fix line clipping (#54)

mapbox · Jul 26, 2016 · b9df0ca · b9df0ca
1 parent bc730b0
commit b9df0ca
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Showing 3 changed files with 6 additions and 4 deletions.
diff --git a/.mason b/.mason
diff --git a/include/mapbox/geojsonvt/clip.hpp b/include/mapbox/geojsonvt/clip.hpp
@@ -137,8 +137,10 @@ class clipper {
                 } else if (bk > k2) { // |  ---|-->
                     slice.push_back(intersect<I>(a, b, k2));
                     slice = newSlice(slices, slice, dist);
+
+                } else if (i == len - 2) { // | --> |
+                    slice.push_back(b);
                 }
-                // | --> |
             }
         }
 

diff --git a/test/test.cpp b/test/test.cpp
@@ -84,7 +84,7 @@ TEST(Clip, Polylines) {
     const detail::vt_line_string points1{ { 0, 0 },   { 50, 0 },  { 50, 10 }, { 20, 10 },
                                           { 20, 20 }, { 30, 20 }, { 30, 30 }, { 50, 30 },
                                           { 50, 40 }, { 25, 40 }, { 25, 50 }, { 0, 50 },
-                                          { 0, 60 },  { 25, 60 } };
+                                          { 0, 60 },  { 25, 60 }, { 30, 60 } };
 
     const detail::vt_line_string points2{ { 0, 0 }, { 50, 0 }, { 50, 10 }, { 0, 10 } };
 
@@ -97,7 +97,7 @@ TEST(Clip, Polylines) {
         { { 10, 0 }, { 40, 0 } },
         { { 40, 10 }, { 20, 10 }, { 20, 20 }, { 30, 20 }, { 30, 30 }, { 40, 30 } },
         { { 40, 40 }, { 25, 40 }, { 25, 50 }, { 10, 50 } },
-        { { 10, 60 }, { 25, 60 } } } };
+        { { 10, 60 }, { 25, 60 }, { 30, 60 } } } };
 
     const detail::vt_geometry expected2{ detail::vt_multi_line_string{
         { { 10, 0 }, { 40, 0 } }, { { 40, 10 }, { 10, 10 } } } };