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osgEarth 2.1.1
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osgEarth 2.1.1
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Inheritance diagram for osgEarth::Symbology::Ring: Collaboration diagram for osgEarth::Symbology::Ring:Public Types | |
| enum | Orientation { ORIENTATION_CCW, ORIENTATION_CW, ORIENTATION_DEGENERATE } |
Public Member Functions | |
| Ring (int capacity=0) | |
| Ring (const Ring &ring) | |
| Ring (const Vec3dVector *toCopy) | |
| virtual Geometry * | cloneAs (const Geometry::Type &newType) const |
| Orientation | getOrientation () const |
| virtual bool | contains2D (double x, double y) const |
| virtual double | getSignedArea2D () const |
| virtual void | open () |
| void | rewind (Orientation ori) |
| virtual Type | getType () const |
| virtual bool | isValid () const |
A Ring is a closed region. It is open (the first and last points are not the same). It has an orientation, i.e. it is either wound clockwise or counter-clockwise.
| osgEarth::Symbology::Ring::Ring | ( | int | capacity = 0 | ) | [inline] |
| Ring::Ring | ( | const Ring & | ring | ) |
Definition at line 405 of file Geometry.cpp.
: Geometry( rhs ) { //nop }
| Ring::Ring | ( | const Vec3dVector * | toCopy | ) |
| Geometry * Ring::cloneAs | ( | const Geometry::Type & | newType | ) | const [virtual] |
Converts this geometry to another type. This function will return "this" if the type is the same, and will return NULL if the conversion is impossible.
Reimplemented from osgEarth::Symbology::Geometry.
Definition at line 418 of file Geometry.cpp.
{
if ( newType == TYPE_LINESTRING )
{
LineString* line = new LineString( &this->asVector() );
if ( line->size() > 1 && line->front() != line->back() )
line->push_back( front() );
return line;
}
else return Geometry::cloneAs( newType );
}
Here is the call graph for this function:| bool Ring::contains2D | ( | double | x, |
| double | y | ||
| ) | const [virtual] |
Reimplemented in osgEarth::Symbology::Polygon.
Definition at line 517 of file Geometry.cpp.
{
bool result = false;
const Ring& poly = *this;
for( unsigned i=0, j=size()-1; i<size(); j = i++ )
{
if ((((poly[i].y() <= y) && (y < poly[j].y())) ||
((poly[j].y() <= y) && (y < poly[i].y()))) &&
(x < (poly[j].x()-poly[i].x()) * (y-poly[i].y())/(poly[j].y()-poly[i].y())+poly[i].x()))
{
result = !result;
}
}
return result;
}
Here is the call graph for this function: Here is the caller graph for this function:| Ring::Orientation Ring::getOrientation | ( | ) | const |
Definition at line 431 of file Geometry.cpp.
{
// adjust for a non-open ring:
int n = size();
while( n > 0 && front() == back() )
n--;
if ( n < 3 )
return Ring::ORIENTATION_DEGENERATE;
// copy the open vec:
std::vector<osg::Vec3d> v;
v.reserve( n );
std::copy( begin(), begin()+n, std::back_inserter(v) );
int rmin = 0;
double xmin = v[0].x();
double ymin = v[0].y();
v[0].z() = 0;
for( int i=1; i<n; ++i ) {
double x = v[i].x();
double y = v[i].y();
v[i].z() = 0;
if ( y > ymin )
continue;
if ( y == ymin ) {
if (x < xmin )
continue;
}
rmin = i;
xmin = x;
ymin = y;
}
int rmin_less_1 = rmin-1 >= 0 ? rmin-1 : n-1;
int rmin_plus_1 = rmin+1 < n ? rmin+1 : 0;
osg::Vec3 in = v[rmin] - v[rmin_less_1]; in.normalize();
osg::Vec3 out = v[rmin_plus_1] - v[rmin]; out.normalize();
osg::Vec3 cross = in ^ out;
return
cross.z() < 0.0 ? Ring::ORIENTATION_CW :
cross.z() > 0.0 ? Ring::ORIENTATION_CCW :
Ring::ORIENTATION_DEGENERATE;
}
Here is the call graph for this function: Here is the caller graph for this function:| double Ring::getSignedArea2D | ( | ) | const [virtual] |
Definition at line 488 of file Geometry.cpp.
{
const_cast<Ring*>(this)->open();
double sum = 0.0;
for( unsigned i=0; i<size(); ++i )
{
const osg::Vec3d& p0 = (*this)[0];
const osg::Vec3d& p1 = i+1 < size() ? (*this)[i+1] : (*this)[0];
sum += p0.x()*p1.y() - p1.x()*p0.y();
}
return .5*sum;
}
Here is the call graph for this function:| virtual Type osgEarth::Symbology::Ring::getType | ( | ) | const [inline, virtual] |
Implements osgEarth::Symbology::Geometry.
Reimplemented in osgEarth::Symbology::Polygon.
Definition at line 251 of file Geometry.
{ return Geometry::TYPE_RING; }
| virtual bool osgEarth::Symbology::Ring::isValid | ( | ) | const [inline, virtual] |
Reimplemented from osgEarth::Symbology::Geometry.
Definition at line 252 of file Geometry.
{ return size() >= 3; }
| void Ring::open | ( | ) | [virtual] |
Reimplemented in osgEarth::Symbology::Polygon.
Definition at line 480 of file Geometry.cpp.
Here is the call graph for this function: Here is the caller graph for this function:| void Ring::rewind | ( | Orientation | ori | ) |
Definition at line 505 of file Geometry.cpp.
{
open();
Orientation current = getOrientation();
if ( current != orientation && current != ORIENTATION_DEGENERATE && orientation != ORIENTATION_DEGENERATE )
{
std::reverse( begin(), end() );
}
}
Here is the call graph for this function: Here is the caller graph for this function:
1.7.3
