private static void UpdateArrowHeadDirections(LinearDimension dl)
{
var v = dl.DimensionLineP1 - dl.DimensionLineP2;
v.Normalize();
dl.ArrowHead1Direction = v;
v.Negate();
dl.ArrowHead2Direction = v;
}
private static void InitializeOffsetPoint(LinearDimension dl)
{
var d = Vector.Multiply(dl.P1 - dl.P2, dl.OffsetDirection);
Point op = d < 0
? dl.P2
: dl.P1;
if (IsNan(dl.OffsetPoint) || (dl.OffsetPoint - op).Length > 1e-3)
{
dl.SetCurrentValue(OffsetPointProperty, dl.P2);
dl._hasExplicitOffsetPoint = false;
}
}
private static Point GetOffsetPoint(Point p, LinearDimension dl)
{
var op = dl.OffsetPoint + (dl.Scale * dl.Offset * dl.OffsetDirection);
var d = Vector.Multiply(op - p, dl.OffsetDirection);
return p + (d * dl.OffsetDirection);
}
private static void InitializeOffsetVector(LinearDimension dl)
{
var v = dl.P1 - dl.P2;
v.Normalize();
var dir = Vector.Multiply(v, Rotate90Cw.Value);
if (!dl.OffsetDirection.Equals(dir))
{
dl.SetCurrentValue(OffsetDirectionProperty, dir);
dl._hasExplicitOffsetDirection = false;
}
}