27 lines
1.1 KiB
C++
27 lines
1.1 KiB
C++
#include "catch.hpp"
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#include <mapnik/geometry.hpp>
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#include <mapnik/util/is_clockwise.hpp>
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TEST_CASE("Ring is_clockwise")
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{
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// Input is rather thin triangle to test precision issues aren't getting in the way.
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SECTION("Clockwise")
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{
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mapnik::geometry::linear_ring<double> ring;
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ring.emplace_back(-13499697.0366658326, 4698431.85179749783);
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ring.emplace_back(-13499697.1113113686, 4698431.85179749783);
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ring.emplace_back(-13499697.0366658326, 4698431.92644303292);
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ring.emplace_back(-13499697.0366658326, 4698431.85179749783);
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REQUIRE(mapnik::util::is_clockwise(ring) == true);
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}
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SECTION("Anti-Clockwise")
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{
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mapnik::geometry::linear_ring<double> ring;
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ring.emplace_back(-13499697.0366658326, 4698431.85179749783);
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ring.emplace_back(-13499697.0366658326, 4698431.92644303292);
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ring.emplace_back(-13499697.1113113686, 4698431.85179749783);
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ring.emplace_back(-13499697.0366658326, 4698431.85179749783);
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REQUIRE(mapnik::util::is_clockwise(ring) == false);
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}
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}
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