/// <summary>
/// Creates and adds <see cref="SnapLine"/>s for the free <see cref="AdditionalSnapLineVisualCreator"/>
/// to a <see cref="GraphSnapContext"/>.
/// </summary>
/// <remarks>
/// While the <see cref="AdditionalSnapLineVisualCreator"/>s are used to visualize and represent free snap lines,
/// according <see cref="OrthogonalSnapLine"/>s have to be added to the snapping mechanism to describe their snapping behavior.
/// </remarks>
/// <param name="sender">The snap context sending this event.</param>
/// <param name="e">The event arguments to add the snap lines to.</param>
protected virtual void CollectAdditionalGraphSnapLines(object sender, CollectGraphSnapLinesEventArgs e)
{
foreach (var creator in AdditionalSnapLineVisualCreators)
{
foreach (var snapLine in creator.CreateSnapLines())
{
e.AddAdditionalSnapLine(snapLine);
}
}
}
/// <summary>
/// Calls <see cref="ISnapLineProvider.AddSnapLines"/> of the wrapped provider and adds custom <see cref="OrthogonalSnapLine"/>s
/// for the <paramref name="item"/>.
/// </summary>
/// <param name="context">The context which holds the settings for the snap lines. </param>
/// <param name="args">The argument to use for adding snap lines.</param>
/// <param name="item">The item to add snaplines for.</param>
public void AddSnapLines(GraphSnapContext context, CollectGraphSnapLinesEventArgs args, IModelItem item)
{
wrapped.AddSnapLines(context, args, item);
// add snaplines for orthogonal labels
ILabelOwner labelOwner = item as ILabelOwner;
if (labelOwner != null)
{
foreach (ILabel label in labelOwner.Labels)
{
var layout = label.GetLayout();
double upX = Math.Round(layout.UpX, 6); // round UpX to it's first 6 digits
if (upX == 0 || upX == 1 || upX == -1) // check if it's orthogonal
// label is orthogonal
{
RectD bounds = layout.GetBounds();
// add snaplines to the top, bottom, left and right border of the label
PointD topCenter = bounds.TopLeft + new PointD(layout.Width / 2, 0);
var snapLine = new OrthogonalSnapLine(SnapLineOrientation.Horizontal, SnapLineSnapTypes.Bottom,
SnapLine.SnapLineFixedLineKey, topCenter, bounds.MinX - 10, bounds.MaxX + 10, label, 100);
args.AddAdditionalSnapLine(snapLine);
PointD bottomCenter = bounds.BottomLeft + new PointD(layout.Width / 2, 0);
snapLine = new OrthogonalSnapLine(SnapLineOrientation.Horizontal, SnapLineSnapTypes.Top,
SnapLine.SnapLineFixedLineKey, bottomCenter, bounds.MinX - 10, bounds.MaxX + 10, label, 100);
args.AddAdditionalSnapLine(snapLine);
PointD leftCenter = bounds.TopLeft + new PointD(0, layout.Height / 2);
snapLine = new OrthogonalSnapLine(SnapLineOrientation.Vertical, SnapLineSnapTypes.Right,
SnapLine.SnapLineFixedLineKey, leftCenter, bounds.MinY - 10, bounds.MaxY + 10, label, 100);
args.AddAdditionalSnapLine(snapLine);
PointD rightCenter = bounds.TopRight + new PointD(0, layout.Height / 2);
snapLine = new OrthogonalSnapLine(SnapLineOrientation.Vertical, SnapLineSnapTypes.Left,
SnapLine.SnapLineFixedLineKey, rightCenter, bounds.MinY - 10, bounds.MaxY + 10, label, 100);
args.AddAdditionalSnapLine(snapLine);
}
}
}
}