void DrawEyes(TPoint mouse)
{
var newpupil = new[] { new TPoint(), new TPoint() };
int num;
if (TPointEqual(mouse, eyes.Mouse))
{
if (delays[eyes.Update + 1] != 0)
{
++eyes.Update;
}
return;
}
ComputePupils(mouse, newpupil);
for (num = 0; num < 2; num++)
{
DrawEye(newpupil[num], num);
}
eyes.Mouse = mouse;
eyes.Update = 0;
}
bool TPointEqual(TPoint a, TPoint b) => (TEqual(a.X, b.X) && TEqual(a.Y, b.Y));
TPoint ComputePupil(int num, TPoint mouse, TRectangle screen)
{
double cx, cy;
double dist;
double angle;
double dx, dy;
double cosa, sina;
TPoint ret = new TPoint();
cx = EYE_X(num); dx = mouse.X - cx;
cy = EYE_Y(num); dy = mouse.Y - cy;
if (dx != 0 || dy != 0)
{
angle = Math.Atan2((double)dy, (double)dx);
cosa = Math.Cos(angle);
sina = Math.Sin(angle);
dist = BALL_DIST;
if (null != screen)
{
double x0, y0, x1, y1;
var a = new double[4];
x0 = screen.X - cx;
y0 = screen.Y - cy;
x1 = x0 + screen.Width;
y1 = y0 + screen.Height;
a[0] = Math.Atan2(y0, x0);
a[1] = Math.Atan2(y1, x0);
a[2] = Math.Atan2(y1, x1);
a[3] = Math.Atan2(y0, x1);
if (AngleBetween(angle, a[0], a[1]))
{
dist *= dx / x0;
}
else if (AngleBetween(angle, a[1], a[2]))
{
dist *= dy / y1;
}
else if (AngleBetween(angle, a[2], a[3]))
{
dist *= dx / x1;
}
else if (AngleBetween(angle, a[3], a[0]))
{
dist *= dy / y0;
}
if (dist > BALL_DIST)
{
dist = BALL_DIST;
}
}
if (dist > Math.Sqrt(Math.Pow(dx, 2.0) + Math.Pow(dy, 2.0)))
{
cx += dx;
cy += dy;
}
else
{
cx += dist * cosa;
cy += dist * sina;
}
}
ret.X = cx;
ret.Y = cy;
return(ret);
}