public DoubleTapZoom(ScaleImageView view, float targetZoom, float focusX, float focusY, bool stretchImageToSuper)
{
_view = view;
view.SetState(TouchState.AnimateZoom);
_startTime = DateTime.Now.Ticks;
_startZoom = view._normalizedScale;
_targetZoom = targetZoom;
_stretchImageToSuper = stretchImageToSuper;
var bitmapPoint = view.TransformCoordTouchToBitmap(focusX, focusY, false);
_bitmapX = bitmapPoint.X;
_bitmapY = bitmapPoint.Y;
//
// Used for translating image during scaling
//
_startTouch = view.TransformCoordBitmapToTouch(_bitmapX, _bitmapY);
_endTouch = new PointF(view.ViewWidth / 2f, view.ViewHeight / 2f);
}
public Fling(ScaleImageView view, int velocityX, int velocityY)
{
try
{
_view = view;
view.SetState(TouchState.Fling);
_scroller = new Scroller(view._context);
view._matrix.GetValues(view._m);
var startX = (int)view._m[Matrix.MtransX];
var startY = (int)view._m[Matrix.MtransY];
int minX, maxX, minY, maxY;
if (view.GetImageWidth() > view.ViewWidth)
{
minX = view.ViewWidth - (int)view.GetImageWidth();
maxX = 0;
}
else
{
minX = maxX = startX;
}
if (view.GetImageHeight() > view.ViewHeight)
{
minY = view.ViewHeight - (int)view.GetImageHeight();
maxY = 0;
}
else
{
minY = maxY = startY;
}
_scroller.Fling(startX, startY, velocityX, velocityY, minX, maxX, minY, maxY);
_currX = startX;
_currY = startY;
}
catch (System.Exception ex)
{
AppSettings.Logger.Warning(ex);
}
}
public ScaleListener(ScaleImageView view)
{
_view = view;
}
public GestureListener(ScaleImageView view)
{
_view = view;
}
//
// Set zoom parameters equal to another ScaleImageView. Including scale, position,
// and ScaleType.
// @param ScaleImageView
//
public void SetZoom(ScaleImageView img)
{
var center = img.GetScrollPosition();
SetZoom(img.GetCurrentZoom(), center.X, center.Y, img.GetScaleType());
}