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Torus visualization of base line.

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Filip Sykala - NTB T15p 2023-08-09 14:02:45 +02:00
parent a482635f3e
commit eebb2ea4d0
1 changed files with 64 additions and 32 deletions
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94
src/slic3r/GUI/TextLines.cpp
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@ -89,6 +89,8 @@ indexed_triangle_set its_create_belt(const Slic3r::Polygon &polygon, float width
return model; return model;
} }
// Be careful it is not water tide and contain self intersection
// For visualization purposes it doesnt matter
indexed_triangle_set its_create_torus(const Slic3r::Polygon &polygon, float radius, size_t steps = 20) indexed_triangle_set its_create_torus(const Slic3r::Polygon &polygon, float radius, size_t steps = 20)
{ {
assert(!polygon.empty()); assert(!polygon.empty());
@ -117,11 +119,6 @@ indexed_triangle_set its_create_torus(const Slic3r::Polygon &polygon, float radi
Vec2f dir = prev + next; Vec2f dir = prev + next;
return Vec2f(-dir.x(), dir.y()); return Vec2f(-dir.x(), dir.y());
}; };
std::vector<Vec2f> points_norm(points_d.size());
points_norm.front() = calc_norm(line_norm.back(), line_norm[1]);
for (size_t i = 1; i < points_d.size() - 1; ++i)
points_norm[i] = calc_norm(line_norm[i - 1], line_norm[i + 1]);
points_norm.back() = calc_norm(line_norm[points_d.size() - 2], line_norm.front());
// precalculate sinus and cosinus // precalculate sinus and cosinus
double angle_step = 2 * M_PI / steps; double angle_step = 2 * M_PI / steps;
@ -135,38 +132,73 @@ indexed_triangle_set its_create_torus(const Slic3r::Polygon &polygon, float radi
); );
} }
indexed_triangle_set sphere = its_make_sphere(radius, 2 * PI / steps);
// create torus model along polygon path // create torus model along polygon path
indexed_triangle_set model; indexed_triangle_set model;
model.vertices.reserve(steps * count); model.vertices.reserve(2 * steps * count + sphere.vertices.size()*count);
model.indices.reserve(2 * steps * count); model.indices.reserve(2 * steps * count + sphere.indices.size()*count);
const Vec2f *prev_prev_point_d = &points_d[count-2]; // one before back
const Vec2f *prev_point_d = &points_d.back();
auto calc_angle = [](const Vec2f &d0, const Vec2f &d1) {
double dot = d0.dot(d1);
double det = d0.x() * d1.y() - d0.y() * d1.x(); // Determinant
return std::atan2(det, dot); // atan2(y, x) or atan2(sin, cos)
};
// opposit previos direction of line - for calculate angle
Vec2f opposit_prev_dir = (*prev_prev_point_d) - (*prev_point_d);
for (size_t i = 0; i < count; ++i) { for (size_t i = 0; i < count; ++i) {
const Vec2f point_d = points_d[i];
const Vec2f norm = points_norm[i]; const Vec2f & point_d = points_d[i];
// line segment direction
Vec2f dir = point_d - (*prev_point_d);
double angle = calc_angle(opposit_prev_dir, dir);
double allowed_preccission = 1e-6;
if (angle >= (PI - allowed_preccission) ||
angle <= (-PI + allowed_preccission))
continue; // it is almost line
// perpendicular direction to line
Vec2d p_dir(dir.y(), -dir.x());
p_dir.normalize(); // Should done with double preccission
// p_dir is tube unit side vector
// tube unit top vector is z direction
// Tube
int prev_index = model.vertices.size() + 2 * sin_cos.size() - 2;
for (const auto &[s, c] : sin_cos) { for (const auto &[s, c] : sin_cos) {
Vec2f xy = s * norm + point_d; Vec2f side = (s * p_dir).cast<float>();
model.vertices.emplace_back(xy.x(), xy.y(), c); Vec2f xy0 = side + (*prev_point_d);
Vec2f xy1 = side + point_d;
model.vertices.emplace_back(xy0.x(), xy0.y(), c); // pointing of prev index
model.vertices.emplace_back(xy1.x(), xy1.y(), c);
// create triangle indices
int f0 = prev_index;
int s0 = f0 + 1;
int f1 = model.vertices.size() - 2;
int s1 = f1 + 1;
prev_index = f1;
model.indices.emplace_back(s0, f0, s1);
model.indices.emplace_back(f1, s1, f0);
} }
prev_prev_point_d = prev_point_d;
prev_point_d = &point_d;
opposit_prev_dir = -dir;
} }
unsigned int prev_i = count - 1; // sphere on each point
for (unsigned int i = 0; i < count; ++i) { for (Vec2f& p: points_d){
// TODO: solve <180, =180 and >180 angle indexed_triangle_set sphere_copy = sphere;
// to not create self intersection its_translate(sphere_copy, Vec3f(p.x(), p.y(), 0.f));
its_merge(model, sphere_copy);
// t .. top
// b .. bottom
unsigned int prev_t = (prev_i+1) * steps - 1;
unsigned int t = (i+1) * steps - 1;
for (size_t s = 0; s < steps; ++s) {
unsigned int prev_b = prev_i * steps + s;
unsigned int b = i * steps + s;
model.indices.emplace_back(prev_t, prev_b, t);
model.indices.emplace_back(b, t, prev_b);
prev_t = prev_b;
t = b;
}
prev_i = i;
} }
return model; return model;
} }
@ -222,8 +254,8 @@ indexed_triangle_set create_its(const TextLines &lines)
for (const TextLine &line : lines) { for (const TextLine &line : lines) {
const Slic3r::Polygon &polygon = line.polygon; const Slic3r::Polygon &polygon = line.polygon;
if (polygon.empty()) continue; if (polygon.empty()) continue;
indexed_triangle_set line_its = its_create_belt(polygon, model_half_width); //indexed_triangle_set line_its = its_create_belt(polygon, model_half_width);
//indexed_triangle_set line_its = its_create_torus(polygon, model_half_width); indexed_triangle_set line_its = its_create_torus(polygon, model_half_width);
auto transl = Eigen::Translation3d(0., line.y, 0.); auto transl = Eigen::Translation3d(0., line.y, 0.);
Transform3d tr = transl * get_rotation(); Transform3d tr = transl * get_rotation();
its_transform(line_its, tr); its_transform(line_its, tr);