GetBounds()
{
AssertValid();
if (m_oEdge.IsSelfLoop)
{
Debug.Assert(false);
throw new InvalidOperationException("Edge is self-loop.");
}
// Start with a rectangle that has the same dimensions as the edge, but
// that starts at the origin and has an angle of zero.
Point oVertex1Location = WpfGraphicsUtil.PointFToWpfPoint(
m_oEdge.Vertex1.Location);
Point oVertex2Location = WpfGraphicsUtil.PointFToWpfPoint(
m_oEdge.Vertex2.Location);
Double dLength = WpfGraphicsUtil.GetDistanceBetweenPoints(
oVertex1Location, oVertex2Location);
Double dAngleDegrees = MathUtil.RadiansToDegrees(
WpfGraphicsUtil.GetAngleBetweenPointsRadians(
oVertex1Location, oVertex2Location));
Double dHalfWidth = m_dWidth / 2.0;
Point[] ao4BoundingPoints = new Point[4] {
new Point(0, -dHalfWidth),
new Point(dLength, -dHalfWidth),
new Point(dLength, dHalfWidth),
new Point(0, dHalfWidth),
};
// Rotate the rectangle so it is at the same angle as the edge.
TransformPoints(new RotateTransform(dAngleDegrees), ao4BoundingPoints);
// Translate the rotated rectangle to the location of the edge's first
// endpoint.
TransformPoints(
new TranslateTransform(oVertex1Location.X, oVertex1Location.Y),
ao4BoundingPoints);
// Create a PathGeometry from the bounding points.
return(WpfPathGeometryUtil.GetPathGeometryFromPoints(
ao4BoundingPoints[0],
ao4BoundingPoints[1],
ao4BoundingPoints[2],
ao4BoundingPoints[3]
));
}