public void CreatePickSpring(sw.Point ptMouse)
{
xna.Vector2 pointScreen = new xna.Vector2((float)(ptMouse.X), (float)(ptMouse.Y));
xna.Vector2 point = PhysicsCanvas.BoundaryHelper.ScreenToWorld(pointScreen);
_mousePickSpring = new FixedMouseJoint(this.BodyObject, point);
_mousePickSpring.MaxForce = 1000.0f * this.BodyObject.Mass;
_mousePickSpring.Enabled = true;
_physicsCanvas.Simulator.AddJoint(_mousePickSpring);
this.BodyObject.Awake = true;
xna.Vector2 pointBody = PhysicsCanvas.BoundaryHelper.WorldToScreen(this.BodyObject.Position);
_lineShowSpring.X1 = pointBody.X;
_lineShowSpring.Y1 = pointBody.Y;
_lineShowSpring.X2 = pointScreen.X;
_lineShowSpring.Y2 = pointScreen.Y;
_lineShowSpring.Visibility = Visibility.Visible;
}
public static void SetSize(this sw.FrameworkElement element, wf.Size size)
{
element.Width = size.Width;
element.Height = size.Height;
}
void HandleMouseMove(sw.Point pt, double rotation)
{
if (_draggingNonPhysicsSprite)
{
Canvas.SetLeft(this, pt.X - _ptMouseDownSprite.X);
Canvas.SetTop(this, pt.Y - _ptMouseDownSprite.Y);
}
else
if (_mousePickSpring != null)
{
//pt = new Point(pt.X / _physicsCanvas.TransformRoot.ScaleX, pt.Y / _physicsCanvas.TransformRoot.ScaleY);
xna.Vector2 pointScreen = new xna.Vector2((float)(pt.X), (float)(pt.Y));
xna.Vector2 point = PhysicsCanvas.BoundaryHelper.ScreenToWorld(pointScreen);
_mousePickSpring.WorldAnchorB = point;
if (rotation != 0)
{
_mousePickSpring.BodyA.Rotation += (float)(rotation);
//System.Diagnostics.Debug.WriteLine("rotated " + rotation + " deg.");
}
_lineShowSpring.X2 = pointScreen.X;
_lineShowSpring.Y2 = pointScreen.Y;
_lineShowSpring.Visibility = Visibility.Visible;
}
}
void HandleMouseUp(sw.Point pt)
{
if (_draggingNonPhysicsSprite)
{
// "scenery" type element
_draggingNonPhysicsSprite = false;
if (MousePickCompleted != null)
MousePickCompleted(this, _posMouseMoveStart);
return;
}
DestroyPickSpring();
}
public static double DistanceToLine(SysWin.Point lineStart, SysWin.Point lineEnd, SysWin.Point point)
{
double xDelta = lineEnd.X - lineStart.X;
double yDelta = lineEnd.Y - lineStart.Y;
double u = ((point.X - lineStart.X) * xDelta + (point.Y - lineStart.Y) * yDelta) / (xDelta * xDelta + yDelta * yDelta);
SysWin.Point closestPoint;
if (u < 0)
closestPoint = lineStart;
else if (u > 1)
closestPoint = lineEnd;
else
closestPoint = new SysWin.Point(lineStart.X + u * xDelta, lineStart.Y + u * yDelta);
return DistanceBetweenTwoPoints(closestPoint, point); // closestPoint.DistanceTo(point);
}
void HandleMouseDown(sw.Point pt)
{
DestroyPickSpring();
_posMouseMoveStart = this.Position;
_ptMouseDown = TransformFromCanvas(this, pt);
if (MousePickEnabled && BodyObject == null)
{
// "scenery" type element
_draggingNonPhysicsSprite = true;
if (MousePickStarted != null)
MousePickStarted(this, this.Position);
return;
}
if (MousePickEnabled && BodyObject.IsStatic && AllowStaticObjectManipulation && BodyObject.Enabled)
{
// save the static attributes
_originalAngularDamping = BodyObject.AngularDamping;
BodyObject.AngularDamping = float.MaxValue;
_bodyWasStatic = true;
BodyObject.IsStatic = false;
}
if (MousePickEnabled && BodyObject.IsStatic == false && BodyObject.Enabled)
{
CreatePickSpring(pt);
if (MousePickStarted != null)
MousePickStarted(this, this.Position);
}
}
public static double GetAngleBetween(SysWin.Point pt1, SysWin.Point pt2)
{
double retval = 57.2727272727272727 * Math.Atan2(pt2.X - pt1.X, pt2.Y - pt1.Y);
return retval;
}
/// <summary>
/// A utility function to get a point that is a given distance and angle from another point.
/// </summary>
/// <param name="angle">The angle to travel</param>
/// <param name="distance">The distance (in pixels) to go</param>
/// <param name="ptStart">The start point</param>
/// <returns></returns>
public static SysWin.Point GetPointFromDistanceAngle(double angle, double distance, SysWin.Point ptStart)
{
double theta = angle * 0.0174532925;
SysWin.Point p = new SysWin.Point();
p.X = ptStart.X + distance * Math.Cos(theta);
p.Y = ptStart.Y + distance * Math.Sin(theta);
return p;
}
/// <summary>
/// Get the distance, in pixels between two points.
/// </summary>
public static double DistanceBetweenTwoPoints(SysWin.Point pt1, SysWin.Point pt2)
{
double a = pt2.X - pt1.X;
double b = pt2.Y - pt1.Y;
return Math.Sqrt(a * a + b * b);
}
public xna.Vector2 ScreenSizeToWorldSize(SysWin.Point size)
{
return ConvertSize(new xna.Vector2((float)size.X, (float)size.Y), ScreenTopLeft, ScreenBottomRight, WorldTopLeft, WorldBottomRight, true);
}
public xna.Vector2 ScreenSizeToWorldSize(SysWin.Size size)
{
return ConvertSize(new xna.Vector2((float)size.Width, (float)size.Height), ScreenTopLeft, ScreenBottomRight, WorldTopLeft, WorldBottomRight, true);
}
