/// <summary>
/// Updates the <see cref="Camera"/>'s position and scale (view and camera) according to a given <see cref="CameraBehavior"/> and view size, adjusting the <paramref name="lerpSpeed"/> to match a constant <paramref name="frameRate"/>.
/// </summary>
/// <param name="canvasSize">The size of the canvas.</param>
/// <param name="focus">The focal point of the view, which the <see cref="Camera"/> will move towards.</param>
/// <param name="cameraBehavior">A <see cref="CameraBehavior"/> object that will determine how the <see cref="Camera"/> behaves.</param>
/// <param name="lerpSpeed">The inverse of the distance between the current value and the desired value to travel. Must be greater than 1.</param>
/// <param name="frameTime">Indicates the desired frame time (in milliseconds), which will adjust the <see cref="Camera"/> moevement accordingly.</param>
public void UpdateCamera(SKSize canvasSize, CameraBehavior cameraBehavior, Vector2 focus, float lerpSpeed = 10f, float frameTime = 30)
{
SetView(new Vector2(canvasSize.Width, canvasSize.Height), 1);
float frames = 1;
if (stopwatch.ElapsedMilliseconds <= lerpSpeed * frameTime && stopwatch.ElapsedMilliseconds > 0)
{
frames = stopwatch.ElapsedMilliseconds / frameTime;
}
MoveCamera(cameraBehavior, focus, lerpSpeed / frames);
stopwatch.Restart();
}
/// <summary>
/// Moves the camera towards a given position with a specified speed while obeying the given <see cref="CameraBehavior"/> ruleset.
/// </summary>
/// <param name="camBehavior">The behavior of the <see cref="Camera"/> as a <see cref="CameraBehavior"/>, specifying desired zoom, bounds, and movement type.</param>
/// <param name="position">The desired focus position for the <see cref="Camera"/> to move towards.</param>
/// <param name="lerpSpeed">The inverse of the distance between the current value and the desired value to travel. Must be greater than 1.</param>
public void MoveCamera(CameraBehavior camBehavior, Vector2 position, float lerpSpeed = 10f)
{
Bounds bounds = camBehavior.Bounds;
if (camBehavior.BehaviorType == CameraBehaviorType.Fit)
{
float zoom = camBehavior.DesiredZoom ?? MinZoom(bounds);
LerpCamera(bounds.Center(), zoom, lerpSpeed);
}
else if (camBehavior.BehaviorType == CameraBehaviorType.Fill)
{
float zoom = camBehavior.DesiredZoom ?? FullZoom(bounds);
LerpCamera(BoundPosition(position, bounds, zoom), zoom, lerpSpeed);
}
else if (camBehavior.BehaviorType == CameraBehaviorType.Free)
{
float zoom = camBehavior.DesiredZoom ?? FullZoom(bounds);
LerpCamera(position, zoom, lerpSpeed);
}
}
