double vtIcoGlobe::AddSurfaceLineToMesh(vtGeomFactory *pMF, const DLine2 &line)
{
DPoint2 g1, g2;
DPoint3 p1, p2;
double scale = 1.0002;
int length = 0;
DMatrix3 rot3;
pMF->PrimStart();
int i, j, size = line.GetSize();
for (i = 0; i < size-1; i++)
{
g1 = line.GetAt(i);
g2 = line.GetAt(i+1);
// for each pair of points, determine how many more points are needed
// for a smooth arc
geo_to_xyz(1.0, g1, p1);
geo_to_xyz(1.0, g2, p2);
double angle = acos(p1.Dot(p2));
int segments = (int) (angle * 2000);
if (segments < 1)
segments = 1;
if (segments > 1)
{
// calculate the axis of rotation
DPoint3 cross = p1.Cross(p2);
cross.Normalize();
rot3.AxisAngle(cross, angle / segments);
}
// curved arc on great-circle path
for (j = 0; j < segments; j++)
{
FPoint3 fp = p1 * 1.0002;
pMF->AddVertex(fp);
length++;
if (j < segments-1)
{
rot3.Transform(p1, p2);
p1 = p2;
}
}
}
// last vertex
if (size > 1)
{
g2 = line.GetAt(size-1);
geo_to_xyz(1.0, g2, p2);
pMF->AddVertex(p2 * scale);
length++;
}
pMF->PrimEnd();
return 0.0;
}
void vtStructureArray::Offset(const DPoint2 &delta)
{
uint npoints = GetSize();
if (!npoints)
return;
uint i, j;
DPoint2 temp;
for (i = 0; i < npoints; i++)
{
vtStructure *str = GetAt(i);
vtBuilding *bld = str->GetBuilding();
if (bld)
bld->Offset(delta);
vtFence *fen = str->GetFence();
if (fen)
{
DLine2 line = fen->GetFencePoints();
for (j = 0; j < line.GetSize(); j++)
line.GetAt(j) += delta;
}
vtStructInstance *inst = str->GetInstance();
if (inst)
inst->Offset(delta);
}
}
void vtLevel::SetFootprint(const DLine2 &dl)
{
// Safety check: Make sure there is at least an outer polygon
if (m_Foot.size() == 0)
m_Foot.resize(1);
int prev = m_Foot[0].GetSize();
m_Foot[0] = dl;
int curr = dl.GetSize();
if (curr != prev)
RebuildEdges(curr);
}
bool PolyChecker::IsSimplePolygon(const DLine2 &vertices)
{
int iSize = vertices.GetSize();
int i,j;
for (i = 0; i < iSize - 2; i++)
for (j = i + 2; j < (i == 0 ? iSize - 1 : iSize); j++)
if (Intersect(vertices[i], vertices[(i + 1) % iSize],
vertices[j], vertices[(j+ 1) % iSize]))
return false;
return true;
}
bool PolyChecker::IsClockwisePolygon(const DLine2 &vertices)
{
DPoint2 p1, p2;
int iSize = vertices.GetSize();
// Cannot remember if this works for all Jordan
double Area = 0;
for (int i = 0; i < iSize; i++)
{
p1 = vertices[i];
p2 = vertices[(i+1)%iSize];
Area += (p2.x - p1.x) * (p2.y + p1.y);
}
if (Area > 0)
return true;
else
return false;
}
/**
* Create a set of points on the heightfield for a 2D polyline by draping the point onto
* the surface.
*
* \param line The 2D line to drape, in Earth coordinates.
* \param fSpacing The approximate spacing of the surface tessellation, used to
* decide how finely to tessellate the line.
* \param fOffset An offset to elevate each point in the resulting geometry,
* useful for keeping it visibly above the ground.
* \param bInterp True to interpolate between the vertices of the input
* line. This is generally desirable when the ground is much more finely
* spaced than the input line.
* \param bCurve True to interpret the vertices of the input line as
* control points of a curve. The created geometry will consist of
* a draped line which passes through the control points.
* \param bTrue True to use the true elevation of the terrain, ignoring
* whatever scale factor is being used to exaggerate elevation for
* display.
* \param output Received the points.
* \return The approximate length of the resulting 3D polyline.
*/
float vtHeightField3d::LineOnSurface(const DLine2 &line, float fSpacing, float fOffset,
bool bInterp, bool bCurve, bool bTrue, FLine3 &output)
{
uint i, j;
FPoint3 v1, v2, v;
float fTotalLength = 0.0f;
int iVerts = 0;
uint points = line.GetSize();
if (bCurve)
{
DPoint2 p2, last(1E9,1E9);
DPoint3 p3;
int spline_points = 0;
CubicSpline spline;
for (i = 0; i < points; i++)
{
p2 = line[i];
if (i > 1 && p2 == last)
continue;
p3.Set(p2.x, p2.y, 0);
spline.AddPoint(p3);
spline_points++;
last = p2;
}
spline.Generate();
// Estimate how many steps to subdivide this line into
const double dLinearLength = line.Length();
float fLinearLength, dummy;
m_LocalCS.VectorEarthToLocal(DPoint2(dLinearLength, 0.0), fLinearLength, dummy);
double full = (double) (spline_points-1);
int iSteps = (uint) (fLinearLength / fSpacing);
if (iSteps < 3)
iSteps = 3;
double dStep = full / iSteps;
FPoint3 last_v;
for (double f = 0; f <= full; f += dStep)
{
spline.Interpolate(f, &p3);
m_LocalCS.EarthToLocal(p3.x, p3.y, v.x, v.z);
FindAltitudeAtPoint(v, v.y, bTrue);
v.y += fOffset;
output.Append(v);
iVerts++;
// keep a running total of approximate ground length
if (f > 0)
fTotalLength += (v - last_v).Length();
last_v = v;
}
}
else
{
// not curved: straight line in earth coordinates
FPoint3 last_v;
for (i = 0; i < points; i++)
{
if (bInterp)
{
v1 = v2;
m_LocalCS.EarthToLocal(line[i].x, line[i].y, v2.x, v2.z);
if (i == 0)
continue;
// estimate how many steps to subdivide this segment into
FPoint3 diff = v2 - v1;
float fLen = diff.Length();
uint iSteps = (uint) (fLen / fSpacing);
if (iSteps < 1) iSteps = 1;
for (j = (i == 1 ? 0:1); j <= iSteps; j++)
{
// simple linear interpolation of the ground coordinate
v.Set(v1.x + diff.x / iSteps * j, 0.0f, v1.z + diff.z / iSteps * j);
FindAltitudeAtPoint(v, v.y, bTrue);
v.y += fOffset;
output.Append(v);
iVerts++;
// keep a running total of approximate ground length
if (j > 0)
fTotalLength += (v - last_v).Length();
last_v = v;
}
}
else
{
m_LocalCS.EarthToLocal(line[i], v.x, v.z);
FindAltitudeAtPoint(v, v.y, bTrue);
v.y += fOffset;
output.Append(v);
}
}
}
return fTotalLength;
}
void vtVegLayer::AddElementsFromLULC(vtLULCFile *pLULC)
{
LULCSection *section;
LULCPoly *poly;
SetVegType(VLT_Density);
//set projections
vtProjection proj_new;
proj_new.SetProjectionSimple(0, -1, EPSG_DATUM_WGS84);
SetProjection(proj_new);
// figure out the number of polygons in file
uint size = 0;
for (uint sec = 0; sec < pLULC->NumSections(); sec++)
{
section = pLULC->GetSection(sec);
size = size + section->m_iNumPolys;
}
// Create density field
m_field_density = m_pSet->AddField("Density", FT_Float);
m_pSet->SetNumEntities(size);
// get each poly from LULC file
uint i, s, p, count = 0;
float density=0;
for (s = 0; s < pLULC->NumSections(); s++)
{
section = pLULC->GetSection(s);
for (p = 0; p < section->m_iNumPolys; p++)
{
poly = section->m_pPoly + p;
bool wild = false;
switch (poly->Attribute)
{
case 42: // forest
wild = true;
density = 1.0f;
break;
case 32:
case 33:
wild = true;
density = 0.5;
break;
case 22: // orchards
wild = false;
// no crops for now
break;
default:
density = 0.0f;
break;
}
DLine2 dline;
dline.SetSize(poly->m_iCoords);
// get Coords of LULCpoly and store as latlon, then save in VPoly
for (i = 0; i < dline.GetSize(); i++)
dline.SetAt(i, poly->m_p[i]);
DPolygon2 dpoly;
dpoly.push_back(dline);
GetPS()->SetPolygon(count, dpoly);
m_pSet->SetValue(count, m_field_density, density);
count++;
}
}
}
