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PDF Oxide

Grafik, Muster und Shadings

PDF Oxide stellt Low-Level-Grafikprimitive bereit: ContentStreamBuilder für Pfade und Formen, TilingPatternBuilder für sich wiederholende Muster, Verlaufs-Builder für lineare und radiale Gradienten sowie ExtGStateBuilder für Transparenz und Mischmodi.

Binding-Abdeckung. Die FluentPageBuilder-Primitive rect(x, y, w, h), filled_rect(x, y, w, h, color) und line(x1, y1, x2, y2) gibt es seit v0.3.38 in Rust, Python, Node, C#, Go und WASM — siehe DocumentBuilder → Grafik-Primitive. Die vollständige ContentStreamBuilder-Oberfläche auf dieser Seite (beliebige Pfade, Bézier-Kurven, Farbräume, TilingPatternBuilder, LinearGradientBuilder / RadialGradientBuilder, ExtGStateBuilder) bleibt Rust-exklusiv. Andere Sprachen ketten die einfachen Primitive über DocumentBuilder, erzeugen PDFs über Pdf::from_html_css / Pdf::from_markdown / Pdf::from_images oder rufen für eigene Zeichnungen die Rust-CLI auf.

Schnellbeispiel

Rust

use pdf_oxide::writer::{ContentStreamBuilder, LineCap, LineJoin};

let mut builder = ContentStreamBuilder::new();
builder
    .save_state()
    .set_stroke_color(0.0, 0.0, 1.0)    // Blue stroke
    .set_fill_color(0.8, 0.8, 1.0)      // Light blue fill
    .set_line_width(2.0)
    .rect(72.0, 600.0, 200.0, 100.0)
    .fill_and_stroke()
    .restore_state();

ContentStreamBuilder – Zeichenprimitiven

ContentStreamBuilder generates PDF content stream operators for rendering graphics on a page.

Pfadoperationen

use pdf_oxide::writer::ContentStreamBuilder;

let mut cs = ContentStreamBuilder::new();

// Move/Line/Curve
cs.move_to(72.0, 700.0)
  .line_to(200.0, 700.0)
  .line_to(200.0, 600.0)
  .close_path()
  .stroke();

// Rectangle
cs.rect(72.0, 500.0, 150.0, 80.0)
  .fill();

// Bezier curve
cs.move_to(72.0, 400.0)
  .curve_to(100.0, 450.0, 200.0, 350.0, 250.0, 400.0)
  .stroke();

Farboperationen

// RGB colors (0.0 to 1.0)
cs.set_fill_color(1.0, 0.0, 0.0);      // Red fill
cs.set_stroke_color(0.0, 0.5, 0.0);    // Green stroke

// Grayscale
cs.set_fill_color_gray(0.5);           // 50% gray fill
cs.set_stroke_color_gray(0.0);         // Black stroke

// CMYK
cs.set_fill_color_cmyk(0.0, 1.0, 1.0, 0.0);    // Red in CMYK
cs.set_stroke_color_cmyk(1.0, 0.0, 0.0, 0.0);  // Cyan stroke

Linienstil

use pdf_oxide::writer::{ContentStreamBuilder, LineCap, LineJoin};

let mut cs = ContentStreamBuilder::new();

cs.set_line_width(2.0)
  .set_line_cap(LineCap::Round)
  .set_line_join(LineJoin::Round)
  .set_miter_limit(10.0)
  .set_dash_pattern(vec![5.0, 3.0], 0.0);  // 5pt dash, 3pt gap

LineCap variants: Butt (default), Round, Square

LineJoin variants: Miter (default), Round, Bevel

Grafikzustand

// Save/restore state for isolated operations
cs.save_state()
  .set_fill_color(1.0, 0.0, 0.0)
  .rect(100.0, 100.0, 50.0, 50.0)
  .fill()
  .restore_state();
// State is restored to what it was before save_state()

Path Filling and Stroking

Method Description
.stroke() Stroke the path outline
.fill() Fill the path interior (non-zero winding)
.fill_even_odd() Fill using even-odd rule
.fill_and_stroke() Fill and stroke
.fill_and_stroke_even_odd() Fill (even-odd) and stroke
.close_and_stroke() Close path then stroke
.close_fill_and_stroke() Close, fill, and stroke
.end_path() End path without painting

Clipping

// Clip to rectangle, then draw inside
cs.save_state()
  .rect(100.0, 100.0, 200.0, 200.0)
  .clip()
  .end_path()
  // Everything drawn here is clipped to the rectangle
  .set_fill_color(1.0, 0.0, 0.0)
  .rect(50.0, 50.0, 300.0, 300.0)  // Only visible within clip
  .fill()
  .restore_state();

Transformations

// Apply transformation matrix [a b c d e f]
cs.save_state()
  .transform(1.0, 0.0, 0.0, 1.0, 100.0, 200.0)  // Translate
  .rect(0.0, 0.0, 50.0, 50.0)
  .fill()
  .restore_state();

InhaltStreamOp Enum

Für maximale Kontrolle erstellen Sie Operationen direkt:

use pdf_oxide::writer::ContentStreamOp;

let ops = vec![
    ContentStreamOp::SaveState,
    ContentStreamOp::SetLineWidth(2.0),
    ContentStreamOp::SetStrokeColorRGB(0.0, 0.0, 1.0),
    ContentStreamOp::MoveTo(72.0, 500.0),
    ContentStreamOp::LineTo(300.0, 500.0),
    ContentStreamOp::Stroke,
    ContentStreamOp::RestoreState,
];

TilingPatternBuilder – Repeating Patterns

Kachelmuster wiederholen eine kleine Zelle über einen Bereich.

use pdf_oxide::writer::{TilingPatternBuilder, PatternPaintType, PatternTilingType};

// Striped pattern
let (pattern_dict, content_bytes) = TilingPatternBuilder::new()
    .bbox(0.0, 0.0, 10.0, 10.0)
    .x_step(10.0)
    .y_step(10.0)
    .colored()
    .tiling_type(PatternTilingType::ConstantSpacing)
    .content_bytes(b"0.8 0 0 rg 0 0 5 10 re f".to_vec())
    .build();

Konfigurationsmethoden

Method Description
.bbox(x, y, w, h) Set bounding box of pattern cell
.x_step(step) Horizontal spacing between cells
.y_step(step) Vertical spacing between cells
.step(x, y) Set both steps at once
.colored() Colors defined in pattern content
.uncolored() Color specified when pattern is used
.tiling_type(type) Set tiling algorithm
.matrix(a, b, c, d, e, f) Apply transformation to pattern
.content_bytes(bytes) Set raw content stream bytes
.build() Returns (Object, Vec<u8>)

PatternPresets

PDF Oxide includes preset patterns for common use cases:

use pdf_oxide::writer::PatternPresets;

// Access presets for common patterns like hatching, dots, etc.

LinearGradientBuilder – Linear Gradients

Erstellen Sie axiale (lineare) Verlaufsschattierungen.

use pdf_oxide::writer::{LinearGradientBuilder, GradientStop};
use pdf_oxide::layout::Color;

let (shading_dict, function_dict) = LinearGradientBuilder::new()
    .from(0.0, 0.0)
    .to(468.0, 0.0)
    .add_stop(0.0, Color { r: 1.0, g: 0.0, b: 0.0 })   // Red
    .add_stop(0.5, Color { r: 1.0, g: 1.0, b: 0.0 })   // Yellow
    .add_stop(1.0, Color { r: 0.0, g: 0.0, b: 1.0 })   // Blue
    .extend(true)
    .build();

Two-Color Shortcut

use pdf_oxide::writer::LinearGradientBuilder;
use pdf_oxide::layout::Color;

let gradient = LinearGradientBuilder::two_color(
    Color { r: 0.0, g: 0.0, b: 0.5 },  // Dark blue
    Color { r: 0.5, g: 0.8, b: 1.0 },   // Light blue
);

Konfigurationsmethoden

Method Description
.from(x, y) Start point of gradient
.to(x, y) End point of gradient
.add_stop(pos, color) Add color stop (position 0.0-1.0)
.extend_start(bool) Extend gradient before start point
.extend_end(bool) Extend gradient after end point
.extend(bool) Set both extend flags

RadialGradientBuilder – Radial Gradients

Erstellen Sie kreisförmige Verlaufsschattierungen.

use pdf_oxide::writer::RadialGradientBuilder;
use pdf_oxide::layout::Color;

let (shading_dict, function_dict) = RadialGradientBuilder::new()
    .center(200.0, 400.0)
    .radius(0.0, 150.0)  // Inner radius 0, outer radius 150
    .add_stop(0.0, Color { r: 1.0, g: 1.0, b: 1.0 })  // White center
    .add_stop(1.0, Color { r: 0.0, g: 0.0, b: 0.5 })  // Dark blue edge
    .build();

ExtGStateBuilder – Transparency & Blend Modes

Steuern Sie Transparenz, Mischmodi und andere Grafikzustands-Parameter.

use pdf_oxide::writer::{ExtGStateBuilder, BlendMode};

let gs_dict = ExtGStateBuilder::new()
    .fill_alpha(0.5)             // 50% transparent fill
    .stroke_alpha(0.8)           // 80% opaque stroke
    .blend_mode(BlendMode::Multiply)
    .build();

Konfigurationsmethoden

Method Description
.fill_alpha(a) Fill opacity (0.0 transparent, 1.0 opaque)
.stroke_alpha(a) Stroke opacity
.blend_mode(mode) Set blend mode
.line_width(w) Override line width
.line_cap(cap) Override line cap style
.line_join(join) Override line join style
.miter_limit(limit) Override miter limit
.flatness(f) Flatness tolerance
.overprint_stroke(b) Overprint mode for stroke
.overprint_fill(b) Overprint mode for fill

BlendMode Variants

Normal, Multiply, Screen, Overlay, Darken, Lighten, ColorDodge, ColorBurn, HardLight, SoftLight

GradientPresets

Komfortmethoden für gängige Verlaufsmuster:

use pdf_oxide::writer::GradientPresets;

// Access preset gradient configurations

Erweitertes Beispiel

Drawing a Chart Background with Gradient

use pdf_oxide::writer::{
    ContentStreamBuilder, LinearGradientBuilder, ExtGStateBuilder, BlendMode,
};
use pdf_oxide::layout::Color;

let mut cs = ContentStreamBuilder::new();

// Draw chart area with rounded-corner appearance
cs.save_state()
  .set_fill_color(0.95, 0.95, 0.97)
  .rect(72.0, 200.0, 468.0, 400.0)
  .fill()
  .restore_state();

// Draw grid lines
cs.save_state()
  .set_stroke_color(0.85, 0.85, 0.85)
  .set_line_width(0.5);

for i in 0..5 {
    let y = 200.0 + (i as f32 * 100.0);
    cs.move_to(72.0, y).line_to(540.0, y).stroke();
}

cs.restore_state();

// Draw data bars
let values = [280.0, 350.0, 180.0, 420.0, 310.0];
let colors = [
    (0.2, 0.5, 0.8),
    (0.3, 0.7, 0.4),
    (0.8, 0.3, 0.3),
    (0.6, 0.4, 0.8),
    (0.9, 0.6, 0.2),
];

for (i, (&val, &(r, g, b))) in values.iter().zip(colors.iter()).enumerate() {
    let x = 100.0 + (i as f32 * 85.0);
    cs.save_state()
      .set_fill_color(r, g, b)
      .rect(x, 200.0, 50.0, val)
      .fill()
      .restore_state();
}

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