bool CMesh::TVertex::CheckMaterialAtEdge(TVertex *pVert0, TVertex *pVert1)
{
// Parameters specify a new edge that will form after the removal of the current vertex
// This function finds intersections of triangle edges that fan out of the vertex being removed
// with the new edge, and makes sure interpolated material stays the same at the intersection points
// This makes sure the vertex removal will not cause material change in the area of any of the changed triangles
int iTri, i;
TTriangle *pTri;
TVertex *pOther[2];
CVector<2> vEdge0, vEdge1, vThis, vOther;
float fTEdge, fTOther, fME0, fME1, fMOther, fME, fMOtherMid;
vEdge0.Set(pVert0->m_vCoord);
vEdge1.Set(pVert1->m_vCoord);
vThis.Set(m_vCoord);
fME0 = (pVert0->m_iMaterial == m_iMaterial);
fME1 = (pVert1->m_iMaterial == m_iMaterial);
for (iTri = 0; iTri < m_pTriangles->m_iCount; iTri++) {
pTri = m_pTriangles->At(iTri);
pTri->GetOtherVertices(this, pOther[0], pOther[1]);
for (i = 0; i < 2; i++) {
vOther.Set(pOther[i]->m_vCoord);
if (!IntersectSegments(vEdge0, vEdge1, vThis, vOther, fTEdge, fTOther))
continue;
fMOther = (pOther[i]->m_iMaterial == m_iMaterial);
fME = fME0 + (fME1 - fME0) * fTEdge;
fMOtherMid = 1 + (fMOther - 1) * fTOther;
if (!IsEqual(fME, fMOtherMid))
return false;
}
}
return true;
}
void CTrack::MapOriginalPoint(DISTORT* pDistort, CPoint* lpSrc, CPoint* lpDst)
{
// Compute p0 and p2 based on the X percentage
DISTORT& Distort = *pDistort;
int Numer = lpSrc->x - Distort.RectOrig.left;
int Denom = Distort.RectOrig.right - Distort.RectOrig.left;
CPoint p0, p1, p2, p3;
if (Numer == Denom /*UNITY*/)
{
p0 = Distort.p[1];
p2 = Distort.p[2];
}
else
if (!Numer)
{
p0 = Distort.p[0];
p2 = Distort.p[3];
}
else
{
double fPercentX = (double)Numer / Denom;
p0.x = Distort.p[0].x + ((Distort.p[1].x - Distort.p[0].x) * fPercentX);
p0.y = Distort.p[0].y + ((Distort.p[1].y - Distort.p[0].y) * fPercentX);
p2.x = Distort.p[2].x + ((Distort.p[3].x - Distort.p[2].x) * (-fPercentX+1.0));
p2.y = Distort.p[2].y + ((Distort.p[3].y - Distort.p[2].y) * (-fPercentX+1.0));
}
// Compute P1 and p3 based on the Y percentage
Numer = lpSrc->y - Distort.RectOrig.top;
Denom = Distort.RectOrig.bottom - Distort.RectOrig.top;
if (Numer == Denom /*UNITY*/)
{
p1 = Distort.p[2];
p3 = Distort.p[3];
}
else
if (!Numer)
{
p1 = Distort.p[1];
p3 = Distort.p[0];
}
else
{
double fPercentY = (double)Numer / Denom;
p1.x = Distort.p[1].x + ((Distort.p[2].x - Distort.p[1].x) * fPercentY);
p1.y = Distort.p[1].y + ((Distort.p[2].y - Distort.p[1].y) * fPercentY);
p3.x = Distort.p[3].x + ((Distort.p[0].x - Distort.p[3].x) * (-fPercentY+1.0));
p3.y = Distort.p[3].y + ((Distort.p[0].y - Distort.p[3].y) * (-fPercentY+1.0));
}
// Compute the points at the same x and y percentages of each of the 4 segments
// The intersection of P02 and P13 is our new point
IntersectSegments(p0, p2, p1, p3, lpDst);
}
