From 07fa15806fe9f0b31f7baeae0d59aba6ddf3cd7b Mon Sep 17 00:00:00 2001
From: bubnikv <bubnikv@gmail.com>
Date: Thu, 2 Mar 2017 16:32:43 +0100
Subject: Utility function SVG::export_expolygons() to paint a set of possibly
 overlapping ExPolygons with attributes.

---
 xs/src/libslic3r/SVG.cpp | 24 ++++++++++++++++++++++++
 xs/src/libslic3r/SVG.hpp | 28 ++++++++++++++++++++++++++++
 2 files changed, 52 insertions(+)

(limited to 'xs')

diff --git a/xs/src/libslic3r/SVG.cpp b/xs/src/libslic3r/SVG.cpp
index db914ea96..b8580fd5e 100644
--- a/xs/src/libslic3r/SVG.cpp
+++ b/xs/src/libslic3r/SVG.cpp
@@ -345,4 +345,28 @@ void SVG::export_expolygons(const char *path, const BoundingBox &bbox, const Sli
     svg.Close();
 }
 
+void SVG::export_expolygons(const char *path, const std::vector<std::pair<Slic3r::ExPolygons, ExPolygonAttributes>> &expolygons_with_attributes)
+{
+    if (expolygons_with_attributes.empty())
+        return;
+
+    BoundingBox bbox = get_extents(expolygons_with_attributes.front().first);
+    for (size_t i = 0; i < expolygons_with_attributes.size(); ++ i)
+        bbox.merge(get_extents(expolygons_with_attributes[i].first));
+
+    SVG svg(path, bbox);
+    for (const auto &exp_with_attr : expolygons_with_attributes)
+        svg.draw(exp_with_attr.first, exp_with_attr.second.color_fill, exp_with_attr.second.fill_opacity);
+    for (const auto &exp_with_attr : expolygons_with_attributes) {
+        std::string color_contour = exp_with_attr.second.color_contour;
+        if (color_contour.empty())
+            color_contour = exp_with_attr.second.color_fill;
+        std::string color_holes = exp_with_attr.second.color_holes;
+        if (color_holes.empty())
+            color_holes = color_contour;
+        svg.draw_outline(exp_with_attr.first, color_contour, color_holes, exp_with_attr.second.outline_width);
+    }
+    svg.Close();
+}
+
 }
diff --git a/xs/src/libslic3r/SVG.hpp b/xs/src/libslic3r/SVG.hpp
index 3d459804c..3a5602196 100644
--- a/xs/src/libslic3r/SVG.hpp
+++ b/xs/src/libslic3r/SVG.hpp
@@ -93,6 +93,34 @@ public:
         { export_expolygons(path, get_extents(expolygons), expolygons, stroke_outer, stroke_holes, stroke_width); }
     static void export_expolygons(const std::string &path, const Slic3r::ExPolygons &expolygons, std::string stroke_outer = "black", std::string stroke_holes = "blue", coordf_t stroke_width = 0) 
         { export_expolygons(path.c_str(), get_extents(expolygons), expolygons, stroke_outer, stroke_holes, stroke_width); }
+
+    struct ExPolygonAttributes
+    {
+        ExPolygonAttributes() : ExPolygonAttributes("gray", "black", "blue") {}
+        ExPolygonAttributes(const std::string &color) :
+            ExPolygonAttributes(color, color, color) {}
+
+        ExPolygonAttributes(
+            const std::string &color_fill, 
+            const std::string &color_contour,
+            const std::string &color_holes,
+            const coord_t      outline_width = scale_(0.05),
+            const float        fill_opacity  = 0.5f) :
+            color_fill      (color_fill),
+            color_contour   (color_contour),
+            color_holes     (color_holes),
+            outline_width   (outline_width),
+            fill_opacity    (fill_opacity) 
+            {}
+
+        std::string     color_fill;
+        std::string     color_contour;
+        std::string     color_holes;
+        coord_t         outline_width;
+        float           fill_opacity;
+    };
+
+    static void export_expolygons(const char *path, const std::vector<std::pair<Slic3r::ExPolygons, ExPolygonAttributes>> &expolygons_with_attributes);
 };
 
 }
-- 
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