svg-flatten: add drill handling to outline mode

10 files changed, 106 insertions, 3 deletions

diff --git a/svg-flatten/src/main.cpp b/svg-flatten/src/main.cpp
index 817ba67..188aa57 100644
--- a/svg-flatten/src/main.cpp
+++ b/svg-flatten/src/main.cpp
@@ -79,6 +79,9 @@ int main(int argc, char **argv) {
             {"curve_tolerance", {"-c", "--curve-tolerance"},
                 "Tolerance for curve flattening in mm. Default: 0.1mm.",
                 1},
+            {"drill_test_polsby_popper_tolerance", {"--drill-test-tolerance"},
+                "Tolerance for identifying circles as drills in outline mode",
+                1},
             {"no_header", {"--no-header"},
                 "Do not export output format header/footer, only export the primitives themselves",
                 0},
@@ -291,6 +294,7 @@ int main(int argc, char **argv) {
 
     double min_feature_size = args["min_feature_size"].as<double>(0.1); /* mm */
     double curve_tolerance = args["curve_tolerance"].as<double>(0.1); /* mm */
+    double drill_test_polsby_popper_tolerance = args["drill_test_polsby_popper_tolerance"].as<double>(0.1); /* mm */
 
     string ending = "";
     auto idx = in_f_name.rfind(".");
@@ -423,6 +427,7 @@ int main(int argc, char **argv) {
     RenderSettings rset {
         min_feature_size,
         curve_tolerance,
+        drill_test_polsby_popper_tolerance,
         vec_sel,
         outline_mode,
         flip_svg_colors,
diff --git a/svg-flatten/src/nopencv.cpp b/svg-flatten/src/nopencv.cpp
index 121e9e1..e157ab5 100644
--- a/svg-flatten/src/nopencv.cpp
+++ b/svg-flatten/src/nopencv.cpp
@@ -483,6 +483,33 @@ double gerbolyze::nopencv::polygon_area(Polygon_i &poly) {
     return acc / 2;
 }
 
+double gerbolyze::nopencv::polygon_perimeter(Polygon_i &poly) {
+    double acc = 0;
+    size_t prev = poly.size() - 1;
+    for (size_t cur=0; cur<poly.size(); cur++) {
+        double dx = poly[cur][0] - poly[prev][0];
+        double dy = poly[cur][1] - poly[prev][1];
+        acc += sqrt(dx*dx + dy*dy);
+        prev = cur;
+    }
+    return acc;
+}
+
+d2p gerbolyze::nopencv::polygon_centroid(Polygon_i &poly) {
+    double acc_x = 0, acc_y = 0;
+
+    double area = polygon_area(poly);
+    size_t prev = poly.size() - 1;
+    for (size_t cur=0; cur<poly.size(); cur++) {
+        double a = poly[prev][1]*poly[cur][0] - poly[cur][1]*poly[prev][0];
+        acc_x += (poly[prev][0] + poly[cur][0]) * a;
+        acc_y += (poly[prev][1] + poly[cur][1]) * a;
+        prev = cur;
+    }
+
+    return { acc_x / (6*area), acc_y / (6*area) };
+}
+
 template<typename T>
 gerbolyze::nopencv::Image<T>::Image(int size_x, int size_y, const T *data) {
     assert(size_x > 0 && size_x < 100000);
diff --git a/svg-flatten/src/nopencv.hpp b/svg-flatten/src/nopencv.hpp
index 5dd399d..bbc190b 100644
--- a/svg-flatten/src/nopencv.hpp
+++ b/svg-flatten/src/nopencv.hpp
@@ -119,6 +119,8 @@ namespace gerbolyze {
         ContourCallback simplify_contours_douglas_peucker(ContourCallback cb);
 
         double polygon_area(Polygon_i &poly);
+        double polygon_perimeter(Polygon_i &poly);
+        d2p polygon_centroid(Polygon_i &poly);
     }
 }
 
diff --git a/svg-flatten/src/out_dilater.cpp b/svg-flatten/src/out_dilater.cpp
index e9aefa8..a5b0619 100644
--- a/svg-flatten/src/out_dilater.cpp
+++ b/svg-flatten/src/out_dilater.cpp
@@ -84,3 +84,7 @@ Dilater &Dilater::operator<<(const Polygon &poly) {
     return *this;
 }
 
+Dilater &Dilater::operator<<(const ApertureToken &ap) {
+    m_sink << ApertureToken(ap.m_size + 2*m_dilation);
+    return *this;
+}
diff --git a/svg-flatten/src/out_flattener.cpp b/svg-flatten/src/out_flattener.cpp
index 8868ca2..0eae854 100644
--- a/svg-flatten/src/out_flattener.cpp
+++ b/svg-flatten/src/out_flattener.cpp
@@ -152,6 +152,16 @@ Flattener &Flattener::operator<<(const LayerNameToken &layer_name) {
     return *this;
 }
 
+Flattener &Flattener::operator<<(const DrillToken &tok) {
+    m_sink << tok;
+    return *this;
+}
+
+Flattener &Flattener::operator<<(const ApertureToken &tok) {
+    m_sink << tok;
+    return *this;
+}
+
 Flattener &Flattener::operator<<(const Polygon &poly) {
     if (m_current_polarity == GRB_POL_DARK) {
         d->add_dark_polygon(poly);
diff --git a/svg-flatten/src/out_gerber.cpp b/svg-flatten/src/out_gerber.cpp
index b1c5875..c43d07d 100644
--- a/svg-flatten/src/out_gerber.cpp
+++ b/svg-flatten/src/out_gerber.cpp
@@ -65,6 +65,7 @@ SimpleGerberOutput& SimpleGerberOutput::operator<<(const ApertureToken &ap) {
     if (ap.m_size == m_current_aperture) {
         return *this;
     }
+
     m_current_aperture = ap.m_size;
     m_aperture_num += 1;
 
@@ -123,6 +124,17 @@ SimpleGerberOutput& SimpleGerberOutput::operator<<(const Polygon &poly) {
     return *this;
 }
 
+SimpleGerberOutput &SimpleGerberOutput::operator<<(const DrillToken &tok) {
+    double x = round((tok.m_center[0] * m_scale + m_offset[0]) * m_gerber_scale);
+    double y = round((m_height - tok.m_center[1] * m_scale + m_offset[1]) * m_gerber_scale);
+
+    m_out << "X" << setw(m_digits_int + m_digits_frac) << setfill('0') << std::internal /* isn't C++ a marvel of engineering? */ << (long long int)x
+          << "Y" << setw(m_digits_int + m_digits_frac) << setfill('0') << std::internal << (long long int)y
+          << "D03*" << endl;
+
+    return *this;
+}
+
 void SimpleGerberOutput::footer_impl() {
     m_out << "M02*" << endl;
 }
diff --git a/svg-flatten/src/out_scaler.cpp b/svg-flatten/src/out_scaler.cpp
index 9b7de4e..0320d69 100644
--- a/svg-flatten/src/out_scaler.cpp
+++ b/svg-flatten/src/out_scaler.cpp
@@ -29,6 +29,7 @@
 using namespace gerbolyze;
 using namespace std;
 
+/* FIXME thoroughly test ApertureToken scale handling */
 void PolygonScaler::header(d2p origin, d2p size) {
     m_sink.header({origin[0] * m_scale, origin[1] * m_scale}, {size[0] * m_scale, size[1] * m_scale});
 }
@@ -45,7 +46,11 @@ PolygonScaler &PolygonScaler::operator<<(const LayerNameToken &layer_name) {
 
 PolygonScaler &PolygonScaler::operator<<(GerberPolarityToken pol) {
     m_sink << pol;
+    return *this;
+}
 
+PolygonScaler &PolygonScaler::operator<<(const ApertureToken &tok) {
+    m_sink << ApertureToken(tok.m_size * m_scale);
     return *this;
 }
 
@@ -59,3 +64,8 @@ PolygonScaler &PolygonScaler::operator<<(const Polygon &poly) {
     return *this;
 }
 
+PolygonScaler &PolygonScaler::operator<<(const DrillToken &tok) {
+    d2p new_center { tok.m_center[0] * m_scale, tok.m_center[1] * m_scale };
+    m_sink << DrillToken(new_center);
+    return *this;
+}
diff --git a/svg-flatten/src/out_sexp.cpp b/svg-flatten/src/out_sexp.cpp
index 1a7f1d0..6760920 100644
--- a/svg-flatten/src/out_sexp.cpp
+++ b/svg-flatten/src/out_sexp.cpp
@@ -135,6 +135,10 @@ KicadSexpOutput &KicadSexpOutput::operator<<(const Polygon &poly) {
     return *this;
 }
 
+KicadSexpOutput &KicadSexpOutput::operator<<(const DrillToken &tok) {
+    return *this;
+}
+
 void KicadSexpOutput::footer_impl() {
     m_out << ")" << endl;
 }
diff --git a/svg-flatten/src/out_svg.cpp b/svg-flatten/src/out_svg.cpp
index d94edc0..4ecd979 100644
--- a/svg-flatten/src/out_svg.cpp
+++ b/svg-flatten/src/out_svg.cpp
@@ -77,6 +77,10 @@ SimpleSVGOutput &SimpleSVGOutput::operator<<(const Polygon &poly) {
     return *this;
 }
 
+SimpleSVGOutput &SimpleSVGOutput::operator<<(const DrillToken &tok) {
+    return *this;
+}
+
 void SimpleSVGOutput::footer_impl() {
     //cerr << "svg: footer" << endl;
     m_out << "</svg>" << endl;
diff --git a/svg-flatten/src/svg_doc.cpp b/svg-flatten/src/svg_doc.cpp
index fb8d311..7ff0a11 100644
--- a/svg-flatten/src/svg_doc.cpp
+++ b/svg-flatten/src/svg_doc.cpp
@@ -18,6 +18,7 @@
 
 #include <iostream>
 #include <fstream>
+#include <cmath>
 
 #include <gerbolyze.hpp>
 #include "svg_import_defs.h"
@@ -25,6 +26,7 @@
 #include "svg_geom.h"
 #include "svg_path.h"
 #include "vec_core.h"
+#include "nopencv.hpp"
 
 using namespace gerbolyze;
 using namespace std;
@@ -243,7 +245,6 @@ void gerbolyze::SVGDocument::export_svg_path(RenderContext &ctx, const pugi::xml
     }
 
     /* Load path from SVG path data and transform into document units. */
-    /* FIXME transform stroke width here? */
     stroke_width = ctx.mat().doc2phys_dist(stroke_width);
 
     Paths stroke_open, stroke_closed;
@@ -260,6 +261,31 @@ void gerbolyze::SVGDocument::export_svg_path(RenderContext &ctx, const pugi::xml
     /* Skip filling for transparent fills. In outline mode, skip filling if a stroke is also set to avoid double lines.
      */
     if (has_fill && !(ctx.settings().outline_mode && has_stroke)) {
+        /* In outline mode, identify drills before applying clip */
+        if (ctx.settings().outline_mode && fill_color != GRB_PATTERN_FILL) {
+            /* Polsby-Popper test */
+            for (auto &p : fill_paths) {
+                Polygon_i geom_poly(p.size());
+                for (size_t i=0; i<p.size(); i++) {
+                    geom_poly[i] = { p[i].X, p[i].Y };
+                }
+
+                double area = nopencv::polygon_area(geom_poly);
+                double polsby_popper = 4*M_PI * area / pow(nopencv::polygon_perimeter(geom_poly), 2);
+                polsby_popper = fabs(fabs(polsby_popper) - 1.0);
+                if (polsby_popper < ctx.settings().drill_test_polsby_popper_tolerance) {
+                    d2p centroid = nopencv::polygon_centroid(geom_poly);
+                    centroid[0] /= clipper_scale;
+                    centroid[1] /= clipper_scale;
+                    double diameter = sqrt(4*fabs(area)/M_PI) / clipper_scale;
+                    diameter = ctx.mat().doc2phys_dist(diameter); /* FIXME is this correct w.r.t. PolygonScaler? */
+                    diameter = round(diameter * 1000.0) / 1000.0; /* Round to micrometer precsion; FIXME: make configurable */
+                    ctx.sink() << ApertureToken(diameter) << DrillToken(ctx.mat().doc2phys(centroid));
+                }
+            }
+            return;
+        }
+
         /* Clip paths. Consider all paths closed for filling. */
         if (!ctx.clip().empty()) {
             Clipper c;
@@ -306,7 +332,7 @@ void gerbolyze::SVGDocument::export_svg_path(RenderContext &ctx, const pugi::xml
                 if (ctx.settings().outline_mode && !out.empty())
                     out.push_back(out[0]);
 
-                ctx.sink() << (fill_color == GRB_DARK ? GRB_POL_DARK : GRB_POL_CLEAR) << out;
+                ctx.sink() << ApertureToken() << (fill_color == GRB_DARK ? GRB_POL_DARK : GRB_POL_CLEAR) << out;
             }
         }
     }
@@ -396,7 +422,6 @@ void gerbolyze::SVGDocument::export_svg_path(RenderContext &ctx, const pugi::xml
             ctx.sink() << ApertureToken() << (stroke_color == GRB_DARK ? GRB_POL_DARK : GRB_POL_CLEAR) << s_polys;
         }
     }
-    ctx.sink() << ApertureToken();
 }
 
 void gerbolyze::SVGDocument::render(const RenderSettings &rset, PolygonSink &sink, const ElementSelector &sel) {