// Default Constructor
public Camera()
{
position = new Vertex (0.0f, 0.0f, 0.0f);
viewdir = new Vector (0.0f, 0.0f, -1.0f);
right = new Vector (1.0f, 0.0f, 0.0f);
up = new Vector (0.0f, 1.0f, 0.0f);
}
public Camera(float x, float y, float z)
{
position = new Vertex (x, y, z);
viewdir = new Vector (0.0f, 0.0f, -1.0f);
right = new Vector (1.0f, 0.0f, 0.0f);
up = new Vector (0.0f, 1.0f, 0.0f);
}
// Positional Constructors
public Camera(Vertex position)
{
this.position = position;
viewdir = new Vector (0.0f, 0.0f, -1.0f);
right = new Vector (1.0f, 0.0f, 0.0f);
up = new Vector (0.0f, 1.0f, 0.0f);
}
// Constructors
public FloatingCageScene()
: base()
{
innerCage = new Vertex ();
outerCage = new Vertex ();
camera = new Vertex ();
}
public override bool AdvanceFrame()
{
bool zoom = false;
innerCage += InnerRotation;
outerCage += OuterRotation;
if (state == State.ZoomIn) {
camera -= CameraZoom;
zoom = true;
} else if (state == State.ZoomOut) {
camera += CameraZoom;
zoom = true;
} else if (state == State.FadeOut) {
// this is a short-lived state as well
zoom = true;
}
if ((zoom && nFrames == 175) || nFrames == 800) {
nFrames = 0;
state++;
} else
nFrames++;
return state != State.Complete;
}
public Camera(Vertex position, Vertex target, Vector upVector)
{
this.position = position;
LookAt (target, upVector);
}
// Positional + LookAt Constructors
public Camera(Vertex position, Vertex target)
{
this.position = position;
LookAt (target);
}
// Strafe the camera left or right, relative to the camera's orientation
public void Strafe(float amount)
{
position += (right * amount);
}
// Zoom the camera in or out, relative to the camera's orientation (obviously)
public void Zoom(float amount)
{
position += (viewdir * amount);
}
// Move the camera to a specific position, keeping its orientation
public void MoveTo(Vertex point)
{
position = point;
}
// Move the camera to a specific position, keeping its orientation
public void MoveTo(float x, float y, float z)
{
position = new Vertex (x, y, z);
}
// Move the camera relative to world axis
public void Move(Vector amount)
{
position += amount;
}
// Direct the camera toward a specific point in space using the specified upward orientation
public void LookAt(Vertex point, Vector upVector)
{
viewdir = point - position;
viewdir.Normalize ();
up = upVector.Normal;
right = viewdir.Cross (up);
right.Normalize ();
}
public void LookAt(Vertex point)
{
Vector delta = point - position;
viewdir = delta.Normal;
if (Math.Abs (delta.x) < 0.00001f && Math.Abs (delta.z) < 0.00001f) {
delta.x = 0.0f;
delta.Normalize ();
right = new Vector (1.0f, 0.0f, 0.0f);
up = delta.Cross (right);
right = viewdir.Cross (up) * -1.0f;
} else {
delta.y = 0.0f;
delta.Normalize ();
up = new Vector (0.0f, 1.0f, 0.0f);
right = delta.Cross (up) * -1.0f;
up = viewdir.Cross (right);
}
right.Normalize ();
up.Normalize ();
}
// Methods
// Direct the camera toward a specific point in space
public void LookAt(float x, float y, float z)
{
Vertex point = new Vertex (x, y, z);
LookAt (point);
}
// Change the elevation of the camera, relative to the camera's orientation
public void Elevate(float amount)
{
position += (up * amount);
}