voidCTestViewGetMaxX得到客户区的最大横坐标

voidCTestView::GetMaxX()// 得到客户区的最大横坐标{CRectRect;GetClientRect(&Rect);MaxX=Rect.right;}voidCTestView::GetMaxY()// 得到客户区最大纵坐标{CRectRect;GetClientRect(&Rect);MaxY=Rect.bottom;}//Bresenham算法画圆//voidCTestView::RoundBre(intR){CClientDCdc(this);//圆心(MaxX/2,MaxY/2),当前像素I(xi,yi),右像素D(xi+1,y),右下像素DV(xi+1,yi-1),下像素V(xi,yi-1)intxi,yi,dd,m,n;//圆心距差值平方dh=(xi+1)*(xi+1)+yi*yi-R*R;dd=(xi+1)*(xi+1)+(yi-1)*(yi-1)-R*R;dv=xi*xi+(yi-1)*(yi-1)-R*R;xi=0;//

起点(0,R)yi=R;dd=2-2*R;//起点的右下像素 (1,R-1)的圆心距差值 dd=1+(R-1)*(R-1)-R*Rdc.SetPixel(MaxX/2,MaxY/2,RGB(0,255,0));// 画圆心while(yi>=xi)//

循环到八分之一圆

;yi>=0

即可以画出四分圆{dc.SetPixel(xi+MaxX/2,yi+MaxY/2,RGB(0,255,0));

//2

区,坐标平移(MaxX/2, MaxY/2)画圆dc.SetPixel(yi+MaxX/2,xi+MaxY/2,RGB(0,255,0));

//1

区dc.SetPixel(-xi+MaxX/2,yi+MaxY/2,RGB(0,255,0));//3dc.SetPixel(-yi+MaxX/2,xi+MaxY/2,RGB(0,255,0));//4dc.SetPixel(-yi+MaxX/2,-xi+MaxY/2,RGB(0,255,0));//5dc.SetPixel(-xi+MaxX/2,-yi+MaxY/2,RGB(0,255,0));//6dc.SetPixel(xi+MaxX/2,-yi+MaxY/2,RGB(0,255,0));//7dc.SetPixel(yi+MaxX/2,-xi+MaxY/2,RGB(0,255,0));//8

区区区区区区if(dd<0)//D在圆内;H在圆上或圆外;选择H或D,dh>=0,dd<0,m=|dh|-|dd|=2*(dd+yi)-1;{m=2*(dd+yi)-1;if(m<=0)//取右像素 H(xi+1,yi);m=0 时取右点{dd=dd+2*xi+3;//求H的右下像素(xi+2,yi-1),dd=(xi+2)*(xi+2)+(yi-1)*(yi-1)-R*Rxi=xi+1;}else//取右下像素 D(xi+1,yi-1){dd=dd+2*(xi-yi+3);// 求D的右下像素(xi+2,yi-2),dd=(xi+2)*(xi+2)+(yi-2)*(yi-2)-R*Rxi=xi+1;yi=yi-1;}}elseif(dd>0)//D在圆外;V在圆外或圆上 ;选择D或V;dd>0,dv<=0,n=|dd|-|dv|=2*(dd-xi)-1;{n=2*(dd-xi)-1;if(n<=0)//取右下像素 D(xi+1,yi-1);n=0 时取{dd=dd+2*(xi-yi+3);// 求D的右下像素(xi+2,yi-2),dd=(xi+2)*(xi+2)+(yi-2)*(yi-2)-R*Rxi=xi+1;yi=yi-1;}else//取下像素 V(xi,yi-1){dd=dd-2*yi+3;//求V的右下像素(xi+1,yi-2)dd=(xi+1)*(xi+1)+(yi-2)*(yi-2)-R*Ryi=yi-1;}}elseif(dd==0)//D 在圆上,取D(xi+1,yi-1){dd=dd+2*(xi-yi+3);// 求D的右下像素(xi+2,yi-2),dd=(xi+2)*(xi+2)+(yi-2)*(yi-2)-R*Rxi=xi+1;yi=yi-1;}}}voidCTestView::OnMENUMbellipse()// 菜单函数{TODO:AddyourcommandhandlercodehereInputDlgdlg;if(dlg.DoModal()==IDOK)r=dlg.m_