textview.cpp

bresenham算法的MFC,希望大家顶一下啊

// TextView.cpp : implementation of the CTextView class
//

#include "stdafx.h"
#include "Text.h"

#include "TextDoc.h"
#include "TextView.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CTextView

IMPLEMENT_DYNCREATE(CTextView, CView)

BEGIN_MESSAGE_MAP(CTextView, CView)
	//{{AFX_MSG_MAP(CTextView)
	ON_COMMAND(ID_MENUBRESENHAM, OnMenubresenham)
	//}}AFX_MSG_MAP
	// Standard printing commands
	ON_COMMAND(ID_FILE_PRINT, CView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_DIRECT, CView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_PREVIEW, CView::OnFilePrintPreview)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CTextView construction/destruction

CTextView::CTextView()
{
	// TODO: add construction code here

}

CTextView::~CTextView()
{
}

BOOL CTextView::PreCreateWindow(CREATESTRUCT& cs)
{
	// TODO: Modify the Window class or styles here by modifying
	//  the CREATESTRUCT cs

	return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CTextView drawing

void CTextView::OnDraw(CDC* pDC)
{
	CTextDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here
}

/////////////////////////////////////////////////////////////////////////////
// CTextView printing

BOOL CTextView::OnPreparePrinting(CPrintInfo* pInfo)
{
	// default preparation
	return DoPreparePrinting(pInfo);
}

void CTextView::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add extra initialization before printing
}

void CTextView::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add cleanup after printing
}

/////////////////////////////////////////////////////////////////////////////
// CTextView diagnostics

#ifdef _DEBUG
void CTextView::AssertValid() const
{
	CView::AssertValid();
}

void CTextView::Dump(CDumpContext& dc) const
{
	CView::Dump(dc);
}

CTextDoc* CTextView::GetDocument() // non-debug version is inline
{
	ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CTextDoc)));
	return (CTextDoc*)m_pDocument;
}
#endif //_DEBUG

/////////////////////////////////////////////////////////////////////////////
// CTextView message handlers

void CTextView::Bresenham()   //Bresenham直线
{
	CDC *pDC;
	pDC=GetDC();
	int c=RGB(CR,CG,CB);	        
    int x,y,dx,dy,dk;
    dx=x2-x1;
    dy=y2-y1;
    dk=2*dy-dx; 
    if(x1!=x2)
	{
		int k=dy/dx;
        if(y1==y2)
		{
			if(x1<x2) //水平从左至右
			{
				y=y1;
				for(x=x1;x<=x2;x++)
				{
					pDC->SetPixel(x,y,c);
				}
			}
			else;  //水平从右至左
			{
				y=y1;
                for(x=x1;x>=x2;x--)
				{
					pDC->SetPixel(x,y,c);
				}
			}
		}
        else if(abs(k)<1)
		{
			if(x1<x2&&y1<y2)    //一区域
			{
				y=y1;
                for(x=x1;x<=x2;x++)
				{
					pDC->SetPixel(x,y,c);
                    dk=dk+2*dy;
                    if(dk>=0)
					{
						y++;
                        dk=dk-2*dx;
					}
				}
			}
            if(x1>x2&&y1<y2)//四区域
			{
				y=y1;
                for(x=x1;x>=x2;x--)
				{
					pDC->SetPixel(x,y,c);
                    dk=dk+2*dy;
                    if(dk>=0)
					{
						y++;
                        dk=dk-2*dx;
					}
				}
			}
			if(x1>x2&&y1>y2)    //五区域
			{
				y=y1;
				for(x=x1;x>=x2;x--)
				{
					pDC->SetPixel(x,y,c);
					dk=dk-2*dx;
					if(dk>=0)
					{
						y--;
						dk=dk-2*dy;
					}
				}
			}
			if(x1<x2&&y1>y2)      //八区域
			{
				y=y1;
				for(x=x1;x<=x2;x++)
				{
					pDC->SetPixel(x,y,c);
					dk=dk-2*dk;
					if(dk>=0)
					{
						y--;
						dk=dk-2*dy;
					}
				}
			}
		}
		else
		{
			x=x1;
			if(x1<x2&&y1<y2) //二区域
			{
				for(y=y1;y<=y2;y++)
				{
					pDC->SetPixel(x,y,c);
                    dk=dk+2*dx;
                    if(dk>=0)
					{
						x++;
                        dk=dk-2*dy;
					}
				}
			}
			if(x1>x2&&y1<y2)     //三区域
			{
				for(y=y1;y<=y2;y++)
				{
					pDC->SetPixel(x,y,c);
                    dk=dk-2*dx;
                    if(dk>=0)
					{
						x--;
						dk=dk+2*dy;
					}
				}
			}
			if(x1>x2&&y1>y2) //六区域
			{
				for(y=y1;y>=y2;y--)
				{
					pDC->SetPixel(x,y,c);
                    dk=dk-2*dx;
                    if(dk>=0)
					{
						x--;
						dk=dk+2*dy;
					}
				}
			}
			if(x1<x2&&y1>y2)          //七区域
			{
				for(y=y1;y>=y2;y--)
				{
					pDC->SetPixel(x,y,c);
					dk=dk-2*dy;
					if(dk>=0)
					{
						x++;
						dk=dk+2*dx;
					}
				}
			}
		}
		 }
		 else if(x1==x2)
		 {
			 if(y1<y2)             //垂直从上到下画
			 {
				 x=x1;
				 for(y=y1;y<=y2;y++)
				 {
					  pDC->SetPixel(x,y,c);
				 }
			 }
			 else                    //垂直从下往上画
			 {
				 x=x1;
				 for(y=y1;y>=y2;y--)
				 {
					 pDC->SetPixel(x,y,c);
				 }
			 }
		 }
		 ReleaseDC(pDC);
}



void CTextView::OnMenubresenham() 
{
	// TODO: Add your command handler code here
	InputDlg dlg;
	if(dlg.DoModal()==IDOK)
	{
		x1=dlg.m_x1;
		y1=dlg.m_y1;
		x2=dlg.m_x2;
		y2=dlg.m_y2;
		CR=dlg.m_CR;
		CG=dlg.m_CG;
		CB=dlg.m_CB;
	}
	Bresenham();
}