- 类DL_Extrusion
DL_Extrusion 是 DXF 库中的一个类,用于表示三维实体的扩展信息。在 DXF 文件中,DL_Extrusion 类通常用于表示具有高度的三维图形实体,如立方体、圆柱体等,以及其它具有体积的几何对象。
以下是一个简单的示例代码,展示了如何使用 DL_Extrusion 类来创建一个简单的三维实体并将其写入 DXF 文件:
#include <iostream>
#include "dl_creationadapter.h"
#include "dl_dxf.h"
#include "dl_writerascii.h"class MyExtrusion : public DL_CreationAdapter {
public:void addExtrusion() {DL_ExtrusionData data;data.basePoint.set(0.0, 0.0, 0.0);data.axis.set(0.0, 0.0, 1.0);data.length = 10.0;data.angle = 0.0;data.radius = 2.0;addExtrusion(data);}void addExtrusion(const DL_ExtrusionData& data) {addExtrusion(data.basePoint.x, data.basePoint.y, data.basePoint.z,data.axis.x, data.axis.y, data.axis.z,data.length, data.angle, data.radius);}void addExtrusion(double x, double y, double z,double nx, double ny, double nz,double length, double angle, double radius) {DL_Extrusion extrusion(x, y, z, nx, ny, nz, length, angle, radius);addEntity(&extrusion);}
};int main() {DL_Dxf dxf;MyExtrusion creationAdapter;creationAdapter.addExtrusion();dxf.write("output.dxf", &creationAdapter);std::cout << "DXF 文件已生成。" << std::endl;return 0;
}
在上面的示例中,我们定义了一个名为 MyExtrusion
的类,继承自 DL_CreationAdapter
。在 addExtrusion
方法中,我们创建了一个 DL_ExtrusionData
对象,设置了基本点、轴向、长度、角度和半径等参数,并调用 addExtrusion
方法添加了一个 Extrusion 实体。然后在 main
函数中,我们创建了一个 DXF 对象,调用 write
方法将添加的实体写入 DXF 文件中。
请注意,以上示例仅用于演示目的,实际使用时需要根据您的需求和 DXF 库的具体接口进行调整。
方法setElevation
在 DXF 库中的 DL_Extrusion
类中,setElevation
方法通常用于设置或更改 Extrusion 实体的高度或海拔值。在三维空间中,高度通常表示对象在 z 轴上的位置,即垂直于 XY 平面的距离。通过调用 setElevation
方法,您可以指定 Extrusion 实体在 z 轴上的位置,从而改变其在三维空间中的位置。
以下是一个简单的伪代码示例,展示了如何使用 setElevation
方法来设置 Extrusion 实体的高度:
DL_Extrusion extrusion;
double elevation = 5.0; // 设置高度为 5.0extrusion.setElevation(elevation);
在上面的示例中,我们创建了一个名为 extrusion
的 DL_Extrusion
对象,并将高度值设置为 5.0,然后调用 setElevation
方法将这个高度值应用到 Extrusion 实体上。这样,实体的位置就会相应地在 z 轴上移动 5 个单位距禿
请注意,setElevation
方法的确切用法可能会根据您所使用的 DXF 库的 API 设计略有不同,具体取决于库的实现方式和参数设置。
- 老版库头文件实现
/****************************************************************************
** Copyright (C) 2001-2013 RibbonSoft, GmbH. All rights reserved.
**
** This file is part of the dxflib project.
**
** 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
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** Licensees holding valid dxflib Professional Edition licenses may use
** this file in accordance with the dxflib Commercial License
** Agreement provided with the Software.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** See http://www.ribbonsoft.com for further details.
**
** Contact info@ribbonsoft.com if any conditions of this licensing are
** not clear to you.
**
**********************************************************************/#ifndef DL_EXTRUSION_H
#define DL_EXTRUSION_H#include "dl_global.h"#include <math.h>/*** Extrusion direction.** @author Andrew Mustun*/
class DXFLIB_EXPORT DL_Extrusion
{
public:/*** Default constructor.*/DL_Extrusion(){direction = new double[3];setDirection( 0.0, 0.0, 1.0 );setElevation( 0.0 );}/*** Destructor.*/~DL_Extrusion(){delete[] direction;}/*** Constructor for DXF extrusion.** @param direction Vector of axis along which the entity shall be extruded* this is also the Z axis of the Entity coordinate system* @param elevation Distance of the entities XY plane from the origin of the* world coordinate system*/DL_Extrusion( double adx, double ady, double adz, double aelevation ){direction = new double[3];setDirection( adx, ady, adz );setElevation( aelevation );}/*** Sets the direction vector.*/void setDirection( double dx, double dy, double dz ){direction[0] = dx;direction[1] = dy;direction[2] = dz;}/*** @return direction vector.*/double* getDirection() const{return direction;}/*** @return direction vector.*/void getDirection( double dir[] ) const{dir[0] = direction[0];dir[1] = direction[1];dir[2] = direction[2];}/*** Sets the elevation.*/void setElevation( double aelevation ){this->elevation = aelevation;}/*** @return Elevation.*/double getElevation() const{return elevation;}/*** Copies extrusion (deep copies) from another extrusion object.*/DL_Extrusion operator =( const DL_Extrusion& extru ){setDirection( extru.direction[0], extru.direction[1], extru.direction[2] );setElevation( extru.elevation );return *this;}private:double* direction;double elevation;
};#endif