public double RotateWithMouse(GraphicsDevice graphicsDevice)
{
SphereVector unitPosition = new SphereVector(position.Normalized());
SphereVector up2 = unitPosition.WalkNorth(Math.PI / 2);
SphereVector right2 = new SphereVector(up2.Cross(unitPosition).Normalized());
double screenSpaceRotation = Math.Atan2(-forward.Dot(up2), forward.Dot(right2)); // we want up to be 0 and a positive rotation to be cw
Point mousePos = Mouse.GetState().Position;
Vector2d mouseV = new Vector2d((mousePos.X / (double)graphicsDevice.Viewport.Width - 0.5) * graphicsDevice.Viewport.AspectRatio, mousePos.Y / (double)graphicsDevice.Viewport.Height - 0.5);
double mouseRotation = Math.Atan2(mouseV.Y, mouseV.X);
double diff1 = (mouseRotation + 4 * Math.PI - screenSpaceRotation) % (2 * Math.PI);
double diff2 = (screenSpaceRotation + 4 * Math.PI - mouseRotation) % (2 * Math.PI);
double rotationSpeed;
if (diff1 < diff2)
{
return(diff1 / 10);
}
else
{
return(-diff2 / 10);
}
}
private void MoveShip1(GraphicsDevice graphicsDevice)
{
double rotationAccel = 0;
double accel = AccelWithKeys();
Keyboard.GetState().AffectNumber(ref rotationAccel, Keys.Left, Keys.Right, Keys.A, Keys.D, 0.01);
rotationSpeed = Math.Max(Math.Min(rotationSpeed + rotationAccel, 0.1), -0.1);
rotationSpeed *= 0.9;
// apply rotation
SphereVector right = new SphereVector(forward.Cross(position).Normalized());
forward = forward.WalkTowards(right, rotationSpeed);
// move forwards
velocity += forward * accel * Math.Pow(0.5, zoom) * 20;
position = new SphereVector((position + velocity).Normalized());
// flatten our forward/velocity against current position
forward = new SphereVector(forward.Cross(position).Cross(-position).Normalized());
if (velocity.Length() > 0.0000000001)
{
double currentSpeed = velocity.Length();
//if (rotationSpeed != 0) currentSpeed *= velocity.Normalized().Dot(forward);
double max = Math.Pow(0.5, zoom) * 0.2;
double min = Math.Pow(0.5, zoom) * 0;
currentSpeed = Math.Max(Math.Min(currentSpeed, max), min);
velocity = (velocity.Cross(position).Cross(-position).Normalized() * 0.8 + forward * 0.2).Normalized() * currentSpeed;
}
else
{
velocity = velocity.Cross(position).Cross(-position);
}
// now update altitude
ControlZoomWithKeys();
SphereVector unitPosition2 = new SphereVector(position.Normalized());
camera.cameraRotX = unitPosition2.ToLongLat().X;
camera.cameraRotY = unitPosition2.ToLongLat().Y;
camera.UpdateCamera(graphicsDevice);
}
// have the mouse control everything
private void MoveShip2(GraphicsDevice graphicsDevice)
{
double accel = AccelerateWithMouse(graphicsDevice);
//double accel = AccelWithKeys();
rotationSpeed = RotateWithMouse(graphicsDevice);
SphereVector right = new SphereVector(forward.Cross(position).Normalized());
forward = forward.WalkTowards(right, rotationSpeed);
// move forwards
velocity += forward * accel * Math.Pow(0.5, zoom) * 20;
position = new SphereVector((position + velocity).Normalized());
// flatten our forward/velocity against current position
forward = new SphereVector(forward.Cross(position).Cross(-position).Normalized());
if (velocity.Length() > 0.0000000001)
{
double currentSpeed = velocity.Length();
//if (rotationSpeed != 0) currentSpeed *= velocity.Normalized().Dot(forward);
double max = Math.Pow(0.5, zoom) * 0.2;
double min = Math.Pow(0.5, zoom) * 0;
currentSpeed = Math.Max(Math.Min(currentSpeed, max), min);
velocity = (velocity.Cross(position).Cross(-position).Normalized() * 0.8 + forward * 0.2).Normalized() * currentSpeed;
}
else
{
velocity = velocity.Cross(position).Cross(-position);
}
// now update altitude
SphereVector unitPosition2 = new SphereVector(position.Normalized());
camera.cameraRotX = unitPosition2.ToLongLat().X;
camera.cameraRotY = unitPosition2.ToLongLat().Y;
BaseZoomOnSpeed();
//ControlZoomWithKeys();
camera.UpdateCamera(graphicsDevice);
}
