Basics

package main

import (
    "github.com/gpdf-dev/gpdf/document"
    "github.com/gpdf-dev/gpdf/template"
)

func main() {
    doc := template.New(
        template.WithPageSize(document.A4),
        template.WithMargins(document.UniformEdges(document.Mm(20))),
    )

    page := doc.AddPage()
    page.AutoRow(func(r *template.RowBuilder) {
        r.Col(12, func(c *template.ColBuilder) {
            c.Text("Hello, World!", template.FontSize(24), template.Bold())
        })
    })

    doc.RenderToFile("hello_world.pdf")
}

doc := template.New(
    template.WithPageSize(document.A4),
    template.WithMargins(document.UniformEdges(document.Mm(20))),
)

page := doc.AddPage()

// Title
page.AutoRow(func(r *template.RowBuilder) {
    r.Col(12, func(c *template.ColBuilder) {
        c.Text("Text Styling Examples", template.FontSize(20), template.Bold())
        c.Spacer(document.Mm(5))
    })
})

// Font sizes
page.AutoRow(func(r *template.RowBuilder) {
    r.Col(12, func(c *template.ColBuilder) {
        c.Text("Font Size 8pt", template.FontSize(8))
        c.Text("Font Size 12pt (default)", template.FontSize(12))
        c.Text("Font Size 18pt", template.FontSize(18))
        c.Text("Font Size 24pt", template.FontSize(24))
        c.Text("Font Size 36pt", template.FontSize(36))
        c.Spacer(document.Mm(5))
    })
})

// Font weight and style
page.AutoRow(func(r *template.RowBuilder) {
    r.Col(12, func(c *template.ColBuilder) {
        c.Text("Normal text")
        c.Text("Bold text", template.Bold())
        c.Text("Italic text", template.Italic())
        c.Text("Bold + Italic text", template.Bold(), template.Italic())
        c.Spacer(document.Mm(5))
    })
})

// Text colors
page.AutoRow(func(r *template.RowBuilder) {
    r.Col(12, func(c *template.ColBuilder) {
        c.Text("Red text", template.TextColor(pdf.Red))
        c.Text("Green text", template.TextColor(pdf.Green))
        c.Text("Blue text", template.TextColor(pdf.Blue))
        c.Text("Custom color (orange)", template.TextColor(pdf.RGB(1.0, 0.5, 0.0)))
        c.Text("Hex color (#336699)", template.TextColor(pdf.RGBHex(0x336699)))
        c.Spacer(document.Mm(5))
    })
})

// Background colors
page.AutoRow(func(r *template.RowBuilder) {
    r.Col(12, func(c *template.ColBuilder) {
        c.Text("Yellow background", template.BgColor(pdf.Yellow))
        c.Text("Cyan background", template.BgColor(pdf.Cyan))
        c.Text("White text on dark background",
            template.TextColor(pdf.White),
            template.BgColor(pdf.RGBHex(0x333333)),
        )
        c.Spacer(document.Mm(5))
    })
})

// Text alignment
page.AutoRow(func(r *template.RowBuilder) {
    r.Col(12, func(c *template.ColBuilder) {
        c.Text("Left aligned (default)", template.AlignLeft())
        c.Text("Center aligned", template.AlignCenter())
        c.Text("Right aligned", template.AlignRight())
    })
})

doc := template.New(
    template.WithPageSize(document.A4),
    template.WithMargins(document.UniformEdges(document.Mm(20))),
)

page := doc.AddPage()

page.AutoRow(func(r *template.RowBuilder) {
    r.Col(12, func(c *template.ColBuilder) {
        c.Text("Color System Examples", template.FontSize(18), template.Bold())
        c.Spacer(document.Mm(5))
    })
})

// Predefined colors
page.AutoRow(func(r *template.RowBuilder) {
    r.Col(12, func(c *template.ColBuilder) {
        c.Text("Predefined Colors:", template.Bold())
        c.Text("Red", template.TextColor(pdf.Red))
        c.Text("Green", template.TextColor(pdf.Green))
        c.Text("Blue", template.TextColor(pdf.Blue))
        c.Text("Yellow", template.TextColor(pdf.Yellow))
        c.Text("Cyan", template.TextColor(pdf.Cyan))
        c.Text("Magenta", template.TextColor(pdf.Magenta))
        c.Spacer(document.Mm(5))
    })
})

// RGB colors (0.0-1.0)
page.AutoRow(func(r *template.RowBuilder) {
    r.Col(12, func(c *template.ColBuilder) {
        c.Text("RGB Colors (float):", template.Bold())
        c.Text("RGB(1.0, 0.5, 0.0) - Orange", template.TextColor(pdf.RGB(1.0, 0.5, 0.0)))
        c.Text("RGB(0.5, 0.0, 0.5) - Purple", template.TextColor(pdf.RGB(0.5, 0.0, 0.5)))
        c.Text("RGB(0.0, 0.5, 0.5) - Teal", template.TextColor(pdf.RGB(0.0, 0.5, 0.5)))
        c.Spacer(document.Mm(5))
    })
})

// Hex colors
page.AutoRow(func(r *template.RowBuilder) {
    r.Col(12, func(c *template.ColBuilder) {
        c.Text("Hex Colors:", template.Bold())
        c.Text("#FF6B6B - Coral", template.TextColor(pdf.RGBHex(0xFF6B6B)))
        c.Text("#4ECDC4 - Turquoise", template.TextColor(pdf.RGBHex(0x4ECDC4)))
        c.Text("#45B7D1 - Sky Blue", template.TextColor(pdf.RGBHex(0x45B7D1)))
        c.Text("#96CEB4 - Sage", template.TextColor(pdf.RGBHex(0x96CEB4)))
        c.Spacer(document.Mm(5))
    })
})

// Grayscale
page.AutoRow(func(r *template.RowBuilder) {
    r.Col(12, func(c *template.ColBuilder) {
        c.Text("Grayscale:", template.Bold())
        c.Text("Gray(0.0) - Black", template.TextColor(pdf.Gray(0.0)))
        c.Text("Gray(0.3) - Dark gray", template.TextColor(pdf.Gray(0.3)))
        c.Text("Gray(0.5) - Medium gray", template.TextColor(pdf.Gray(0.5)))
        c.Text("Gray(0.7) - Light gray", template.TextColor(pdf.Gray(0.7)))
        c.Spacer(document.Mm(5))
    })
})

// Background color swatches
page.AutoRow(func(r *template.RowBuilder) {
    r.Col(12, func(c *template.ColBuilder) {
        c.Text("Background Color Swatches:", template.Bold())
    })
})

page.AutoRow(func(r *template.RowBuilder) {
    r.Col(3, func(c *template.ColBuilder) {
        c.Text(" Red ", template.TextColor(pdf.White), template.BgColor(pdf.Red))
    })
    r.Col(3, func(c *template.ColBuilder) {
        c.Text(" Green ", template.TextColor(pdf.White), template.BgColor(pdf.Green))
    })
    r.Col(3, func(c *template.ColBuilder) {
        c.Text(" Blue ", template.TextColor(pdf.White), template.BgColor(pdf.Blue))
    })
    r.Col(3, func(c *template.ColBuilder) {
        c.Text(" Yellow ", template.BgColor(pdf.Yellow))
    })
})