public void HollowRectangleValues()
{
// define outline of triangle
double b = 0.5;
double h = 1.0;
double t = 0.1;
var pl1 = new PolyLine3(new List <Point3>
{
new Point3(0, 0, h),
new Point3(0, 0, 0),
new Point3(0, b, 0),
new Point3(0, b, h)
});
var pl2 = new PolyLine3(new List <Point3>
{
new Point3(0, b - t, h - t),
new Point3(0, b - t, 0 + t),
new Point3(0, t, 0 + t),
new Point3(0, t, h - t)
});
double bi = 0.5 - 2 * t;
double hi = 1.0 - 2 * t;
var props = CroSecProperties.solve(new List <PolyLine3> {
pl1, pl2
});
double area_targ = b * h - bi * hi;
Assert.AreEqual(props.A, area_targ, 1E-10);
}
public void RectangleValues()
{
// define outline of triangle
double b = 0.5;
double h = 1.0;
var pl = new PolyLine3(new List <Point3>
{
new Point3(0, 0, h),
new Point3(0, 0, 0),
new Point3(0, b, 0),
new Point3(0, b, h)
});
var props = CroSecProperties.solve(new List <PolyLine3> {
pl
});
double area_targ = b * h;
Assert.AreEqual(props.A, area_targ, 1E-10);
double area_iy = b * h * h * h / 12.0;
Assert.AreEqual(props.inertia.X, area_iy, 1E-10);
Assert.AreEqual(props.inertia_princ.X, area_iy, 1E-10);
double area_iz = h * b * b * b / 12.0;
Assert.AreEqual(props.inertia.Y, area_iz, 1E-10);
Assert.AreEqual(props.inertia_princ.Y, area_iz, 1E-10);
double cog_z = h * 0.5;
double cog_y = b * 0.5;
Assert.AreEqual(props.cog.Y, cog_y, 1E-10);
Assert.AreEqual(props.cog.Z, cog_z, 1E-10);
double wel_y = b * h * h / 6.0;
double wel_z = h * b * b / 6.0;
Assert.AreEqual(props.Welz_y_pos, -wel_z, 1E-10);
Assert.AreEqual(props.Wely_z_pos, wel_y, 1E-10);
Assert.AreEqual(props.Welz_y_neg, wel_z, 1E-10);
Assert.AreEqual(props.Wely_z_neg, -wel_y, 1E-10);
double wpl_y = b * h * h / 4.0;
double wpl_z = h * b * b / 4.0;
Assert.AreEqual(props.Wply, wpl_y, 1E-10);
Assert.AreEqual(props.Wplz, wpl_z, 1E-10);
}