protected virtual Geometry GetDefiningGeometry()
{
bool isStartVisible = IsStartVisible;
bool isEndVisible = IsEndVisible;
double radius = Radius;
double thickness = GetThickness();
double sx = X1;
double sy = Y1;
double ex = X2;
double ey = Y2;
double zet = LineUtil.Zet(sx, sy, ex, ey);
double width = LineUtil.Width(radius, thickness, zet);
double height = LineUtil.Height(radius, thickness, zet);
bool shortenStart = GetShortenStart(this);
bool shortenEnd = GetShortenEnd(this);
bool isStartIO = GetStartIO();
bool isEndIO = GetEndIO();
// shorten start
if (isStartIO == true && isEndIO == false && shortenStart == true)
{
if (Math.Round(sy, 1) == Math.Round(ey, 1))
{
sx = ex - ShortenLineSize;
}
}
// shorten end
if (isStartIO == false && isEndIO == true && shortenEnd == true)
{
if (Math.Round(sy, 1) == Math.Round(ey, 1))
{
ex = sx + ShortenLineSize;
}
}
// get ellipse position
IPoint ellipseStart = LineUtil.EllipseStart(sx, sy, width, height, isStartVisible);
IPoint ellipseEnd = LineUtil.EllipseEnd(ex, ey, width, height, isEndVisible);
// get line position
IPoint lineStart = LineUtil.LineStart(sx, sy, width, height, isStartVisible);
IPoint lineEnd = LineUtil.LineEnd(ex, ey, width, height, isEndVisible);
var g = new GeometryGroup()
{
FillRule = FillRule.Nonzero
};
if (isStartVisible == true)
{
var startEllipse = new EllipseGeometry(
new Point(ellipseStart.X, ellipseStart.Y),
radius, radius);
g.Children.Add(startEllipse);
}
if (isEndVisible == true)
{
var endEllipse = new EllipseGeometry(
new Point(ellipseEnd.X, ellipseEnd.Y),
radius, radius);
g.Children.Add(endEllipse);
}
var line = new LineGeometry(
new Point(lineStart.X, lineStart.Y),
new Point(lineEnd.X, lineEnd.Y));
g.Children.Add(line);
g.Freeze();
return(g);
}