private static IPolygon Clopening(IPolygon p, Box2 boundingBox, double offset)
{
if (p.IsEmpty)
{
return(Polygon.Empty);
}
double scale = Math.Max(boundingBox.Width, boundingBox.Height);
var fixedPointRange = new Box2(boundingBox.MinCorner, new Vector2(scale, scale));
var fixedP = ConvertToFixedPoint(p, fixedPointRange);
var fixedScaleOffset = offset * _fixedPointRange / scale;
try
{
var offsetter = new ClipperOffset();
offsetter.AddPaths(fixedP, JoinType.jtMiter, EndType.etClosedPolygon);
var fixedIntermediate = new ClipperPolygon();
offsetter.Execute(ref fixedIntermediate, fixedScaleOffset);
offsetter.Clear();
offsetter.AddPaths(fixedIntermediate, JoinType.jtMiter, EndType.etClosedPolygon);
var fixedAnswer = new ClipperPolygon();
offsetter.Execute(ref fixedAnswer, -fixedScaleOffset);
return(ConvertToFloatingPoint(fixedAnswer, fixedPointRange));
}
catch (Exception e)
{
Console.WriteLine("EXCEPTION: {0}", e);
return(p);
}
}
public static IPolygon Offset(this IPolygon p, double offset)
{
if (p.IsEmpty)
{
return(Polygon.Empty);
}
var boundingBox = p.BoundingBox().Offset(Math.Max(offset, 0));
double scale = Math.Max(boundingBox.Width, boundingBox.Height);
var fixedPointRange = new Box2(boundingBox.MinCorner, new Vector2(scale, scale));
var fixedP = ConvertToFixedPoint(p, fixedPointRange);
try
{
var offsetter = new ClipperOffset();
offsetter.AddPaths(fixedP, JoinType.jtMiter, EndType.etClosedPolygon);
var fixedAnswer = new ClipperPolygon();
offsetter.Execute(ref fixedAnswer, offset * _fixedPointRange / scale);
return(ConvertToFloatingPoint(fixedAnswer, fixedPointRange));
}
catch (Exception e)
{
Console.WriteLine("EXCEPTION: {0}", e);
return(p);
}
}
private static IPolygon BinaryOperation(IPolygon p, IPolygon q, ClipType operationType)
{
if (p.IsEmpty && q.IsEmpty)
{
return(Polygon.Empty);
}
var boundingBox = Box2.Hull(p.BoundingBox(), q.BoundingBox());
var fixedP = ConvertToFixedPoint(p, boundingBox);
var fixedQ = ConvertToFixedPoint(q, boundingBox);
try
{
var clipper = new Clipper();
clipper.AddPaths(fixedP, PolyType.ptSubject, closed: true);
clipper.AddPaths(fixedQ, PolyType.ptClip, closed: true);
var fixedAnswer = new ClipperPolygon();
clipper.Execute(operationType, fixedAnswer);
return(ConvertToFloatingPoint(fixedAnswer, boundingBox));
}
catch (Exception e)
{
Console.WriteLine("EXCEPTION: {0}", e);
return(Polygon.Empty);
}
}
private static IPolygon ConvertToFloatingPoint(ClipperPolygon p, Box2 range)
{
var answer = new PolygonBuilder();
foreach (var clipContour in p)
{
var contour = clipContour.Select(v => ConvertToFloatingPoint(v, range)).ToList();
answer.AddContour(contour);
}
return(answer.ExtractPolygon());
}
private static IPolygon MultinaryOperation(IEnumerable <IPolygon> polygons, ClipType operationType)
{
var boundingBox = Box2.Hull(polygons.Select(p => p.BoundingBox()));
if (boundingBox.IsEmpty)
{
return(Polygon.Empty);
}
var first = polygons.First();
var rest = polygons.Skip(1);
if (!rest.Any())
{
return(first);
}
var fixedAnswer = ConvertToFixedPoint(first, boundingBox);
foreach (var p in rest)
{
var fixedP = ConvertToFixedPoint(p, boundingBox);
try
{
var clipper = new Clipper();
clipper.AddPaths(fixedAnswer, PolyType.ptSubject, closed: true);
clipper.AddPaths(fixedP, PolyType.ptClip, closed: true);
var tempAnswer = new ClipperPolygon();
clipper.Execute(operationType, tempAnswer);
fixedAnswer = tempAnswer;
}
catch (Exception e)
{
Console.WriteLine("EXCEPTION: {0}", e);
}
}
return(ConvertToFloatingPoint(fixedAnswer, boundingBox));
}
public static IPolygon MinkowskiDifference(IPolygon p, IPolygon q)
{
if (p.IsEmpty || q.IsEmpty)
{
return(Polygon.Empty);
}
var boundingBox = Box2.Hull(p.BoundingBox(), q.BoundingBox());
boundingBox = Box2.Hull(boundingBox, new Box2(-boundingBox.MaxCorner, boundingBox.Dimensions));
var fixedAnswer = new ClipperPolygon();
var fixedP = ConvertToFixedPoint(p, boundingBox);
foreach (var qContour in q.Contours)
{
var fixedQContour = MinusConvertToFixedPoint(qContour, boundingBox);
try
{
var clipper = new Clipper();
clipper.AddPaths(fixedAnswer, PolyType.ptSubject, closed: true);
clipper.AddPaths(Clipper.MinkowskiSum(fixedQContour, fixedP, pathIsClosed: true), PolyType.ptClip, closed: true);
var tempAnswer = new ClipperPolygon();
clipper.Execute(ClipType.ctUnion, tempAnswer);
fixedAnswer = tempAnswer;
}
catch (Exception e)
{
Console.WriteLine("EXCEPTION: {0}", e);
}
}
return(ConvertToFloatingPoint(fixedAnswer, boundingBox));
}
public static List <List <Point> > DecomposeNonSimplePolygon(List <Point> points)
{
List <List <Point> > result = new List <List <Point> >();
ClipperPolygon polygon = new ClipperPolygon();
foreach (Point point in points)
{
IntPoint intPoint = new IntPoint(point.X, point.Y);
polygon.Add(intPoint);
}
ClipperPolygons polygons = Clipper.SimplifyPolygon(polygon, PolyFillType.pftEvenOdd);
foreach (List <IntPoint> item in polygons)
{
List <Point> pointList = new List <Point>();
foreach (IntPoint subitem in item)
{
pointList.Add(new Point((int)subitem.X, (int)subitem.Y));
}
result.Add(pointList);
}
return(result);
}
public static ClipperLib.PolyTree ExecuteClipper(TmxMap tmxMap, TmxLayer tmxLayer, TransformPointFunc xfFunc, ProgressFunc progFunc)
{
// The "fullClipper" combines the clipper results from the smaller pieces
ClipperLib.Clipper fullClipper = new ClipperLib.Clipper();
// From the perspective of Clipper lines are polygons too
// Closed paths == polygons
// Open paths == lines
var polygonGroups = from y in Enumerable.Range(0, tmxLayer.Height)
from x in Enumerable.Range(0, tmxLayer.Width)
let rawTileId = tmxLayer.GetRawTileIdAt(x, y)
let tileId = TmxMath.GetTileIdWithoutFlags(rawTileId)
where tileId != 0
let tile = tmxMap.Tiles[tileId]
from polygon in tile.ObjectGroup.Objects
where (polygon as TmxHasPoints) != null
let groupX = x / LayerClipper.GroupBySize
let groupY = y / LayerClipper.GroupBySize
group new
{
PositionOnMap = tmxMap.GetMapPositionAt(x, y, tile),
HasPointsInterface = polygon as TmxHasPoints,
TmxObjectInterface = polygon,
IsFlippedDiagnoally = TmxMath.IsTileFlippedDiagonally(rawTileId),
IsFlippedHorizontally = TmxMath.IsTileFlippedHorizontally(rawTileId),
IsFlippedVertically = TmxMath.IsTileFlippedVertically(rawTileId),
TileCenter = new PointF(tile.TileSize.Width * 0.5f, tile.TileSize.Height * 0.5f),
}
by Tuple.Create(groupX, groupY);
int groupIndex = 0;
int groupCount = polygonGroups.Count();
foreach (var polyGroup in polygonGroups)
{
if (groupIndex % 5 == 0)
{
progFunc(String.Format("Clipping '{0}' polygons: {1}%", tmxLayer.Name, (groupIndex / (float)groupCount) * 100));
}
groupIndex++;
// The "groupClipper" clips the polygons in a smaller part of the world
ClipperLib.Clipper groupClipper = new ClipperLib.Clipper();
// Add all our polygons to the Clipper library so it can reduce all the polygons to a (hopefully small) number of paths
foreach (var poly in polyGroup)
{
// Create a clipper library polygon out of each and add it to our collection
ClipperPolygon clipperPolygon = new ClipperPolygon();
// Our points may be transformed due to tile flipping/rotation
// Before we transform them we put all the points into local space relative to the tile
SizeF offset = new SizeF(poly.TmxObjectInterface.Position);
PointF[] transformedPoints = poly.HasPointsInterface.Points.Select(pt => PointF.Add(pt, offset)).ToArray();
// Now transform the points relative to the tile
TmxMath.TransformPoints(transformedPoints, poly.TileCenter, poly.IsFlippedDiagnoally, poly.IsFlippedHorizontally, poly.IsFlippedVertically);
foreach (var pt in transformedPoints)
{
float x = poly.PositionOnMap.X + pt.X;
float y = poly.PositionOnMap.Y + pt.Y;
ClipperLib.IntPoint point = xfFunc(x, y);
clipperPolygon.Add(point);
}
// Because of Unity's cooridnate system, the winding order of the polygons must be reversed
clipperPolygon.Reverse();
// Add the "subject"
groupClipper.AddPath(clipperPolygon, ClipperLib.PolyType.ptSubject, poly.HasPointsInterface.ArePointsClosed());
}
// Get a solution for this group
ClipperLib.PolyTree solution = new ClipperLib.PolyTree();
groupClipper.Execute(ClipperLib.ClipType.ctUnion, solution, LayerClipper.SubjectFillRule, LayerClipper.ClipFillRule);
// Combine the solutions into the full clipper
fullClipper.AddPaths(ClipperLib.Clipper.ClosedPathsFromPolyTree(solution), ClipperLib.PolyType.ptSubject, true);
fullClipper.AddPaths(ClipperLib.Clipper.OpenPathsFromPolyTree(solution), ClipperLib.PolyType.ptSubject, false);
}
progFunc(String.Format("Clipping '{0}' polygons: 100%", tmxLayer.Name));
ClipperLib.PolyTree fullSolution = new ClipperLib.PolyTree();
fullClipper.Execute(ClipperLib.ClipType.ctUnion, fullSolution, LayerClipper.SubjectFillRule, LayerClipper.ClipFillRule);
return(fullSolution);
}
public static ClipperLib.PolyTree ExecuteClipper(TmxMap tmxMap, TmxLayer tmxLayer, TransformPointFunc xfFunc, ProgressFunc progFunc)
{
// The "fullClipper" combines the clipper results from the smaller pieces
ClipperLib.Clipper fullClipper = new ClipperLib.Clipper();
// Limit to polygon "type" that matches the collision layer name (unless we are overriding the whole layer to a specific Unity Layer Name)
bool usingUnityLayerOverride = !String.IsNullOrEmpty(tmxLayer.UnityLayerOverrideName);
// From the perspective of Clipper lines are polygons too
// Closed paths == polygons
// Open paths == lines
Dictionary <TupleInt2, List <PolygonGroup> > polygonGroups = new Dictionary <TupleInt2, List <PolygonGroup> >();
foreach (int y in Enumerable.Range(0, tmxLayer.Height))
{
foreach (int x in Enumerable.Range(0, tmxLayer.Width))
{
uint rawTileId = tmxLayer.GetRawTileIdAt(x, y);
if (rawTileId == 0)
{
continue;
}
uint tileId = TmxMath.GetTileIdWithoutFlags(rawTileId);
TmxTile tile = tmxMap.Tiles[tileId];
foreach (TmxObject polygon in tile.ObjectGroup.Objects)
{
if (typeof(TmxHasPoints).IsAssignableFrom(polygon.GetType()) &&
(usingUnityLayerOverride || String.Compare(polygon.Type, tmxLayer.Name, true) == 0))
{
int groupX = x / LayerClipper.GroupBySize;
int groupY = y / LayerClipper.GroupBySize;
PolygonGroup poly = new PolygonGroup();
poly.PositionOnMap = tmxMap.GetMapPositionAt(x, y, tile);
poly.HasPointsInterface = polygon as TmxHasPoints;
poly.TmxObjectInterface = polygon;
poly.IsFlippedDiagnoally = TmxMath.IsTileFlippedDiagonally(rawTileId);
poly.IsFlippedHorizontally = TmxMath.IsTileFlippedHorizontally(rawTileId);
poly.IsFlippedVertically = TmxMath.IsTileFlippedVertically(rawTileId);
poly.TileCenter = new PointF(tile.TileSize.Width * 0.5f, tile.TileSize.Height * 0.5f);
TupleInt2 key = new TupleInt2(groupX, groupY);
if (!polygonGroups.ContainsKey(key))
{
polygonGroups[key] = new List <PolygonGroup>();
}
polygonGroups[key].Add(poly);
}
}
}
}
// Tuple not supported in Mono 2.0 so doing this the old fashioned way, sorry
//var polygonGroups = from y in Enumerable.Range(0, tmxLayer.Height)
// from x in Enumerable.Range(0, tmxLayer.Width)
// let rawTileId = tmxLayer.GetRawTileIdAt(x, y)
// where rawTileId != 0
// let tileId = TmxMath.GetTileIdWithoutFlags(rawTileId)
// let tile = tmxMap.Tiles[tileId]
// from polygon in tile.ObjectGroup.Objects
// where (polygon as TmxHasPoints) != null
// where usingUnityLayerOverride || String.Compare(polygon.Type, tmxLayer.Name, true) == 0
// let groupX = x / LayerClipper.GroupBySize
// let groupY = y / LayerClipper.GroupBySize
// group new
// {
// PositionOnMap = tmxMap.GetMapPositionAt(x, y, tile),
// HasPointsInterface = polygon as TmxHasPoints,
// TmxObjectInterface = polygon,
// IsFlippedDiagnoally = TmxMath.IsTileFlippedDiagonally(rawTileId),
// IsFlippedHorizontally = TmxMath.IsTileFlippedHorizontally(rawTileId),
// IsFlippedVertically = TmxMath.IsTileFlippedVertically(rawTileId),
// TileCenter = new PointF(tile.TileSize.Width * 0.5f, tile.TileSize.Height * 0.5f),
// }
// by Tuple.Create(groupX, groupY);
int groupIndex = 0;
int groupCount = polygonGroups.Count();
foreach (TupleInt2 key in polygonGroups.Keys)
{
if (groupIndex % 5 == 0)
{
progFunc(String.Format("Clipping '{0}' polygons: {1}%", tmxLayer.Name, (groupIndex / (float)groupCount) * 100));
}
groupIndex++;
// The "groupClipper" clips the polygons in a smaller part of the world
ClipperLib.Clipper groupClipper = new ClipperLib.Clipper();
// Add all our polygons to the Clipper library so it can reduce all the polygons to a (hopefully small) number of paths
foreach (PolygonGroup poly in polygonGroups[key])
{
// Create a clipper library polygon out of each and add it to our collection
ClipperPolygon clipperPolygon = new ClipperPolygon();
// Our points may be transformed due to tile flipping/rotation
// Before we transform them we put all the points into local space relative to the tile
SizeF offset = new SizeF(poly.TmxObjectInterface.Position);
PointF[] transformedPoints = poly.HasPointsInterface.Points.Select(pt => PointF.Add(pt, offset)).ToArray();
// Now transform the points relative to the tile
TmxMath.TransformPoints(transformedPoints, poly.TileCenter, poly.IsFlippedDiagnoally, poly.IsFlippedHorizontally, poly.IsFlippedVertically);
foreach (var pt in transformedPoints)
{
float x = poly.PositionOnMap.X + pt.X;
float y = poly.PositionOnMap.Y + pt.Y;
ClipperLib.IntPoint point = xfFunc(x, y);
clipperPolygon.Add(point);
}
// Because of Unity's cooridnate system, the winding order of the polygons must be reversed
clipperPolygon.Reverse();
// Add the "subject"
groupClipper.AddPath(clipperPolygon, ClipperLib.PolyType.ptSubject, poly.HasPointsInterface.ArePointsClosed());
}
// Get a solution for this group
ClipperLib.PolyTree solution = new ClipperLib.PolyTree();
groupClipper.Execute(ClipperLib.ClipType.ctUnion, solution, LayerClipper.SubjectFillRule, LayerClipper.ClipFillRule);
// Combine the solutions into the full clipper
fullClipper.AddPaths(ClipperLib.Clipper.ClosedPathsFromPolyTree(solution), ClipperLib.PolyType.ptSubject, true);
fullClipper.AddPaths(ClipperLib.Clipper.OpenPathsFromPolyTree(solution), ClipperLib.PolyType.ptSubject, false);
}
progFunc(String.Format("Clipping '{0}' polygons: 100%", tmxLayer.Name));
ClipperLib.PolyTree fullSolution = new ClipperLib.PolyTree();
fullClipper.Execute(ClipperLib.ClipType.ctUnion, fullSolution, LayerClipper.SubjectFillRule, LayerClipper.ClipFillRule);
return(fullSolution);
}
public static ClipperLib.PolyTree ExecuteClipper(TmxMap tmxMap, TmxLayer tmxLayer, TransformPointFunc xfFunc, ProgressFunc progFunc)
{
// The "fullClipper" combines the clipper results from the smaller pieces
ClipperLib.Clipper fullClipper = new ClipperLib.Clipper();
// From the perspective of Clipper lines are polygons too
// Closed paths == polygons
// Open paths == lines
var polygonGroups = from y in Enumerable.Range(0, tmxLayer.Height)
from x in Enumerable.Range(0, tmxLayer.Width)
let rawTileId = tmxLayer.GetRawTileIdAt(x, y)
let tileId = TmxMath.GetTileIdWithoutFlags(rawTileId)
where tileId != 0
let tile = tmxMap.Tiles[tileId]
from polygon in tile.ObjectGroup.Objects
where (polygon as TmxHasPoints) != null
let groupX = x / LayerClipper.GroupBySize
let groupY = y / LayerClipper.GroupBySize
group new
{
PositionOnMap = tmxMap.GetMapPositionAt(x, y, tile),
HasPointsInterface = polygon as TmxHasPoints,
TmxObjectInterface = polygon,
IsFlippedDiagnoally = TmxMath.IsTileFlippedDiagonally(rawTileId),
IsFlippedHorizontally = TmxMath.IsTileFlippedHorizontally(rawTileId),
IsFlippedVertically = TmxMath.IsTileFlippedVertically(rawTileId),
TileCenter = new PointF(tile.TileSize.Width * 0.5f, tile.TileSize.Height * 0.5f),
}
by Tuple.Create(groupX, groupY);
int groupIndex = 0;
int groupCount = polygonGroups.Count();
foreach (var polyGroup in polygonGroups)
{
if (groupIndex % 5 == 0)
{
progFunc(String.Format("Clipping '{0}' polygons: {1}%", tmxLayer.Name, (groupIndex / (float)groupCount) * 100));
}
groupIndex++;
// The "groupClipper" clips the polygons in a smaller part of the world
ClipperLib.Clipper groupClipper = new ClipperLib.Clipper();
// Add all our polygons to the Clipper library so it can reduce all the polygons to a (hopefully small) number of paths
foreach (var poly in polyGroup)
{
// Create a clipper library polygon out of each and add it to our collection
ClipperPolygon clipperPolygon = new ClipperPolygon();
// Our points may be transformed due to tile flipping/rotation
// Before we transform them we put all the points into local space relative to the tile
SizeF offset = new SizeF(poly.TmxObjectInterface.Position);
PointF[] transformedPoints = poly.HasPointsInterface.Points.Select(pt => PointF.Add(pt, offset)).ToArray();
// Now transform the points relative to the tile
TmxMath.TransformPoints(transformedPoints, poly.TileCenter, poly.IsFlippedDiagnoally, poly.IsFlippedHorizontally, poly.IsFlippedVertically);
foreach (var pt in transformedPoints)
{
float x = poly.PositionOnMap.X + pt.X;
float y = poly.PositionOnMap.Y + pt.Y;
ClipperLib.IntPoint point = xfFunc(x, y);
clipperPolygon.Add(point);
}
// Because of Unity's cooridnate system, the winding order of the polygons must be reversed
clipperPolygon.Reverse();
// Add the "subject"
groupClipper.AddPath(clipperPolygon, ClipperLib.PolyType.ptSubject, poly.HasPointsInterface.ArePointsClosed());
}
// Get a solution for this group
ClipperLib.PolyTree solution = new ClipperLib.PolyTree();
groupClipper.Execute(ClipperLib.ClipType.ctUnion, solution, LayerClipper.SubjectFillRule, LayerClipper.ClipFillRule);
// Combine the solutions into the full clipper
fullClipper.AddPaths(ClipperLib.Clipper.ClosedPathsFromPolyTree(solution), ClipperLib.PolyType.ptSubject, true);
fullClipper.AddPaths(ClipperLib.Clipper.OpenPathsFromPolyTree(solution), ClipperLib.PolyType.ptSubject, false);
}
progFunc(String.Format("Clipping '{0}' polygons: 100%", tmxLayer.Name));
ClipperLib.PolyTree fullSolution = new ClipperLib.PolyTree();
fullClipper.Execute(ClipperLib.ClipType.ctUnion, fullSolution, LayerClipper.SubjectFillRule, LayerClipper.ClipFillRule);
return fullSolution;
}
