public float[] BuildSmoothBorders(Figure[] figures, bool isClosedFigure, out int borderTriangleStripCount)
{
_expandCoords.Clear();
int total_b_triangleStripCount = 0;
for (int i = 0; i < figures.Length; ++i)
{
Figure fig = figures[i];
if (i == 0)
{
//first
BuildSmoothBorders(fig.coordXYs, fig.IsClosedFigure, _expandCoords, out int b_triangleStripCount);
total_b_triangleStripCount += b_triangleStripCount;
}
else
{
int latestCoordCount = _expandCoords.Count;
//add degenerative triangle
//for GLES30 consider=>GL_PRIMITIVE_RESTART_FIXED_INDEX
//see https://developer.apple.com/library/archive/documentation/3DDrawing/Conceptual/OpenGLES_ProgrammingGuide/TechniquesforWorkingwithVertexData/TechniquesforWorkingwithVertexData.html
//To merge two triangle strips, duplicate the last vertex of the first strip and the first vertex of the second strip,
//as shown in Figure 8-6. When this strip is submitted to OpenGL ES,
//triangles DEE, EEF, EFF, and FFG are considered degenerate and not processed or rasterized.
float prev_x = _expandCoords[latestCoordCount - 4];
float prev_y = _expandCoords[latestCoordCount - 3];
float prev_z = _expandCoords[latestCoordCount - 2];
float prev_w = _expandCoords[latestCoordCount - 1];
_expandCoords.Add(prev_x);
_expandCoords.Add(prev_y);
_expandCoords.Add(prev_z);
_expandCoords.Add(prev_w);
latestCoordCount += 4;//***
//since we use a single coord
//preserve space (4 coords) for degenerative triangles
//(see restore later)
_expandCoords.Add(0);
_expandCoords.Add(0);
_expandCoords.Add(0);
_expandCoords.Add(0);
//-----
BuildSmoothBorders(fig.coordXYs, fig.IsClosedFigure, _expandCoords, out int b_triangleStripCount);
//-----
//restore- 4 coord of latest expandCoords set
_expandCoords[latestCoordCount] = _expandCoords[latestCoordCount + 4];
_expandCoords[latestCoordCount + 1] = _expandCoords[latestCoordCount + 5];
_expandCoords[latestCoordCount + 2] = _expandCoords[latestCoordCount + 6];
_expandCoords[latestCoordCount + 3] = _expandCoords[latestCoordCount + 7];
total_b_triangleStripCount += b_triangleStripCount + 1; //*** +1 for a degenerative triangle
}
}
borderTriangleStripCount = total_b_triangleStripCount;
float[] result = _expandCoords.ToArray();
_expandCoords.Clear();
//
return(result);
}
public FigureContainer(MultiFigures multiFig)
{
_figure = null;
_multiFig = multiFig;
}
public FigureContainer(Figure fig)
{
_figure = fig;
_multiFig = null;
}
public float[] GetAreaTess(TessTool tess, Tesselate.Tesselator.WindingRuleType windingRuleType, TessTriangleTechnique tessTechnique)
{
#if DEBUG
if (this.TessTriangleTech == 0)
{
}
#endif
if (TessTriangleTech != tessTechnique)
{
//re tess again
this.TessTriangleTech = tessTechnique;
//***
using (ReusableCoordList.Borrow(out ReusableCoordList resuableCoordList))
{
ArrayList <float> coordXYs = resuableCoordList._coordXYs;
ArrayList <int> contourEndPoints = resuableCoordList._contourEndPoints;
Figure fig = null;
for (int i = 0; i < _figures.Length; ++i)
{
fig = _figures[i];
coordXYs.Append(fig.coordXYs);
if (fig.IsClosedFigure)
{
//for tess,if close figure
coordXYs.Append(fig.coordXYs[0]);
coordXYs.Append(fig.coordXYs[1]);
}
contourEndPoints.Append(coordXYs.Count - 1);
}
if (this.TessTriangleTech == TessTriangleTechnique.DrawArray)
{
tess.WindingRuleType = windingRuleType;
return(_areaTess = tess.TessAsTriVertexArray(
coordXYs.ToArray(),
contourEndPoints.ToArray(),
out _tessAreaVertexCount));
}
else
{
tess.WindingRuleType = windingRuleType;
_areaTessIndexList = tess.TessAsTriIndexArray(
coordXYs.ToArray(),
contourEndPoints.ToArray(),
out _areaTess,
out _tessAreaVertexCount);
return(_areaTess);
}
}
}
else
{
//if equal
return(_areaTess);
}
}
public void PreparePolygons(Figure fig, List <Poly2Tri.Polygon> outputPolyons)
{
PreparePolygons(fig.coordXYs, outputPolyons);
}
public FigureContainer Build(PixelFarm.Drawing.VertexStore vxs)
{
//vxs must be flatten vxs.
#if DEBUG
double prevX = 0;
double prevY = 0;
#endif
double prevMoveToX = 0;
double prevMoveToY = 0;
_xylist.Clear();
_figs.Clear();
//TODO: reivew here
//about how to reuse this list
//result...
RectBoundsAccum rectBoundsAccum = new RectBoundsAccum();
rectBoundsAccum.Init();
int index = 0;
VertexCmd cmd;
while ((cmd = vxs.GetVertex(index++, out double x, out double y)) != VertexCmd.NoMore)
{
switch (cmd)
{
case VertexCmd.MoveTo:
#if DEBUG
prevX = x;
prevY = y;
#endif
prevMoveToX = x;
prevMoveToY = y;
_xylist.Add((float)x);
_xylist.Add((float)y);
rectBoundsAccum.Update(x, y);
break;
case VertexCmd.LineTo:
_xylist.Add((float)x);
_xylist.Add((float)y);
#if DEBUG
prevX = x;
prevY = y;
#endif
rectBoundsAccum.Update(x, y);
break;
case VertexCmd.Close:
{
//don't add
//_xylist.Add((float)prevMoveToX);
//_xylist.Add((float)prevMoveToY);
#if DEBUG
prevX = prevMoveToX;
prevY = prevMoveToY;
#endif
//-----------
Figure newfig = new Figure(_xylist.ToArray(), rectBoundsAccum.ToRectF());
newfig.IsClosedFigure = true;
_figs.Add(newfig);
//-----------
_xylist.Clear(); //clear temp list
rectBoundsAccum.Init();
}
break;
case VertexCmd.NoMore:
goto EXIT_LOOP;
default:
throw new System.NotSupportedException();
}
}
EXIT_LOOP:
if (_figs.Count == 0)
{
Figure newfig = new Figure(_xylist.ToArray(), rectBoundsAccum.ToRectF());
newfig.IsClosedFigure = false;
return(new FigureContainer(newfig));
}
//
if (_xylist.Count > 1)
{
#if DEBUG
prevX = prevMoveToX;
prevY = prevMoveToY;
#endif
//
Figure newfig = new Figure(_xylist.ToArray(), rectBoundsAccum.ToRectF());
newfig.IsClosedFigure = true; //?
_figs.Add(newfig);
}
if (_figs.Count == 1)
{
Figure fig = _figs[0];
_figs.Clear();
return(new FigureContainer(fig));
}
else
{
MultiFigures multiFig = new MultiFigures(_figs.ToArray());
_figs.Clear();
return(new FigureContainer(multiFig));
}
}