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PDF Oxide

页面操作

PDF Oxide 提供完整的页面级操作集：旋转、媒体框和裁剪框控制、边距裁剪、页面合并、提取、内容擦除和页面重排。

页面旋转

获取旋转角度

获取页面当前的旋转角度（0、90、180 或 270 度）。

from pdf_oxide import PdfDocument

doc = PdfDocument("input.pdf")
rotation = doc.page_rotation(0)
print(f"Page 0 is rotated {rotation} degrees")

use pdf_oxide::editor::DocumentEditor;

let mut editor = DocumentEditor::open("input.pdf")?;
let rotation = editor.get_page_rotation(0)?;
println!("Page 0 is rotated {} degrees", rotation);

设置旋转角度

设置特定页面的绝对旋转。

doc = PdfDocument("input.pdf")
doc.set_page_rotation(0, 90)   # Rotate page 0 to 90 degrees
doc.save("rotated.pdf")

import { WasmPdfDocument } from "pdf-oxide-wasm";

const doc = new WasmPdfDocument(bytes);
doc.setPageRotation(0, 90);
const output = doc.save();
doc.free();

let mut editor = DocumentEditor::open("input.pdf")?;
editor.set_page_rotation(0, 90)?;
editor.save("rotated.pdf")?;

增量旋转

在现有旋转基础上增加旋转量。

let mut editor = DocumentEditor::open("input.pdf")?;

// Rotate page 0 by an additional 90 degrees
editor.rotate_page_by(0, 90)?;

editor.save("rotated.pdf")?;

旋转所有页面

对文档中的每一页应用相同的旋转。

doc = PdfDocument("input.pdf")
doc.rotate_all_pages(180)
doc.save("flipped.pdf")

import { WasmPdfDocument } from "pdf-oxide-wasm";

const doc = new WasmPdfDocument(bytes);
doc.rotateAllPages(180);
const output = doc.save();
doc.free();

let mut editor = DocumentEditor::open("input.pdf")?;
editor.rotate_all_pages(180)?;
editor.save("flipped.pdf")?;

MediaBox 和 CropBox

MediaBox 定义完整的物理页面大小。CropBox 定义可见区域（显示和打印的区域）。

获取和设置 MediaBox

doc = PdfDocument("input.pdf")

# Get MediaBox: (llx, lly, urx, ury)
box = doc.page_media_box(0)
print(f"MediaBox: {box}")

# Set MediaBox to US Letter (612 x 792 points)
doc.set_page_media_box(0, 0, 0, 612, 792)
doc.save("output.pdf")

import { WasmPdfDocument } from "pdf-oxide-wasm";

const doc = new WasmPdfDocument(bytes);

// Get MediaBox: [llx, lly, urx, ury]
const mediaBox = doc.pageMediaBox(0);
console.log("MediaBox:", mediaBox);

// Set MediaBox to US Letter (612 x 792 points)
doc.setPageMediaBox(0, 0, 0, 612, 792);
const output = doc.save();
doc.free();

let mut editor = DocumentEditor::open("input.pdf")?;

// Get MediaBox as [llx, lly, urx, ury]
let media_box = editor.get_page_media_box(0)?;
println!("MediaBox: {:?}", media_box);

// Set MediaBox
editor.set_page_media_box(0, [0.0, 0.0, 612.0, 792.0])?;
editor.save("output.pdf")?;

获取和设置 CropBox

doc = PdfDocument("input.pdf")

# Get CropBox (returns None if not set)
crop = doc.page_crop_box(0)
print(f"CropBox: {crop}")

# Set CropBox to crop a 1-inch border (72 points = 1 inch)
doc.set_page_crop_box(0, 72, 72, 540, 720)
doc.save("cropped.pdf")

import { WasmPdfDocument } from "pdf-oxide-wasm";

const doc = new WasmPdfDocument(bytes);

// Get CropBox (null if not set)
const cropBox = doc.pageCropBox(0);
console.log("CropBox:", cropBox);

// Set CropBox to crop a 1-inch border (72 points = 1 inch)
doc.setPageCropBox(0, 72, 72, 540, 720);
const output = doc.save();
doc.free();

let mut editor = DocumentEditor::open("input.pdf")?;

// Get CropBox (None if not explicitly set)
let crop_box = editor.get_page_crop_box(0)?;
println!("CropBox: {:?}", crop_box);

// Set CropBox
editor.set_page_crop_box(0, [72.0, 72.0, 540.0, 720.0])?;
editor.save("cropped.pdf")?;

Crop Margins

一个便捷方法，在所有页面上将 CropBox 设置为从 MediaBox 内缩指定的边距。

doc = PdfDocument("input.pdf")

# Crop 0.5 inch (36pt) from all sides on every page
doc.crop_margins(36, 36, 36, 36)
doc.save("cropped.pdf")

import { WasmPdfDocument } from "pdf-oxide-wasm";

const doc = new WasmPdfDocument(bytes);

// Arguments: left, right, top, bottom (in points)
doc.cropMargins(36, 36, 36, 36);
const output = doc.save();
doc.free();

let mut editor = DocumentEditor::open("input.pdf")?;

// Arguments: left, right, top, bottom (in points)
editor.crop_margins(36.0, 36.0, 36.0, 36.0)?;
editor.save("cropped.pdf")?;

合并 PDF

从另一个 PDF 合并所有页面

将另一个 PDF 的所有页面追加到当前文档末尾。

use pdf_oxide::editor::DocumentEditor;

let mut editor = DocumentEditor::open("main.pdf")?;
let pages_added = editor.merge_from("appendix.pdf")?;
println!("Added {} pages", pages_added);
editor.save("combined.pdf")?;

合并特定页面

从源 PDF 中选择特定页面进行追加。

let mut editor = DocumentEditor::open("main.pdf")?;

// Merge only pages 0, 2, and 4 from the source
editor.merge_pages_from("source.pdf", &[0, 2, 4])?;
editor.save("selected.pdf")?;

提取页面

将页面子集提取为新的 PDF 文件。

from pdf_oxide import PdfDocument

doc = PdfDocument("document.pdf")

# Extract specific pages to a new file
doc.extract_pages([0, 2, 4], "selected_pages.pdf")

const doc = new WasmPdfDocument(bytes);

// Extract pages to new PDF
const extracted = doc.extractPages([0, 2, 4]);
// extracted is Uint8Array of new PDF

doc.free();

use pdf_oxide::editor::DocumentEditor;

let mut editor = DocumentEditor::open("book.pdf")?;

// Extract pages 0-4 (first 5 pages) to a new file
editor.extract_pages(&[0, 1, 2, 3, 4], "chapter1.pdf")?;

内容擦除

擦除（涂白）页面上的矩形区域。这会在指定区域上绘制白色矩形，视觉上隐藏下方的内容。

擦除单个区域

doc = PdfDocument("input.pdf")

# Erase a region: (page, llx, lly, urx, ury)
doc.erase_region(0, 72, 700, 300, 792)
doc.save("erased.pdf")

import { WasmPdfDocument } from "pdf-oxide-wasm";

const doc = new WasmPdfDocument(bytes);

// Erase a region: (pageIndex, llx, lly, urx, ury)
doc.eraseRegion(0, 72, 700, 300, 792);
const output = doc.save();
doc.free();

let mut editor = DocumentEditor::open("input.pdf")?;
editor.erase_region(0, [72.0, 700.0, 300.0, 792.0])?;
editor.save("erased.pdf")?;

擦除多个区域

doc = PdfDocument("input.pdf")
doc.erase_regions(0, [
    (72, 700, 300, 792),
    (72, 600, 300, 650),
])
doc.save("erased.pdf")

import { WasmPdfDocument } from "pdf-oxide-wasm";

const doc = new WasmPdfDocument(bytes);

// Pass regions as a flat Float32Array: [llx, lly, urx, ury, ...]
const regions = new Float32Array([
  72, 700, 300, 792,
  72, 600, 300, 650,
]);
doc.eraseRegions(0, regions);
const output = doc.save();
doc.free();

let mut editor = DocumentEditor::open("input.pdf")?;
editor.erase_regions(0, &[
    [72.0, 700.0, 300.0, 792.0],
    [72.0, 600.0, 300.0, 650.0],
])?;
editor.save("erased.pdf")?;

清除待处理的擦除

在保存之前移除页面上所有待处理的擦除操作。

doc.clear_erase_regions(0)

editor.clear_erase_regions(0);

页面重排和操作

EditableDocument trait 提供页面操作方法。

移除页面

doc = PdfDocument("document.pdf")
doc.delete_page(3)
doc.save("modified.pdf")

const doc = new WasmPdfDocument(bytes);
doc.deletePage(3);
const saved = doc.save();
doc.free();

use pdf_oxide::editor::{DocumentEditor, EditableDocument};

let mut editor = DocumentEditor::open("input.pdf")?;
editor.remove_page(2)?;  // Remove page at index 2
editor.save("output.pdf")?;

移动页面

doc = PdfDocument("document.pdf")
doc.move_page(5, 1)  # Move page from position 5 to position 1
doc.save("reordered.pdf")

let mut editor = DocumentEditor::open("input.pdf")?;
editor.move_page(0, 3)?;  // Move page 0 to position 3
editor.save("reordered.pdf")?;

复制页面

let mut editor = DocumentEditor::open("input.pdf")?;
let new_index = editor.duplicate_page(0)?;  // Duplicate page 0
println!("Duplicate is at index {}", new_index);
editor.save("output.pdf")?;

完整 API 参考

旋转

方法 返回值 描述
get_page_rotation(index) Result<i32> 获取旋转角度
set_page_rotation(index, degrees) Result<()> 设置绝对旋转
rotate_page_by(index, degrees) Result<()> 添加增量旋转
rotate_all_pages(degrees) Result<()> 旋转每个页面

页面框

方法 返回值 描述
get_page_media_box(index) Result<[f32; 4]> 获取 MediaBox
set_page_media_box(index, box) Result<()> 设置 MediaBox
get_page_crop_box(index) Result<Option<[f32; 4]>> 获取 CropBox
set_page_crop_box(index, box) Result<()> 设置 CropBox
crop_margins(left, right, top, bottom) Result<()> 按边距裁剪所有页面

合并与提取

方法 返回值 描述
merge_from(path) Result<usize> 从另一个 PDF 合并所有页面
merge_pages_from(path, pages) Result<usize> 合并特定页面
extract_pages(pages, output) Result<()> 提取页面到新文件

内容擦除

方法 返回值 描述
erase_region(page, rect) Result<()> 擦除一个区域
erase_regions(page, rects) Result<()> 擦除多个区域
clear_erase_regions(page) () 清除待处理的擦除

页面管理（EditableDocument）

方法 返回值 描述
page_count() Result<usize> 页数
get_page_info(index) Result<PageInfo> 页面尺寸 and rotation
remove_page(index) Result<()> 移除页面
move_page(from, to) Result<()> 重新排列页面
duplicate_page(index) Result<usize> 复制页面

高级示例：规范化扫描页面

use pdf_oxide::editor::{DocumentEditor, EditableDocument};

let mut editor = DocumentEditor::open("scanned.pdf")?;
let count = editor.current_page_count();

for i in 0..count {
    // Set all pages to portrait Letter size
    editor.set_page_media_box(i, [0.0, 0.0, 612.0, 792.0])?;

    // Reset any rotation
    editor.set_page_rotation(i, 0)?;

    // Apply uniform margins
    editor.set_page_crop_box(i, [36.0, 36.0, 576.0, 756.0])?;
}

editor.save("normalized.pdf")?;

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