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#ifndef __GRIDALGORITHM_H
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#define __GRIDALGORITHM_H
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/*
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Functions:
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void for_each_voxel(Grid& g, F& f);
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void for_each_voxel(Grid& g, const Vec3i& p0, const Vec3i& p7, F& f);
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void for_each_voxel_ordered(Grid& g, const Vec3i& p0, const Vec3i& p7, F& f);
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void for_each_voxel_ordered(Grid& g, F&);
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void for_each_voxel_const(const Grid& g,
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const Vec3i& p0, const Vec3i& p7, F& f);
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void for_each_voxel_const(const Grid& g, F& f);
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void for_each_voxel_ordered_const(Grid& g,
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const Vec3i& p0, const Vec3i& p7,
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F& f);
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void for_each_voxel_ordered_const(Grid& g, F& f);
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Purpose:
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----------
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Visit all voxels (or voxels in a region og interest) in grid. A function
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is invoked on each voxel.
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The "ordered" functions traverse the grid in a systematic way: A
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slice at a time and for each slice one row at a time. The other
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functions make no guarantees about how the volume (roi) is traversed.
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Types:
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----------
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Grid - a grid type, either HGrid<T,CellT> or RGrid<T>
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F - functor type a funtion or class with the function call operator
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overloaded. The functor should look either like this
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void fun(const Vec3i&, T& x)
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or this
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void fun(const Vec3i&, const T& x)
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in the case of the const functions.
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Arguments:
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----------
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g - The voxel grid, we wish to traverse.
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p0 - (xmin, ymin, zmin) coordinates of the window we wish to
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traverse.
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p7 - (xmax, ymax, zmax) coordinates of the window we wish to
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traverse.
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f - functor.
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*/
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#include <iostream>
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#include "RGrid.h"
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#include "HGrid.h"
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namespace Geometry
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{
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template<class T, class F>
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void _for_each_voxel(T* data,
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int x_dim, int xy_dim,
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const CGLA::Vec3i& p0,
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const CGLA::Vec3i& p7,
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F& functor,
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const CGLA::Vec3i& offset = CGLA::Vec3i(0))
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{
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const int Amin = p0[2]*xy_dim;
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const int Amax = p7[2]*xy_dim;
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int Bmin = Amin +p0[1]*x_dim;
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int Bmax = Amin +p7[1]*x_dim;
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CGLA::Vec3i p0o = p0+offset;
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CGLA::Vec3i p(p0o);
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for(int A=Amin; A<Amax; A+=xy_dim, ++p[2])
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{
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p[1] = p0o[1];
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for(int B = Bmin; B<Bmax; B+=x_dim, ++p[1])
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{
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p[0] = p0o[0];
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int Cmin = B+p0[0];
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int Cmax = B+p7[0];
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for(int C=Cmin; C<Cmax; ++C, ++p[0])
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functor(p, data[C]);
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}
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Bmin += xy_dim;
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Bmax += xy_dim;
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}
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}
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template<class T, class F>
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void _for_each_voxel(T* data,
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const CGLA::Vec3i& dims,
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F& functor,
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const CGLA::Vec3i& offset = CGLA::Vec3i(0))
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{
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int l=0;
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CGLA::Vec3i p(offset);
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CGLA::Vec3i p7(offset);
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p7 += dims;
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for(; p[2]<p7[2]; ++p[2])
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for(p[1]=offset[1]; p[1]<p7[1]; ++p[1])
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for(p[0]=offset[0]; p[0]<p7[0]; ++p[0])
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functor(p, data[l++]);
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}
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/** Loop over all voxels in a sub-region (slice) of an
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RGrid and invoke a functor on each voxel.
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The grid is the first argument, the slice is
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specified by the two subsequent args, and the functor
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is the last argument. */
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template<class T, class F>
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void for_each_voxel(RGrid<T>& grid,
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const CGLA::Vec3i& p0,
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const CGLA::Vec3i& p7,
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F& functor)
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{
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_for_each_voxel(grid.get(), grid.get_x_dim(), grid.get_xy_dim(),
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CGLA::v_max(p0, CGLA::Vec3i(0)),
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CGLA::v_min(p7, grid.get_dims()),
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functor);
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}
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/** Loop over all voxels in an entire RGrid.
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Grid is the first argument, and a functor is
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the second. For each voxel, an operation
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specified by the functor is performed. */
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template<class T, class F>
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void for_each_voxel(RGrid<T>& grid, F& functor)
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{
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_for_each_voxel(grid.get(), grid.get_dims(), functor);
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}
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/** For each voxel (ordered). The idea of ordered traversal is
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that we traverse the volume in a systematic fashion as opposed
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to traversing simply according to the memory layout of the volume
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data structure. This is important e.g. if we want to save the
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volume in raw format.
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For an RGrid, there is no difference though.
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*/
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template<class T, class F>
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void for_each_voxel_ordered(RGrid<T>& grid,
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const CGLA::Vec3i& p0,
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const CGLA::Vec3i& p7,
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F& functor)
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{
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_for_each_voxel(grid.get(), grid.get_x_dim(), grid.get_xy_dim(),
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CGLA::v_max(p0, CGLA::Vec3i(0)),
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CGLA::v_min(p7, grid.get_dims()),
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functor);
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}
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template<class T, class F>
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void for_each_voxel_ordered(RGrid<T>& grid, F& functor)
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{
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_for_each_voxel(grid.get(), grid.get_dims(), functor);
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}
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template<class T, class CellT, class F>
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void for_each_cell(HGrid<T,CellT>& grid,
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const CGLA::Vec3i& p0,
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const CGLA::Vec3i& p7,
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F& functor)
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{
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CGLA::Vec3i p0t = p0/grid.get_bottom_dim();
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CGLA::Vec3i p7t = CGLA::v_min(p7/grid.get_bottom_dim()+
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CGLA::Vec3i(1),
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grid.get_top_dims());
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for(CGLA::Vec3i pt(p0t); pt[2]<p7t[2]; ++pt[2])
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for(pt[1]=p0t[1]; pt[1]<p7t[1]; ++pt[1])
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for(pt[0]=p0t[0]; pt[0]<p7t[0]; ++pt[0])
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functor(pt*CellT::get_dim(), grid.get_cell(pt));
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}
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template<class T, class CellT, class F>
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void for_each_cell(HGrid<T,CellT>& grid,
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F& functor)
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{
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CGLA::Vec3i p0t;
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CGLA::Vec3i p7t = grid.get_dims();
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const int inc = CellT::get_dim();
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int l=0;
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for(CGLA::Vec3i pt(p0t); pt[2]<p7t[2]; pt[2]+=inc)
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for(pt[1]=p0t[1]; pt[1]<p7t[1]; pt[1]+=inc)
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for(pt[0]=p0t[0]; pt[0]<p7t[0]; pt[0]+=inc)
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functor(pt, grid.get_cell(l++));
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}
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template<class CellT, class F>
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class _HGridCellFunctor
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{
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const CGLA::Vec3i p0;
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const CGLA::Vec3i p7;
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F& functor;
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public:
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_HGridCellFunctor(const CGLA::Vec3i _p0,
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const CGLA::Vec3i _p7,
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F& _functor): p0(_p0), p7(_p7), functor(_functor) {}
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void operator()(const CGLA::Vec3i& offset,
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CellT& cell)
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{
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CGLA::Vec3i p0c = CGLA::v_max(p0-offset, CGLA::Vec3i(0));
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CGLA::Vec3i p7c = CGLA::v_min(p7-offset, CGLA::Vec3i(CellT::get_dim()));
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if(cell.is_coalesced())
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cell.split();
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_for_each_voxel(cell.get(),
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CellT::get_dim(),
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CGLA::sqr(CellT::get_dim()),
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p0c, p7c, functor, offset);
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}
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};
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template<class T, class CellT, class F>
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void for_each_voxel(HGrid<T,CellT>& grid,
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const CGLA::Vec3i& _p0,
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const CGLA::Vec3i& _p7,
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F& functor)
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{
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CGLA::Vec3i p0 = CGLA::v_max(_p0, CGLA::Vec3i(0));
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CGLA::Vec3i p7 = CGLA::v_min(_p7, grid.get_dims());
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_HGridCellFunctor<CellT,F> cell_functor(p0, p7, functor);
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for_each_cell(grid, p0, p7, cell_functor);
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}
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template<class T, class CellT, class F>
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void for_each_voxel(HGrid<T,CellT>& grid, F& functor)
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{
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_HGridCellFunctor<CellT,F> cell_functor(CGLA::Vec3i(0),
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grid.get_dims(), functor);
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for_each_cell(grid, cell_functor);
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}
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template<class T, class CellT, class F>
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void for_each_voxel_ordered(HGrid<T,CellT>& grid,
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const CGLA::Vec3i& _p0,
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const CGLA::Vec3i& _p7,
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F& functor)
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{
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CGLA::Vec3i p0 = CGLA::v_max(_p0, CGLA::Vec3i(0));
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CGLA::Vec3i p7 = CGLA::v_min(_p7, grid.get_dims());
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for(int k=p0[2];k<p7[2];++k)
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for(int j=p0[1];j<p7[1];++j)
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for(int i=p0[0];i<p7[0];++i)
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{
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CGLA::Vec3i p(i,j,k);
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float val = grid[p];
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float nval = val;
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functor(p, nval);
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if(nval != val)
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grid.store(p, nval);
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}
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}
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template<class T, class CellT, class F>
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void for_each_voxel_ordered(HGrid<T,CellT>& grid, F& functor)
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{
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for_each_voxel_ordered(grid, CGLA::Vec3i(0), grid.get_dims(), functor);
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}
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template<typename T>
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class _AssignFun
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{
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T val;
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public:
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_AssignFun(const T& _val): val(_val) {}
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void operator()(const CGLA::Vec3i& pi, T& vox_val)
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{
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vox_val = val;
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}
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};
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template<class G>
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void clear_region(G& grid, const typename G::DataType& value)
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{
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_AssignFun<typename G::DataType> afun(value);
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for_each_voxel(grid, afun);
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}
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template<class G>
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void clear_region(G& grid,
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const CGLA::Vec3i& p0,
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const CGLA::Vec3i& p7,
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const typename G::DataType& value)
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{
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_AssignFun<typename G::DataType>afun(value) ;
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for_each_voxel(grid, p0, p7, afun);
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}
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//----------------------------------------------------------------------
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// const versions.
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/** Loop over all voxels in a sub-region (slice) of an
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RGrid and invoke a functor on each voxel.
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The grid is the first argument, the slice is
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specified by the two subsequent args, and the functor
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is the last argument. */
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template<class T, class F>
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void for_each_voxel_const(const RGrid<T>& grid,
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const CGLA::Vec3i& p0,
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const CGLA::Vec3i& p7,
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F& functor)
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{
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_for_each_voxel(grid.get(), grid.get_x_dim(), grid.get_xy_dim(),
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CGLA::v_max(p0, CGLA::Vec3i(0)),
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CGLA::v_min(p7, grid.get_dims()),
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functor);
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}
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/** Loop over all voxels in an entire RGrid.
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Grid is the first argument, and a functor is
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the second. For each voxel, an operation
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specified by the functor is performed. */
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template<class T, class F>
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void for_each_voxel_const(const RGrid<T>& grid, F& functor)
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{
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_for_each_voxel(grid.get(), grid.get_dims(), functor);
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}
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/** For each voxel (ordered). The idea of ordered traversal is
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that we traverse the volume in a systematic fashion as opposed
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336 |
to traversing simply according to the memory layout of the volume
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337 |
data structure. This is important e.g. if we want to save the
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338 |
volume in raw format.
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339 |
For an RGrid, there is no difference though.
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340 |
*/
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341 |
template<class T, class F>
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void for_each_voxel_ordered_const(const RGrid<T>& grid,
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const CGLA::Vec3i& p0,
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344 |
const CGLA::Vec3i& p7,
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F& functor)
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{
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347 |
_for_each_voxel(grid.get(), grid.get_x_dim(), grid.get_xy_dim(),
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CGLA::v_max(p0, CGLA::Vec3i(0)),
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349 |
CGLA::v_min(p7, grid.get_dims()),
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350 |
functor);
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351 |
}
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352 |
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353 |
template<class T, class F>
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void for_each_voxel_ordered_const(const RGrid<T>& grid, F& functor)
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{
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_for_each_voxel(grid.get(), grid.get_dims(), functor);
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357 |
}
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358 |
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359 |
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360 |
template<class T, class CellT, class F>
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361 |
void for_each_cell_const(const HGrid<T,CellT>& grid,
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362 |
const CGLA::Vec3i& p0,
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363 |
const CGLA::Vec3i& p7,
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364 |
F& functor)
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365 |
{
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366 |
CGLA::Vec3i p0t = p0/grid.get_bottom_dim();
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367 |
CGLA::Vec3i p7t = CGLA::v_min(p7/grid.get_bottom_dim()+
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368 |
CGLA::Vec3i(1),
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369 |
grid.get_top_dims());
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370 |
for(CGLA::Vec3i pt(p0t); pt[2]<p7t[2]; ++pt[2])
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371 |
for(pt[1]=p0t[1]; pt[1]<p7t[1]; ++pt[1])
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372 |
for(pt[0]=p0t[0]; pt[0]<p7t[0]; ++pt[0])
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373 |
functor(pt*CellT::get_dim(), grid.get_cell(pt));
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374 |
}
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375 |
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376 |
template<class T, class CellT, class F>
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377 |
void for_each_cell_const(const HGrid<T,CellT>& grid,
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|
378 |
F& functor)
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|
379 |
{
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|
380 |
CGLA::Vec3i p0t;
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|
381 |
CGLA::Vec3i p7t = grid.get_dims();
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|
382 |
const int inc = CellT::get_dim();
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|
383 |
int l=0;
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|
384 |
for(CGLA::Vec3i pt(p0t); pt[2]<p7t[2]; pt[2]+=inc)
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|
385 |
for(pt[1]=p0t[1]; pt[1]<p7t[1]; pt[1]+=inc)
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|
386 |
for(pt[0]=p0t[0]; pt[0]<p7t[0]; pt[0]+=inc)
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|
387 |
functor(pt, grid.get_cell(l++));
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|
388 |
}
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|
389 |
|
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|
390 |
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|
391 |
template<class CellT, class F>
|
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|
392 |
class _HGridCellFunctorConst
|
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|
393 |
{
|
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|
394 |
const CGLA::Vec3i p0;
|
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|
395 |
const CGLA::Vec3i p7;
|
|
|
396 |
F& functor;
|
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|
397 |
|
|
|
398 |
public:
|
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|
399 |
_HGridCellFunctorConst(const CGLA::Vec3i _p0,
|
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|
400 |
const CGLA::Vec3i _p7,
|
|
|
401 |
F& _functor): p0(_p0), p7(_p7), functor(_functor) {}
|
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|
402 |
|
|
|
403 |
void operator()(const CGLA::Vec3i& offset,
|
|
|
404 |
const CellT& cell)
|
|
|
405 |
{
|
|
|
406 |
CGLA::Vec3i p0c = CGLA::v_max(p0-offset, CGLA::Vec3i(0));
|
|
|
407 |
CGLA::Vec3i p7c = CGLA::v_min(p7-offset, CGLA::Vec3i(CellT::get_dim()));
|
|
|
408 |
|
|
|
409 |
if(cell.is_coalesced())
|
|
|
410 |
{
|
|
|
411 |
typename CellT::DataType val = *cell.get();
|
|
|
412 |
for(CGLA::Vec3i p(p0c); p[2]<p7c[2]; ++p[2])
|
|
|
413 |
for(p[1]=p0c[1]; p[1]<p7c[1]; ++p[1])
|
|
|
414 |
for(p[0]=p0c[0]; p[0]<p7c[0]; ++p[0])
|
|
|
415 |
functor(p+offset, val);
|
|
|
416 |
}
|
|
|
417 |
_for_each_voxel(cell.get(),
|
|
|
418 |
CellT::get_dim(),
|
|
|
419 |
CGLA::sqr(CellT::get_dim()),
|
|
|
420 |
p0c, p7c, functor, offset);
|
|
|
421 |
}
|
|
|
422 |
};
|
|
|
423 |
|
|
|
424 |
|
|
|
425 |
template<class T, class CellT, class F>
|
|
|
426 |
void for_each_voxel_const(const HGrid<T,CellT>& grid,
|
|
|
427 |
const CGLA::Vec3i& _p0,
|
|
|
428 |
const CGLA::Vec3i& _p7,
|
|
|
429 |
F& functor)
|
|
|
430 |
{
|
|
|
431 |
CGLA::Vec3i p0 = CGLA::v_max(_p0, CGLA::Vec3i(0));
|
|
|
432 |
CGLA::Vec3i p7 = CGLA::v_min(_p7, grid.get_dims());
|
|
|
433 |
_HGridCellFunctorConst<CellT,F> cell_functor(p0, p7, functor);
|
|
|
434 |
for_each_cell_const(grid, p0, p7, cell_functor);
|
|
|
435 |
}
|
|
|
436 |
|
|
|
437 |
template<class T, class CellT, class F>
|
|
|
438 |
void for_each_voxel_const(const HGrid<T,CellT>& grid, F& functor)
|
|
|
439 |
{
|
|
|
440 |
_HGridCellFunctorConst<CellT,F> cell_functor(CGLA::Vec3i(0),
|
|
|
441 |
grid.get_dims(), functor);
|
|
|
442 |
for_each_cell_const(grid, cell_functor);
|
|
|
443 |
}
|
|
|
444 |
|
|
|
445 |
template<class T, class CellT, class F>
|
|
|
446 |
void for_each_voxel_ordered_const(const HGrid<T,CellT>& grid,
|
|
|
447 |
const CGLA::Vec3i& _p0,
|
|
|
448 |
const CGLA::Vec3i& _p7,
|
|
|
449 |
F& functor)
|
|
|
450 |
{
|
|
|
451 |
CGLA::Vec3i p0 = CGLA::v_max(_p0, CGLA::Vec3i(0));
|
|
|
452 |
CGLA::Vec3i p7 = CGLA::v_min(_p7, grid.get_dims());
|
|
|
453 |
for(int k=p0[2];k<p7[2];++k)
|
|
|
454 |
for(int j=p0[1];j<p7[1];++j)
|
|
|
455 |
for(int i=p0[0];i<p7[0];++i)
|
|
|
456 |
{
|
|
|
457 |
CGLA::Vec3i p(i,j,k);
|
|
|
458 |
functor(p, grid[p]);
|
|
|
459 |
}
|
|
|
460 |
}
|
|
|
461 |
|
|
|
462 |
template<class T, class CellT, class F>
|
|
|
463 |
void for_each_voxel_ordered_const(const HGrid<T,CellT>& grid, F& functor)
|
|
|
464 |
{
|
|
|
465 |
for_each_voxel_ordered_const(grid,
|
|
|
466 |
CGLA::Vec3i(0),
|
|
|
467 |
grid.get_dims(),
|
|
|
468 |
functor);
|
|
|
469 |
}
|
|
|
470 |
|
|
|
471 |
|
|
|
472 |
}
|
|
|
473 |
|
|
|
474 |
#endif
|