Exemplo n.º 1
0
        private void ExtractPath(Shape shape, int from, int to)
        {
            double factor = 2000.0;
            var winding = 0.0;

            int length = to - from;
            Point pa, pb;
            int a, b;

            var path = new Path();

            int i = 0;
            while (i <= length)
            {
                a = i;

                int j = i + 1;

                while (j <= length && (Flags[from + j] & GlyphFlag.OnCurve) != GlyphFlag.OnCurve)
                    j++;

                b = (j) % (length + 1);

                int padding = j - i;

                pa = new Point(Points[from + a].X / factor, Points[from + a].Y / factor);
                pb = new Point(Points[from + b].X / factor, Points[from + b].Y / factor);

                if(padding > 3)
                {
                    //TODO
                    var pc = new Point(Points[from + a + 1].X / factor, Points[from + a + 1].Y / factor);
                    path.AddPathSegment(new QuadraticCurveSegment(pa, pc, pb) { Convex = true });
                }
                else if(padding == 3)
                {
                    //TODO
                    var pc = new Point(Points[from + a + 1].X / factor, Points[from + a + 1].Y / factor);
                    path.AddPathSegment(new QuadraticCurveSegment(pa, pc, pb) { Convex = true });
                }
                else if(padding == 2)
                {
                    var pc = new Point(Points[from + a + 1].X / factor, Points[from + a + 1].Y / factor);
                    path.AddPathSegment(new QuadraticCurveSegment(pa, pc, pb) { Convex = true });
                }
                else
                {
                    path.AddPathSegment(new LineSegment(pa, pb));
                }

                winding += (pb.X - pa.X) * (pb.Y + pa.Y);

                i = j;
            }

            if (winding >= 0.0)
                path.CompositMode = CompositMode.Add;
            else
                path.CompositMode = CompositMode.Subtract;

            foreach(var segment in path.Segments)
            {
                if(segment is QuadraticCurveSegment)
                {
                    var qcs = segment as QuadraticCurveSegment;
                    var sign = Math.Sign(((qcs.End.X - qcs.Start.X) * (qcs.ControlPoint.Y - qcs.Start.Y)) - ((qcs.End.Y - qcs.Start.Y) * (qcs.ControlPoint.X - qcs.Start.X)));

                    if(path.CompositMode == CompositMode.Subtract)
                        qcs.Convex = sign >= 0.0 ? false : true;
                    else
                        qcs.Convex = sign >= 0.0 ? true : false;

                }
            }

            shape.AddPath(path);
        }
Exemplo n.º 2
0
 public void AddPath(Path path)
 {
     paths.Add(path);
 }
Exemplo n.º 3
0
 public void RemovePath(Path path)
 {
     paths.Remove(path);
 }
Exemplo n.º 4
0
        private static void AddPathToBuffers(Path path, BufferGenerator vertexBufferGenerator, BufferGenerator indexBufferGenerator, ref int indexCount)
        {
            List<PolygonPoint> points = new List<PolygonPoint>();

            float r;
            float g;
            float b;
            if (path.CompositMode == CompositMode.Subtract)
            {
                r = 1f;
                g = 0f;
                b = 0f;
            }
            else
            {
                r = 1f;
                g = 1f;
                b = 1f;
            }

            foreach (var segment in path.Segments)
            {
                if (segment is QuadraticCurveSegment)
                {
                    var quadraticCurveSegment = segment as QuadraticCurveSegment;
                    AddQuadraticCurveSegment(quadraticCurveSegment, points, vertexBufferGenerator, indexBufferGenerator, ref indexCount, r, g, b);
                }
                else if(segment is LineSegment)
                {
                    var lineSegment = segment as LineSegment;
                    points.Add(new PolygonPoint(lineSegment.End.X, lineSegment.End.Y));

                    var ext = 0.01;
                    var normal = path.CompositMode == CompositMode.Subtract ? lineSegment.RightNormal : lineSegment.LeftNormal;
                    var p1 = (normal * ext) + lineSegment.Start;
                    var p2 = (normal * ext) + lineSegment.End;

                    AddVertex(vertexBufferGenerator, (float)lineSegment.Start.X, (float)lineSegment.Start.Y, 0f, 1f, r, g, b, 1f);
                    AddVertex(vertexBufferGenerator, (float)lineSegment.End.X, (float)lineSegment.End.Y, 0f, 1f, r, g, b, 1f);
                    AddVertex(vertexBufferGenerator, (float)p1.X, (float)p1.Y, 1f, 1f, r, g, b, 1f);
                    indexBufferGenerator.WriteUInt((uint)indexCount++, (uint)indexCount++, (uint)indexCount++);

                    AddVertex(vertexBufferGenerator, (float)lineSegment.Start.X, (float)lineSegment.Start.Y, 0f, 1f, r, g, b, 1f);
                    AddVertex(vertexBufferGenerator, (float)p1.X, (float)p1.Y, 0f, 0f, r, g, b, 1f);
                    AddVertex(vertexBufferGenerator, (float)p2.X, (float)p2.Y, 1f, 1f, r, g, b, 1f);
                    indexBufferGenerator.WriteUInt((uint)indexCount++, (uint)indexCount++, (uint)indexCount++);
                }
                else
                {
                    throw new NotImplementedException();
                }
            }

            Polygon polygon;

            try
            {
                polygon = new Polygon(points);
                P2T.Triangulate(polygon);
            }
            catch(Exception e)
            {
                System.Diagnostics.Debug.WriteLine(e.Message);
                return;
            }

            foreach (var triangle in polygon.Triangles)
            {
                AddVertex(vertexBufferGenerator, (float)triangle.Points[0].X, (float)triangle.Points[0].Y, 0f, 1f, r, g, b, 1f);
                AddVertex(vertexBufferGenerator, (float)triangle.Points[1].X, (float)triangle.Points[1].Y, 0f, 1f, r, g, b, 1f);
                AddVertex(vertexBufferGenerator, (float)triangle.Points[2].X, (float)triangle.Points[2].Y, 0f, 1f, r, g, b, 1f);
                indexBufferGenerator.WriteUInt((uint)indexCount++, (uint)indexCount++, (uint)indexCount++);
            }
        }