override protected void CollectGridSnapResults(GraphSnapContext context, CollectSnapResultsEventArgs args, RectD suggestedLayout, INode node)
{
// node.Layout isn't updated, yet, so we have to calculate the delta between the the new suggested layout and the current node.Layout
PointD delta = suggestedLayout.TopLeft - node.Layout.GetTopLeft();
// get outline of the shape and iterate over it's path point
IShapeGeometry geometry = node.Style.Renderer.GetShapeGeometry(node, node.Style);
GeneralPath outline = geometry.GetOutline();
if (outline != null)
{
GeneralPath.PathCursor cursor = outline.CreateCursor();
while (cursor.MoveNext())
{
// ignore PathType.Close as we had the path point as first point
// and cursor.CurrentEndPoint is always (0, 0) for PathType.Close
if (cursor.PathType != PathType.Close)
{
// adjust path point by the delta calculated above and add an according SnapResult
PointD endPoint = cursor.CurrentEndPoint + delta;
AddGridSnapResultCore(context, args, endPoint, node, GridSnapTypes.GridPoints, SnapPolicy.ToNearest, SnapPolicy.ToNearest);
}
}
}
}
private void CollectSnapResults(object sender, CollectSnapResultsEventArgs args)
{
var lastEvent = args.Context.CanvasControl.LastInputEvent;
var fixedAspectRatio = Handle.RatioReshapeRecognizer.Invoke(this, lastEvent);
var centered = Handle.CenterReshapeRecognizer.Invoke(this, lastEvent);
var reshapePolicy = fixedAspectRatio ? Handle.ReshapePolicy : ReshapePolicy.None;
var ratio = OriginalBounds.Width / OriginalBounds.Height;
var minScaleX = Handle.MinimumSize.Width / this.OriginalBounds.Width;
var minScaleY = Handle.MinimumSize.Height / this.OriginalBounds.Height;
var maxScaleX = Handle.MaximumSize.Width / this.OriginalBounds.Width;
var maxScaleY = Handle.MaximumSize.Height / this.OriginalBounds.Height;
foreach (var pair in reshapeSnapResultProviders)
{
// for each selected node that has an INodeReshapeSnapResultProvider we have to create
// a suiting ReshapeRectangleContext
var node = pair.Key;
var layout = originalNodeLayouts[node];
// get factors that determine how the node layout changes depending on the mouse delta
var topLeftChangeFactor = FixZero(GetFactor(layout.MinX, layout.MinY, layout, centered, Handle.Position));
var bottomRightChangeFactor = FixZero(GetFactor(layout.MaxX, layout.MaxY, layout, centered, Handle.Position));
// the SizeChangeFactor can be calculated using those two factors
var pointDiffFactor = FixZero(bottomRightChangeFactor - topLeftChangeFactor);
var sizeChangeFactor = new SizeD(pointDiffFactor.X, pointDiffFactor.Y);
var reshapeRectangleContext = new ReshapeRectangleContext(
layout,
new SizeD(layout.Width * minScaleX, layout.Height * minScaleY),
new SizeD(layout.Width * maxScaleX, layout.Height * maxScaleY),
RectD.Empty, RectD.Infinite,
Handle.Position,
topLeftChangeFactor,
bottomRightChangeFactor,
sizeChangeFactor,
reshapePolicy,
ratio);
// call the INodeReshapeSnapResultProvider
pair.Value.CollectSnapResults((GraphSnapContext)sender, args, node, reshapeRectangleContext);
}
}
protected override void CollectGridSnapResults(GraphSnapContext context, CollectSnapResultsEventArgs args, RectD suggestedLayout, INode node)
{
AddGridSnapResult(context, args, suggestedLayout.GetTopLeft(), node);
}