public static OrthographicCameraComponent Clone(OrthographicCameraComponent com)
{
var copied = new OrthographicCameraComponent(com.Width, com.prevScreenHeight);
copied.Copy(com);
return(copied);
}
public bool TryChangeCameraDistance(ref float delta, ref Vector3 zoomAround, out OrthographicCameraComponent changed)
{
changed = null;
// Handle the 'zoomAround' point
var target = Position + LookDirection;
var relativeTarget = zoomAround - target;
var relativePosition = zoomAround - Position;
if (relativePosition.Length() < 1e-4)
{
if (delta > 0) //If Zoom out from very close distance, increase the initial relativePosition
{
relativePosition.Normalize();
relativePosition /= 10;
}
else //If Zoom in too close, stop it.
{
return(false);
}
}
var f = Math.Pow(2.5, delta);
var newRelativePosition = relativePosition * (float)f;
var newRelativeTarget = relativeTarget * (float)f;
var newTarget = zoomAround - newRelativeTarget;
var newPosition = zoomAround - newRelativePosition;
var newDistance = (newPosition - zoomAround).Length();
var oldDistance = (Position - zoomAround).Length();
if (newDistance > FarPlaneDistance && (oldDistance < FarPlaneDistance || newDistance > oldDistance))
{
var ratio = (newDistance - FarPlaneDistance) / newDistance;
f *= 1 - ratio;
newRelativePosition = relativePosition * (float)f;
newRelativeTarget = relativeTarget * (float)f;
newTarget = zoomAround - newRelativeTarget;
newPosition = zoomAround - newRelativePosition;
delta = (float)(Math.Log(f) / Math.Log(2.5));
}
if (newDistance < NearPlaneDistance && (oldDistance > NearPlaneDistance || newDistance < oldDistance))
{
var ratio = (NearPlaneDistance - newDistance) / newDistance;
f *= (1 + ratio);
newRelativePosition = relativePosition * (float)f;
newRelativeTarget = relativeTarget * (float)f;
newTarget = zoomAround - newRelativeTarget;
newPosition = zoomAround - newRelativePosition;
delta = (float)(Math.Log(f) / Math.Log(2.5));
}
var newLookDirection = newTarget - newPosition;
changed = new OrthographicCameraComponent(Width, prevScreenHeight);
changed.Copy(this);
//new data
changed.LookDirection = newLookDirection.Normalized();
changed.Position = newPosition;
return(true);
}
