public void Test_Polygon_Centroid()
{
var arr = new IntPoint[4];
arr[0] = new IntPoint(-100, -200);
arr[1] = new IntPoint(100, -200);
arr[2] = new IntPoint(100, 200);
arr[3] = new IntPoint(-100, 200);
var x = 77;
var y = 44;
for (var i = 0; i < arr.Length; ++i)
{
arr[i] = new IntPoint(x + arr[i].X, y + arr[i].Y);
}
var area = PolygonMath.GetClosedPolygonArea(arr);
Assert.AreEqual(80000, area); // counterclockwise should give positive area
var centroid = PolygonMath.GetClosedPolygonCentroid(arr);
Assert.AreEqual(x, centroid.X);
Assert.AreEqual(y, centroid.Y);
}
public void Test_Polygon_Area()
{
var arr = new IntPoint[4];
arr[0] = new IntPoint(-200, -100);
arr[1] = new IntPoint(100, -100);
arr[2] = new IntPoint(100, 100);
arr[3] = new IntPoint(-200, 100);
var area = PolygonMath.GetClosedPolygonArea(arr);
Assert.AreEqual(60000, area); // counterclockwise should give positive area
}