diff options
Diffstat (limited to 'svg-flatten/src/svg_path.cpp')
| -rw-r--r-- | svg-flatten/src/svg_path.cpp | 66 |
1 files changed, 34 insertions, 32 deletions
diff --git a/svg-flatten/src/svg_path.cpp b/svg-flatten/src/svg_path.cpp index ce2775d..f27f650 100644 --- a/svg-flatten/src/svg_path.cpp +++ b/svg-flatten/src/svg_path.cpp @@ -19,28 +19,26 @@ #include <cmath> #include <assert.h> #include <iostream> +#include <iomanip> #include <sstream> #include "cairo_clipper.hpp" #include "svg_import_defs.h" #include "svg_path.h" +#include "flatten.hpp" using namespace std; -static void clipper_add_cairo_path(cairo_t *cr, ClipperLib::Clipper &c, bool closed) { - ClipperLib::Paths in_poly; - ClipperLib::cairo::cairo_to_clipper(cr, in_poly, CAIRO_PRECISION, ClipperLib::cairo::tNone); - c.AddPaths(in_poly, ClipperLib::ptSubject, closed); -} - -static pair<bool, bool> path_to_clipper_via_cairo(cairo_t *cr, ClipperLib::Clipper &c_stroke, ClipperLib::Clipper &c_fill, const pugi::char_t *path_data) { +static pair<bool, bool> path_to_clipper_via_cairo(cairo_t *cr, ClipperLib::Clipper &c_stroke, ClipperLib::Clipper &c_fill, const pugi::char_t *path_data, double distance_tolerance_mm) { istringstream d(path_data); string cmd; double x, y, c1x, c1y, c2x, c2y; + ClipperLib::Path in_poly; + double scale = pow(10.0, CAIRO_PRECISION); + bool first = true; bool has_closed = false; - bool path_is_empty = true; int num_subpaths = 0; while (!d.eof()) { d >> cmd; @@ -48,24 +46,21 @@ static pair<bool, bool> path_to_clipper_via_cairo(cairo_t *cr, ClipperLib::Clipp assert(!first || cmd == "M"); if (cmd == "Z") { /* Close path */ - cairo_close_path(cr); - clipper_add_cairo_path(cr, c_stroke, /* closed= */ true); - clipper_add_cairo_path(cr, c_fill, /* closed= */ true); + c_stroke.AddPath(in_poly, ClipperLib::ptSubject, true); + c_fill.AddPath(in_poly, ClipperLib::ptSubject, true); + has_closed = true; - cairo_new_path(cr); - path_is_empty = true; + in_poly.clear(); num_subpaths += 1; } else if (cmd == "M") { /* Move to */ - if (!first && !path_is_empty) { - cairo_close_path(cr); - clipper_add_cairo_path(cr, c_stroke, /* closed= */ false); - clipper_add_cairo_path(cr, c_fill, /* closed= */ true); + if (!first && !in_poly.empty()) { + c_stroke.AddPath(in_poly, ClipperLib::ptSubject, false); + c_fill.AddPath(in_poly, ClipperLib::ptSubject, true); num_subpaths += 1; + in_poly.clear(); } - cairo_new_path (cr); - d >> x >> y; /* We need to transform all points ourselves here, and cannot use the transform feature of cairo_to_clipper: * Our transform may contain offsets, and clipper only passes its data into cairo's transform functions @@ -75,17 +70,18 @@ static pair<bool, bool> path_to_clipper_via_cairo(cairo_t *cr, ClipperLib::Clipp */ cairo_user_to_device(cr, &x, &y); assert (!d.fail()); - path_is_empty = true; - cairo_move_to(cr, x, y); + + in_poly.emplace_back(ClipperLib::IntPoint{(ClipperLib::cInt)round(x*scale), (ClipperLib::cInt)round(y*scale)}); } else if (cmd == "L") { /* Line to */ d >> x >> y; cairo_user_to_device(cr, &x, &y); assert (!d.fail()); - cairo_line_to(cr, x, y); - path_is_empty = false; + + in_poly.emplace_back(ClipperLib::IntPoint{(ClipperLib::cInt)round(x*scale), (ClipperLib::cInt)round(y*scale)}); } else { /* Curve to */ + double sx = x, sy = y; assert(cmd == "C"); d >> c1x >> c1y; /* first control point */ cairo_user_to_device(cr, &c1x, &c1y); @@ -94,16 +90,20 @@ static pair<bool, bool> path_to_clipper_via_cairo(cairo_t *cr, ClipperLib::Clipp d >> x >> y; /* end point */ cairo_user_to_device(cr, &x, &y); assert (!d.fail()); - cairo_curve_to(cr, c1x, c1y, c2x, c2y, x, y); - path_is_empty = false; + + gerbolyze::curve4_div c4div(distance_tolerance_mm); + c4div.run(sx, sy, c1x, c1y, c2x, c2y, x, y); + + for (auto &pt : c4div.points()) { + in_poly.emplace_back(ClipperLib::IntPoint{(ClipperLib::cInt)round(pt[0]*scale), (ClipperLib::cInt)round(pt[1]*scale)}); + } } first = false; } - if (!path_is_empty) { - cairo_close_path(cr); - clipper_add_cairo_path(cr, c_stroke, /* closed= */ false); - clipper_add_cairo_path(cr, c_fill, /* closed= */ true); + if (!in_poly.empty()) { + c_stroke.AddPath(in_poly, ClipperLib::ptSubject, false); + c_fill.AddPath(in_poly, ClipperLib::ptSubject, true); num_subpaths += 1; } @@ -117,14 +117,13 @@ void gerbolyze::load_svg_path(cairo_t *cr, const pugi::xml_node &node, ClipperLi /* For open paths, clipper does not correctly remove self-intersections. Thus, we pass everything into * clipper twice: Once with all paths set to "closed" to compute fill areas, and once with correct * open/closed properties for stroke offsetting. */ - cairo_set_tolerance (cr, curve_tolerance); /* FIXME make configurable, scale properly for units */ cairo_set_fill_rule(cr, CAIRO_FILL_RULE_WINDING); ClipperLib::Clipper c_stroke; ClipperLib::Clipper c_fill; c_stroke.StrictlySimple(true); c_fill.StrictlySimple(true); - auto res = path_to_clipper_via_cairo(cr, c_stroke, c_fill, path_data); + auto res = path_to_clipper_via_cairo(cr, c_stroke, c_fill, path_data, curve_tolerance); bool has_closed = res.first, has_multiple = res.second; if (!has_closed && !has_multiple) { @@ -145,9 +144,12 @@ void gerbolyze::load_svg_path(cairo_t *cr, const pugi::xml_node &node, ClipperLi auto le_min = -ClipperLib::loRange; auto le_max = ClipperLib::hiRange; ClipperLib::Path p = {{le_min, le_min}, {le_max, le_min}, {le_max, le_max}, {le_min, le_max}}; + c_stroke.AddPath(p, ClipperLib::ptClip, /* closed= */ true); c_stroke.Execute(ClipperLib::ctIntersection, ptree_stroke, fill_rule, ClipperLib::pftNonZero); - ptree_fill.Clear(); + + c_fill.AddPath(p, ClipperLib::ptClip, /* closed= */ true); + c_fill.Execute(ClipperLib::ctIntersection, ptree_fill, fill_rule, ClipperLib::pftNonZero); } else { /* We cannot clip the polygon here since that would produce incorrect results for our stroke. */ |