%%改進的bresenham畫圓方法，給定半徑，畫圓
%bresenham_improving（r）
%初始值
r=input（‘r=‘）;

x=0;y=r;c=[xy];
p=2*r-3;px=-6;py=4*r-4;

while（x????if（p>=0）
????????x=x+1;y=y;
????????p=p+px;
????????px=px-4;
????????c=[c;xy];
????else
????????x=x+1;y=y-1;
????????p=p+px+py;
????????px=px-4;
????????py=py-4;
????????c=[c;xy];
????end
????
end
cs=size（c1）;
ct=[];c1=[];
if?（c（cs2）==0）
????ct=[];
elseif（c（cs1）>=c（cs2））
????ct=c（1:cs-1:）;
else
????ct=c;
end
cts=size（ct1）;
for?i=1:cts
????c1（i1）=c（cts-i+12）;
????c1（i2）=c（cts-i+11）;
end

cw=[c;c1];
as=size（cw1）;
if（cw（as2）==0）
????b_sec=zeros（as-22）;d_for=zeros（as-22）;
????for?m=1:as-2
????b_sec（m1）=-cw（as-m1）;?b_sec（m2）=cw（as-m2）;
????d_for（m1）=cw（as-m1）;??d_for（m2）=-cw（as-m2）;
????end
else
????b_sec=zeros（as-12）;d_for=zeros（as-12）;
????for?n=1:as-2
????b_sec（n1）=-cw（as-n1）;?b_sec（n2）=cw（as-n2）;
????d_for（n1）=cw（as-n1）;??d_for（n2）=-cw（as-n2）;
????end
end
????c_th=zeros（as2）;
????mr=[];
????
????c_th（:1）=-cw（:1）;??c_th（:2）=-cw（:2）;
???
????mr=[cw;d_for;c_th;b_sec];?
????plot（mr（:1）mr（:2））;hold?on;
????y11=[];
????y22=[];
????x1=[];
????for?x=0:0.1:r
????????x1=[x1;x];
????????y1=sqrt（r^2-x^2）;y11=[y11;y1];
????????y2=-sqrt（r^2-x^2）;y22=[y22;y2];
????end
????plot（x1y11‘r‘）;hold?on;
????plot（-x1y11‘r‘）;hold?on;
????plot（x1y22‘r‘）;hold?on;
????plot（-x1y22‘r‘）;hold?on;
????
????

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件?????191034??2009-11-02?14:36??畫圓\3種畫圓算法的優劣分析.pdf

?????文件???????1462??2010-01-06?18:09??畫圓\bresenham_circle_improving.m

?????文件??????46080??2009-11-05?11:12??畫圓\bresenham畫圓思想.doc

?????文件?????164519??2009-11-09?10:49??畫圓\Bresenham畫圓算法的改進.pdf

?????文件?????501342??2009-11-05?10:02??畫圓\計算機圖形學-編程?-?docin_com豆丁網.mht

?????目錄??????????0??2010-03-24?10:05??畫圓

-----------?---------??----------?-----??----

???????????????904437????????????????????6