void cairo_to_clipper(cairo_t* cr,
Polygons &pg,
int scaling_factor,
Transform transform)
{
if (scaling_factor > 8 || scaling_factor < 0)
throw clipperCairoException("cairo_to_clipper: invalid scaling factor");
double scaling = std::pow((double)10, scaling_factor);
pg.clear();
cairo_path_t *path = cairo_copy_path_flat(cr);
int poly_count = 0;
for (int i = 0; i < path->num_data; i += path->data[i].header.length) {
if( path->data[i].header.type == CAIRO_PATH_CLOSE_PATH) poly_count++;
}
pg.resize(poly_count);
int i = 0, pc = 0;
while (pc < poly_count)
{
int vert_count = 1;
int j = i;
while(j < path->num_data &&
path->data[j].header.type != CAIRO_PATH_CLOSE_PATH)
{
if (path->data[j].header.type == CAIRO_PATH_LINE_TO)
vert_count++;
j += path->data[j].header.length;
}
pg[pc].resize(vert_count);
if (path->data[i].header.type != CAIRO_PATH_MOVE_TO) {
pg.resize(pc);
break;
}
pg[pc][0].X = Round(path->data[i+1].point.x *scaling);
pg[pc][0].Y = Round(path->data[i+1].point.y *scaling);
if (transform != tNone)
transform_point(cr, transform, &pg[pc][0].X, &pg[pc][0].Y);
i += path->data[i].header.length;
j = 1;
while (j < vert_count && i < path->num_data &&
path->data[i].header.type == CAIRO_PATH_LINE_TO) {
pg[pc][j].X = Round(path->data[i+1].point.x *scaling);
pg[pc][j].Y = Round(path->data[i+1].point.y *scaling);
if (transform != tNone)
transform_point(cr, transform, &pg[pc][j].X, &pg[pc][j].Y);
j++;
i += path->data[i].header.length;
}
pc++;
i += path->data[i].header.length;
}
cairo_path_destroy(path);
}
void
SLAPrint::_infill_layer(size_t i, const Fill* _fill)
{
Layer &layer = this->layers[i];
const float shell_thickness = this->config.get_abs_value("perimeter_extrusion_width", this->config.layer_height.value);
// In order to detect what regions of this layer need to be solid,
// perform an intersection with layers within the requested shell thickness.
Polygons internal = layer.slices;
for (size_t j = 0; j < this->layers.size(); ++j) {
const Layer &other = this->layers[j];
if (abs(other.print_z - layer.print_z) > shell_thickness) continue;
if (j == 0 || j == this->layers.size()-1) {
internal.clear();
break;
} else if (i != j) {
internal = intersection(internal, other.slices);
if (internal.empty()) break;
}
}
// If we have no internal infill, just print the whole layer as a solid slice.
if (internal.empty()) return;
layer.solid = false;
const Polygons infill = offset(layer.slices, -scale_(shell_thickness));
// Generate solid infill
layer.solid_infill << diff_ex(infill, internal, true);
// Generate internal infill
{
std::auto_ptr<Fill> fill(_fill->clone());
fill->layer_id = i;
fill->z = layer.print_z;
ExtrusionPath templ(erInternalInfill);
templ.width = fill->spacing;
const ExPolygons internal_ex = intersection_ex(infill, internal);
for (ExPolygons::const_iterator it = internal_ex.begin(); it != internal_ex.end(); ++it) {
Polylines polylines = fill->fill_surface(Surface(stInternal, *it));
layer.infill.append(polylines, templ);
}
}
// Generate perimeter(s).
layer.perimeters << diff_ex(
layer.slices,
offset(layer.slices, -scale_(shell_thickness))
);
}
void clear() { contour.points.clear(); holes.clear(); }
