用pdfclown提取矢量图形（线条和点） [英] Extracting vector graphics (lines and points) with pdfclown

问题描述

我想用pdfclown从pdf中提取矢量图形（线条和点）。我试图围绕图形样本包裹头部，但我无法弄清楚这个对象模型是如何工作的。请问任何人都可以解释关系吗？

你是对的：直到PDF Clown 0.1系列，高级路径建模没有实现（它将从 ContentScanner派生。 GraphicsWrapper ）。

下一个版本（ 0.2 series ，下个月到期）将通过新的 支持所有图形内容的高级表示，包括路径对象（PathElement） //pdfclown.org/2014/09/12/waiting-for-pdf-clown-0-2-0-release/#ContentModellerrel =nofollow> ContentModeller 。这是一个例子：

  import org.pdfclown.documents.contents.elements.ContentModeller; 
 import org.pdfclown.documents.contents.elements.GraphicsElement; 
 import org.pdfclown.documents.contents.elements.PathElement; 
 import org.pdfclown.documents.contents.objects.Path; 
 
 import java.awt.geom.GeneralPath; （GraphicsElement<>元素：ContentModeller.model（page，Path.class））
 
）
 {
 PathElement pathElement =（PathElement）element; 
列表< ContentMarker> markers = pathElement.getMarkers（）; 
 pathElement.getBox（）; 
 GeneralPath getPath = pathElement.getPath（）; 
 pathElement.isFilled（）; 
 pathElement.isStroked（）; 
} 
  

与此同时，您可以提取矢量图形的低级表示通过 ContentScanner 迭代内容流为在ContentScanningSample中提供（在可下载发行版中提供），查找与路径相关的操作（ BeginSubpath ， DrawLine ， DrawRectangle ， DrawCurve ，...）。

I want to extract vector graphics (lines and points) out of a pdf with pdfclown. I have tried to wrap my head around the graphics sample but i cannot figure out how the object model works for this. Please can anyone explain the relationships?

解决方案

You are right: till PDF Clown 0.1 series, high-level path modelling was not implemented (it would have been derived from ContentScanner.GraphicsWrapper).

Next release (0.2 series, due next month) will support the high-level representation of all the graphics contents, including path objects (PathElement), through the new ContentModeller. Here is an example:

import org.pdfclown.documents.contents.elements.ContentModeller;
import org.pdfclown.documents.contents.elements.GraphicsElement;
import org.pdfclown.documents.contents.elements.PathElement;
import org.pdfclown.documents.contents.objects.Path;

import java.awt.geom.GeneralPath;

for(GraphicsElement<?> element : ContentModeller.model(page, Path.class))
{
  PathElement pathElement = (PathElement)element;
  List<ContentMarker> markers = pathElement.getMarkers();
  pathElement.getBox();
  GeneralPath getPath = pathElement.getPath();
  pathElement.isFilled();
  pathElement.isStroked();
}

In the meantime, you can extract the low-level representation of the vector graphics iterating the content stream through ContentScanner as suggested in ContentScanningSample (available in the downloadable distribution), looking for path-related operations (BeginSubpath, DrawLine, DrawRectangle, DrawCurve, ...).

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