CAD二次开发中直线的绘制、颜色、图层、线型

Color.h

#pragma once class ModelSpace { public: //将实体添加到模型空间 static AcDbObjectId AddToModelSpace(AcDbEntity* pEnt); }; class CLine { public: //创建直线 static AcDbObjectId AddLine(const AcGePoint3d &ptStart, const AcGePoint3d &ptEnd); }; class Color { public: //改变对象颜色 static ErrorStatus ChangeColor(AcDbObjectId entId, Adesk::UInt16 colorIndex); }; class Layer { public: //改变对象图层 static void SetLayer(AcDbObjectId entId, const TCHAR* layerName); }; class LineType { public: //改变对象线型 static void SetLineType(AcDbObjectId entId, const TCHAR* linetype); }; class Demo { public: //加载、卸载和执行主函数 static void m_Init(); static void m_Unload(); static void m_Demo(); };

Color.cpp

#include "stdafx.h" #include "Color.h" #include <tchar.h> void Demo::m_Init() { acedRegCmds->addCommand(_T("g1"), _T("ChangeColor"), _T("测试"), ACRX_CMD_MODAL, Demo::m_Demo); } void Demo::m_Unload() { acedRegCmds->removeGroup(_T("g1")); } //将实体添加到模型空间 AcDbObjectId ModelSpace::AddToModelSpace(AcDbEntity* pEnt) { //检查输入参数的有效性 assert(pEnt); //获得当前图形数据库的块表 AcDbBlockTable* pBT1 = NULL; acdbHostApplicationServices()->workingDatabase()->getBlockTable(pBT1, AcDb::kForRead); //获得模型空间对应的块表记录 AcDbBlockTableRecord* pBT1Rcd = NULL; pBT1->getAt(ACDB_MODEL_SPACE, pBT1Rcd, AcDb::kForWrite); pBT1->close(); //将实体添加到模型空间的快表记录中 AcDbObjectId lineId; Acad::ErrorStatus es = pBT1Rcd->appendAcDbEntity(lineId, pEnt); if (es != Acad::eOk) { pBT1Rcd->close(); delete pEnt; //添加失败时delete pEnt = NULL; return AcDbObjectId::kNull; } //关闭模型空间块表记录 pBT1Rcd->close(); pEnt->close(); return lineId; } AcDbObjectId CLine::AddLine(const AcGePoint3d& ptStart, const AcGePoint3d& ptEnd) { //创建直线实体 AcDbLine* pLine = new AcDbLine(ptStart, ptEnd); //将直线实体添加到模型空间中 return ModelSpace::AddToModelSpace(pLine); } //修改颜色，范围0~256 Acad::ErrorStatus Color::ChangeColor(AcDbObjectId entId, Adesk::UInt16 colorIndex) { //检测参数的有效性 assert(colorIndex >= 0 && colorIndex <= 256); AcDbEntity* pEntity; acdbOpenAcDbEntity(pEntity, entId, AcDb::kForWrite); pEntity->setColorIndex(colorIndex); pEntity->close(); return Acad::eOk; } //修改图层 void Layer::SetLayer(AcDbObjectId entId, const TCHAR* layerName) { AcDbEntity* pEnt = NULL; if (acdbOpenObject(pEnt, entId, AcDb::kForWrite) == Acad::eOk) { pEnt->setLayer(layerName); pEnt->close(); } } //修改线型 void LineType::SetLineType(AcDbObjectId entId, const TCHAR* linetype) { AcDbEntity* pEnt = NULL; if (acdbOpenObject(pEnt, entId, AcDb::kForWrite) == Acad::eOk) { pEnt->setLinetype(linetype); pEnt->close(); } } void Demo::m_Demo() { //创建直线 AcGePoint3d ptStart(0, 0, 0); AcGePoint3d ptEnd(100, 100, 0); AcDbObjectId lineId = CLine::AddLine(ptStart, ptEnd); //修改颜色为红色 Color::ChangeColor(lineId, 2); //修改实体的图层 Layer::SetLayer(lineId, TEXT("中心线")); //修改实体的线型 LineType::SetLineType(lineId, TEXT("HIDDEN")); }

仅供学习使用，还有很多不完善的地方，比如没有对返回值进行检查，未做兜底