分形几何

开发平台：

Visual C++

drawtree.cpp：源码内容

							#include "drawtree.h"
#include<math.h>
BOOL CMyApp::InitInstance()
{
	this->m_pMainWnd=new CMainWnd();
    m_pMainWnd->ShowWindow(m_nCmdShow);
	m_pMainWnd->UpdateWindow();
	return true;
}
CMyApp theapp;
int CMainWnd::OnCreate(LPCREATESTRUCT cs)
{
	if(CFrameWnd::OnCreate(cs)==-1)
		return -1;
	sqt=sqrt((dt_x*dt_x+dt_y*dt_y)/2);
    return 0;
}
CMainWnd::CMainWnd()
{
	Create(NULL,_T("DrawTree"));
	srand(time(NULL));//初始化随机种子
}
BEGIN_MESSAGE_MAP(CMainWnd,CFrameWnd)
   ON_WM_CREATE()
   ON_WM_PAINT()
END_MESSAGE_MAP()
void CMainWnd::OnPaint()
{  
	AfxGetMainWnd()->SetWindowText("分形树2010");
	count=0;
    CPaintDC dc(this);
	CRect rect;
	GetClientRect(&rect);
//起点所在的屏幕位置
    int pa=rect.Width()/2;
	int pb=rect.Height();
	drawtree(&dc,pa,pb,ang,len);//,wid
}
void CMainWnd::drawtree(CPaintDC* pdc,int px,int py,double ang,double l)//,short width
{
		
	double rn=rand()%10*(PI/180);//弧度值的偏差，若无则对称
	INT rn2=rand()%9;
	if(rn2>=5)  rn=-1*rn;
	
//	if(width<1) width=1;
   	
	int x=px+(int)(l*cos(ang));
	int y=py-(int)(l*sin(ang));
     pdc->MoveTo(px,py);
     pdc->LineTo(x,y);
   if(l<25)
	   return;
    drawtree(pdc,x,y,ang-arg+rn,l*sqt);//,width+2
    drawtree(pdc,x,y,ang+arg+rn,l*sqt);//,width+2
}

						