public void pinchStart(TouchEvent ev)
{
TouchInfo t0 = ev.Touches[0];
TouchInfo t1 = ev.Touches[1];
rect[0] = Vector2d.Create( t0.PageX, t0.PageY );
rect[1] = Vector2d.Create( t1.PageX, t1.PageY );
ev.StopPropagation();
ev.PreventDefault();
// Document.Title = "pinched by an event ";
}
public void PinchMove(TouchEvent ev)
{
TouchInfo t0 = ev.Touches[0];
TouchInfo t1 = ev.Touches[1];
Vector2d[] newRect = new Vector2d[2];
newRect[0] = Vector2d.Create(t0.PageX, t0.PageY);
newRect[1] = Vector2d.Create(t1.PageX, t1.PageY);
if (rect[0] != null)
{
double oldDist = GetDistance(rect[0], rect[1]);
double newDist = GetDistance(newRect[0], newRect[1]);
double ratio = oldDist / newDist;
Zoom(ratio);
}
rect = newRect;
ev.StopPropagation();
ev.PreventDefault();
}
