private int AddVertex(Vertex v)
{
int index = 0;
if (linechangedvertices.Count != 0)
{
index = linechangedvertices.Dequeue();
_vbo.SetVertex(index, v);
}
if (availablevertices.Count != 0)
{
index = availablevertices.Dequeue();
_vbo.SetVertex(index, v);
}
else
{
index = _vbo.AddVertex(v);
}
return(index);
}
public void DrawPath(Path path, VBO vbo)
{
List <List <Vector2> > shapes = new List <List <Vector2> >();
List <Vector2> positions = new List <Vector2>();
List <Vector2> tesselated = new List <Vector2>();
Point position = new Point();
foreach (var op in path.Operations)
{
var mt = op as MoveTo;
if (mt != null)
{
shapes.Add(positions);
positions = new List <Vector2>();
positions.Add(Vec2(mt.Point));
position = mt.Point;
continue;
}
var lt = op as LineTo;
if (lt != null)
{
positions.Add(Vec2(lt.Point));
position = lt.Point;
continue;
}
var at = op as ArcTo;
if (at != null)
{
var p = nsvg.nsvg__pathArcTo((Vector2d)Vec2(position), at);
positions.AddRange(p);
position = at.Point;
continue;
}
var ct = op as CurveTo;
if (ct != null)
{
if (double.IsNaN(ct.Control1.X) && double.IsNaN(ct.Control1.Y))
{
BezierCurveQuadric b = new BezierCurveQuadric(Vec2(position), Vec2(ct.EndPoint),
Vec2(ct.Control2));
Vector2 old = b.CalculatePoint(0f);
positions.Add(old);
var precision = 0.05f;
for (float i = precision; i < 1f + precision; i += precision)
{
Vector2 j = b.CalculatePoint(i);
positions.Add(j);
old = j;
}
}
else
{
BezierCurveCubic b = new BezierCurveCubic(Vec2(position), Vec2(ct.EndPoint), Vec2(ct.Control1),
Vec2(ct.Control2));
Vector2 old = b.CalculatePoint(0f);
positions.Add(old);
var precision = 0.05f;
for (float i = precision; i < 1f + precision; i += precision)
{
Vector2 j = b.CalculatePoint(i);
positions.Add(j);
}
}
position = ct.EndPoint;
}
var cp = op as ClosePath;
if (cp != null)
{
if (positions.Count > 0)
{
positions.Add(positions[0]);
shapes.Add(positions);
}
positions = new List <Vector2>();
position = new Point();
continue;
}
}
shapes.Add(positions);
brushcheck(path.Brush);
LibTessDotNet.Tess t = new LibTessDotNet.Tess();
List <Vec3> vertices = new List <Vec3>();
foreach (var s in shapes)
{
ContourVertex[] cv = new ContourVertex[s.Count];
for (int i = 0; i < s.Count; i++)
{
var v = s[i];
cv[i] = new ContourVertex()
{
Position = new Vec3()
{
X = v.X, Y = v.Y
}
};
}
t.AddContour(cv);
}
var rule = LibTessDotNet.WindingRule.NonZero;
if (path.Brush != null)
{
rule = path.Brush.FillMode == FillMode.EvenOdd ? LibTessDotNet.WindingRule.EvenOdd : LibTessDotNet.WindingRule.NonZero;
}
t.Tessellate(rule, LibTessDotNet.ElementType.Polygons, 3);
for (var i = 0; i < t.ElementCount; i++)
{
for (var tri = 0; tri < 3; tri++)
{
vertices.Add(t.Vertices[t.Elements[(i * 3) + tri]].Position);
}
}
for (int i = 0; i < vertices.Count; i++)
{
tesselated.Add(new Vector2(vertices[i].X, vertices[i].Y));
}
var lineshapes = new List <List <Vector2> >();
foreach (var s in shapes)
{
if (s.Count == 0)
{
continue;
}
List <Vector2> add = new List <Vector2>();
for (int i = 0; i < s.Count; i++)
{
add.Add(new Vector2(s[i].X, s[i].Y));
}
lineshapes.Add(add);
}
if (path.Brush is SolidBrush || path.Pen != null)
{
if (path.Brush is SolidBrush)
{
var sb = path.Brush as SolidBrush;
for (int i = 0; i < tesselated.Count; i++)
{
vbo.AddVertex(new Vertex(tesselated[i], color(sb.Color)));
}
}
if (path.Pen != null)
{
foreach (var list in lineshapes)
{
foreach (var v in TesselateLines(list, path.Pen))
{
vbo.AddVertex(v);
}
}
}
}
}