invoice/
invoice.rs

1//! Example: a German business invoice — DIN-5008-style window-envelope
2//! address block, a striped multi-page position table (header repeats
3//! automatically across pages), a right-aligned Netto/USt/Brutto summary
4//! block, and a footer with bank details/VAT ID + page numbers.
5//! (Phase 6 DoD, `plan/phases/phase-6-business-polish.md`.)
6//!
7//! Run: `cargo run -p lightweight-pdf --example invoice`
8
9use lightweight_pdf::*;
10
11/// PDF points per millimeter (72pt / 25.4mm).
12const MM: f32 = 72.0 / 25.4;
13
14struct LineItem {
15    description: String,
16    qty: u32,
17    unit_price_cents: i64,
18}
19
20fn main() {
21    let mut items = vec![
22        LineItem {
23            description: "Beratungsleistung Projekt Alpha".to_string(),
24            qty: 8,
25            unit_price_cents: 12_000,
26        },
27        LineItem {
28            description: "Lizenz Software-Paket (jährlich)".to_string(),
29            qty: 1,
30            unit_price_cents: 49_900,
31        },
32        LineItem {
33            description: "Individuelle Anpassung / Customizing".to_string(),
34            qty: 3,
35            unit_price_cents: 15_000,
36        },
37    ];
38    // A few filler positions so the table is guaranteed to span more than
39    // one page, demonstrating the header-repeat-on-split behavior.
40    for i in 1..=25 {
41        items.push(LineItem {
42            description: format!("Zusatzposition {i:02}"),
43            qty: 1,
44            unit_price_cents: 990,
45        });
46    }
47
48    let net_total: i64 = items.iter().map(|i| i.qty as i64 * i.unit_price_cents).sum();
49    let vat_rate = 19;
50    let vat_total = net_total * vat_rate / 100;
51    let gross_total = net_total + vat_total;
52
53    let top_margin = 15.0 * MM;
54    let mut doc = Document::new(PageFormat::A4)
55        .margin(Margin::symmetric(20.0 * MM, top_margin))
56        .footer(Footer::new(30.0, |ctx| {
57            Column::new()
58                .gap(2.0)
59                .child(Line::new())
60                .child(
61                    Row::new()
62                        .gap(20.0)
63                        .child(Text::new("Musterbank · IBAN DE12 3456 7890 1234 5678 90 · BIC MUSTDEFF").size(8.0))
64                        .child(Text::new("USt-IdNr. DE123456789").size(8.0).flex(1.0)),
65                )
66                .child(Text::new(format!("Seite {} von {}", ctx.page, ctx.total_pages)).size(8.0))
67                .into()
68        }));
69
70    // --- DIN 5008 Form A window-envelope address block ----------------
71    // Window starts ~45mm from the top, ~20mm from the left
72    // (`plan/02-elementcatalog-and-features.md`); ~85x40mm matches a
73    // typical C6/5-long window envelope opening. Position/size are a
74    // documented convention for this recipe, not parsed from any norm
75    // document — a caller with different envelope stock adjusts these.
76    doc.add(Spacer::new(45.0 * MM - top_margin));
77    doc.add(
78        Column::new()
79            .gap(2.0)
80            .width(85.0 * MM)
81            .height(40.0 * MM)
82            .child(Text::new("Muster GmbH · Musterstraße 1 · 12345 Musterstadt").size(7.0))
83            .child(Spacer::new(8.0))
84            .child(Text::new("Empfänger GmbH"))
85            .child(Text::new("Frau Erika Mustermann"))
86            .child(Text::new("Beispielweg 42"))
87            .child(Text::new("54321 Beispielstadt")),
88    );
89    doc.add(Spacer::new(10.0 * MM));
90
91    doc.add(Text::new("Rechnung").heading1());
92    doc.add(Text::new(
93        "Rechnungsnummer: RE-2026-0142    Rechnungsdatum: 20.08.2026    Leistungsdatum: 20.08.2026",
94    ));
95    doc.add(Spacer::new(10.0));
96
97    doc.add(
98        Table::new()
99            .columns([
100                TableColumn::flex(1.0),
101                TableColumn::fixed(50.0).align(Align::End),
102                TableColumn::fixed(65.0).align(Align::End),
103                TableColumn::fixed(70.0).align(Align::End),
104            ])
105            .header(["Beschreibung", "Menge", "Einzelpreis", "Gesamt"])
106            .striped(Color::rgb(0xF5, 0xF5, 0xF5))
107            .rows(items.iter().map(|item| {
108                let total = item.qty as i64 * item.unit_price_cents;
109                vec![
110                    Element::from(item.description.as_str()),
111                    Element::from(item.qty.to_string()),
112                    Element::from(format_currency_de(item.unit_price_cents)),
113                    Element::from(format_currency_de(total)),
114                ]
115            })),
116    );
117
118    doc.add(Spacer::new(14.0));
119
120    // --- summary block (Netto/USt/Brutto), right-aligned --------------
121    // Recipe (`plan/02-elementcatalog-and-features.md`): an outer, full-
122    // width auto Column with `.align(Align::End)` positions the fixed-
123    // width (200pt) inner summary Column at the right edge; within it,
124    // each label gets `.flex(1.0)` to push its value to that block's own
125    // right edge. No special "summary block" element needed.
126    doc.add(
127        Column::new()
128            .align(Align::End)
129            .child(Column::new().gap(2.0).width(200.0).children(vec![
130                Element::from(
131                    Row::new()
132                        .child(Text::new("Nettosumme").flex(1.0))
133                        .child(Text::new(format_currency_de(net_total))),
134                ),
135                Element::from(
136                    Row::new()
137                        .child(Text::new(format!("zzgl. {vat_rate}% USt.")).flex(1.0))
138                        .child(Text::new(format_currency_de(vat_total))),
139                ),
140                Element::from(Line::new()),
141                Element::from(
142                    Row::new()
143                        .child(Text::new("Gesamtbetrag").bold().flex(1.0))
144                        .child(Text::new(format_currency_de(gross_total)).bold()),
145                ),
146            ])),
147    );
148
149    let bytes = doc.render().expect("render should succeed");
150    std::fs::write("invoice.pdf", &bytes).expect("write invoice.pdf");
151    println!("wrote invoice.pdf ({} bytes)", bytes.len());
152}
invoice/invoice.rs

invoice/
invoice.rs
