protected override void OnFillRegionComputed(Document document, Point[][] polygonSet)
{
var undoAction = new SelectionHistoryItem(Icon, Name);
undoAction.TakeSnapshot();
document.PreviousSelection.Dispose();
document.PreviousSelection = document.Selection.Clone();
document.Selection.SelectionPolygons.Clear();
SelectionModeHandler.PerformSelectionMode(combine_mode, DocumentSelection.ConvertToPolygons(polygonSet));
document.History.PushNewItem(undoAction);
document.Workspace.Invalidate();
}
protected override void OnFillRegionComputed(Point[][] polygonSet)
{
Document doc = PintaCore.Workspace.ActiveDocument;
SelectionHistoryItem undoAction = new SelectionHistoryItem(this.Icon, this.Name);
undoAction.TakeSnapshot();
//Convert Pinta's passed in Polygon Set to a Clipper Polygon collection.
List <List <IntPoint> > newPolygons = DocumentSelection.ConvertToPolygons(polygonSet);
using (Context g = new Context(PintaCore.Layers.CurrentLayer.Surface))
{
//Make sure time isn't wasted if the CombineMode is Replace - Replace is much simpler than the other 4 selection modes.
if (combineMode == CombineMode.Replace)
{
//Clear any previously stored Polygons.
doc.Selection.SelectionPolygons.Clear();
//Set the resulting selection path to the new selection path.
doc.Selection.SelectionPolygons = newPolygons;
doc.Selection.SelectionPath = g.CreatePolygonPath(polygonSet);
}
else
{
List <List <IntPoint> > resultingPolygons = new List <List <IntPoint> >();
//Specify the Clipper Subject (the previous Polygons) and the Clipper Clip (the new Polygons).
//Note: for Union, ignore the Clipper Library instructions - the new polygon(s) should be Clips, not Subjects!
doc.Selection.SelectionClipper.AddPolygons(doc.Selection.SelectionPolygons, PolyType.ptSubject);
doc.Selection.SelectionClipper.AddPolygons(newPolygons, PolyType.ptClip);
switch (combineMode)
{
case CombineMode.Xor:
//Xor means "Combine both Polygon sets, but leave out any areas of intersection between the two."
doc.Selection.SelectionClipper.Execute(ClipType.ctXor, resultingPolygons);
break;
case CombineMode.Exclude:
//Exclude == Difference
//Exclude/Difference means "Subtract any overlapping areas of the new Polygon set from the old Polygon set."
doc.Selection.SelectionClipper.Execute(ClipType.ctDifference, resultingPolygons);
break;
case CombineMode.Intersect:
//Intersect means "Leave only the overlapping areas between the new and old Polygon sets."
doc.Selection.SelectionClipper.Execute(ClipType.ctIntersection, resultingPolygons);
break;
default:
//Default should only be *CombineMode.Union*, but just in case...
//Union means "Combine both Polygon sets, and keep any overlapping areas as well."
doc.Selection.SelectionClipper.Execute(ClipType.ctUnion, resultingPolygons);
break;
}
//After using Clipper, it has to be cleared so there are no conflicts with its next usage.
doc.Selection.SelectionClipper.Clear();
//Set the resulting selection path to the calculated ("clipped") selection path.
doc.Selection.SelectionPolygons = resultingPolygons;
doc.Selection.SelectionPath = g.CreatePolygonPath(DocumentSelection.ConvertToPolygonSet(resultingPolygons));
}
}
doc.History.PushNewItem(undoAction);
doc.Workspace.Invalidate();
}