public ZoomCanvas()
{
overlaySurface.TransformationPivot = SKPoint.Empty;
overlaySurface.AttachParent(this);
this.GestureRecognizers.Add(panGesture);
panGesture.PanUpdated += PanGesture_PanUpdated;
this.GestureRecognizers.Add(pinchGesture);
pinchGesture.PinchUpdated += OnPinchUpdated;
ZoomCommand = new Command(o =>
{
float scaleFactor = 0;
if (o is string)
{
scaleFactor = float.Parse((string)o, CultureInfo.InvariantCulture);
}
else
{
scaleFactor = Convert.ToSingle(o);
}
scaleTransformation = SKMatrix.MakeScale((float)scaleFactor, (float)scaleFactor);
surface.Transformation = translateTransformation.Concat(scaleTransformation);
});
IncrementalZoomCommand = new Command(o =>
{
float scaleFactor = 0;
if (o is string)
{
scaleFactor = float.Parse((string)o, CultureInfo.InvariantCulture);
}
else
{
scaleFactor = Convert.ToSingle(o);
}
scaleTransformation = scaleTransformation
.Scale(scaleFactor, scaleFactor);
surface.Transformation = translateTransformation.Concat(scaleTransformation);
});
}