public double GetArea()
{
double[] co1 = World.GetVertexCoord(VertexCoordIds[0]);
double[] co2 = World.GetVertexCoord(VertexCoordIds[1]);
double[] co3 = World.GetVertexCoord(VertexCoordIds[2]);
OpenTK.Vector2d v1 = new OpenTK.Vector2d(co1[0], co1[1]);
OpenTK.Vector2d v2 = new OpenTK.Vector2d(co2[0], co2[1]);
OpenTK.Vector2d v3 = new OpenTK.Vector2d(co3[0], co3[1]);
double area = CadUtils.TriArea(v1, v2, v3);
return(area);
}
public void CalcTransMatrix(out double[] a, out double[] b, out double[] c)
{
a = new double[3];
b = new double[3];
c = new double[3];
double[] co1 = World.GetVertexCoord(VertexCoordIds[0]);
double[] co2 = World.GetVertexCoord(VertexCoordIds[1]);
double[] co3 = World.GetVertexCoord(VertexCoordIds[2]);
OpenTK.Vector2d v1 = new OpenTK.Vector2d(co1[0], co1[1]);
OpenTK.Vector2d v2 = new OpenTK.Vector2d(co2[0], co2[1]);
OpenTK.Vector2d v3 = new OpenTK.Vector2d(co3[0], co3[1]);
double A = CadUtils.TriArea(v1, v2, v3);
OpenTK.Vector2d[] v = { v1, v2, v3 };
for (int k = 0; k < 3; k++)
{
int l = (k + 1) % 3;
int m = (k + 2) % 3;
a[k] = (1.0 / (2.0 * A)) * (v[l].X * v[m].Y - v[m].X * v[l].Y);
b[k] = (1.0 / (2.0 * A)) * (v[l].Y - v[m].Y);
c[k] = (1.0 / (2.0 * A)) * (v[m].X - v[l].X);
}
}
public bool DragArc(uint eId, OpenTK.Vector2d vec)
{
if (!IsElementId(CadElementType.Edge, eId))
{
return(false);
}
if (GetEdgeCurveType(eId) != CurveType.CurveArc)
{
return(true);
}
bool oldIsLeftSide;
double oldDist;
{
Edge2D e = GetEdge(eId);
e.GetCurveArc(out oldIsLeftSide, out oldDist);
}
Edge2D edge = GetEdge(eId);
System.Diagnostics.Debug.Assert(edge.CurveType == CurveType.CurveArc);
{
OpenTK.Vector2d sPt = edge.GetVertex(true);
OpenTK.Vector2d ePt = edge.GetVertex(false);
double edgeLen = Math.Sqrt(CadUtils.SquareLength(sPt, ePt));
if (Math.Abs(CadUtils.TriHeight(vec, sPt, ePt)) > edgeLen * 0.02)
{
OpenTK.Vector2d cPt;
bool ret = CadUtils.CenterCircumcircle(sPt, ePt, vec, out cPt);
System.Diagnostics.Debug.Assert(ret);
double dist = CadUtils.TriHeight(cPt, sPt, ePt);
double distRatio = dist / edgeLen;
edge.SetCurveArc(CadUtils.TriArea(sPt, ePt, vec) > 0, distRatio);
}
else
{
return(true);
}
}
HashSet <uint> setLId = new HashSet <uint>();
for (VertexEdgeItr vItr = this.BRep.GetVertexEdgeItr(edge.GetVertexId(true)); !vItr.IsEnd(); vItr++)
{
uint tmpLId = vItr.GetLoopId();
if (!setLId.Contains(tmpLId))
{
setLId.Add(tmpLId);
}
}
for (VertexEdgeItr vItr = this.BRep.GetVertexEdgeItr(edge.GetVertexId(false)); !vItr.IsEnd(); vItr++)
{
uint tmpLId = vItr.GetLoopId();
if (!setLId.Contains(tmpLId))
{
setLId.Add(tmpLId);
}
}
foreach (uint lId in setLId)
{
if (!this.BRep.IsElementId(CadElementType.Loop, lId))
{
continue;
}
if (CheckLoop(lId) != 0)
{
// fail
edge.SetCurveArc(oldIsLeftSide, oldDist);
return(true);
}
}
return(true);
}
