public void TimerEvent(QTimerEvent e)
{
// Don't move too far away
QLineF lineToCenter = new QLineF(new QPointF(0, 0), MapFromScene(0, 0));
if (lineToCenter.Length() > 150)
{
double angleToCenter = Math.Acos(lineToCenter.Dx() / lineToCenter.Length());
if (lineToCenter.Dy() < 0)
{
angleToCenter = TwoPi - angleToCenter;
}
angleToCenter = NormalizeAngle((Pi - angleToCenter) + Pi / 2);
if (angleToCenter < Pi && angleToCenter > Pi / 4)
{
// Rotate left
angle += (angle < -Pi / 2) ? 0.25 : -0.25;
}
else if (angleToCenter >= Pi && angleToCenter < (Pi + Pi / 2 + Pi / 4))
{
// Rotate right
angle += (angle < Pi / 2) ? 0.25 : -0.25;
}
}
else if (Math.Sin(angle) < 0)
{
angle += 0.25;
}
else if (Math.Sin(angle) > 0)
{
angle -= 0.25;
}
// Try not to crash with any other mice
List <QPointF> list = new List <QPointF>();
list.Add(MapToScene(0, 0));
list.Add(MapToScene(-30, -50));
list.Add(MapToScene(30, -50));
List <IQGraphicsItem> dangerMice = Scene().Items(new QPolygonF(list));
foreach (QGraphicsItem item in dangerMice)
{
if (item == this)
{
continue;
}
QLineF lineToMouse = new QLineF(new QPointF(0, 0), MapFromItem(item, 0, 0));
double angleToMouse = Math.Acos(lineToMouse.Dx() / lineToMouse.Length());
if (lineToMouse.Length() == 0)
{
angleToMouse = 0;
}
if (lineToMouse.Dy() < 0)
{
angleToMouse = TwoPi - angleToMouse;
}
angleToMouse = NormalizeAngle((Pi - angleToMouse) + Pi / 2);
if (angleToMouse >= 0 && angleToMouse < Pi / 2)
{
// Rotate right
angle += 0.5;
}
else if (angleToMouse <= TwoPi && angleToMouse > (TwoPi - Pi / 2))
{
// Rotate left
angle -= 0.5;
}
}
// Add some random movement
if (dangerMice.Count > 1 && (random.Next(10)) == 0)
{
if (random.Next(1) == 1)
{
angle += (random.Next(100)) / 500.0;
}
else
{
angle -= (random.Next(100)) / 500.0;
}
}
speed += (-50 + random.Next(100)) / 100.0;
double dx = Math.Sin(angle) * 10;
mouseEyeDirection = (Math.Abs(dx / 5) < 1) ? 0 : dx / 5;
Rotate(dx);
SetPos(MapToParent(0, -(3 + Math.Sin(speed) * 3)));
}
