List <SnapResult> GetClosestSnapElements(Rect sourceRect, Orientation orientation)
{
SnapReference startReference = orientation == Orientation.Horizontal ? SnapReference.LeftEdge : SnapReference.TopEdge;
SnapReference centerReference = orientation == Orientation.Horizontal ? SnapReference.HorizontalCenter : SnapReference.VerticalCenter;
SnapReference endReference = orientation == Orientation.Horizontal ? SnapReference.RightEdge : SnapReference.BottomEdge;
List <SnapResult> results = new List <SnapResult>(3);
SnapResult result = GetClosestSnapElement(sourceRect, startReference, startReference, centerReference, endReference);
if (result != null)
{
results.Add(result);
}
result = GetClosestSnapElement(sourceRect, centerReference, startReference, centerReference, endReference);
if (result != null)
{
results.Add(result);
}
result = GetClosestSnapElement(sourceRect, endReference, startReference, centerReference, endReference);
if (result != null)
{
results.Add(result);
}
// Look for the minimum
if (results.Count > 0)
{
results.Sort((a, b) => a.distance.CompareTo(b.distance));
float minDistance = results[0].distance;
results.RemoveAll(r => Math.Abs(r.distance - minDistance) > 0.01f);
}
return(results);
}
SnapResult GetClosestSnapElement(Rect sourceRect, SnapReference sourceRef, Rect snappableRect, SnapReference startReference, SnapReference centerReference, SnapReference endReference)
{
float sourcePos = GetPos(sourceRect, sourceRef);
float offsetStart = sourcePos - GetPos(snappableRect, startReference);
float offsetEnd = sourcePos - GetPos(snappableRect, endReference);
float minOffset = offsetStart;
SnapReference minSnappableReference = startReference;
if (Math.Abs(minOffset) > Math.Abs(offsetEnd))
{
minOffset = offsetEnd;
minSnappableReference = endReference;
}
SnapResult minResult = new SnapResult
{
sourceRect = sourceRect,
sourceReference = sourceRef,
snappableRect = snappableRect,
snappableReference = minSnappableReference,
offset = minOffset
};
if (minResult.distance <= snapDistance * 1 / m_CurrentScale)
{
return(minResult);
}
else
{
return(null);
}
}
void ApplyResult(Rect sourceRect, ref Rect r1, SnapResult result)
{
if (result.snappableReference <= SnapReference.RightEdge)
{
r1.x = sourceRect.x - result.offset;
}
else
{
r1.y = sourceRect.y - result.offset;
}
}
SnapResult GetClosestSnapElement(Rect sourceRect, SnapReference sourceRef, SnapReference startReference, SnapReference centerReference, SnapReference endReference)
{
SnapResult minResult = null;
float minDistance = float.MaxValue;
foreach (Rect snappableRect in m_SnappableRects)
{
SnapResult result = GetClosestSnapElement(sourceRect, sourceRef, snappableRect, startReference, centerReference, endReference);
if (result != null && minDistance > result.distance)
{
minDistance = result.distance;
minResult = result;
}
}
return(minResult);
}