public override void OnPointerPressed(DesignCanvas canvas, PointerRoutedEventArgs args)
{
base.OnPointerPressed(canvas, args);
var ptPoint = args.GetCurrentPoint(canvas);
if (ptPoint.Properties.IsLeftButtonPressed && canvas.Layer is Data.Layer layer)
{
var pos = canvas.FromClientPosition(ptPoint.Position);
// TODO: should we ignore Anchor/Component etc. here?
var tappedItem = canvas.HitTest(pos, testSegments: true);
var selPoint = GetSelectedPoint(layer);
_screenOrigin = ptPoint.Position;
_undoGroup = layer.CreateUndoGroup();
if (tappedItem is Data.Point tappedPoint && tappedPoint.Type != Data.PointType.None)
{
var tappedPath = tappedPoint.Parent;
if (Is.AtOpenBoundary(tappedPoint))
{
// If we click a boundary from another boundary, join the paths
if (selPoint != null && Is.AtOpenBoundary(selPoint) && AreVisiblyDistinct(canvas, selPoint, tappedPoint))
{
var selPath = selPoint.Parent;
var selPoints = selPath.Points;
if (selPoint.Type == Data.PointType.None)
{
selPoint.IsSelected = false;
selPoints.Pop();
var lastOn = selPoints.Last();
_stashedOffCurve = (selPoint, lastOn.IsSmooth);
lastOn.IsSmooth = false;
}
Outline.JoinPaths(selPath, selPoints[0] == selPoint,
tappedPath, tappedPath.Points[0] == tappedPoint);
// Drag a control point, except if we're joining a different path (as we're not at boundary
// of the resulting path)
if (selPath == tappedPath)
{
_path = selPath;
}
}
// Otherwise reverse the path if needed and we'll drag the boundary point
else
{
if (tappedPoint == tappedPath.Points.First())
{
tappedPath.Reverse();
}
_path = tappedPath;
}
}
// If we clicked on an inside point, just break its path open.
else
{
TryRemoveTrailingOffCurve(layer);
layer.ClearSelection();
Outline.BreakPath(tappedPath, tappedPath.Points.IndexOf(tappedPoint));
}
if (selPoint != null)
{
selPoint.IsSelected = false;
}
tappedPoint.IsSelected = true;
}
else if (tappedItem is Data.Segment segment)
{
var result = segment.ProjectPoint(pos.ToVector2());
if (result.HasValue)
{
var t = result.Value.Item2;
if (!args.KeyModifiers.HasFlag(VirtualKeyModifiers.Shift))
{
layer.ClearSelection();
}
var otherSegment = segment.SplitAt(t);
foreach (var point in Enumerable.Concat(segment.Points, otherSegment.OffCurves))
{
point.X = Outline.RoundToGrid(point.X);
point.Y = Outline.RoundToGrid(point.Y);
}
_point = segment.OnCurve;
_point.IsSelected = true;
_undoGroup.Dispose();
_undoGroup = layer.CreateUndoGroup();
}
}
else
{
ObserverList <Data.Point> points;
Data.PointType type;
// Add a point to the current path, if any
if (selPoint != null && Is.AtOpenBoundary(selPoint))
{
_path = selPoint.Parent;
points = _path.Points;
var lastPoint = points.Last();
lastPoint.IsSelected = false;
if (lastPoint.Type == Data.PointType.None)
{
points.Pop();
var lastOn = points.Last();
_stashedOffCurve = (lastPoint, lastOn.IsSmooth);
lastOn.IsSmooth = false;
// For shift origin, always use an onCurve
lastPoint = lastOn;
}
if (args.KeyModifiers.HasFlag(VirtualKeyModifiers.Shift))
{
pos = ClampToOrigin(pos, new Point(lastPoint.X, lastPoint.Y));
}
type = Data.PointType.Line;
}
// Else just create a new one
else
{
_path = new Data.Path();
points = _path.Points;
layer.Paths.Add(_path);
type = Data.PointType.Move;
}
// In any case, unselect all points (*click*) and enable new point
layer.ClearSelection();
var x = Outline.RoundToGrid((float)pos.X);
var y = Outline.RoundToGrid((float)pos.Y);
points.Add(new Data.Point(x, y, type)
{
IsSelected = true
});
}
((App)Application.Current).InvalidateData();
}