// copied from http://www.developer.nokia.com/Community/Wiki/Real-time_rotation_of_the_Windows_Phone_8_Map_Control
public static double angleBetween2Lines(PinchContactPoints line1, PinchContactPoints line2)
{
if (line1 != null && line2 != null)
{
double angle1 = Math.Atan2(line1.PrimaryContact.Y - line1.SecondaryContact.Y,
line1.PrimaryContact.X - line1.SecondaryContact.X);
double angle2 = Math.Atan2(line2.PrimaryContact.Y - line2.SecondaryContact.Y,
line2.PrimaryContact.X - line2.SecondaryContact.X);
return (angle1 - angle2) * 180 / Math.PI;
}
else { return 0.0; }
}
private double AngleOf(PinchContactPoints points)
{
var vec = new Point(points.SecondaryContact.X - points.PrimaryContact.X, points.SecondaryContact.Y - points.PrimaryContact.Y);
double angle = Math.Atan2(vec.Y, vec.X);
if (angle < 0)
{
angle += 2 * Math.PI;
}
return(angle * 180 / Math.PI);
}
// copied from http://www.developer.nokia.com/Community/Wiki/Real-time_rotation_of_the_Windows_Phone_8_Map_Control
public static double angleBetween2Lines(PinchContactPoints line1, PinchContactPoints line2)
{
if (line1 != null && line2 != null)
{
double angle1 = Math.Atan2(line1.PrimaryContact.Y - line1.SecondaryContact.Y,
line1.PrimaryContact.X - line1.SecondaryContact.X);
double angle2 = Math.Atan2(line2.PrimaryContact.Y - line2.SecondaryContact.Y,
line2.PrimaryContact.X - line2.SecondaryContact.X);
return((angle1 - angle2) * 180 / Math.PI);
}
else
{
return(0.0);
}
}
private double GetAngle(PinchContactPoints points)
{
Point directionVector = new Point(points.SecondaryContact.X - points.PrimaryContact.X, points.SecondaryContact.Y - points.PrimaryContact.Y);
return(GetAngle(directionVector.X, directionVector.Y));
}
private double AngleOf(PinchContactPoints points)
{
var vec = new Point(points.SecondaryContact.X - points.PrimaryContact.X, points.SecondaryContact.Y - points.PrimaryContact.Y);
double angle = Math.Atan2(vec.Y, vec.X);
if (angle < 0)
{
angle += 2 * Math.PI;
}
return angle * 180 / Math.PI;
}
private double GetAngle(PinchContactPoints points)
{
Point directionVector = new Point(points.SecondaryContact.X - points.PrimaryContact.X, points.SecondaryContact.Y - points.PrimaryContact.Y);
return GetAngle(directionVector.X, directionVector.Y);
}
public void RotationChange(PinchContactPoints current, PinchContactPoints origin)
{
if (_gradientBase is EllipseGradient) return;
double angleDelta = GetAngle(current.PrimaryContact, current.SecondaryContact) - GetAngle(origin.PrimaryContact, origin.SecondaryContact);
_bokehData.Angle = _preAngle + angleDelta;
}
