DL_Attributes 通常是 DXF 库中用于存储图形实体属性的类。在 DXF 文件中，每个图形实体都可以具有一系列属性，如颜色、线型、线宽等。DL_Attributes 类用于封装和管理这些属性，以便在创建、编辑和显示图形实体时使用。
以下是一个简单的伪代码示例，展示了如何使用 DL_Attributes 类来设置和获取图形实体的属性：
DL_Attributes attributes;// 设置属性值
attributes.setColor(DL_Codes::black); // 设置颜色为黑色
attributes.setLineWidth(0.5); // 设置线宽为0.5// 获取属性值
int color = attributes.getColor(); // 获取颜色值
double lineWidth = attributes.getLineWidth(); // 获取线宽值
在上面的示例中，我们创建了一个 DL_Attributes 对象 attributes，并使用该对象的方法来设置和获取图形实体的属性。通过调用 setColor 和 setLineWidth 方法，我们设置了图形实体的颜色和线宽属性，然后通过 getColor 和 getLineWidth 方法获取这些属性的值。
DL_Attributes 类的具体方法和属性可能会根据您所使用的 DXF 库的实现有所不同，具体取决于库的设计和功能。通常，您可以在 DXF 库的文档或源代码中找到关于 DL_Attributes 类的详细信息，包括其方法、属性和用法示例。
老版源码：
/****************************************************************************
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**
** This file is part of the dxflib project.
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** This file is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
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** (at your option) any later version.
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** Licensees holding valid dxflib Professional Edition licenses may use
** this file in accordance with the dxflib Commercial License
** Agreement provided with the Software.
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** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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** See http://www.ribbonsoft.com for further details.
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** Contact info@ribbonsoft.com if any conditions of this licensing are
** not clear to you.
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**********************************************************************/#ifndef DL_ATTRIBUTES_H
#define DL_ATTRIBUTES_H#include "dl_global.h"#include <string>
#include <vector>#include "dl_codes.h"/*** Storing and passing around attributes. Attributes* are the layer name, color, width and line type.** @author Andrew Mustun*/
class DXFLIB_EXPORT DL_Attributes
{
public:/*** Default constructor.*/DL_Attributes() :layer( "" ),color( 0 ),color24( -1 ),width( 0 ),linetype( "BYLAYER" ),linetypeScale( 1.0 ),handle( -1 ),inPaperSpace( false ){}/*** Constructor for DXF attributes.** @param layer Layer name for this entity or NULL for no layer* (every entity should be on a named layer!).* @param color Color number (0..256). 0 = BYBLOCK, 256 = BYLAYER.* @param width Line thickness. Defaults to zero. -1 = BYLAYER,* -2 = BYBLOCK, -3 = default width* @param linetype Line type name or "BYLAYER" or "BYBLOCK". Defaults* to "BYLAYER"*/DL_Attributes( const std::string& alayer,int acolor, int awidth,const std::string& alinetype,double alinetypeScale ) :layer( alayer ), color( acolor ), color24( -1 ), width( awidth ),linetype( alinetype ), linetypeScale( alinetypeScale ),handle( -1 ), inPaperSpace( false ){}/*** Constructor for DXF attributes.** @param layer Layer name for this entity or NULL for no layer* (every entity should be on a named layer!).* @param color Color number (0..256). 0 = BYBLOCK, 256 = BYLAYER.* @param color24 24 bit color (0x00RRGGBB, see DXF reference).* @param width Line thickness. Defaults to zero. -1 = BYLAYER,* -2 = BYBLOCK, -3 = default width* @param linetype Line type name or "BYLAYER" or "BYBLOCK". Defaults* to "BYLAYER"*/DL_Attributes( const std::string& alayer,int acolor, int acolor24, int awidth,const std::string& alinetype, int ahandle = -1 ) :layer( alayer ),color( acolor ), color24( acolor24 ),width( awidth ), linetype( alinetype ), linetypeScale( 1.0 ),handle( ahandle ),inPaperSpace( false ){}/*** Sets the layer. If the given pointer points to NULL, the* new layer name will be an empty but valid string.*/void setLayer( const std::string& alayer ){layer = alayer;}/*** @return Layer name.*/std::string getLayer() const{return layer;}/*** Sets the color.** @see DL_Codes, dxfColors*/void setColor( int acolor ){color = acolor;}/*** Sets the 24bit color.** @see DL_Codes, dxfColors*/void setColor24( int acolor ){color24 = acolor;}/*** @return Color.** @see DL_Codes, dxfColors*/int getColor() const{return color;}/*** @return 24 bit color or -1 if no 24bit color is defined.** @see DL_Codes, dxfColors*/int getColor24() const{return color24;}/*** Sets the width.*/void setWidth( int awidth ){width = awidth;}/*** @return Width.*/int getWidth() const{return width;}/*** Sets the line type. This can be any string and is not* checked to be a valid line type.*/void setLinetype( const std::string& alinetype ){linetype = alinetype;}/*** Sets the entity specific line type scale.*/void setLinetypeScale( double alinetypeScale ){linetypeScale = alinetypeScale;}double getLinetypeScale() const{return linetypeScale;}/*** @return Line type.*/std::string getLinetype() const{if( linetype.length()==0 ){return "BYLAYER";}else{return linetype;}}void setHandle( int h ){handle = h;}int getHandle() const{return handle;}void setInPaperSpace( bool on ){inPaperSpace = on;}bool isInPaperSpace() const{return inPaperSpace;}private:std::string layer;int color;int color24;int width;std::string linetype;double linetypeScale;int handle;// DXF code 67 (true: entity in paper space, false: entity in model space (default):bool inPaperSpace;
};#endif// EOF
)
