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Using ExPolygons instead of polygons to represents shape of letters(text)

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This commit is contained in:
Filip Sykala 2021-09-17 23:07:17 +02:00
parent 7faec616f0
commit 2b0408cc24
7 changed files with 105 additions and 58 deletions

39
src/libslic3r/Emboss.cpp
View file

@ -60,7 +60,8 @@ std::optional<Emboss::Glyph> Privat::get_glyph(stbtt_fontinfo &font_info, int un
stbtt__point *points = stbtt_FlattenCurves(vertices, num_verts,
flatness, &contour_lengths, &num_countour, font_info.userdata);
glyph.polygons.reserve(num_countour);
Polygons glyph_polygons;
glyph_polygons.reserve(num_countour);
size_t pi = 0; // point index
for (size_t ci = 0; ci < num_countour; ++ci) {
int length = contour_lengths[ci];
@ -85,10 +86,10 @@ std::optional<Emboss::Glyph> Privat::get_glyph(stbtt_fontinfo &font_info, int un
// change outer cw to ccw and inner ccw to cw order
std::reverse(pts.begin(), pts.end());
glyph.polygons.emplace_back(pts);
glyph_polygons.emplace_back(pts);
}
// fix for bad defined fonts
glyph.polygons = union_(glyph.polygons);
glyph.polygons = union_ex(glyph_polygons);
// inner cw - hole
// outer ccw - contour
return glyph;
@ -480,14 +481,14 @@ std::optional<Emboss::Glyph> Emboss::letter2glyph(const Font &font,
return Privat::get_glyph(*font_info_opt, (int) letter, flatness);
}
Polygons Emboss::text2polygons(Font & font,
ExPolygons Emboss::text2shapes(Font & font,
const char * text,
const FontProp &font_prop)
{
std::optional<stbtt_fontinfo> font_info_opt;
Point cursor(0, 0);
Polygons result;
ExPolygons result;
std::wstring ws = boost::nowide::widen(text);
for (wchar_t wc: ws){
@ -505,7 +506,7 @@ Polygons Emboss::text2polygons(Font & font,
if (!font_info_opt.has_value()) {
font_info_opt = Privat::load_font_info(font);
// can load font info?
if (!font_info_opt.has_value()) return Polygons();
if (!font_info_opt.has_value()) return {};
}
glyph_opt = Privat::get_glyph(*font_info_opt, unicode,
font_prop.flatness);
@ -516,16 +517,16 @@ Polygons Emboss::text2polygons(Font & font,
}
// move glyph to cursor position
Polygons polygons = glyph_opt->polygons; // copy
for (Polygon &polygon : polygons)
ExPolygons polygons = glyph_opt->polygons; // copy
for (ExPolygon &polygon : polygons)
polygon.translate(cursor);
cursor.x() += glyph_opt->advance_width + font_prop.char_gap;
polygons_append(result, polygons);
expolygons_append(result, polygons);
}
return union_(result);
return union_ex(result);
}
indexed_triangle_set Emboss::polygons2model(const Polygons &shape2d,
indexed_triangle_set Emboss::polygons2model(const ExPolygons &shape2d,
const IProject &projection)
{
indexed_triangle_set result;
@ -536,12 +537,17 @@ indexed_triangle_set Emboss::polygons2model(const Polygons &shape2d,
std::vector<Vec3f> back_points;
back_points.reserve(count_point);
for (const Polygon &polygon : shape2d) {
for (const Point &p : polygon.points) {
auto insert_point = [&projection, &front_points,
&back_points](const Polygon& polygon) {
for (const Point& p : polygon.points) {
auto p2 = projection.project(p);
front_points.emplace_back(p2.first);
back_points.emplace_back(p2.second);
}
};
for (const ExPolygon &expolygon : shape2d) {
insert_point(expolygon.contour);
for (const Polygon &hole : expolygon.holes) insert_point(hole);
}
// insert back points, front are already in
result.vertices.insert(result.vertices.end(),
@ -561,7 +567,7 @@ indexed_triangle_set Emboss::polygons2model(const Polygons &shape2d,
// quads around - zig zag by triangles
size_t polygon_offset = 0;
for (const Polygon &polygon : shape2d) {
auto add_quads = [&result,&polygon_offset, count_point](const Polygon& polygon) {
uint32_t polygon_points = polygon.points.size();
for (uint32_t p = 0; p < polygon_points; p++) {
uint32_t i = polygon_offset + p;
@ -575,6 +581,11 @@ indexed_triangle_set Emboss::polygons2model(const Polygons &shape2d,
result.indices.emplace_back(ip2, ip, i2);
}
polygon_offset += polygon_points;
};
for (const ExPolygon &expolygon : shape2d) {
add_quads(expolygon.contour);
for (const Polygon &hole : expolygon.holes) add_quads(hole);
}
return result;
}

6
src/libslic3r/Emboss.hpp
View file

@ -41,7 +41,7 @@ public:
// description of one letter
struct Glyph
{
Polygons polygons;
ExPolygons polygons;
int advance_width, left_side_bearing;
};
// cache for glyph by unicode
@ -94,7 +94,7 @@ public:
/// <param name="text">Characters to convert</param>
/// <param name="font_prop">User defined property of the font</param>
/// <returns>Inner polygon cw(outer ccw)</returns>
static Polygons text2polygons(Font & font,
static ExPolygons text2shapes(Font & font,
const char * text,
const FontProp &font_prop);
@ -123,7 +123,7 @@ public:
/// <param name="shape2d">text or image</param>
/// <param name="projection">Define transformation from 2d to 3d(orientation, position, scale, ...)</param>
/// <returns>Projected shape into space</returns>
static indexed_triangle_set polygons2model(const Polygons &shape2d, const IProject& projection);
static indexed_triangle_set polygons2model(const ExPolygons &shape2d, const IProject& projection);
class ProjectZ : public IProject
{

24
src/libslic3r/ExPolygon.hpp
View file

@ -78,6 +78,17 @@ public:
inline bool operator==(const ExPolygon &lhs, const ExPolygon &rhs) { return lhs.contour == rhs.contour && lhs.holes == rhs.holes; }
inline bool operator!=(const ExPolygon &lhs, const ExPolygon &rhs) { return lhs.contour != rhs.contour || lhs.holes != rhs.holes; }
inline size_t count_points(const ExPolygons &expolys)
{
size_t n_points = 0;
for (const auto &expoly : expolys) {
n_points += expoly.contour.points.size();
for (const auto &hole : expoly.holes)
n_points += hole.points.size();
}
return n_points;
}
// Count a nuber of polygons stored inside the vector of expolygons.
// Useful for allocating space for polygons when converting expolygons to polygons.
inline size_t number_polygons(const ExPolygons &expolys)
@ -90,11 +101,8 @@ inline size_t number_polygons(const ExPolygons &expolys)
inline Lines to_lines(const ExPolygon &src)
{
size_t n_lines = src.contour.points.size();
for (size_t i = 0; i < src.holes.size(); ++ i)
n_lines += src.holes[i].points.size();
Lines lines;
lines.reserve(n_lines);
lines.reserve(count_points(src));
for (size_t i = 0; i <= src.holes.size(); ++ i) {
const Polygon &poly = (i == 0) ? src.contour : src.holes[i - 1];
for (Points::const_iterator it = poly.points.begin(); it != poly.points.end()-1; ++it)
@ -106,14 +114,8 @@ inline Lines to_lines(const ExPolygon &src)
inline Lines to_lines(const ExPolygons &src)
{
size_t n_lines = 0;
for (ExPolygons::const_iterator it_expoly = src.begin(); it_expoly != src.end(); ++ it_expoly) {
n_lines += it_expoly->contour.points.size();
for (size_t i = 0; i < it_expoly->holes.size(); ++ i)
n_lines += it_expoly->holes[i].points.size();
}
Lines lines;
lines.reserve(n_lines);
lines.reserve(count_points(src));
for (ExPolygons::const_iterator it_expoly = src.begin(); it_expoly != src.end(); ++ it_expoly) {
for (size_t i = 0; i <= it_expoly->holes.size(); ++ i) {
const Points &points = ((i == 0) ? it_expoly->contour : it_expoly->holes[i - 1]).points;

74
src/libslic3r/Triangulation.cpp
View file

@ -6,8 +6,27 @@
using namespace Slic3r;
Triangulation::Indices Triangulation::triangulate(const Points & points,
const HalfEdges &half_edges)
namespace Slic3r::Private {
inline void insert_points(Points& points, const Polygon &polygon) {
points.insert(points.end(), polygon.points.begin(), polygon.points.end());
}
inline void insert_edge(Slic3r::Triangulation::HalfEdges &edges, uint32_t &offset, const Polygon &polygon) {
const Points &pts = polygon.points;
for (uint32_t i = 1; i < pts.size(); ++i) {
uint32_t i2 = i + offset;
edges.insert({i2 - 1, i2});
}
uint32_t size = static_cast<uint32_t>(pts.size());
// add connection from first to last point
edges.insert({offset + size - 1, offset});
offset += size;
}
}
Triangulation::Indices Triangulation::triangulate(const Points &points, const HalfEdges &half_edges)
{
// IMPROVE use int point insted of float !!!
@ -62,10 +81,10 @@ Triangulation::Indices Triangulation::triangulate(const Points & points,
Triangulation::Indices Triangulation::triangulate(const Polygon &polygon)
{
const Points & pts = polygon.points;
std::set<std::pair<uint32_t, uint32_t>> edges;
for (uint32_t i = 1; i < pts.size(); ++i) edges.insert({i - 1, i});
edges.insert({(uint32_t) pts.size() - 1, uint32_t(0)});
const Points &pts = polygon.points;
HalfEdges edges;
uint32_t offset = 0;
Private::insert_edge(edges, offset, polygon);
Triangulation::Indices indices = triangulate(pts, edges);
remove_outer(indices, edges);
return indices;
@ -76,23 +95,38 @@ Triangulation::Indices Triangulation::triangulate(const Polygons &polygons)
size_t count = count_points(polygons);
Points points;
points.reserve(count);
for (const Polygon &polygon : polygons)
points.insert(points.end(), polygon.points.begin(),
polygon.points.end());
std::set<std::pair<uint32_t, uint32_t>> edges;
uint32_t offset = 0;
HalfEdges edges;
uint32_t offset = 0;
for (const Polygon &polygon : polygons) {
const Points &pts = polygon.points;
for (uint32_t i = 1; i < pts.size(); ++i) {
uint32_t i2 = i + offset;
edges.insert({i2 - 1, i2});
}
uint32_t size = static_cast<uint32_t>(pts.size());
// add connection from first to last point
edges.insert({offset + size - 1, offset});
offset += size;
Private::insert_points(points, polygon);
Private::insert_edge(edges, offset, polygon);
}
Triangulation::Indices indices = triangulate(points, edges);
remove_outer(indices, edges);
return indices;
}
Triangulation::Indices Triangulation::triangulate(const ExPolygons &expolygons)
{
size_t count = count_points(expolygons);
Points points;
points.reserve(count);
HalfEdges edges;
uint32_t offset = 0;
for (const ExPolygon &expolygon : expolygons) {
Private::insert_points(points, expolygon.contour);
Private::insert_edge(edges, offset, expolygon.contour);
for (const Polygon &hole : expolygon.holes) {
Private::insert_points(points, hole);
Private::insert_edge(edges, offset, hole);
}
}
Triangulation::Indices indices = triangulate(points, edges);
remove_outer(indices, edges);
return indices;

1
src/libslic3r/Triangulation.hpp
View file

@ -30,6 +30,7 @@ public:
const HalfEdges &half_edges);
static Indices triangulate(const Polygon &polygon);
static Indices triangulate(const Polygons &polygons);
static Indices triangulate(const ExPolygons &expolygons);
/// <summary>
/// Filter out triagles without both side edge or inside half edges

11
src/slic3r/GUI/Gizmos/GLGizmoEmboss.cpp
View file

@ -221,13 +221,13 @@ ModelVolume *GLGizmoEmboss::get_selected_volume(const Selection &selection,
bool GLGizmoEmboss::process() {
if (!m_font.has_value()) return false;
Polygons polygons = Emboss::text2polygons(*m_font, m_text.c_str(), m_font_prop);
if (polygons.empty()) return false;
ExPolygons shapes = Emboss::text2shapes(*m_font, m_text.c_str(), m_font_prop);
if (shapes.empty()) return false;
float scale = m_font_prop.size_in_mm / m_font->ascent;
auto project = std::make_unique<Emboss::ProjectScale>(
std::make_unique<Emboss::ProjectZ>(m_font_prop.emboss / scale), scale);
indexed_triangle_set its = Emboss::polygons2model(polygons, *project);
indexed_triangle_set its = Emboss::polygons2model(shapes, *project);
if (its.indices.empty()) return false;
// add object
@ -302,8 +302,7 @@ bool GLGizmoEmboss::process() {
void GLGizmoEmboss::close() {
// close gizmo == open it again
GLGizmosManager &gizmos_mgr = m_parent.get_gizmos_manager();
gizmos_mgr.open_gizmo(GLGizmosManager::EType::Emboss);
m_parent.get_gizmos_manager().open_gizmo(GLGizmosManager::Emboss);
}
void GLGizmoEmboss::draw_add_button() {
@ -408,7 +407,7 @@ void GLGizmoEmboss::draw_window()
process();
if (ImGui::Button(_L("Close").c_str())) process();
if (ImGui::Button(_L("Close").c_str())) close();
// Option to create text volume when reselect volumes
m_imgui->disabled_begin(!m_font.has_value());

8
tests/libslic3r/test_meshboolean.cpp
View file

@ -51,9 +51,9 @@ TEST_CASE("Add TriangleMeshes", "[MeshBoolean]")
#include "libslic3r/Emboss.hpp"
Polygons ttf2polygons(const char * font_name, char letter, float flatness = 1.f) {
ExPolygons ttf2polygons(const char * font_name, char letter, float flatness = 1.f) {
auto font = Emboss::load_font(font_name);
if (!font.has_value()) return Polygons();
if (!font.has_value()) return ExPolygons();
return Emboss::letter2glyph(*font, letter, flatness)->polygons;
}
@ -619,13 +619,13 @@ TEST_CASE("Emboss polygon", "[MeshBoolean]")
const char *font_name = "C:/windows/fonts/arialbd.ttf";
char letter = '%';
float flatness = 2.;
Polygons polygons = ttf2polygons(font_name, letter, flatness);
store_to_svg(polygons);
ExPolygons espolygons = ttf2polygons(font_name, letter, flatness);
//TriangleMesh tm = make_sphere(1., 1.); tm.scale(10.f);
TriangleMesh tm = make_cube(10., 5., 2.);
tm.translate(Vec3f(0, 0, 1.7));
Polygons polygons;
polygons = {Polygon({{1, 1}, {1, 2}, {2, 2}, {2, 1}})}; // rectangle CW
polygons = {Polygon({{1, 1}, {2, 1}, {2, 2}, {1, 2}})}; // rectangle CCW