public void SignedAreaTest()
{
// arrange
// create a closed polygon (first point is the same as the last)
var points = new VectorTileGeometry(new List <Point>
{
new Point()
{
X = 1, Y = 1
},
new Point()
{
X = 2, Y = 2
},
new Point()
{
X = 3, Y = 1
},
new Point()
{
X = 1, Y = 1
},
});
var polygon = new VectorTilePolygon(points);
// act
var area = polygon.SignedArea();
// assert
// polygon is defined clock-wise so area should be negative
Assert.IsTrue(area == -1);
}
public void TestCCWPolygon()
{
var coords = TestData.GetCCWPolygon(1);
var poly = new VectorTilePolygon(coords);
// act
var ccw = poly.IsCCW();
// assert
Assert.IsTrue(poly.SignedArea() > 0);
Assert.IsTrue(ccw);
}
