1、时钟（鄙人最得意的一个作品）
#includegraphics.h
#includemath.h
#includedos.h
#define pi 3.
#define X(a,b,c) x=a*cos(b*c*pi/180-pi/2)+300;
#define Y(a,b,c) y=a*sin(b*c*pi/180-pi/2)+240;
#define d(a,b,c,d) X(a,b,c);Y(a,b,c);Bline(300,240,x,y,d)
void plot_circle_points(int xc, int yc, int x, int y, int c)
{
putpixel(xc+x, yc+y, c);
putpixel(xc-x, yc+y, c);
putpixel(xc+x, yc-y, c);
putpixel(xc-x, yc-y, c);
putpixel(xc+y, yc+x, c);
putpixel(xc-y, yc+x, c);
putpixel(xc+y, yc-x, c);
putpixel(xc-y, yc-x, c);
}
void Bcircle (int xc, int yc, int radius, int c)
{
int x, y, p;
x=0;
y=radius;
p=3-2*radius;
while (xy){
plot_circle_points(xc, yc, x, y, c);
if (p0) p=p+4*x+6;
else{
p=p+4*(x-y)+10;
y-=1;
}
x+=1;
}
if (x == y)
plot_circle_points(xc, yc, x, y, c);
}
void Bline (int x1, int y1, int x2, int y2, int c)
{
int x, y, tmp;
int dx, dy, d;
float k;
if( 0 == (x1 - x2))
{
x = x1;
if(y1 y2)
{ tmp = y1;y1 = y2; y2 =tmp;}
for(y = y1; y y2; y ++)
{
putpixel(x, y, abs(getpixel(x,y)-c));
}
return;
}
k = (float)(y2 -y1)/(float)(x2 - x1);
if(k 1.0)
{
tmp = x1; x1 = y1; y1 = tmp;
tmp = x2; x2 = y2; y2 = tmp;
}
else if(k 0)
{}
else if(k -1.0)
{
x1 = -x1;
x2 = -x2;
tmp = x1; x1 = y1; y1 = tmp;
tmp = x2; x2 = y2; y2 = tmp;
}
else if( k 0)
{
y1 = - y1;
y2 = - y2;
}
else
{
y = y1;
if(x1 x2)
{ tmp = x1; x1 = x2; x2 = tmp;}
for(x = x1; x = x2; x ++)
{
putpixel(x, y, abs(getpixel(x,y)-c));
}
return;
}
if(x1 x2)
{
tmp = x1; x1 = x2; x2 = tmp;
tmp = y1; y1 = y2; y2 = tmp;
}
dx =
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