void Zoom(float deltaTime)
{
var zoomInput = 0f;
if (UseTouchInput)
{
if (Input.touchCount == 2)
{
var touchZero = Input.GetTouch(0);
var touchOne = Input.GetTouch(1);
var touchZeroPrevPos = touchZero.position - new Vector2(touchZero.deltaPosition.x / Screen.width, touchZero.deltaPosition.y / Screen.height);
var touchOnePrevPos = touchOne.position - new Vector2(touchOne.deltaPosition.x / Screen.width, touchOne.deltaPosition.y / Screen.height);
var prevTouchDeltaMag = (touchZeroPrevPos - touchOnePrevPos).magnitude;
var touchDeltaMag = (touchZero.position - touchOne.position).magnitude;
// Zoom input
zoomInput = prevTouchDeltaMag - touchDeltaMag;
// Zoom point
var midTouch = Vector2.Lerp(touchZero.position, touchOne.position, .5f);
_zoomPoint = new Vector3(midTouch.x, midTouch.y, Mathf.Abs(Vector3D(ProCamera2D.LocalPosition)));
// Smoothness to 0
if (!_zoomStarted)
{
_zoomStarted = true;
_panTarget.position = ProCamera2D.LocalPosition - ProCamera2D.InfluencesSum;
UpdateCurrentFollowSmoothness();
RemoveFollowSmoothness();
}
// Save time
_touchZoomTime = Time.time;
}
else
{
// Reset smoothness
if (_zoomStarted && Mathf.Abs(_zoomAmount) < .001f)
{
RestoreFollowSmoothness();
_zoomStarted = false;
}
}
}
if (UseMouseInput)
{
// Zoom input
zoomInput = Input.GetAxis("Mouse ScrollWheel");
// Zoom point
_zoomPoint = new Vector3(Input.mousePosition.x, Input.mousePosition.y, Mathf.Abs(Vector3D(ProCamera2D.LocalPosition)));
}
// Stop zoom if zoomPoint not on this camera
if (!ProCamera2D.GameCamera.pixelRect.Contains(_zoomPoint))
{
return;
}
// Different zoom speed according to the platform
var zoomSpeed = UseTouchInput ? PinchZoomSpeed * 10f : MouseZoomSpeed;
// Cancel zoom if max/min reached
if ((_onMaxZoom && zoomInput * zoomSpeed < 0) || (_onMinZoom && zoomInput * zoomSpeed > 0))
{
CancelZoom();
return;
}
// Zoom amount
_zoomAmount = Mathf.SmoothDamp(_prevZoomAmount, zoomInput * zoomSpeed * deltaTime, ref _zoomVelocity, ZoomSmoothness, float.MaxValue, deltaTime);
if (UseMouseInput)
{
// Reset smoothness once zoom stops
if (Mathf.Abs(_zoomAmount) <= .0001f)
{
if (_zoomStarted)
{
RestoreFollowSmoothness();
}
_zoomStarted = false;
_prevZoomAmount = 0;
return;
}
// Smoothness to 0
if (!_zoomStarted)
{
_zoomStarted = true;
_panTarget.position = ProCamera2D.LocalPosition - ProCamera2D.InfluencesSum;
UpdateCurrentFollowSmoothness();
RemoveFollowSmoothness();
}
}
// Clamp zoom amount
var targetSize = (ProCamera2D.ScreenSizeInWorldCoordinates.y / 2) + _zoomAmount;
var minScreenSize = _initialCamSize / MaxZoomInAmount;
var maxScreenSize = MaxZoomOutAmount * _initialCamSize;
_onMaxZoom = false;
_onMinZoom = false;
if (targetSize < minScreenSize)
{
_zoomAmount -= targetSize - minScreenSize;
_onMaxZoom = true;
}
else if (targetSize > maxScreenSize)
{
_zoomAmount -= targetSize - maxScreenSize;
_onMinZoom = true;
}
// Save previous zoom amount
_prevZoomAmount = _zoomAmount;
// Move camera towards zoom point
if (ZoomToInputCenter && _zoomAmount != 0)
{
var multiplier = _zoomAmount / (ProCamera2D.ScreenSizeInWorldCoordinates.y / 2);
_panTarget.position += ((_panTarget.position - ProCamera2D.GameCamera.ScreenToWorldPoint(_zoomPoint)) * multiplier);
}
// Zoom
ProCamera2D.Zoom(_zoomAmount);
IsZooming = true;
}
