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new feature: Clip multi-part objects one by the other.

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This works the same way as if the XY compensation was set to a tiny value
before, but without the overhead of an offset.
This commit is contained in:
bubnikv 2017-02-14 12:36:04 +01:00
parent ce8973b33a
commit 420e387055
7 changed files with 50 additions and 41 deletions
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65
xs/src/libslic3r/PrintObject.cpp
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@ -221,7 +221,8 @@ PrintObject::invalidate_state_by_config_options(const std::vector<t_config_optio
steps.insert(posSlice);
this->reset_layer_height_profile();
}
else if (*opt_key == "xy_size_compensation") {
else if (*opt_key == "clip_multipart_objects"
|| *opt_key == "xy_size_compensation") {
steps.insert(posSlice);
} else if (*opt_key == "support_material"
|| *opt_key == "support_material_angle"
@ -1091,48 +1092,34 @@ end:
for (size_t layer_id = 0; layer_id < layers.size(); ++ layer_id) {
Layer *layer = this->layers[layer_id];
// apply size compensation
if (this->config.xy_size_compensation.value != 0.) {
float delta = float(scale_(this->config.xy_size_compensation.value));
if (layer->regions.size() == 1) {
// single region
// Apply size compensation and perform clipping of multi-part objects.
float delta = float(scale_(this->config.xy_size_compensation.value));
bool scale = delta != 0.f;
bool clip = this->config.clip_multipart_objects.value || delta > 0.f;
if (layer->regions.size() == 1) {
if (scale) {
// Single region, growing or shrinking.
LayerRegion *layerm = layer->regions.front();
layerm->slices.set(offset_ex(to_expolygons(std::move(layerm->slices.surfaces)), delta), stInternal);
} else {
if (delta < 0) {
// multiple regions, shrinking
// we apply the offset to the combined shape, then intersect it
// with the original slices for each region
Polygons region_slices;
for (size_t region_id = 0; region_id < layer->regions.size(); ++ region_id)
polygons_append(region_slices, layer->regions[region_id]->slices.surfaces);
Polygons slices = offset(union_(region_slices), delta);
for (size_t region_id = 0; region_id < layer->regions.size(); ++ region_id) {
LayerRegion *layerm = layer->regions[region_id];
layerm->slices.set(std::move(intersection_ex(slices, to_polygons(std::move(layerm->slices.surfaces)))), stInternal);
}
} else {
// multiple regions, growing
// this is an ambiguous case, since it's not clear how to grow regions where they are going to overlap
// so we give priority to the first one and so on
Polygons processed;
for (size_t region_id = 0;; ++ region_id) {
LayerRegion *layerm = layer->regions[region_id];
ExPolygons slices = offset_ex(to_expolygons(layerm->slices.surfaces), delta);
if (region_id > 0)
// Trim by the slices of already processed regions.
slices = diff_ex(to_polygons(std::move(slices)), processed);
if (region_id + 1 == layer->regions.size()) {
layerm->slices.set(std::move(slices), stInternal);
break;
}
polygons_append(processed, slices);
layerm->slices.set(std::move(slices), stInternal);
}
}
}
} else if (scale || clip) {
// Multiple regions, growing, shrinking or just clipping one region by the other.
// When clipping the regions, priority is given to the first regions.
Polygons processed;
for (size_t region_id = 0; region_id < layer->regions.size(); ++ region_id) {
LayerRegion *layerm = layer->regions[region_id];
ExPolygons slices = to_expolygons(std::move(layerm->slices.surfaces));
if (scale)
slices = offset_ex(slices, delta);
if (region_id > 0 && clip)
// Trim by the slices of already processed regions.
slices = diff_ex(to_polygons(std::move(slices)), processed);
if (clip && region_id + 1 < layer->regions.size())
// Collect the already processed regions to trim the to be processed regions.
polygons_append(processed, slices);
layerm->slices.set(std::move(slices), stInternal);
}
}
// Merge all regions' slices to get islands, chain them by a shortest path.
layer->make_slices();
}