利用dxflib读写cad文件-白红宇

利用dxflib读写cad文件

阅读量：5973 次

发布时间：2019-06-19

本文共 9956 字，大约阅读时间需要 33 分钟。

本篇主要在qt做一个例子读取cad文件数据，使用的开源库是。用到的DL_CreationAdapter，DL_Dxf。DL_Dxf是用来读取.dxf文件的类，DL_CreatinAdapter是一个容器，当DL_Dxf加载.dxf文件后，就会响应DL_CreationAdapter这个类，读取cad数据。

我们来看看他的工作原理：

//自己声明一个类继承DL_CreationAdapterclass MyDxfFilter : public DL_CreationAdapter {//重写虚函数来把度出来的数据保存到自己设计好的数据结构中 virtual void addLine(const DL_LineData& d); ...}void MyDxfFilter::addLine(const DL_LineData& d) { std::cout << "Line: " << d.x1 << "/" << d.y1 << " " << d.x2 << "/" << d.y2 << std::endl;}MyDxfFilter f;DL_Dxf dxf;//读取.dxf文件if (!dxf.in("drawing.dxf", &f)) { std::cerr << "drawing.dxf could not be opened.\n";}

在这段程序中，当dxf.in("drawing.dxf", &f)读取.dxf文件成功了，如果文件中有很多line，那么f对象会一直递归调用虚函数接口addLine()，直到所有的line都读完。

重这个特征，我们就可以把所有我们要读取的数据都出来了！

直接上程序！：

entitiesDatas.h

#ifndef ENTITIESDATAS_H#define ENTITIESDATAS_H#include 
    
     #include "dl_dxf.h"#include "dl_creationadapter.h"#include "dl_attributes.h"#include "dl_codes.h"#include "dl_entities.h"#include "dl_exception.h"#include "dl_global.h"#include "dl_writer.h"#include "dl_writer_ascii.h"#include 
     
      #include 
      
       class EntitiesDatas:public DL_CreationAdapter{public://    explicit EntitiesDatas();    virtual void EntitiesDatas::addPoint(const DL_PointData &d){        points.append(d);        qDebug()<<"^^^^^^^^^^^^^^^^^^^^^^^^^^^^add point";    }    virtual void EntitiesDatas::addLine(const DL_LineData &d){        lines.append(d);        qDebug()<<"~~~~~~~~~~~~~~~~~~~~~~~~~~add line";    }    virtual void EntitiesDatas::addArc(const DL_ArcData &d){        arcs.append(d);        qDebug()<<"#######################add arc";    }    virtual void EntitiesDatas::addCircle(const DL_CircleData &d){        circles.append(d);        qDebug()<<"!!!!!!!!!!!!!!!!!!!!!!!!add circle";    }    virtual void EntitiesDatas::addEllipse(const DL_EllipseData &d){        ellipses.append(d);        qDebug()<<"%%%%%%%%%%%%%%%%%%%%%%add ellipse";    }    virtual void EntitiesDatas::addText(const DL_TextData &d){        texts.append(d);        qDebug()<<"add text";    }    virtual void EntitiesDatas::addDimAngular(const DL_DimensionData &d, const DL_DimAngularData &d1){        qDebug()<<"***********add angular";    }//    virtual EntitiesDatas::addDimLinear(const DL_DimensionData &d, const DL_DimLinearData &d1){//        qDebug()<<"___________________________add deim linear";//    }    virtual void EntitiesDatas::addMText(const DL_MTextData &d){        mtexts.append(d);        qDebug()<<"&&&&&&&&&&add mtext";    }    virtual void EntitiesDatas::addXLine(const DL_XLineData &){        qDebug()<<"++++++++++++++add xline";    }    virtual void EntitiesDatas::addRay(const DL_RayData &){        qDebug()<<"/add ray";    }    virtual void EntitiesDatas::addPolyline(const DL_PolylineData &d){        qDebug()<<"eeeeeeeeeeeeeeeeeeeeeeeeeee add polyline";        polylines.append(d);    }    virtual void EntitiesDatas::addSpline(const DL_SplineData &){        qDebug()<<".....................................add spline data";    }    virtual void EntitiesDatas::addComment(const std::string &){        qDebug()<<",,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,add comment";    }    virtual void EntitiesDatas::addVertex(const DL_VertexData &d){        vertices.append(d);        qDebug()<<"hhhhhhhhhhhhhhhhhhhhhhhh add vertex";    }    virtual void EntitiesDatas::addLayer(const DL_LayerData &d){        qDebug()<<"ggggggggggggggggggg add layer";        qDebug()<
       
        >>>>>>>>>>>>>>>>>>>>>>>>>>>>add xdata string";    }    virtual void EntitiesDatas::addXRecord(const std::string &){        qDebug()<<",.,.,.,.,.,.,.,.,.,.,.,.,.,.,add repcord";    }    virtual void EntitiesDatas::addTrace(const DL_TraceData &){        qDebug()<<"mmmmmmmmmmmmmm add trace";    }    virtual void EntitiesDatas::endEntity(){        qDebug()<<"end entity***********************";        qDebug()<<"attribute           ***************** "<
        
         getAttributes().getColor();    }    virtual void EntitiesDatas::endSequence(){        qDebug()<<"end sequence +++++++++++++++++++++";    }    virtual void EntitiesDatas::setAttributes(const DL_Attributes &attrib){        qDebug()<<"set attribute ()()()()()()()()()()()()()()()";    }    virtual void EntitiesDatas::addHatch(const DL_HatchData &d){        qDebug()<<"nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn add hatch";        hatches.append(d);    }    virtual void EntitiesDatas::addHatchEdge(const DL_HatchEdgeData &d){        qDebug()<<"MMMMMMMMMMMMMMMMKMMMMM add hat edge data";        hatchedges.append(d);        if(this->getAttributes().getColor()==1){            QString color="#ef3312";            hatchcolors.append(color);        }        else if(this->getAttributes().getColor()==2){            QString color="#efef33";            hatchcolors.append(color);        }        else if(this->getAttributes().getColor()==3){            QString color="#12ef33";            hatchcolors.append(color);        }        else {            QString color="#efefef";            hatchcolors.append(color);        }    }//    virtual void EntitiesDatas::att    QList
         
           points; QList
          
            lines;// QList
           
             arcs; QList
            
              circles;// QList
             
               ellipses; QList
              
                texts; QList
               
                 dimangulars; QList
                
                  dimlines; QList
                 
                   radias; QList
                  
                    vertices;// QList
                   
                     polylines;// QList
                    
                      mtexts;// QList
                     
                       hatches;// QList
                      
                        hatchedges;// QList
                       
                         hatchcolors;};#endif // ENTITIESDATAS_H

dxfreader.h

#ifndef DXFREADER_H#define DXFREADER_H#include 
    
     #include "entitiesdatas.h"#include "dl_dxf.h"#include "dl_creationadapter.h"#include "dl_attributes.h"#include "dl_codes.h"#include "dl_entities.h"#include "dl_exception.h"#include "dl_global.h"#include "dl_writer.h"#include "dl_writer_ascii.h"#include 
     
      #include "entitiesdatas.h"#include 
      
       class DXFReader : public QObject{    Q_OBJECTpublic:    explicit DXFReader(QObject *parent = 0);    //line    Q_INVOKABLE int getLineLength();    Q_INVOKABLE double getLinex1(int index);    Q_INVOKABLE double getLinex2(int index);    Q_INVOKABLE double getLiney1(int index);    Q_INVOKABLE double getLiney2(int index);    //circle    Q_INVOKABLE int getCircleLength();    Q_INVOKABLE double getCirclex(int index);    Q_INVOKABLE double getCircley(int index);    Q_INVOKABLE double getCircleRadius(int index);    //mtext    Q_INVOKABLE int getMTextLength();    Q_INVOKABLE double getMTextx(int index);    Q_INVOKABLE double getMTexty(int index);    Q_INVOKABLE QString getMTextStr(int index);    Q_INVOKABLE double getMTextSize(int index);    //ploy line    Q_INVOKABLE int getPolyLineLength();    Q_INVOKABLE double getVertex1x(int index);    Q_INVOKABLE double getVertex2x(int index);    Q_INVOKABLE double getVertex3x(int index);    Q_INVOKABLE double getVertex4x(int index);    Q_INVOKABLE double getVertex1y(int index);    Q_INVOKABLE double getVertex2y(int index);    Q_INVOKABLE double getVertex3y(int index);    Q_INVOKABLE double getVertex4y(int index);    //hatch edge and hatch color    Q_INVOKABLE int getHatchLength();    Q_INVOKABLE QString getHatchColor(int index);    Q_INVOKABLE double getHatchx(int index);    Q_INVOKABLE double getHatchy(int index);    Q_INVOKABLE double getHatchRadius(int index);signals:public slots:private:    EntitiesDatas f;    DL_Dxf dxf;};#endif // DXFREADER_H

dxfreader.cpp

#include "dxfreader.h"#include "math.h"#include "QtMath"DXFReader::DXFReader(QObject *parent) : QObject(parent){    //初始化第一个dxf文件    if (!dxf.in("c:/aa.dxf", &f)) {     qDebug()<<"can not read datas";    }else {        qDebug()<<"success";    }}//lineint DXFReader::getLineLength(){    return f.lines.count();}double DXFReader::getLinex1(int index){    return f.lines.at(index).x1;}double DXFReader::getLinex2(int index){    return f.lines.at(index).x2;}double DXFReader::getLiney1(int index){    return f.lines.at(index).y1;}double DXFReader::getLiney2(int index){    return f.lines.at(index).y2;}//circleint DXFReader::getCircleLength(){    return f.circles.count();}double DXFReader::getCirclex(int index){    return f.circles.at(index).cx;}double DXFReader::getCircley(int index){    return f.circles.at(index).cy;}double DXFReader::getCircleRadius(int index){    return f.circles.at(index).radius;}//mtextint DXFReader::getMTextLength(){    return f.mtexts.count();}double DXFReader::getMTextx(int index){    return f.mtexts.at(index).ipx;}double DXFReader::getMTexty(int index){    return f.mtexts.at(index).ipy;}QString DXFReader::getMTextStr(int index){    return QString::fromStdString(f.mtexts.at(index).text);}double DXFReader::getMTextSize(int index){    return f.mtexts.at(index).height*3/4;}//ploy lineint DXFReader::getPolyLineLength(){    return f.polylines.count();}double DXFReader::getVertex1x(int index){    return f.vertices.at(index*4).x;}double DXFReader::getVertex2x(int index){    return f.vertices.at(index*4+1).x;}double DXFReader::getVertex3x(int index){    return f.vertices.at(index*4+2).x;}double DXFReader::getVertex4x(int index){    return f.vertices.at(index*4+3).x;}double DXFReader::getVertex1y(int index){    return f.vertices.at(index*4).y;}double DXFReader::getVertex2y(int index){    return f.vertices.at(index*4+1).y;}double DXFReader::getVertex3y(int index){    return f.vertices.at(index*4+2).y;}double DXFReader::getVertex4y(int index){    return f.vertices.at(index*4+3).y;}//hatch edge and hatch colorint DXFReader::getHatchLength(){    return f.hatchedges.count();}double DXFReader::getHatchx(int index){    return f.hatchedges.at(index).cx;}double DXFReader::getHatchy(int index){    return f.hatchedges.at(index).cy;}QString DXFReader::getHatchColor(int index){    return f.hatchcolors.at(index);}double DXFReader::getHatchRadius(int index){    return f.hatchedges.at(index).radius;}

上面程序我是设计成暴露给qml使用的数据，一边使用qml中的canvas来绘制cad数据

看看都出来的数据效果图:

到这里，这个实现方法有个缺点，就是使用了qml 中的canvas绘制数据，当把canvas进行缩放的时候，onpaint事件被响应，但是数据很多，所以缩放越大，消耗内存就越大，搞得有点卡顿，不过这方法的有点就是方便，省了很多时间。

关于dxflib的搭建，很简单，只需要在官网下载dxflib源码，用qt编译出dxflib.lib文件，然后用自己喜欢的方式放到指定目录，就可以使用了。

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