rr * math.sin(angle(i))}';
|
|
}(),
|
|
].join(' ');
|
|
final color = _color(spec, si, theme);
|
|
b.write(
|
|
'<polygon points="$pts" fill="$color" fill-opacity="0.16" '
|
|
'stroke="$color" stroke-width="3" stroke-linejoin="round"/>',
|
|
);
|
|
}
|
|
}
|
|
|
|
/// Radar scale shared with the live preview: honour optional min/max bounds,
|
|
/// otherwise round the data range to a tidy scale with an even tick count.
|
|
static (double, double, int) _radarScale(ChartSpec spec) {
|
|
var dataMin = 0.0;
|
|
var dataMax = 0.0;
|
|
var seen = false;
|
|
for (final s in spec.series) {
|
|
for (final v in s.data) {
|
|
if (!seen) {
|
|
dataMin = v;
|
|
dataMax = v;
|
|
seen = true;
|
|
} else {
|
|
if (v < dataMin) dataMin = v;
|
|
if (v > dataMax) dataMax = v;
|
|
}
|
|
}
|
|
}
|
|
if (!seen) {
|
|
dataMin = 0;
|
|
dataMax = 1;
|
|
}
|
|
final rawLo = spec.minBound ?? (dataMin < 0 ? dataMin : 0);
|
|
final rawHi = spec.maxBound ?? dataMax;
|
|
final range = (rawHi - rawLo).abs();
|
|
final r = range <= 0 ? 1.0 : range;
|
|
final rawStep = r / 4;
|
|
final mag = math.pow(10, (math.log(rawStep) / math.ln10).floor()).toDouble();
|
|
final norm = rawStep / mag;
|
|
final niceNorm = norm < 1.5
|
|
? 1.0
|
|
: norm < 3
|
|
? 2.0
|
|
: norm < 7
|
|
? 5.0
|
|
: 10.0;
|
|
final step = niceNorm * mag;
|
|
final lo = spec.minBound ?? (rawLo / step).floorToDouble() * step;
|
|
var hi = spec.maxBound ?? (rawHi / step).ceilToDouble() * step;
|
|
if (hi <= lo) hi = lo + step;
|
|
final ticks = math.max(2, ((hi - lo) / step).round());
|
|
return (lo, hi, ticks);
|
|
}
|
|
|
|
static String _shortChartLabel(String value) =>
|
|
value.length > 13 ? '${value.substring(0, 12)}…' : value;
|
|
|
|
/// CSS that mirrors the deck's [ThemeProfile]: slide background, text and
|
|
/// accent colours, table colours and font. The EB Garamond font is embedded
|
|
/// (base64) so it renders offline; other fonts resolve to system families.
|
|
Future<String> _themedCss(ThemeProfile t) async {
|
|
final fontFace = await _ebGaramondFontFace(t.fontFamily);
|
|
final family = _cssFontStack(t.fontFamily);
|
|
return '$fontFace\n'
|
|
'*{box-sizing:border-box}'
|
|
'html,body{margin:0;padding:0}'
|
|
'body{background:#1e1e1e;font-family:$family;color:${t.textColor}}'
|
|
'.slide{position:relative;width:1280px;min-height:720px;margin:24px auto;'
|
|
'background:${t.slideBackgroundColor};color:${t.textColor};padding:60px;'
|
|
'overflow:hidden;box-shadow:0 4px 24px rgba(0,0,0,.4);border-radius:4px;'
|
|
'font-family:$family}'
|
|
'.slide h1{font-size:48px;margin:.15em 0;color:${t.textColor}}'
|
|
'.slide h2{font-size:34px;margin:.15em 0;color:${t.accentColor}}'
|
|
'.slide a{color:${t.accentColor}}'
|
|
'.slide p,.slide li{font-size:24px;line-height:1.45}'
|
|
'.slide pre{background:${t.codeBackgroundColor};color:${t.codeTextColor};'
|
|
'border:1px solid ${t.codeTextColor}38;border-radius:6px;'
|
|
'padding:16px;overflow:auto;font-size:18px}'
|
|
'.slide pre code{color:${t.codeTextColor};background:transparent}'
|
|
'.slide code{font-family:SFMono-Regular,Consolas,"Liberation Mono",monospace}'
|
|
'.slide pre.mermaid{background:transparent;border:0;text-align:center}'
|
|
'.slide img{max-width:100%}'
|
|
'.slide blockquote{border-left:4px solid ${t.accentColor};margin:.5em 0;'
|
|
'padding-left:16px;opacity:.85}'
|
|
'.slide table{border-collapse:collapse}'
|
|
'.slide th{background:${t.sectionBackgroundColor};color:${t.tableHeaderTextColor};'
|
|
'border:1px solid #ccc;padding:6px 12px;font-size:20px}'
|
|
'.slide td{color:${t.tableTextColor};border:1px solid #ccc;padding:6px 12px;font-size:20px}'
|
|
'@media print{body{background:#fff}.slide{margin:0;box-shadow:none;'
|
|
'border-radius:0;page-break-after:always;width:100%;min-height:100vh}}';
|
|
}
|
|
|
|
String _cssFontStack(String font) {
|
|
if (font == 'EB Garamond') return "'EB Garamond', Georgia, serif";
|
|
const serif = {'Georgia', 'Times New Roman'};
|
|
final generic = serif.contains(font) ? 'serif' : 'sans-serif';
|
|
return "'$font', $generic";
|
|
}
|
|
|
|
/// Embed the bundled EB Garamond variable font as base64 so it works offline.
|
|
/// Returns an empty string for any other (system) font.
|
|
Future<String> _ebGaramondFontFace(String font) async {
|
|
if (font != 'EB Garamond') return '';
|
|
try {
|
|
final bytes = await loadBytes('assets/fonts/EBGaramond-Variable.ttf');
|
|
final b64 = base64Encode(bytes);
|
|
return "@font-face{font-family:'EB Garamond';font-weight:400 800;"
|
|
"font-style:normal;src:url(data:font/ttf;base64,$b64) "
|
|
"format('truetype');}";
|
|
} catch (_) {
|
|
return ''; // Fall back to the CSS font stack if the asset is missing.
|
|
}
|
|
}
|
|
|
|
static const _mathjaxConfig =
|
|
r'''window.MathJax={tex:{inlineMath:[['$','$']],displayMath:[['$$','$$']]},svg:{fontCache:'global'},startup:{typeset:false}};''';
|
|
|
|
static const _baseCss = r'''
|
|
*{box-sizing:border-box}
|
|
html,body{margin:0;padding:0}
|
|
body{background:#1e1e1e;font-family:-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;color:#1a1a1a}
|
|
.slide{position:relative;width:1280px;min-height:720px;margin:24px auto;background:#fff;padding:60px;overflow:hidden;box-shadow:0 4px 24px rgba(0,0,0,.4);border-radius:4px}
|
|
.slide h1{font-size:48px;margin:.15em 0}
|
|
.slide h2{font-size:34px;margin:.15em 0}
|
|
.slide p,.slide li{font-size:24px;line-height:1.45}
|
|
.slide pre{background:#f6f8fa;border:1px solid #e1e4e8;border-radius:6px;padding:16px;overflow:auto;font-size:18px}
|
|
.slide code{font-family:SFMono-Regular,Consolas,"Liberation Mono",monospace}
|
|
.slide pre.mermaid{background:transparent;border:0;text-align:center}
|
|
.slide img{max-width:100%}
|
|
.slide blockquote{border-left:4px solid #ccc;margin:.5em 0;padding-left:16px;color:#555}
|
|
.slide table{border-collapse:collapse}.slide th,.slide td{border:1px solid #ccc;padding:6px 12px;font-size:20px}
|
|
@media print{body{background:#fff}.slide{margin:0;box-shadow:none;border-radius:0;page-break-after:always;width:100%;min-height:100vh}}
|
|
''';
|
|
|
|
static const _renderScript = r'''
|
|
(function(){
|
|
if(window.marked&&marked.setOptions){marked.setOptions({gfm:true,breaks:false});}
|
|
document.querySelectorAll('section.slide').forEach(function(sec){
|
|
var holder=sec.querySelector('script[type="text/markdown"]');
|
|
var src=holder?holder.textContent:'';
|
|
var div=document.createElement('div');div.className='content';
|
|
div.innerHTML=window.marked?marked.parse(src):src;
|
|
sec.innerHTML='';sec.appendChild(div);
|
|
});
|
|
document.querySelectorAll('code.language-mermaid').forEach(function(code){
|
|
var pre=code.closest('pre');if(!pre)return;
|
|
var holder=document.createElement('pre');holder.className='mermaid';
|
|
holder.textContent=code.textContent;pre.replaceWith(holder);
|
|
});
|
|
if(window.hljs){document.querySelectorAll('pre code').forEach(function(el){try{hljs.highlightElement(el);}catch(e){}});}
|
|
if(window.mermaid){try{mermaid.initialize({startOnLoad:false});mermaid.run();}catch(e){}}
|
|
if(window.MathJax&&MathJax.typesetPromise){MathJax.typesetPromise();}
|
|
})();
|
|
''';
|
|
}
|