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SHAPE_POLY_SET: split polygons into rectangular cell grids to obtain more regular triangulations

This commit is contained in:
Tomasz Wlostowski 2020-09-05 01:09:34 +02:00
parent a31c9ae7af
commit aee06e46b0
1 changed files with 69 additions and 4 deletions
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73
libs/kimath/src/geometry/shape_poly_set.cpp
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@ -1900,6 +1900,72 @@ bool SHAPE_POLY_SET::IsTriangulationUpToDate() const
}
static void partitionPolyIntoRegularCellGrid(
const SHAPE_POLY_SET& aPoly, int aCells, SHAPE_POLY_SET& aOut )
{
BOX2I bb = aPoly.BBox();
double w = bb.GetWidth();
double h = bb.GetHeight();
if( w == 0.0 || h == 0.0 )
return;
int n_cells_x, n_cells_y;
if( w > h )
{
n_cells_x = aCells;
n_cells_y = (int) floor( h / w * (double) aCells ) + 1;
}
else
{
n_cells_x = (int) floor( w / h * (double) aCells ) + 1;
n_cells_y = aCells;
}
SHAPE_POLY_SET ps1( aPoly ), ps2( aPoly ), maskSetOdd, maskSetEven;
for( int yy = 0; yy < n_cells_y; yy++ )
for( int xx = 0; xx < n_cells_x; xx++ )
{
VECTOR2I p;
p.x = bb.GetX() + w * xx / n_cells_x;
p.y = bb.GetY() + h * yy / n_cells_y;
VECTOR2I p2;
p2.x = bb.GetX() + w * ( xx + 1 ) / n_cells_x;
p2.y = bb.GetY() + h * ( yy + 1 ) / n_cells_y;
SHAPE_LINE_CHAIN mask;
mask.Append( VECTOR2I( p.x, p.y ) );
mask.Append( VECTOR2I( p2.x, p.y ) );
mask.Append( VECTOR2I( p2.x, p2.y ) );
mask.Append( VECTOR2I( p.x, p2.y ) );
mask.SetClosed( true );
if( ( xx ^ yy ) & 1 )
maskSetOdd.AddOutline( mask );
else
maskSetEven.AddOutline( mask );
}
ps1.BooleanIntersection( maskSetOdd, SHAPE_POLY_SET::PM_FAST );
ps2.BooleanIntersection( maskSetEven, SHAPE_POLY_SET::PM_FAST );
ps1.Fracture( SHAPE_POLY_SET::PM_FAST );
ps2.Fracture( SHAPE_POLY_SET::PM_FAST );
aOut = ps1;
for( int i = 0; i < ps2.OutlineCount(); i++ )
{
aOut.AddOutline( ps2.COutline( i ) );
}
}
void SHAPE_POLY_SET::CacheTriangulation()
{
bool recalculate = !m_hash.IsValid();
@ -1922,10 +1988,9 @@ void SHAPE_POLY_SET::CacheTriangulation()
if( !recalculate )
return;
SHAPE_POLY_SET tmpSet = *this;
if( tmpSet.HasHoles() )
tmpSet.Fracture( PM_FAST );
SHAPE_POLY_SET tmpSet;
partitionPolyIntoRegularCellGrid( *this, 20, tmpSet );
m_triangulatedPolys.clear();
m_triangulationValid = true;