public Guidelines GenerateGuidelines(IEnumerable <Rect> rectangles)
{
_guidelines.Clear();
foreach (var rect in rectangles)
{
var centerPoint = Bounds.CenterOf(rect);
_guidelines.Add(new Guideline {
Position = rect.Top, Orientation = GuideLineOrientation.Horizontal, Type = GuidelineType.Edge
});
_guidelines.Add(new Guideline {
Position = rect.Bottom, Orientation = GuideLineOrientation.Horizontal, Type = GuidelineType.Edge
});
_guidelines.Add(new Guideline {
Position = centerPoint.Y, Orientation = GuideLineOrientation.Horizontal, Type = GuidelineType.Center
});
_guidelines.Add(new Guideline {
Position = rect.Left, Orientation = GuideLineOrientation.Vertical, Type = GuidelineType.Edge
});
_guidelines.Add(new Guideline {
Position = rect.Right, Orientation = GuideLineOrientation.Vertical, Type = GuidelineType.Edge
});
_guidelines.Add(new Guideline {
Position = centerPoint.X, Orientation = GuideLineOrientation.Vertical, Type = GuidelineType.Center
});
}
OnLinesUpdated();
return(this);
}
private static Point GetTrackingPoint(CardElement element, string direction)
{
var point = Bounds.CenterOf(element.Bounds);
if (direction.Contains("Top"))
{
point.Y = element.Top;
}
if (direction.Contains("Bottom"))
{
point.Y = element.Bounds.Bottom;
}
if (direction.Contains("Left"))
{
point.X = element.Left;
}
if (direction.Contains("Right"))
{
point.X = element.Bounds.Right;
}
return(point);
}
private Rect GetHorizontalSnap(Rect rect)
{
var results = new List <SnapResult>();
foreach (var guideline in _guidelines.Where(gl => gl.Orientation == GuideLineOrientation.Vertical && gl.Type == GuidelineType.Edge))
{
guideline.IsActive = false;
var delta = rect.Left - guideline.Position;
if (_inSnapDistance(delta))
{
results.Add(new SnapResult
{
GuideLine = guideline,
Delta = delta,
SnappedRect = new Rect(guideline.Position, rect.Top, rect.Width, rect.Height)
});
}
delta = rect.Right - guideline.Position;
if (_inSnapDistance(delta))
{
results.Add(new SnapResult
{
GuideLine = guideline,
Delta = delta,
SnappedRect = new Rect(guideline.Position - rect.Width, rect.Top, rect.Width, rect.Height)
});
}
}
foreach (var guideline in _guidelines.Where(gl => gl.Orientation == GuideLineOrientation.Vertical && gl.Type == GuidelineType.Center))
{
guideline.IsActive = false;
var centerLine = Bounds.CenterOf(rect).X;
var delta = centerLine - guideline.Position;
if (_inSnapDistance(delta))
{
results.Add(new SnapResult
{
GuideLine = guideline,
Delta = delta,
SnappedRect = new Rect(guideline.Position - rect.Width / 2f, rect.Top, rect.Width, rect.Height)
});
}
}
if (results.Any())
{
var closest = results.OrderBy(r => r.Delta).First();
foreach (var result in results.Where(r => r.Delta == closest.Delta))
{
result.GuideLine.IsActive = true;
}
return(closest.SnappedRect);
}
return(rect);
}