void display(void)
{
int i,ix,iy, ix1,iy1;
double t;
glClear(GL_COLOR_BUFFER_BIT);
for( i=0; i<16; i++ ){
t = (float)i*22.5*3.1415926545867932/180.;
ix = (int)(300.*cos(t)) + width/2;
iy = (int)(300.*sin(t)) + height/2;
//if(8<=i && i<=12)
linei( width/2, height/2, ix, iy ); // 中心から放射状に16方向に直線を引く
}
circlei( width/2,width/2,width/2 ); // ウィンドウ幅の直径の円を描く
glFlush();
}
void display(void)
{
int i,ix,iy, ix1,iy1;
double a=1.995128, y0=0., y2, x1=0.069756;
double b=1.989043, x0=0., x2, y1=0.104528;
double mag;
glClear(GL_COLOR_BUFFER_BIT);
mag = width/3;
ix = width/2; iy = height/2;
for( i=0; i<180; i++ ){
ix1 = (int)(x1*mag) + width/2;
iy1 = (int)(y1*mag) + height/2;
linei( ix,iy,ix1,iy1 );
x2 = a*x1-x0; x0 = x1; x1 = x2;ix = ix1;
y2 = b*y1-y0; y0 = y1; y1 = y2;iy = iy1;
}
circlei( ix,iy,iy/4 );
glFlush();
}
