voidCTestViewGetMaxX得到客戶區(qū)的最大橫坐標(biāo)

voidCTestView::GetMaxX()// 得到客戶區(qū)的最大橫坐標(biāo){CRectRect;GetClientRect(&Rect);MaxX=Rect.right;}voidCTestView::GetMaxY()// 得到客戶區(qū)最大縱坐標(biāo){CRectRect;GetClientRect(&Rect);MaxY=Rect.bottom;}//Bresenham算法畫圓//voidCTestView::RoundBre(intR){CClientDCdc(this);//圓心(MaxX/2,MaxY/2),當(dāng)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;//圓心距差值平方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;//

起點(diǎn)(0,R)yi=R;dd=2-2*R;//起點(diǎn)的右下像素 (1,R-1)的圓心距差值 dd=1+(R-1)*(R-1)-R*Rdc.SetPixel(MaxX/2,MaxY/2,RGB(0,255,0));// 畫圓心while(yi>=xi)//

循環(huán)到八分之一圓

;yi>=0

即可以畫出四分圓{dc.SetPixel(xi+MaxX/2,yi+MaxY/2,RGB(0,255,0));

//2

區(qū),坐標(biāo)平移(MaxX/2, MaxY/2)畫圓dc.SetPixel(yi+MaxX/2,xi+MaxY/2,RGB(0,255,0));

//1

區(qū)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

區(qū)區(qū)區(qū)區(qū)區(qū)區(qū)if(dd<0)//D在圓內(nèi);H在圓上或圓外;選擇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 時(shí)取右點(diǎn){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在圓外;V在圓外或圓上 ;選擇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 時(shí)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 在圓上,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()// 菜單函數(shù){TODO:AddyourcommandhandlercodehereInputDlgdlg;if(dlg.DoModal()==IDOK)r=dlg.m_