//-///////////////////////////////////////////////////////////////////////
//-///////////////////////////////////////////////////////////////////////
public override void Draw(Graphics g)
{
if (_transform == null)
{
return;
}
PointF screenPos = Misc.TransformPoint(_transform, (V2)this.Attr.GetValue()).AsPointF();
GraphicsState gs = g.Save();
g.ResetClip();
g.ResetTransform();
Color colour;
if (_hot)
{
colour = Color.LightGray;
}
else
{
colour = Color.Black;
}
colour = Color.FromArgb(128, colour.R, colour.G, colour.B);
g.FillEllipse(new SolidBrush(colour), screenPos.X - _radius, screenPos.Y - _radius, _radius * 2, _radius * 2);
g.Restore(gs);
}
//-///////////////////////////////////////////////////////////////////////
//-///////////////////////////////////////////////////////////////////////
private void text(V2 pos, string text)
{
if (_graphics == null)
{
return;
}
Matrix oldTransform = _graphics.Transform;
_graphics.Transform = identityMatrix;
V2 screenPos = Misc.TransformPoint(oldTransform, pos);
_graphics.DrawString(text, SystemFonts.DefaultFont, _drawBrush, screenPos.AsPointF());
_graphics.Transform = oldTransform;
}
//-///////////////////////////////////////////////////////////////////////
//-///////////////////////////////////////////////////////////////////////
private bool GetPositions(out PointF screenPos, out PointF handlePos, out double thetaOffset)
{
screenPos = PointF.Empty;
handlePos = PointF.Empty;
thetaOffset = 0.0;
if (_transform == null)
{
return(false);
}
screenPos = Misc.TransformPoint(_transform, _pos).AsPointF();
double theta = Convert.ToDouble(Attr.GetValue());
float[] elements = _transform.Elements;
thetaOffset = Math.Atan2(elements[1], elements[0]);
handlePos = new PointF((float)(screenPos.X + Math.Cos(theta + thetaOffset) * _radius),
(float)(screenPos.Y + Math.Sin(theta + thetaOffset) * _radius));
return(true);
}
//-///////////////////////////////////////////////////////////////////////
//-///////////////////////////////////////////////////////////////////////
public override bool HandleMouseEvent(object sender, MouseEventArgs mea, V2 mouseScenePos)
{
if (_transform == null)
{
_dragging = false;
return(false);
}
V2 mouseScreenPos = new V2(mea.Location.X, mea.Location.Y);
bool hover = false;
V2 delta = V2.V00;
if (!_dragging)
{
V2 screenPos = Misc.TransformPoint(_transform, (V2)this.Attr.GetValue());
delta = screenPos - mouseScreenPos;
if (delta.lensq() < _radius * _radius)
{
hover = true;
}
}
if ((mea.Button & MouseButtons.Left) != 0)
{
if (!_dragging)
{
if (hover)
{
_dragDelta = delta;
_dragging = true;
}
}
else
{
Matrix invTransform = _transform.Clone();
invTransform.Invert();
V2 screenPos = mouseScreenPos + _dragDelta;
V2 scenePos = Misc.TransformPoint(invTransform, screenPos);
this.Attr.SetValue(scenePos);
}
}
else
{
_dragging = false;
}
if (hover)
{
_hot = true;
}
else if (_dragging)
{
_hot = true;
}
else
{
_hot = false;
}
return(_dragging);
}