void arc(double x, double y, double x0, double y0, double x1, double y1) /* draw arc with center x,y */
{
move(x0, y0);
hvflush();
printf("\\D'a%.3fi %.3fi %.3fi %.3fi'\n",
xsc(x-x0), -ysc(y-y0), xsc(x1-x), -ysc(y1-y)); /* WATCH SIGNS */
flyback();
}
point(xi,yi){
struct {char pad,c; int x,y;} p;
p.c = 2;
p.x = xnow = xsc(xi);
p.y = ynow = ysc(yi);
write(vti,&p.c,5);
}
void circle(double x, double y, double r)
{
move(x-r, y);
hvflush();
printf("\\D'c%.3fi'\n", xsc(2 * r));
flyback();
}
void
point(int xi, int yi)
{
if(xsc(xi)!=currentx || ysc(yi)!=currenty)
move(xi,yi);
printf("V[]");
}
void
point(int xi, int yi)
{
if(xsc(xi)!=currentx || ysc(yi)!=currenty)
move(xi,yi);
buffready(1);
putchar('d');
}
void ellipse(double x, double y, double r1, double r2)
{
double ir1, ir2;
move(x-r1, y);
hvflush();
ir1 = xsc(r1);
ir2 = ysc(r2);
printf("\\D'e%.3fi %.3fi'\n", 2 * ir1, 2 * fabs(ir2));
flyback();
}
void spline(double x, double y, double n, ofloat *p, int dashed __unused, double ddval __unused)
{
int i;
double dx, dy;
double xerr, yerr;
move(x, y);
hvflush();
xerr = yerr = 0.0;
printf("\\D'~");
for (i = 0; i < 2 * n; i += 2) {
dx = xsc(xerr += p[i]);
xerr -= dx/xscale;
dy = ysc(yerr += p[i+1]);
yerr -= dy/yscale;
printf(" %.3fi %.3fi", dx, -dy); /* WATCH SIGN */
}
printf("'\n");
flyback();
}
move(xi,yi){
movep(xconv(xsc(xi)),yconv(ysc(yi)));
return;
}
void
cont(int x0, int y0)
{
iline(xnow,ynow,xconv(xsc(x0)),yconv(ysc(y0)));
return;
}
void
line(int x0, int y0, int x1, int y1)
{
iline(xconv(xsc(x0)),yconv(ysc(y0)),xconv(xsc(x1)),yconv(ysc(y1)));
return;
}
cont(x0,y0){
iline(xnow,ynow,xconv(xsc(x0)),yconv(ysc(y0)));
return;
}
line(x0,y0,x1,y1){
iline(xconv(xsc(x0)),yconv(ysc(y0)),xconv(xsc(x1)),yconv(ysc(y1)));
return;
}
