zcatpdf/examples/invoice.zig

//! Invoice PDF example - Demonstrates a realistic use case

const std = @import("std");
const pdf = @import("zpdf");

pub fn main() !void {
    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
    defer _ = gpa.deinit();
    const allocator = gpa.allocator();

    std.debug.print("zpdf - Invoice example\n", .{});

    var doc = pdf.Document.init(allocator);
    defer doc.deinit();

    var page = try doc.addPage(.a4);

    // Company header
    try page.setFont(.helvetica_bold, 24);
    page.setFillColor(pdf.Color{ .r = 41, .g = 98, .b = 255 }); // Blue
    try page.drawText(50, 780, "ACME Corporation");

    try page.setFont(.helvetica, 10);
    page.setFillColor(pdf.Color.gray);
    try page.drawText(50, 765, "123 Business Street, City 12345");
    try page.drawText(50, 753, "Tel: +34 123 456 789 | Email: info@acme.com");
    try page.drawText(50, 741, "CIF: B12345678");

    // Invoice title
    try page.setFont(.helvetica_bold, 28);
    page.setFillColor(pdf.Color.black);
    try page.drawText(400, 780, "FACTURA");

    try page.setFont(.helvetica, 12);
    try page.drawText(400, 760, "No: FAC-2025-0001");
    try page.drawText(400, 745, "Fecha: 08/12/2025");

    // Separator line
    try page.setLineWidth(1);
    page.setStrokeColor(pdf.Color.light_gray);
    try page.drawLine(50, 720, 545, 720);

    // Client info box
    page.setFillColor(pdf.Color{ .r = 245, .g = 245, .b = 245 });
    try page.fillRect(50, 640, 250, 70);

    try page.setFont(.helvetica_bold, 11);
    page.setFillColor(pdf.Color.black);
    try page.drawText(60, 695, "CLIENTE:");

    try page.setFont(.helvetica, 11);
    try page.drawText(60, 680, "Empresa Cliente S.L.");
    try page.drawText(60, 667, "Calle Principal 45, 2o B");
    try page.drawText(60, 654, "08001 Barcelona");
    try page.drawText(60, 641, "NIF: B87654321");

    // Table header
    const table_top: f32 = 610;
    const col1: f32 = 50;
    const col2: f32 = 300;
    const col3: f32 = 370;
    const col4: f32 = 430;
    const col5: f32 = 490;
    const row_height: f32 = 25;

    // Header background
    page.setFillColor(pdf.Color{ .r = 41, .g = 98, .b = 255 });
    try page.fillRect(col1, table_top - row_height, 495, row_height);

    // Header text
    try page.setFont(.helvetica_bold, 10);
    page.setFillColor(pdf.Color.white);
    try page.drawText(col1 + 5, table_top - 18, "DESCRIPCION");
    try page.drawText(col2 + 5, table_top - 18, "CANT.");
    try page.drawText(col3 + 5, table_top - 18, "PRECIO");
    try page.drawText(col4 + 5, table_top - 18, "IVA");
    try page.drawText(col5 + 5, table_top - 18, "TOTAL");

    // Table rows
    const items = [_]struct { desc: []const u8, qty: []const u8, price: []const u8, vat: []const u8, total: []const u8 }{
        .{ .desc = "Servicio de consultoria", .qty = "10h", .price = "50.00", .vat = "21%", .total = "605.00" },
        .{ .desc = "Desarrollo web", .qty = "1", .price = "1500.00", .vat = "21%", .total = "1815.00" },
        .{ .desc = "Mantenimiento mensual", .qty = "1", .price = "200.00", .vat = "21%", .total = "242.00" },
        .{ .desc = "Hosting anual", .qty = "1", .price = "120.00", .vat = "21%", .total = "145.20" },
    };

    try page.setFont(.helvetica, 10);
    page.setFillColor(pdf.Color.black);

    var y = table_top - row_height;
    for (items, 0..) |item, i| {
        y -= row_height;

        // Alternate row background
        if (i % 2 == 0) {
            page.setFillColor(pdf.Color{ .r = 250, .g = 250, .b = 250 });
            try page.fillRect(col1, y, 495, row_height);
        }

        // Row content
        page.setFillColor(pdf.Color.black);
        try page.setFont(.helvetica, 10);
        try page.drawText(col1 + 5, y + 8, item.desc);
        try page.drawText(col2 + 5, y + 8, item.qty);
        try page.drawText(col3 + 5, y + 8, item.price);
        try page.drawText(col4 + 5, y + 8, item.vat);
        try page.drawText(col5 + 5, y + 8, item.total);

        // Row border
        page.setStrokeColor(pdf.Color.light_gray);
        try page.drawLine(col1, y, col1 + 495, y);
    }

    // Table border
    try page.setLineWidth(0.5);
    page.setStrokeColor(pdf.Color.gray);
    try page.drawRect(col1, y, 495, table_top - y - row_height);

    // Vertical lines
    try page.drawLine(col2, y, col2, table_top - row_height);
    try page.drawLine(col3, y, col3, table_top - row_height);
    try page.drawLine(col4, y, col4, table_top - row_height);
    try page.drawLine(col5, y, col5, table_top - row_height);

    // Totals section
    const totals_y = y - 40;

    try page.setFont(.helvetica, 11);
    page.setFillColor(pdf.Color.black);
    try page.drawText(380, totals_y, "Subtotal:");
    try page.drawText(480, totals_y, "2,320.00");

    try page.drawText(380, totals_y - 18, "IVA (21%):");
    try page.drawText(480, totals_y - 18, "487.20");

    // Total line
    try page.setLineWidth(1);
    page.setStrokeColor(pdf.Color.black);
    try page.drawLine(380, totals_y - 30, 545, totals_y - 30);

    try page.setFont(.helvetica_bold, 14);
    try page.drawText(380, totals_y - 48, "TOTAL:");
    try page.drawText(475, totals_y - 48, "2,807.20 EUR");

    // Payment info
    const payment_y = totals_y - 100;

    page.setFillColor(pdf.Color{ .r = 245, .g = 245, .b = 245 });
    try page.fillRect(50, payment_y - 50, 300, 70);

    try page.setFont(.helvetica_bold, 10);
    page.setFillColor(pdf.Color.black);
    try page.drawText(60, payment_y + 5, "FORMA DE PAGO:");

    try page.setFont(.helvetica, 10);
    try page.drawText(60, payment_y - 10, "Transferencia bancaria");
    try page.drawText(60, payment_y - 25, "IBAN: ES12 1234 5678 9012 3456 7890");
    try page.drawText(60, payment_y - 40, "Vencimiento: 30 dias");

    // Footer
    try page.setLineWidth(0.5);
    page.setStrokeColor(pdf.Color.light_gray);
    try page.drawLine(50, 80, 545, 80);

    try page.setFont(.helvetica, 8);
    page.setFillColor(pdf.Color.gray);
    try page.drawText(50, 65, "Esta factura ha sido generada electronicamente y es valida sin firma.");
    try page.drawText(50, 55, "ACME Corporation - Inscrita en el Registro Mercantil de Madrid, Tomo 12345, Folio 67, Hoja M-123456");

    // Page number
    try page.drawText(500, 55, "Pagina 1/1");

    // Save
    const filename = "invoice.pdf";
    try doc.saveToFile(filename);

    std.debug.print("Created: {s}\n", .{filename});
    std.debug.print("Done!\n", .{});
}