307 lines
10 KiB
C++
307 lines
10 KiB
C++
#ifndef slic3r_EdgeGrid_hpp_
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#define slic3r_EdgeGrid_hpp_
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#include <stdint.h>
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#include <math.h>
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#include "Point.hpp"
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#include "BoundingBox.hpp"
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#include "ExPolygon.hpp"
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#include "ExPolygonCollection.hpp"
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namespace Slic3r {
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namespace EdgeGrid {
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class Grid
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{
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public:
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Grid();
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~Grid();
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void set_bbox(const BoundingBox &bbox) { m_bbox = bbox; }
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void create(const Polygons &polygons, coord_t resolution);
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void create(const std::vector<Points> &polygons, coord_t resolution);
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void create(const ExPolygon &expoly, coord_t resolution);
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void create(const ExPolygons &expolygons, coord_t resolution);
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void create(const ExPolygonCollection &expolygons, coord_t resolution);
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const std::vector<const Slic3r::Points*>& contours() const { return m_contours; }
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#if 0
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// Test, whether the edges inside the grid intersect with the polygons provided.
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bool intersect(const MultiPoint &polyline, bool closed);
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bool intersect(const Polygon &polygon) { return intersect(static_cast<const MultiPoint&>(polygon), true); }
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bool intersect(const Polygons &polygons) { for (size_t i = 0; i < polygons.size(); ++ i) if (intersect(polygons[i])) return true; return false; }
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bool intersect(const ExPolygon &expoly) { if (intersect(expoly.contour)) return true; for (size_t i = 0; i < expoly.holes.size(); ++ i) if (intersect(expoly.holes[i])) return true; return false; }
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bool intersect(const ExPolygons &expolygons) { for (size_t i = 0; i < expolygons.size(); ++ i) if (intersect(expolygons[i])) return true; return false; }
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bool intersect(const ExPolygonCollection &expolygons) { return intersect(expolygons.expolygons); }
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// Test, whether a point is inside a contour.
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bool inside(const Point &pt);
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#endif
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// Fill in a rough m_signed_distance_field from the edge grid.
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// The rough SDF is used by signed_distance() for distances outside of the search_radius.
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void calculate_sdf();
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// Return an estimate of the signed distance based on m_signed_distance_field grid.
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float signed_distance_bilinear(const Point &pt) const;
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// Calculate a signed distance to the contours in search_radius from the point.
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struct ClosestPointResult {
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size_t contour_idx = size_t(-1);
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size_t start_point_idx = size_t(-1);
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// Signed distance to the closest point.
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double distance = std::numeric_limits<double>::max();
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// Parameter of the closest point on edge starting with start_point_idx <0, 1)
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double t = 0.;
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bool valid() const { return contour_idx != size_t(-1); }
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};
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ClosestPointResult closest_point(const Point &pt, coord_t search_radius) const;
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bool signed_distance_edges(const Point &pt, coord_t search_radius, coordf_t &result_min_dist, bool *pon_segment = nullptr) const;
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// Calculate a signed distance to the contours in search_radius from the point. If no edge is found in search_radius,
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// return an interpolated value from m_signed_distance_field, if it exists.
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bool signed_distance(const Point &pt, coord_t search_radius, coordf_t &result_min_dist) const;
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const BoundingBox& bbox() const { return m_bbox; }
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const coord_t resolution() const { return m_resolution; }
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const size_t rows() const { return m_rows; }
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const size_t cols() const { return m_cols; }
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// For supports: Contours enclosing the rasterized edges.
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Polygons contours_simplified(coord_t offset, bool fill_holes) const;
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typedef std::pair<const Slic3r::Points*, size_t> ContourPoint;
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typedef std::pair<const Slic3r::Points*, size_t> ContourEdge;
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std::vector<std::pair<ContourEdge, ContourEdge>> intersecting_edges() const;
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bool has_intersecting_edges() const;
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template<typename VISITOR> void visit_cells_intersecting_line(Slic3r::Point p1, Slic3r::Point p2, VISITOR &visitor) const
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{
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// End points of the line segment.
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p1(0) -= m_bbox.min(0);
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p1(1) -= m_bbox.min(1);
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p2(0) -= m_bbox.min(0);
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p2(1) -= m_bbox.min(1);
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// Get the cells of the end points.
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coord_t ix = p1(0) / m_resolution;
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coord_t iy = p1(1) / m_resolution;
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coord_t ixb = p2(0) / m_resolution;
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coord_t iyb = p2(1) / m_resolution;
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assert(ix >= 0 && size_t(ix) < m_cols);
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assert(iy >= 0 && size_t(iy) < m_rows);
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assert(ixb >= 0 && size_t(ixb) < m_cols);
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assert(iyb >= 0 && size_t(iyb) < m_rows);
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// Account for the end points.
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if (! visitor(iy, ix) || (ix == ixb && iy == iyb))
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// Both ends fall into the same cell.
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return;
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// Raster the centeral part of the line.
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coord_t dx = std::abs(p2(0) - p1(0));
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coord_t dy = std::abs(p2(1) - p1(1));
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if (p1(0) < p2(0)) {
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int64_t ex = int64_t((ix + 1)*m_resolution - p1(0)) * int64_t(dy);
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if (p1(1) < p2(1)) {
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// x positive, y positive
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int64_t ey = int64_t((iy + 1)*m_resolution - p1(1)) * int64_t(dx);
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do {
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assert(ix <= ixb && iy <= iyb);
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if (ex < ey) {
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ey -= ex;
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ex = int64_t(dy) * m_resolution;
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ix += 1;
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}
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else if (ex == ey) {
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ex = int64_t(dy) * m_resolution;
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ey = int64_t(dx) * m_resolution;
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ix += 1;
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iy += 1;
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}
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else {
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assert(ex > ey);
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ex -= ey;
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ey = int64_t(dx) * m_resolution;
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iy += 1;
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}
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if (! visitor(iy, ix))
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return;
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} while (ix != ixb || iy != iyb);
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}
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else {
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// x positive, y non positive
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int64_t ey = int64_t(p1(1) - iy*m_resolution) * int64_t(dx);
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do {
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assert(ix <= ixb && iy >= iyb);
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if (ex <= ey) {
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ey -= ex;
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ex = int64_t(dy) * m_resolution;
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ix += 1;
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}
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else {
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ex -= ey;
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ey = int64_t(dx) * m_resolution;
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iy -= 1;
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}
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if (! visitor(iy, ix))
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return;
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} while (ix != ixb || iy != iyb);
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}
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}
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else {
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int64_t ex = int64_t(p1(0) - ix*m_resolution) * int64_t(dy);
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if (p1(1) < p2(1)) {
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// x non positive, y positive
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int64_t ey = int64_t((iy + 1)*m_resolution - p1(1)) * int64_t(dx);
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do {
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assert(ix >= ixb && iy <= iyb);
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if (ex < ey) {
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ey -= ex;
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ex = int64_t(dy) * m_resolution;
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ix -= 1;
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}
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else {
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assert(ex >= ey);
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ex -= ey;
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ey = int64_t(dx) * m_resolution;
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iy += 1;
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}
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if (! visitor(iy, ix))
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return;
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} while (ix != ixb || iy != iyb);
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}
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else {
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// x non positive, y non positive
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int64_t ey = int64_t(p1(1) - iy*m_resolution) * int64_t(dx);
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do {
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assert(ix >= ixb && iy >= iyb);
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if (ex < ey) {
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ey -= ex;
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ex = int64_t(dy) * m_resolution;
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ix -= 1;
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}
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else if (ex == ey) {
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// The lower edge of a grid cell belongs to the cell.
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// Handle the case where the ray may cross the lower left corner of a cell in a general case,
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// or a left or lower edge in a degenerate case (horizontal or vertical line).
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if (dx > 0) {
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ex = int64_t(dy) * m_resolution;
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ix -= 1;
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}
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if (dy > 0) {
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ey = int64_t(dx) * m_resolution;
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iy -= 1;
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}
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}
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else {
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assert(ex > ey);
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ex -= ey;
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ey = int64_t(dx) * m_resolution;
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iy -= 1;
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}
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if (! visitor(iy, ix))
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return;
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} while (ix != ixb || iy != iyb);
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}
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}
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}
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template<typename VISITOR> void visit_cells_intersecting_box(BoundingBox bbox, VISITOR &visitor) const
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{
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// End points of the line segment.
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bbox.min -= m_bbox.min;
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bbox.max -= m_bbox.min + Point(1, 1);
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// Get the cells of the end points.
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bbox.min /= m_resolution;
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bbox.max /= m_resolution;
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// Trim with the cells.
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bbox.min.x() = std::max<coord_t>(bbox.min.x(), 0);
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bbox.min.y() = std::max<coord_t>(bbox.min.y(), 0);
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bbox.max.x() = std::min<coord_t>(bbox.max.x(), (coord_t)m_cols - 1);
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bbox.max.y() = std::min<coord_t>(bbox.max.y(), (coord_t)m_rows - 1);
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for (coord_t iy = bbox.min.y(); iy <= bbox.max.y(); ++ iy)
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for (coord_t ix = bbox.min.x(); ix <= bbox.max.x(); ++ ix)
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if (! visitor(iy, ix))
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return;
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}
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std::pair<std::vector<std::pair<size_t, size_t>>::const_iterator, std::vector<std::pair<size_t, size_t>>::const_iterator> cell_data_range(coord_t row, coord_t col) const
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{
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const EdgeGrid::Grid::Cell &cell = m_cells[row * m_cols + col];
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return std::make_pair(m_cell_data.begin() + cell.begin, m_cell_data.begin() + cell.end);
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}
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std::pair<const Slic3r::Point&, const Slic3r::Point&> segment(const std::pair<size_t, size_t> &contour_and_segment_idx) const
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{
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const Slic3r::Points &ipts = *m_contours[contour_and_segment_idx.first];
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size_t ipt = contour_and_segment_idx.second;
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return std::pair<const Slic3r::Point&, const Slic3r::Point&>(ipts[ipt], ipts[(ipt + 1 == ipts.size()) ? 0 : ipt + 1]);
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}
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protected:
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struct Cell {
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Cell() : begin(0), end(0) {}
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size_t begin;
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size_t end;
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};
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void create_from_m_contours(coord_t resolution);
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#if 0
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bool line_cell_intersect(const Point &p1, const Point &p2, const Cell &cell);
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#endif
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bool cell_inside_or_crossing(int r, int c) const
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{
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if (r < 0 || (size_t)r >= m_rows ||
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c < 0 || (size_t)c >= m_cols)
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// The cell is outside the domain. Hoping that the contours were correctly oriented, so
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// there is a CCW outmost contour so the out of domain cells are outside.
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return false;
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const Cell &cell = m_cells[r * m_cols + c];
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return
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(cell.begin < cell.end) ||
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(! m_signed_distance_field.empty() && m_signed_distance_field[r * (m_cols + 1) + c] <= 0.f);
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}
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// Bounding box around the contours.
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BoundingBox m_bbox;
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// Grid dimensions.
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coord_t m_resolution;
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size_t m_rows;
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size_t m_cols;
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// Referencing the source contours.
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// This format allows one to work with any Slic3r fixed point contour format
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// (Polygon, ExPolygon, ExPolygonCollection etc).
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std::vector<const Slic3r::Points*> m_contours;
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// Referencing a contour and a line segment of m_contours.
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std::vector<std::pair<size_t, size_t> > m_cell_data;
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// Full grid of cells.
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std::vector<Cell> m_cells;
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// Distance field derived from the edge grid, seed filled by the Danielsson chamfer metric.
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// May be empty.
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std::vector<float> m_signed_distance_field;
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};
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#if 0
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// Debugging utility. Save the signed distance field.
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extern void save_png(const Grid &grid, const BoundingBox &bbox, coord_t resolution, const char *path);
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#endif /* SLIC3R_GUI */
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} // namespace EdgeGrid
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// Find all pairs of intersectiong edges from the set of polygons.
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extern std::vector<std::pair<EdgeGrid::Grid::ContourEdge, EdgeGrid::Grid::ContourEdge>> intersecting_edges(const Polygons &polygons);
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// Find all pairs of intersectiong edges from the set of polygons, highlight them in an SVG.
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extern void export_intersections_to_svg(const std::string &filename, const Polygons &polygons);
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} // namespace Slic3r
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#endif /* slic3r_EdgeGrid_hpp_ */
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