private static void MovePointHandleAtDistance(GenericPosture posture, int handle, PointF point, GenericPostureConstraintDistanceToPoint constraint, Keys modifiers)
{
if (constraint == null)
{
MovePointHandleFreely(posture, handle, point);
return;
}
PointF parent = posture.PointList[constraint.RefPoint];
PointF child = posture.PointList[posture.Handles[handle].Reference];
float distance = GeometryHelper.GetDistance(parent, child);
PointF temp = GeometryHelper.GetPointAtDistance(parent, point, distance);
int constraintAngleSubdivisions = 8; // (Constraint by 45° steps).
if ((modifiers & Keys.Shift) == Keys.Shift)
{
posture.PointList[posture.Handles[handle].Reference] = GeometryHelper.GetPointAtClosestRotationStepCardinal(parent, temp, constraintAngleSubdivisions);
}
else
{
posture.PointList[posture.Handles[handle].Reference] = temp;
}
}
private void ParseConstraint(XmlReader r)
{
// A "constraint" represents the valid positions where the handle can go.
bool isEmpty = r.IsEmptyElement;
ConstraintType type = ConstraintType.None;
string optionGroup = "";
if (r.MoveToAttribute("type"))
{
type = (ConstraintType)Enum.Parse(typeof(ConstraintType), r.ReadContentAsString());
}
if (r.MoveToAttribute("optionGroup"))
{
optionGroup = r.ReadContentAsString();
}
r.ReadStartElement();
switch (type)
{
case ConstraintType.None:
Constraint = null;
break;
case ConstraintType.LineSlide:
Constraint = new GenericPostureConstraintLineSlide(r);
break;
case ConstraintType.VerticalSlide:
Constraint = new GenericPostureConstraintVerticalSlide();
break;
case ConstraintType.HorizontalSlide:
Constraint = new GenericPostureConstraintHorizontalSlide();
break;
case ConstraintType.DistanceToPoint:
Constraint = new GenericPostureConstraintDistanceToPoint(r);
break;
case ConstraintType.RotationSteps:
Constraint = new GenericPostureConstraintRotationSteps(r);
break;
case ConstraintType.PerpendicularSlide:
Constraint = new GenericPostureConstraintPerpendicularSlide(r);
break;
case ConstraintType.ParallelSlide:
Constraint = new GenericPostureConstraintParallelSlide(r);
break;
case ConstraintType.LockedInPlace:
Constraint = new GenericPostureConstraintLockedInPlace();
break;
default:
string outerXml = r.ReadOuterXml();
log.DebugFormat("Unparsed content: {0}", outerXml);
break;
}
if (Constraint != null)
{
Constraint.Type = type;
if (!string.IsNullOrEmpty(optionGroup))
{
Constraint.OptionGroup = optionGroup;
}
}
if (!isEmpty)
{
r.ReadEndElement();
}
}
