程序的实现步骤 2.2 4.在文档类中添加重画直线和重写文本的函数 void CDocView Doc DrawLine(CDC *pDC CLine *pLine POSITION pos m LineList. GetHeadPositiono for( pos = NULL; m LineList GetNext(pos)) pLine =(CLine *)m Line List. GetAt(pos) pLine->Draw(pDC)程序的实现步骤 2.2 void CDocViewDoc::DrawLine(CDC *pDC) { CLine *pLine; POSITION pos = m_LineList.GetHeadPosition(); for(; pos != NULL; m_LineList.GetNext(pos)) { pLine = (CLine *) m_LineList.GetAt(pos); pLine->Draw(pDC); } } 4. 在文档类中添加重画直线和重写文本的函数