Slic3r::EdgeGrid Namespace Reference

Classes
class	Contour
class	Grid

Functions
void	save_png (const Grid &grid, const BoundingBox &bbox, coord_t resolution, const char *path, size_t scale=1)

Function Documentation

save_png()

void Slic3r::EdgeGrid::save_png	(	const Grid &	grid,
		const BoundingBox &	bbox,
		coord_t	resolution,
		const char *	path,
		size_t	scale = 1
	)

{
    coord_t w = (bbox.max(0) - bbox.min(0) + resolution - 1) / resolution;
    coord_t h = (bbox.max(1) - bbox.min(1) + resolution - 1) / resolution;
 
  std::vector<uint8_t> pixels(w * h * 3, 0);
 
    const coord_t search_radius = grid.resolution() * 2;
  const coord_t display_blend_radius = grid.resolution() * 2;
  for (coord_t r = 0; r < h; ++r) {
      for (coord_t c = 0; c < w; ++ c) {
      unsigned char *pxl = pixels.data() + (((h - r - 1) * w) + c) * 3;
      Point pt(c * resolution + bbox.min(0), r * resolution + bbox.min(1));
      coordf_t min_dist;
      bool on_segment = true;
      #if 0
      if (grid.signed_distance_edges(pt, search_radius, min_dist, &on_segment)) {
      #else
      if (grid.signed_distance(pt, search_radius, min_dist)) {
      #endif
        float s = 255 * std::abs(min_dist) / float(display_blend_radius);
        int is = std::max(0, std::min(255, int(floor(s + 0.5f))));
        if (min_dist < 0) {
          if (on_segment) {
            pxl[0] = 255;
            pxl[1] = 255 - is;
            pxl[2] = 255 - is;
          } else {
            pxl[0] = 255;
            pxl[1] = 0;
            pxl[2] = 255 - is;
          }
        }
        else {
          if (on_segment) {
            pxl[0] = 255 - is;
            pxl[1] = 255 - is;
            pxl[2] = 255;
          } else {
            pxl[0] = 255 - is;
            pxl[1] = 0;
            pxl[2] = 255;
          }
        }
      } else {
        pxl[0] = 0;
        pxl[1] = 255;
        pxl[2] = 0;
      }
 
      float gridx = float(pt(0) - grid.bbox().min(0)) / float(grid.resolution());
      float gridy = float(pt(1) - grid.bbox().min(1)) / float(grid.resolution());
      if (gridx >= -0.4f && gridy >= -0.4f && gridx <= grid.cols() + 0.4f && gridy <= grid.rows() + 0.4f) {
        int ix = int(floor(gridx + 0.5f));
        int iy = int(floor(gridy + 0.5f));
        float dx = gridx - float(ix);
        float dy = gridy - float(iy);
        float d = sqrt(dx*dx + dy*dy) * float(grid.resolution()) / float(resolution);
        if (d < 1.f) {
          // Less than 1 pixel from the grid point.
          float t = 0.5f + 0.5f * d;
          pxl[0] = (unsigned char)(t * pxl[0]);
          pxl[1] = (unsigned char)(t * pxl[1]);
          pxl[2] = (unsigned char)(t * pxl[2]);
        }
      }
 
      float dgrid = fabs(min_dist) / float(grid.resolution());
      float igrid = floor(dgrid + 0.5f);
      dgrid = std::abs(dgrid - igrid) * float(grid.resolution()) / float(resolution);
      if (dgrid < 1.f) {
        // Less than 1 pixel from the grid point.
        float t = 0.5f + 0.5f * dgrid;
        pxl[0] = (unsigned char)(t * pxl[0]);
        pxl[1] = (unsigned char)(t * pxl[1]);
        pxl[2] = (unsigned char)(t * pxl[2]);
        if (igrid > 0.f) {
          // Other than zero iso contour.
          int g = pxl[1] + 255.f * (1.f - t);
          pxl[1] = std::min(g, 255);
        }
      }
    }
    }
 
  png::write_rgb_to_file_scaled(path, w, h, pixels, scale);
}

References floor(), Slic3r::grid(), Slic3r::BoundingBoxBase< PointType, APointsType >::max, Slic3r::BoundingBoxBase< PointType, APointsType >::min, scale(), sqrt(), and Slic3r::png::write_rgb_to_file_scaled().

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