#include??
#include??
#include??
#include??
#include??

int?round（double?x）
{
	double?t=x-int（x）;;
	if（t<0.5）?return?int（x）;
	if（t>0.5）?return?int（x）+1;
	if（t==0.5&&int（x）%2==0）?return?int（x）;
	if（t==0.5&&int（x）%2!=0）?return?int（x）+1;
}
void?Swap（double?xdouble?y）
{
	double?t;
	t=x;
????x=y;
????y=t;
}
int?Sign（double?x）{
	if?（x>0）return?1;
	if?（x<0）return?-1;
	if?（x==0）return?0;
}
void?CirclePoints（HDC?hdcint?xint?yint?xsint?ys）{???//利用八方對稱性畫圓上的點

	if?（x+xs==0）{?
	SetPixel（hdcx+xsy+ysRGB（100100100））;
	SetPixel（hdcx+xs-y+ysRGB（100100100））;
	SetPixel（hdc-y+xsx+ysRGB（100100100））;??
	SetPixel（hdcy+xsx+ysRGB（100100100））;
	}
	if（y+ys==0）{
	SetPixel（hdcx+xsy+ysRGB（100100100））;
	SetPixel（hdc-x+xsy+ysRGB（100100100））;
	SetPixel（hdcy+xs-x+ysRGB（100100100））;?????
	SetPixel（hdcy+xsx+ysRGB（100100100））;
	}
	if（x+xs==y+ys）{
	SetPixel（hdcx+xsy+ysRGB（100100100））;
	SetPixel（hdc-x+xsy+ysRGB（100100100））;
	SetPixel（hdc-x+xs-y+ysRGB（100100100））;
	SetPixel（hdcx+xs-y+ysRGB（100100100））;
	}
	if（x+xs==-y+ys）{
	SetPixel（hdcx+xsy+ysRGB（100100100））;
	SetPixel（hdc-x+xsy+ysRGB（100100100））;
	SetPixel（hdc-x+xs-y+ysRGB（100100100））;
	SetPixel（hdcx+xs-y+ysRGB（100100100））;
	}
else
	{
	SetPixel（hdcx+xsy+ysRGB（100100100））;
	SetPixel（hdc-x+xsy+ysRGB（100100100））;
	SetPixel（hdc-x+xs-y+ysRGB（100100100））;
	SetPixel（hdcx+xs-y+ysRGB（100100100））;
	SetPixel（hdc-y+xsx+ysRGB（100100100））;
	SetPixel（hdc-y+xs-x+ysRGB（100100100））;?????
	SetPixel（hdcy+xs-x+ysRGB（100100100））;?????
	SetPixel（hdcy+xsx+ysRGB（100100100））;
	}
}

void?EllipsePoints（HDC?hdcint?xint?yint?xsint?ys）{???//利用橢圓的四方對稱性畫橢圓上的點

	SetPixel（hdcx+xsy+ysRGB（100100100））;
	SetPixel（hdc-x+xsy+ysRGB（100100100））;
	SetPixel（hdc-x+xs-y+ysRGB（100100100））;
	SetPixel（hdcx+xs-y+ysRGB（100100100））;

}

void?DDALine（HDC?hdcdouble?xsdouble?ysdouble?xedouble?ye）//DDALine
{
???double?x;
???double?y;

???if（xs>xe）????????//確定左右端點?
???{??	double?t;
	t=xs;
????xs=xe;
????xe=t;

????t=ys;
????ys=ye;
????ye=t;
???}


//垂直X軸

???if（xs==xe）{?

??????x=round（xs）;
	??y=round（ys）;
???for（;y<=ye;y++）{
		SetPixel（hdcxyRGB（100100100））;

???}
???}
//平行X軸

???if（ys==ye）{?

??????x=round（xs）;
	??y=round（ys）;
???for（;x<=xe;x++）{
		SetPixel（hdcxyRGB（100100100））;

???}
???}
???if（xs!=xe&&ys!=ye）{

?????double?dx=xe-xs;
?????double?dy=ye-ys;
?????double?k=dy/dx;

???//|k|<=1
if（k!=0&&k<=1&&k>=-1）{
???x=round（x）;
???
???for（x=xsy=ys;x<=xe;x++）{
		SetPixel（hdcxround（y）RGB（100100100））;
????????y+=k;
???}
???}
???//|k|>1
???if（k>1||k<-1）{
???if（ys>ye）????????//確定左右端點?
???{??	double?t;
	t=xs;
????xs=xe;
????xe=t;
????
????t=ys;
????ys=ye;
????ye=t;

???}
	???y=round（ys）;
	???k=dx/dy;
	???for（x=xsy=ys;y<=ye;y++）{
		SetPixel（hd

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

?????文件???????7790??2009-04-15?23:04??graph.cpp

?????文件?????208984??2009-04-15?23:04??program.exe

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

???????????????216774????????????????????2