//we always adjust position in order to keep the camera in scene.The sceneBorder should always be non-null.
void AdjustPos()
{
var border = CamUtility.BoundToRect(sceneBorder.bounds);
var camBorder = CamUtility.GetCamViewRect(cam);
var y_diff = 0f;
var x_diff = 0f;
if (camBorder.yMax < border.yMin)
{
y_diff = border.yMin - camBorder.yMax;
}
else if (camBorder.yMin > border.yMax)
{
y_diff = border.yMax - camBorder.yMin;
}
if (camBorder.xMin < border.xMin)
{
x_diff = border.xMin - camBorder.xMin;
}
else if (camBorder.xMax > border.xMax)
{
x_diff = border.xMax - camBorder.xMax;
}
var mov_vec = new Vector3(x_diff, y_diff, 0);
this.cam.transform.Translate(mov_vec);
}
//三元逻辑
public bool?BirdWithinScene()
{
if (birdUnderWatch != null)
{
var sceneBound = sceneBorder.bounds;
var scenceRect = CamUtility.BoundToRect(sceneBound);
var birdPos = new Vector2(
birdUnderWatch.transform.position.x,
birdUnderWatch.transform.position.y
);
//if the bird goes out of scene or it just reached some low speed, stop watch
return(scenceRect.Contains(birdPos) && birdUnderWatch.GetComponent <Rigidbody2D>().velocity.magnitude >= deadSpeed);
}
else
{
return(new bool?());
}
}