public virtual Allocation Extents(double scale, Cairo.Context graphics)
{
Allocation alloc = d_allocation.Copy();
alloc.Scale(scale);
alloc.GrowBorder(3);
string lbl = Label;
if (!String.IsNullOrEmpty(lbl))
{
int width, height;
MeasureString(graphics, lbl, out width, out height);
alloc.Height += height + 3;
if (width > alloc.Width)
{
int off = (int)(width - alloc.Width / 2);
alloc.X -= off;
alloc.Width += off * 2;
}
}
d_lastExtents = alloc;
return(d_lastExtents.Copy());
}
private void DrawStandalone(Cairo.Context graphics)
{
FromState(graphics, false);
Allocation alloc = WrappedObject != null?WrappedObject.Allocation.Copy() : new Allocation(0, 0, 1, 1);
alloc.X = 0;
alloc.Y = 0;
alloc.GrowBorder(-graphics.LineWidth);
double radius = System.Math.Min(alloc.Width, alloc.Height) / 2;
double cx = alloc.X + alloc.Width / 2;
double cy = alloc.Y + alloc.Height / 2;
double angle = System.Math.PI * 1.8;
graphics.NewPath();
graphics.Arc(cx, cy, radius, 0, angle);
graphics.Stroke();
DrawArrow(graphics, cx + radius * System.Math.Cos(angle), cy + radius * System.Math.Sin(angle), angle - System.Math.PI);
}
